Moved projection list to using chapter and created a list of transformations. Both are grouped in a section called operations.

280 files changed, 156 insertions, 12 deletions

diff --git a/docs/source/index.rst b/docs/source/index.rst
index bfb9aee6..324d52fc 100644
--- a/docs/source/index.rst
+++ b/docs/source/index.rst
@@ -35,7 +35,6 @@ Documentation
    :maxdepth: 1
 
    usage/index
-   projections/index
    geodesic
    grids
    htpd
diff --git a/docs/source/usage/index.rst b/docs/source/usage/index.rst
index 8c12c026..5979426a 100644
--- a/docs/source/usage/index.rst
+++ b/docs/source/usage/index.rst
@@ -17,4 +17,5 @@ command line applications or the C API that is a part of the software package.
    projections
    transformation
    resource_files
+   operations/index
 
diff --git a/docs/source/usage/operations/index.rst b/docs/source/usage/operations/index.rst
new file mode 100644
index 00000000..21200c93
--- /dev/null
+++ b/docs/source/usage/operations/index.rst
@@ -0,0 +1,18 @@
+.. _operations:
+
+================================================================================
+Coordinate operations
+================================================================================
+
+Coordinate operations in PROJ.4 are divided into two groups:
+Projections and transformations.
+Projections are purely cartographic mappings of the sphere onto the plane whereas
+transformations are mostly geodetic operations concerned with changes in
+reference frames.
+
+.. toctree::
+   :maxdepth: 1
+
+   projections/index
+   transformations/index
+
diff --git a/docs/source/projections/aeqd.rst b/docs/source/usage/operations/projections/aeqd.rst
index 949cd8a0..949cd8a0 100644
--- a/docs/source/projections/aeqd.rst
+++ b/docs/source/usage/operations/projections/aeqd.rst
diff --git a/docs/source/projections/airy.rst b/docs/source/usage/operations/projections/airy.rst
index 307af3e3..307af3e3 100644
--- a/docs/source/projections/airy.rst
+++ b/docs/source/usage/operations/projections/airy.rst
diff --git a/docs/source/projections/aitoff.rst b/docs/source/usage/operations/projections/aitoff.rst
index 4d681468..4d681468 100644
--- a/docs/source/projections/aitoff.rst
+++ b/docs/source/usage/operations/projections/aitoff.rst
diff --git a/docs/source/projections/alsk.rst b/docs/source/usage/operations/projections/alsk.rst
index f7a7a0ef..f7a7a0ef 100644
--- a/docs/source/projections/alsk.rst
+++ b/docs/source/usage/operations/projections/alsk.rst
diff --git a/docs/source/projections/apian.rst b/docs/source/usage/operations/projections/apian.rst
index add501ea..add501ea 100644
--- a/docs/source/projections/apian.rst
+++ b/docs/source/usage/operations/projections/apian.rst
diff --git a/docs/source/projections/august.rst b/docs/source/usage/operations/projections/august.rst
index e2ad3516..e2ad3516 100644
--- a/docs/source/projections/august.rst
+++ b/docs/source/usage/operations/projections/august.rst
diff --git a/docs/source/projections/bacon.rst b/docs/source/usage/operations/projections/bacon.rst
index a87ea7d8..a87ea7d8 100644
--- a/docs/source/projections/bacon.rst
+++ b/docs/source/usage/operations/projections/bacon.rst
diff --git a/docs/source/projections/bipc.rst b/docs/source/usage/operations/projections/bipc.rst
index 7045f04a..7045f04a 100644
--- a/docs/source/projections/bipc.rst
+++ b/docs/source/usage/operations/projections/bipc.rst
diff --git a/docs/source/projections/boggs.rst b/docs/source/usage/operations/projections/boggs.rst
index 1dd7d19f..1dd7d19f 100644
--- a/docs/source/projections/boggs.rst
+++ b/docs/source/usage/operations/projections/boggs.rst
diff --git a/docs/source/projections/bonne.rst b/docs/source/usage/operations/projections/bonne.rst
index ef87d7c9..ef87d7c9 100644
--- a/docs/source/projections/bonne.rst
+++ b/docs/source/usage/operations/projections/bonne.rst
diff --git a/docs/source/projections/calcofi.rst b/docs/source/usage/operations/projections/calcofi.rst
index 3c1e5f7a..650416c1 100644
--- a/docs/source/projections/calcofi.rst
+++ b/docs/source/usage/operations/projections/calcofi.rst
@@ -22,7 +22,7 @@ California Cooperative Oceanic Fisheries Investigations program, known as CalCOF
 +---------------------+----------------------------------------------------------+
 
 
-.. image:: ../../images/calcofi.png
+.. image:: ../../../../images/calcofi.png
    :scale: 50%
    :align: center
    :alt:   Cal Coop Ocean Fish Invest Lines/Stations
diff --git a/docs/source/projections/cass.rst b/docs/source/usage/operations/projections/cass.rst
index 83f8c2ce..83f8c2ce 100644
--- a/docs/source/projections/cass.rst
+++ b/docs/source/usage/operations/projections/cass.rst
diff --git a/docs/source/projections/cc.rst b/docs/source/usage/operations/projections/cc.rst
index 5b30e6c6..5b30e6c6 100644
--- a/docs/source/projections/cc.rst
+++ b/docs/source/usage/operations/projections/cc.rst
diff --git a/docs/source/projections/cea.rst b/docs/source/usage/operations/projections/cea.rst
index 20ebc285..20ebc285 100644
--- a/docs/source/projections/cea.rst
+++ b/docs/source/usage/operations/projections/cea.rst
diff --git a/docs/source/projections/chamb.rst b/docs/source/usage/operations/projections/chamb.rst
index 2ec9bffe..2ec9bffe 100644
--- a/docs/source/projections/chamb.rst
+++ b/docs/source/usage/operations/projections/chamb.rst
diff --git a/docs/source/projections/collg.rst b/docs/source/usage/operations/projections/collg.rst
index aa16182a..aa16182a 100644
--- a/docs/source/projections/collg.rst
+++ b/docs/source/usage/operations/projections/collg.rst
diff --git a/docs/source/projections/crast.rst b/docs/source/usage/operations/projections/crast.rst
index 9d17f274..9d17f274 100644
--- a/docs/source/projections/crast.rst
+++ b/docs/source/usage/operations/projections/crast.rst
diff --git a/docs/source/projections/denoy.rst b/docs/source/usage/operations/projections/denoy.rst
index a885ab0e..a885ab0e 100644
--- a/docs/source/projections/denoy.rst
+++ b/docs/source/usage/operations/projections/denoy.rst
diff --git a/docs/source/projections/eck1.rst b/docs/source/usage/operations/projections/eck1.rst
index 841533ec..841533ec 100644
--- a/docs/source/projections/eck1.rst
+++ b/docs/source/usage/operations/projections/eck1.rst
diff --git a/docs/source/projections/eck2.rst b/docs/source/usage/operations/projections/eck2.rst
index b1bd3179..b1bd3179 100644
--- a/docs/source/projections/eck2.rst
+++ b/docs/source/usage/operations/projections/eck2.rst
diff --git a/docs/source/projections/eck3.rst b/docs/source/usage/operations/projections/eck3.rst
index ecacc32d..ecacc32d 100644
--- a/docs/source/projections/eck3.rst
+++ b/docs/source/usage/operations/projections/eck3.rst
diff --git a/docs/source/projections/eck4.rst b/docs/source/usage/operations/projections/eck4.rst
index 3fc6a9fd..3fc6a9fd 100644
--- a/docs/source/projections/eck4.rst
+++ b/docs/source/usage/operations/projections/eck4.rst
diff --git a/docs/source/projections/eck5.rst b/docs/source/usage/operations/projections/eck5.rst
index 1442d99d..1442d99d 100644
--- a/docs/source/projections/eck5.rst
+++ b/docs/source/usage/operations/projections/eck5.rst
diff --git a/docs/source/projections/eck6.rst b/docs/source/usage/operations/projections/eck6.rst
index caeaefa6..caeaefa6 100644
--- a/docs/source/projections/eck6.rst
+++ b/docs/source/usage/operations/projections/eck6.rst
diff --git a/docs/source/projections/eqc.rst b/docs/source/usage/operations/projections/eqc.rst
index be431977..be431977 100644
--- a/docs/source/projections/eqc.rst
+++ b/docs/source/usage/operations/projections/eqc.rst
diff --git a/docs/source/projections/eqdc.rst b/docs/source/usage/operations/projections/eqdc.rst
index 3ee5999d..3ee5999d 100644
--- a/docs/source/projections/eqdc.rst
+++ b/docs/source/usage/operations/projections/eqdc.rst
diff --git a/docs/source/projections/etmerc.rst b/docs/source/usage/operations/projections/etmerc.rst
index b7f89032..b7f89032 100644
--- a/docs/source/projections/etmerc.rst
+++ b/docs/source/usage/operations/projections/etmerc.rst
diff --git a/docs/source/projections/euler.rst b/docs/source/usage/operations/projections/euler.rst
index e495063f..e495063f 100644
--- a/docs/source/projections/euler.rst
+++ b/docs/source/usage/operations/projections/euler.rst
diff --git a/docs/source/projections/fahey.rst b/docs/source/usage/operations/projections/fahey.rst
index 2e09337f..2e09337f 100644
--- a/docs/source/projections/fahey.rst
+++ b/docs/source/usage/operations/projections/fahey.rst
diff --git a/docs/source/projections/fouc.rst b/docs/source/usage/operations/projections/fouc.rst
index 7467dcb1..7467dcb1 100644
--- a/docs/source/projections/fouc.rst
+++ b/docs/source/usage/operations/projections/fouc.rst
diff --git a/docs/source/projections/fouc_s.rst b/docs/source/usage/operations/projections/fouc_s.rst
index ac353adb..ac353adb 100644
--- a/docs/source/projections/fouc_s.rst
+++ b/docs/source/usage/operations/projections/fouc_s.rst
diff --git a/docs/source/projections/gall.rst b/docs/source/usage/operations/projections/gall.rst
index b9120d9f..b9120d9f 100644
--- a/docs/source/projections/gall.rst
+++ b/docs/source/usage/operations/projections/gall.rst
diff --git a/docs/source/projections/geos.rst b/docs/source/usage/operations/projections/geos.rst
index 56550159..3b24e1f7 100644
--- a/docs/source/projections/geos.rst
+++ b/docs/source/usage/operations/projections/geos.rst
@@ -55,7 +55,7 @@ projection have a two-axis gimbal viewing geometry. This means that the differen
 scanning positions are obtained by rotating the gimbal along a N/S axis (or ``y``)
 and a E/W axis (or ``x``).
 
-.. image:: ../../images/geos_sweep.png
+.. image:: ../../../../images/geos_sweep.png
    :scale: 50%
    :alt:   Gimbal geometry
 
diff --git a/docs/source/projections/gins8.rst b/docs/source/usage/operations/projections/gins8.rst
index f6adb092..f6adb092 100644
--- a/docs/source/projections/gins8.rst
+++ b/docs/source/usage/operations/projections/gins8.rst
diff --git a/docs/source/projections/gn_sinu.rst b/docs/source/usage/operations/projections/gn_sinu.rst
index c1017c27..c1017c27 100644
--- a/docs/source/projections/gn_sinu.rst
+++ b/docs/source/usage/operations/projections/gn_sinu.rst
diff --git a/docs/source/projections/gnom.rst b/docs/source/usage/operations/projections/gnom.rst
index 08d0db5f..08d0db5f 100644
--- a/docs/source/projections/gnom.rst
+++ b/docs/source/usage/operations/projections/gnom.rst
diff --git a/docs/source/projections/goode.rst b/docs/source/usage/operations/projections/goode.rst
index c4590bf2..c4590bf2 100644
--- a/docs/source/projections/goode.rst
+++ b/docs/source/usage/operations/projections/goode.rst
diff --git a/docs/source/projections/gs48.rst b/docs/source/usage/operations/projections/gs48.rst
index bdaa367c..bdaa367c 100644
--- a/docs/source/projections/gs48.rst
+++ b/docs/source/usage/operations/projections/gs48.rst
diff --git a/docs/source/projections/gs50.rst b/docs/source/usage/operations/projections/gs50.rst
index 0d4b7e81..0d4b7e81 100644
--- a/docs/source/projections/gs50.rst
+++ b/docs/source/usage/operations/projections/gs50.rst
diff --git a/docs/source/projections/gstmerc.rst b/docs/source/usage/operations/projections/gstmerc.rst
index fc587ab0..fc587ab0 100644
--- a/docs/source/projections/gstmerc.rst
+++ b/docs/source/usage/operations/projections/gstmerc.rst
diff --git a/docs/source/projections/hammer.rst b/docs/source/usage/operations/projections/hammer.rst
index e795b91b..e795b91b 100644
--- a/docs/source/projections/hammer.rst
+++ b/docs/source/usage/operations/projections/hammer.rst
diff --git a/docs/source/projections/hatano.rst b/docs/source/usage/operations/projections/hatano.rst
index 5d0c63b7..5d0c63b7 100644
--- a/docs/source/projections/hatano.rst
+++ b/docs/source/usage/operations/projections/hatano.rst
diff --git a/docs/source/projections/healpix.rst b/docs/source/usage/operations/projections/healpix.rst
index 885ea3ea..20815d76 100644
--- a/docs/source/projections/healpix.rst
+++ b/docs/source/usage/operations/projections/healpix.rst
@@ -17,7 +17,7 @@ HEALPix
 | `No special options for this projection`                                       |
 +---------------------+----------------------------------------------------------+
 
-.. image:: ../../images/healpix.png
+.. image:: ../../../../images/healpix.png
    :scale: 75%
    :alt:   HEALPix
 
diff --git a/docs/source/projections/igh.rst b/docs/source/usage/operations/projections/igh.rst
index d74e1362..d74e1362 100644
--- a/docs/source/projections/igh.rst
+++ b/docs/source/usage/operations/projections/igh.rst
diff --git a/docs/source/projections/images/aea.png b/docs/source/usage/operations/projections/images/aea.png
index 7fdd4ece..7fdd4ece 100644
--- a/docs/source/projections/images/aea.png
+++ b/docs/source/usage/operations/projections/images/aea.png
diff --git a/docs/source/projections/images/aeqd.png b/docs/source/usage/operations/projections/images/aeqd.png
index 8e45b2c0..8e45b2c0 100644
--- a/docs/source/projections/images/aeqd.png
+++ b/docs/source/usage/operations/projections/images/aeqd.png
diff --git a/docs/source/projections/images/airy.png b/docs/source/usage/operations/projections/images/airy.png
index a441e317..a441e317 100644
--- a/docs/source/projections/images/airy.png
+++ b/docs/source/usage/operations/projections/images/airy.png
diff --git a/docs/source/projections/images/aitoff.png b/docs/source/usage/operations/projections/images/aitoff.png
index 3449dcd5..3449dcd5 100644
--- a/docs/source/projections/images/aitoff.png
+++ b/docs/source/usage/operations/projections/images/aitoff.png
diff --git a/docs/source/projections/images/alsk.png b/docs/source/usage/operations/projections/images/alsk.png
index 6f6e2014..6f6e2014 100644
--- a/docs/source/projections/images/alsk.png
+++ b/docs/source/usage/operations/projections/images/alsk.png
diff --git a/docs/source/projections/images/apian.png b/docs/source/usage/operations/projections/images/apian.png
index 95857ae3..95857ae3 100644
--- a/docs/source/projections/images/apian.png
+++ b/docs/source/usage/operations/projections/images/apian.png
diff --git a/docs/source/projections/images/august.png b/docs/source/usage/operations/projections/images/august.png
index 9d9fece6..9d9fece6 100644
--- a/docs/source/projections/images/august.png
+++ b/docs/source/usage/operations/projections/images/august.png
diff --git a/docs/source/projections/images/bacon.png b/docs/source/usage/operations/projections/images/bacon.png
index 62deae63..62deae63 100644
--- a/docs/source/projections/images/bacon.png
+++ b/docs/source/usage/operations/projections/images/bacon.png
diff --git a/docs/source/projections/images/bipc.png b/docs/source/usage/operations/projections/images/bipc.png
index 7b8ab39c..7b8ab39c 100644
--- a/docs/source/projections/images/bipc.png
+++ b/docs/source/usage/operations/projections/images/bipc.png
diff --git a/docs/source/projections/images/boggs.png b/docs/source/usage/operations/projections/images/boggs.png
index 42dd4c13..42dd4c13 100644
--- a/docs/source/projections/images/boggs.png
+++ b/docs/source/usage/operations/projections/images/boggs.png
diff --git a/docs/source/projections/images/bonne.png b/docs/source/usage/operations/projections/images/bonne.png
index 12f93217..12f93217 100644
--- a/docs/source/projections/images/bonne.png
+++ b/docs/source/usage/operations/projections/images/bonne.png
diff --git a/docs/source/projections/images/calcofi.png b/docs/source/usage/operations/projections/images/calcofi.png
index 2fd405ac..2fd405ac 100644
--- a/docs/source/projections/images/calcofi.png
+++ b/docs/source/usage/operations/projections/images/calcofi.png
diff --git a/docs/source/projections/images/cass.png b/docs/source/usage/operations/projections/images/cass.png
index e44c46af..e44c46af 100644
--- a/docs/source/projections/images/cass.png
+++ b/docs/source/usage/operations/projections/images/cass.png
diff --git a/docs/source/projections/images/cc.png b/docs/source/usage/operations/projections/images/cc.png
index 3beaedfd..3beaedfd 100644
--- a/docs/source/projections/images/cc.png
+++ b/docs/source/usage/operations/projections/images/cc.png
diff --git a/docs/source/projections/images/cea.png b/docs/source/usage/operations/projections/images/cea.png
index eca2319d..eca2319d 100644
--- a/docs/source/projections/images/cea.png
+++ b/docs/source/usage/operations/projections/images/cea.png
diff --git a/docs/source/projections/images/chamb.png b/docs/source/usage/operations/projections/images/chamb.png
index a87e6c68..a87e6c68 100644
--- a/docs/source/projections/images/chamb.png
+++ b/docs/source/usage/operations/projections/images/chamb.png
diff --git a/docs/source/projections/images/collg.png b/docs/source/usage/operations/projections/images/collg.png
index 851201da..851201da 100644
--- a/docs/source/projections/images/collg.png
+++ b/docs/source/usage/operations/projections/images/collg.png
diff --git a/docs/source/projections/images/comill.png b/docs/source/usage/operations/projections/images/comill.png
index 725a0118..725a0118 100644
--- a/docs/source/projections/images/comill.png
+++ b/docs/source/usage/operations/projections/images/comill.png
diff --git a/docs/source/projections/images/crast.png b/docs/source/usage/operations/projections/images/crast.png
index abd4d32a..abd4d32a 100644
--- a/docs/source/projections/images/crast.png
+++ b/docs/source/usage/operations/projections/images/crast.png
diff --git a/docs/source/projections/images/denoy.png b/docs/source/usage/operations/projections/images/denoy.png
index 2871cf84..2871cf84 100644
--- a/docs/source/projections/images/denoy.png
+++ b/docs/source/usage/operations/projections/images/denoy.png
diff --git a/docs/source/projections/images/eck1.png b/docs/source/usage/operations/projections/images/eck1.png
index b892d39e..b892d39e 100644
--- a/docs/source/projections/images/eck1.png
+++ b/docs/source/usage/operations/projections/images/eck1.png
diff --git a/docs/source/projections/images/eck2.png b/docs/source/usage/operations/projections/images/eck2.png
index ff011598..ff011598 100644
--- a/docs/source/projections/images/eck2.png
+++ b/docs/source/usage/operations/projections/images/eck2.png
diff --git a/docs/source/projections/images/eck3.png b/docs/source/usage/operations/projections/images/eck3.png
index f828eed0..f828eed0 100644
--- a/docs/source/projections/images/eck3.png
+++ b/docs/source/usage/operations/projections/images/eck3.png
diff --git a/docs/source/projections/images/eck4.png b/docs/source/usage/operations/projections/images/eck4.png
index d7ff87bb..d7ff87bb 100644
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+++ b/docs/source/usage/operations/projections/images/eck4.png
diff --git a/docs/source/projections/images/eck5.png b/docs/source/usage/operations/projections/images/eck5.png
index 3df303c6..3df303c6 100644
--- a/docs/source/projections/images/eck5.png
+++ b/docs/source/usage/operations/projections/images/eck5.png
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index d22f4956..d22f4956 100644
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+++ b/docs/source/usage/operations/projections/images/eck6.png
diff --git a/docs/source/projections/images/eqc.png b/docs/source/usage/operations/projections/images/eqc.png
index b2d8ba23..b2d8ba23 100644
--- a/docs/source/projections/images/eqc.png
+++ b/docs/source/usage/operations/projections/images/eqc.png
diff --git a/docs/source/projections/images/eqdc.png b/docs/source/usage/operations/projections/images/eqdc.png
index f2330a8e..f2330a8e 100644
--- a/docs/source/projections/images/eqdc.png
+++ b/docs/source/usage/operations/projections/images/eqdc.png
diff --git a/docs/source/projections/images/etmerc.png b/docs/source/usage/operations/projections/images/etmerc.png
index 8e6bb39b..8e6bb39b 100644
--- a/docs/source/projections/images/etmerc.png
+++ b/docs/source/usage/operations/projections/images/etmerc.png
diff --git a/docs/source/projections/images/euler.png b/docs/source/usage/operations/projections/images/euler.png
index c9c6e4c8..c9c6e4c8 100644
--- a/docs/source/projections/images/euler.png
+++ b/docs/source/usage/operations/projections/images/euler.png
diff --git a/docs/source/projections/images/fahey.png b/docs/source/usage/operations/projections/images/fahey.png
index 8b870b8a..8b870b8a 100644
--- a/docs/source/projections/images/fahey.png
+++ b/docs/source/usage/operations/projections/images/fahey.png
diff --git a/docs/source/projections/images/fouc.png b/docs/source/usage/operations/projections/images/fouc.png
index 6d33216b..6d33216b 100644
--- a/docs/source/projections/images/fouc.png
+++ b/docs/source/usage/operations/projections/images/fouc.png
diff --git a/docs/source/projections/images/fouc_s.png b/docs/source/usage/operations/projections/images/fouc_s.png
index 401f5ee4..401f5ee4 100644
--- a/docs/source/projections/images/fouc_s.png
+++ b/docs/source/usage/operations/projections/images/fouc_s.png
diff --git a/docs/source/projections/images/gall.png b/docs/source/usage/operations/projections/images/gall.png
index 819b5d12..819b5d12 100644
--- a/docs/source/projections/images/gall.png
+++ b/docs/source/usage/operations/projections/images/gall.png
diff --git a/docs/source/projections/images/geos.png b/docs/source/usage/operations/projections/images/geos.png
index e44fa41b..e44fa41b 100644
--- a/docs/source/projections/images/geos.png
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+++ b/docs/source/usage/operations/projections/images/urm5.png
diff --git a/docs/source/projections/images/urmfps.png b/docs/source/usage/operations/projections/images/urmfps.png
index 86432790..86432790 100644
--- a/docs/source/projections/images/urmfps.png
+++ b/docs/source/usage/operations/projections/images/urmfps.png
diff --git a/docs/source/projections/images/utm.png b/docs/source/usage/operations/projections/images/utm.png
index 3dcd5ee0..3dcd5ee0 100644
--- a/docs/source/projections/images/utm.png
+++ b/docs/source/usage/operations/projections/images/utm.png
diff --git a/docs/source/projections/images/vandg.png b/docs/source/usage/operations/projections/images/vandg.png
index 46fe2346..46fe2346 100644
--- a/docs/source/projections/images/vandg.png
+++ b/docs/source/usage/operations/projections/images/vandg.png
diff --git a/docs/source/projections/images/vandg2.png b/docs/source/usage/operations/projections/images/vandg2.png
index 597b5ae1..597b5ae1 100644
--- a/docs/source/projections/images/vandg2.png
+++ b/docs/source/usage/operations/projections/images/vandg2.png
diff --git a/docs/source/projections/images/vandg3.png b/docs/source/usage/operations/projections/images/vandg3.png
index 36d1ad04..36d1ad04 100644
--- a/docs/source/projections/images/vandg3.png
+++ b/docs/source/usage/operations/projections/images/vandg3.png
diff --git a/docs/source/projections/images/vandg4.png b/docs/source/usage/operations/projections/images/vandg4.png
index 163c1558..163c1558 100644
--- a/docs/source/projections/images/vandg4.png
+++ b/docs/source/usage/operations/projections/images/vandg4.png
diff --git a/docs/source/projections/images/vitk1.png b/docs/source/usage/operations/projections/images/vitk1.png
index 31034b3a..31034b3a 100644
--- a/docs/source/projections/images/vitk1.png
+++ b/docs/source/usage/operations/projections/images/vitk1.png
diff --git a/docs/source/projections/images/wag1.png b/docs/source/usage/operations/projections/images/wag1.png
index a2bc8adc..a2bc8adc 100644
--- a/docs/source/projections/images/wag1.png
+++ b/docs/source/usage/operations/projections/images/wag1.png
diff --git a/docs/source/projections/images/wag2.png b/docs/source/usage/operations/projections/images/wag2.png
index b4abb48c..b4abb48c 100644
--- a/docs/source/projections/images/wag2.png
+++ b/docs/source/usage/operations/projections/images/wag2.png
diff --git a/docs/source/projections/images/wag3.png b/docs/source/usage/operations/projections/images/wag3.png
index a2053815..a2053815 100644
--- a/docs/source/projections/images/wag3.png
+++ b/docs/source/usage/operations/projections/images/wag3.png
diff --git a/docs/source/projections/images/wag4.png b/docs/source/usage/operations/projections/images/wag4.png
index 7d1c50b3..7d1c50b3 100644
--- a/docs/source/projections/images/wag4.png
+++ b/docs/source/usage/operations/projections/images/wag4.png
diff --git a/docs/source/projections/images/wag5.png b/docs/source/usage/operations/projections/images/wag5.png
index 487f6022..487f6022 100644
--- a/docs/source/projections/images/wag5.png
+++ b/docs/source/usage/operations/projections/images/wag5.png
diff --git a/docs/source/projections/images/wag6.png b/docs/source/usage/operations/projections/images/wag6.png
index dd49e8d0..dd49e8d0 100644
--- a/docs/source/projections/images/wag6.png
+++ b/docs/source/usage/operations/projections/images/wag6.png
diff --git a/docs/source/projections/images/wag7.png b/docs/source/usage/operations/projections/images/wag7.png
index b9682755..b9682755 100644
--- a/docs/source/projections/images/wag7.png
+++ b/docs/source/usage/operations/projections/images/wag7.png
diff --git a/docs/source/projections/images/weren.png b/docs/source/usage/operations/projections/images/weren.png
index 7deb132f..7deb132f 100644
--- a/docs/source/projections/images/weren.png
+++ b/docs/source/usage/operations/projections/images/weren.png
diff --git a/docs/source/projections/images/wink1.png b/docs/source/usage/operations/projections/images/wink1.png
index 6cbf48ae..6cbf48ae 100644
--- a/docs/source/projections/images/wink1.png
+++ b/docs/source/usage/operations/projections/images/wink1.png
diff --git a/docs/source/projections/images/wink2.png b/docs/source/usage/operations/projections/images/wink2.png
index 21a23634..21a23634 100644
--- a/docs/source/projections/images/wink2.png
+++ b/docs/source/usage/operations/projections/images/wink2.png
diff --git a/docs/source/projections/images/wintri.png b/docs/source/usage/operations/projections/images/wintri.png
index 54a0a85a..54a0a85a 100644
--- a/docs/source/projections/images/wintri.png
+++ b/docs/source/usage/operations/projections/images/wintri.png
diff --git a/docs/source/projections/imw_p.rst b/docs/source/usage/operations/projections/imw_p.rst
index 1fd3ded0..1fd3ded0 100644
--- a/docs/source/projections/imw_p.rst
+++ b/docs/source/usage/operations/projections/imw_p.rst
diff --git a/docs/source/projections/index.rst b/docs/source/usage/operations/projections/index.rst
index ae8ef1ee..ae8ef1ee 100644
--- a/docs/source/projections/index.rst
+++ b/docs/source/usage/operations/projections/index.rst
diff --git a/docs/source/projections/isea.rst b/docs/source/usage/operations/projections/isea.rst
index 1b6457af..1b6457af 100644
--- a/docs/source/projections/isea.rst
+++ b/docs/source/usage/operations/projections/isea.rst
diff --git a/docs/source/projections/kav5.rst b/docs/source/usage/operations/projections/kav5.rst
index 2ec5d1c1..2ec5d1c1 100644
--- a/docs/source/projections/kav5.rst
+++ b/docs/source/usage/operations/projections/kav5.rst
diff --git a/docs/source/projections/kav7.rst b/docs/source/usage/operations/projections/kav7.rst
index 8371e6ea..8371e6ea 100644
--- a/docs/source/projections/kav7.rst
+++ b/docs/source/usage/operations/projections/kav7.rst
diff --git a/docs/source/projections/krovak.rst b/docs/source/usage/operations/projections/krovak.rst
index 6c774825..6c774825 100644
--- a/docs/source/projections/krovak.rst
+++ b/docs/source/usage/operations/projections/krovak.rst
diff --git a/docs/source/projections/labrd.rst b/docs/source/usage/operations/projections/labrd.rst
index 5be58db5..5be58db5 100644
--- a/docs/source/projections/labrd.rst
+++ b/docs/source/usage/operations/projections/labrd.rst
diff --git a/docs/source/projections/laea.rst b/docs/source/usage/operations/projections/laea.rst
index 2377f294..2377f294 100644
--- a/docs/source/projections/laea.rst
+++ b/docs/source/usage/operations/projections/laea.rst
diff --git a/docs/source/projections/lagrng.rst b/docs/source/usage/operations/projections/lagrng.rst
index de9e5640..de9e5640 100644
--- a/docs/source/projections/lagrng.rst
+++ b/docs/source/usage/operations/projections/lagrng.rst
diff --git a/docs/source/projections/larr.rst b/docs/source/usage/operations/projections/larr.rst
index 9529f83f..9529f83f 100644
--- a/docs/source/projections/larr.rst
+++ b/docs/source/usage/operations/projections/larr.rst
diff --git a/docs/source/projections/lask.rst b/docs/source/usage/operations/projections/lask.rst
index d34dc8a0..d34dc8a0 100644
--- a/docs/source/projections/lask.rst
+++ b/docs/source/usage/operations/projections/lask.rst
diff --git a/docs/source/projections/latlon.rst b/docs/source/usage/operations/projections/latlon.rst
index 6712fa7b..6712fa7b 100644
--- a/docs/source/projections/latlon.rst
+++ b/docs/source/usage/operations/projections/latlon.rst
diff --git a/docs/source/projections/lcc.rst b/docs/source/usage/operations/projections/lcc.rst
index a3075e76..a3075e76 100644
--- a/docs/source/projections/lcc.rst
+++ b/docs/source/usage/operations/projections/lcc.rst
diff --git a/docs/source/projections/lcca.rst b/docs/source/usage/operations/projections/lcca.rst
index ca87e67e..ca87e67e 100644
--- a/docs/source/projections/lcca.rst
+++ b/docs/source/usage/operations/projections/lcca.rst
diff --git a/docs/source/projections/leac.rst b/docs/source/usage/operations/projections/leac.rst
index 2957798e..2957798e 100644
--- a/docs/source/projections/leac.rst
+++ b/docs/source/usage/operations/projections/leac.rst
diff --git a/docs/source/projections/lee_os.rst b/docs/source/usage/operations/projections/lee_os.rst
index 711dc754..711dc754 100644
--- a/docs/source/projections/lee_os.rst
+++ b/docs/source/usage/operations/projections/lee_os.rst
diff --git a/docs/source/projections/lonlat.rst b/docs/source/usage/operations/projections/lonlat.rst
index 589cc813..589cc813 100644
--- a/docs/source/projections/lonlat.rst
+++ b/docs/source/usage/operations/projections/lonlat.rst
diff --git a/docs/source/projections/loxim.rst b/docs/source/usage/operations/projections/loxim.rst
index e50ba472..e50ba472 100644
--- a/docs/source/projections/loxim.rst
+++ b/docs/source/usage/operations/projections/loxim.rst
diff --git a/docs/source/projections/lsat.rst b/docs/source/usage/operations/projections/lsat.rst
index fb64bdb2..fb64bdb2 100644
--- a/docs/source/projections/lsat.rst
+++ b/docs/source/usage/operations/projections/lsat.rst
diff --git a/docs/source/projections/mbt_fps.rst b/docs/source/usage/operations/projections/mbt_fps.rst
index 55ebcf6c..55ebcf6c 100644
--- a/docs/source/projections/mbt_fps.rst
+++ b/docs/source/usage/operations/projections/mbt_fps.rst
diff --git a/docs/source/projections/mbt_s.rst b/docs/source/usage/operations/projections/mbt_s.rst
index 9a355ec8..9a355ec8 100644
--- a/docs/source/projections/mbt_s.rst
+++ b/docs/source/usage/operations/projections/mbt_s.rst
diff --git a/docs/source/projections/mbtfpp.rst b/docs/source/usage/operations/projections/mbtfpp.rst
index 9be309d9..9be309d9 100644
--- a/docs/source/projections/mbtfpp.rst
+++ b/docs/source/usage/operations/projections/mbtfpp.rst
diff --git a/docs/source/projections/mbtfpq.rst b/docs/source/usage/operations/projections/mbtfpq.rst
index 295e814d..295e814d 100644
--- a/docs/source/projections/mbtfpq.rst
+++ b/docs/source/usage/operations/projections/mbtfpq.rst
diff --git a/docs/source/projections/mbtfps.rst b/docs/source/usage/operations/projections/mbtfps.rst
index b9365361..b9365361 100644
--- a/docs/source/projections/mbtfps.rst
+++ b/docs/source/usage/operations/projections/mbtfps.rst
diff --git a/docs/source/projections/merc.rst b/docs/source/usage/operations/projections/merc.rst
index 64ba98a4..64ba98a4 100644
--- a/docs/source/projections/merc.rst
+++ b/docs/source/usage/operations/projections/merc.rst
diff --git a/docs/source/projections/mil_os.rst b/docs/source/usage/operations/projections/mil_os.rst
index 5547e43c..5547e43c 100644
--- a/docs/source/projections/mil_os.rst
+++ b/docs/source/usage/operations/projections/mil_os.rst
diff --git a/docs/source/projections/mill.rst b/docs/source/usage/operations/projections/mill.rst
index eb9c2092..eb9c2092 100644
--- a/docs/source/projections/mill.rst
+++ b/docs/source/usage/operations/projections/mill.rst
diff --git a/docs/source/projections/moll.rst b/docs/source/usage/operations/projections/moll.rst
index 1bd3d005..1bd3d005 100644
--- a/docs/source/projections/moll.rst
+++ b/docs/source/usage/operations/projections/moll.rst
diff --git a/docs/source/projections/murd1.rst b/docs/source/usage/operations/projections/murd1.rst
index 71cbf155..71cbf155 100644
--- a/docs/source/projections/murd1.rst
+++ b/docs/source/usage/operations/projections/murd1.rst
diff --git a/docs/source/projections/murd2.rst b/docs/source/usage/operations/projections/murd2.rst
index b55cde35..b55cde35 100644
--- a/docs/source/projections/murd2.rst
+++ b/docs/source/usage/operations/projections/murd2.rst
diff --git a/docs/source/projections/murd3.rst b/docs/source/usage/operations/projections/murd3.rst
index 70cc9276..70cc9276 100644
--- a/docs/source/projections/murd3.rst
+++ b/docs/source/usage/operations/projections/murd3.rst
diff --git a/docs/source/projections/natearth.rst b/docs/source/usage/operations/projections/natearth.rst
index 57dd96db..57dd96db 100644
--- a/docs/source/projections/natearth.rst
+++ b/docs/source/usage/operations/projections/natearth.rst
diff --git a/docs/source/projections/nell.rst b/docs/source/usage/operations/projections/nell.rst
index c6a3771c..c6a3771c 100644
--- a/docs/source/projections/nell.rst
+++ b/docs/source/usage/operations/projections/nell.rst
diff --git a/docs/source/projections/nell_h.rst b/docs/source/usage/operations/projections/nell_h.rst
index 6a3b26ba..6a3b26ba 100644
--- a/docs/source/projections/nell_h.rst
+++ b/docs/source/usage/operations/projections/nell_h.rst
diff --git a/docs/source/projections/nicol.rst b/docs/source/usage/operations/projections/nicol.rst
index 995cedb5..995cedb5 100644
--- a/docs/source/projections/nicol.rst
+++ b/docs/source/usage/operations/projections/nicol.rst
diff --git a/docs/source/projections/nsper.rst b/docs/source/usage/operations/projections/nsper.rst
index 4a8651fc..4a8651fc 100644
--- a/docs/source/projections/nsper.rst
+++ b/docs/source/usage/operations/projections/nsper.rst
diff --git a/docs/source/projections/nzmg.rst b/docs/source/usage/operations/projections/nzmg.rst
index 926655d8..926655d8 100644
--- a/docs/source/projections/nzmg.rst
+++ b/docs/source/usage/operations/projections/nzmg.rst
diff --git a/docs/source/projections/ob_tran.rst b/docs/source/usage/operations/projections/ob_tran.rst
index 3c996336..3c996336 100644
--- a/docs/source/projections/ob_tran.rst
+++ b/docs/source/usage/operations/projections/ob_tran.rst
diff --git a/docs/source/projections/ocea.rst b/docs/source/usage/operations/projections/ocea.rst
index 40005d9e..40005d9e 100644
--- a/docs/source/projections/ocea.rst
+++ b/docs/source/usage/operations/projections/ocea.rst
diff --git a/docs/source/projections/oea.rst b/docs/source/usage/operations/projections/oea.rst
index 379dc157..379dc157 100644
--- a/docs/source/projections/oea.rst
+++ b/docs/source/usage/operations/projections/oea.rst
diff --git a/docs/source/projections/omerc.rst b/docs/source/usage/operations/projections/omerc.rst
index 114b9fa3..114b9fa3 100644
--- a/docs/source/projections/omerc.rst
+++ b/docs/source/usage/operations/projections/omerc.rst
diff --git a/docs/source/projections/ortel.rst b/docs/source/usage/operations/projections/ortel.rst
index 03f132ef..03f132ef 100644
--- a/docs/source/projections/ortel.rst
+++ b/docs/source/usage/operations/projections/ortel.rst
diff --git a/docs/source/projections/ortho.rst b/docs/source/usage/operations/projections/ortho.rst
index 131dbfc7..131dbfc7 100644
--- a/docs/source/projections/ortho.rst
+++ b/docs/source/usage/operations/projections/ortho.rst
diff --git a/docs/source/projections/pconic.rst b/docs/source/usage/operations/projections/pconic.rst
index 6bc0018e..6bc0018e 100644
--- a/docs/source/projections/pconic.rst
+++ b/docs/source/usage/operations/projections/pconic.rst
diff --git a/docs/source/projections/poly.rst b/docs/source/usage/operations/projections/poly.rst
index e252feb5..e252feb5 100644
--- a/docs/source/projections/poly.rst
+++ b/docs/source/usage/operations/projections/poly.rst
diff --git a/docs/source/projections/putp1.rst b/docs/source/usage/operations/projections/putp1.rst
index 68971a46..68971a46 100644
--- a/docs/source/projections/putp1.rst
+++ b/docs/source/usage/operations/projections/putp1.rst
diff --git a/docs/source/projections/putp2.rst b/docs/source/usage/operations/projections/putp2.rst
index 01ea8073..01ea8073 100644
--- a/docs/source/projections/putp2.rst
+++ b/docs/source/usage/operations/projections/putp2.rst
diff --git a/docs/source/projections/putp3.rst b/docs/source/usage/operations/projections/putp3.rst
index 3aa6b9e6..3aa6b9e6 100644
--- a/docs/source/projections/putp3.rst
+++ b/docs/source/usage/operations/projections/putp3.rst
diff --git a/docs/source/projections/putp3p.rst b/docs/source/usage/operations/projections/putp3p.rst
index 5b87512e..5b87512e 100644
--- a/docs/source/projections/putp3p.rst
+++ b/docs/source/usage/operations/projections/putp3p.rst
diff --git a/docs/source/projections/putp4p.rst b/docs/source/usage/operations/projections/putp4p.rst
index b211ad9b..b211ad9b 100644
--- a/docs/source/projections/putp4p.rst
+++ b/docs/source/usage/operations/projections/putp4p.rst
diff --git a/docs/source/projections/putp5.rst b/docs/source/usage/operations/projections/putp5.rst
index 5b60a961..5b60a961 100644
--- a/docs/source/projections/putp5.rst
+++ b/docs/source/usage/operations/projections/putp5.rst
diff --git a/docs/source/projections/putp5p.rst b/docs/source/usage/operations/projections/putp5p.rst
index f586b889..f586b889 100644
--- a/docs/source/projections/putp5p.rst
+++ b/docs/source/usage/operations/projections/putp5p.rst
diff --git a/docs/source/projections/putp6.rst b/docs/source/usage/operations/projections/putp6.rst
index 94683ace..94683ace 100644
--- a/docs/source/projections/putp6.rst
+++ b/docs/source/usage/operations/projections/putp6.rst
diff --git a/docs/source/projections/putp6p.rst b/docs/source/usage/operations/projections/putp6p.rst
index 8c3add71..8c3add71 100644
--- a/docs/source/projections/putp6p.rst
+++ b/docs/source/usage/operations/projections/putp6p.rst
diff --git a/docs/source/projections/qsc.rst b/docs/source/usage/operations/projections/qsc.rst
index dedd6ff4..e3af2cee 100644
--- a/docs/source/projections/qsc.rst
+++ b/docs/source/usage/operations/projections/qsc.rst
@@ -23,7 +23,7 @@ Quadrilateralized Spherical Cube
 The purpose of the Quadrilateralized Spherical Cube (QSC) projection is to project
 a sphere surface onto the six sides of a cube:
 
-.. image:: ../../images/qsc_concept.jpg
+.. image:: ../../../../images/qsc_concept.jpg
    :scale: 50%
    :align: center
    :alt:   Quadrilateralized Spherical Cube
@@ -112,32 +112,32 @@ Explanation:
 The resulting images can be laid out in a grid like below.
 
 
-.. |topside| image:: ../../images/qsc_topside.jpg
+.. |topside| image:: ../../../../images/qsc_topside.jpg
    :scale: 50%
    :align: middle
    :alt:   Top side
 
-.. |leftside| image:: ../../images/qsc_leftside.jpg
+.. |leftside| image:: ../../../../images/qsc_leftside.jpg
    :scale: 50%
    :align: middle
    :alt:   Left side
 
-.. |frontside| image:: ../../images/qsc_frontside.jpg
+.. |frontside| image:: ../../../../images/qsc_frontside.jpg
    :scale: 50%
    :align: middle
    :alt:   Front side
 
-.. |rightside| image:: ../../images/qsc_rightside.jpg
+.. |rightside| image:: ../../../../images/qsc_rightside.jpg
    :scale: 50%
    :align: middle
    :alt:   Right side
 
-.. |backside| image:: ../../images/qsc_backside.jpg
+.. |backside| image:: ../../../../images/qsc_backside.jpg
    :scale: 50%
    :align: middle
    :alt:   Back side
 
-.. |bottomside| image:: ../../images/qsc_bottomside.jpg
+.. |bottomside| image:: ../../../../images/qsc_bottomside.jpg
    :scale: 50%
    :align: middle
    :alt:   Bottom side
diff --git a/docs/source/projections/qua_aut.rst b/docs/source/usage/operations/projections/qua_aut.rst
index d3a0aece..d3a0aece 100644
--- a/docs/source/projections/qua_aut.rst
+++ b/docs/source/usage/operations/projections/qua_aut.rst
diff --git a/docs/source/projections/rhealpix.rst b/docs/source/usage/operations/projections/rhealpix.rst
index 1701558e..5808cfaa 100644
--- a/docs/source/projections/rhealpix.rst
+++ b/docs/source/usage/operations/projections/rhealpix.rst
@@ -21,7 +21,7 @@ rHEALPix
 |                     | Valid inputs are 0--3. Defaults to 0.                    |
 +---------------------+----------------------------------------------------------+
 
-.. image:: ../../images/rhealpix.png
+.. image:: ../../../../images/rhealpix.png
    :scale: 75%
    :alt:   rHEALPix
 
diff --git a/docs/source/projections/robin.rst b/docs/source/usage/operations/projections/robin.rst
index 3e58be46..3e58be46 100644
--- a/docs/source/projections/robin.rst
+++ b/docs/source/usage/operations/projections/robin.rst
diff --git a/docs/source/projections/rouss.rst b/docs/source/usage/operations/projections/rouss.rst
index e27fb1cf..e27fb1cf 100644
--- a/docs/source/projections/rouss.rst
+++ b/docs/source/usage/operations/projections/rouss.rst
diff --git a/docs/source/projections/rpoly.rst b/docs/source/usage/operations/projections/rpoly.rst
index 80e0d640..80e0d640 100644
--- a/docs/source/projections/rpoly.rst
+++ b/docs/source/usage/operations/projections/rpoly.rst
diff --git a/docs/source/projections/sinu.rst b/docs/source/usage/operations/projections/sinu.rst
index a7ebd232..a7ebd232 100644
--- a/docs/source/projections/sinu.rst
+++ b/docs/source/usage/operations/projections/sinu.rst
diff --git a/docs/source/projections/somerc.rst b/docs/source/usage/operations/projections/somerc.rst
index c572622b..c572622b 100644
--- a/docs/source/projections/somerc.rst
+++ b/docs/source/usage/operations/projections/somerc.rst
diff --git a/docs/source/projections/stere.rst b/docs/source/usage/operations/projections/stere.rst
index d4958ec9..d4958ec9 100644
--- a/docs/source/projections/stere.rst
+++ b/docs/source/usage/operations/projections/stere.rst
diff --git a/docs/source/projections/sterea.rst b/docs/source/usage/operations/projections/sterea.rst
index 4f2f8727..4f2f8727 100644
--- a/docs/source/projections/sterea.rst
+++ b/docs/source/usage/operations/projections/sterea.rst
diff --git a/docs/source/projections/tcc.rst b/docs/source/usage/operations/projections/tcc.rst
index 586dd3b8..586dd3b8 100644
--- a/docs/source/projections/tcc.rst
+++ b/docs/source/usage/operations/projections/tcc.rst
diff --git a/docs/source/projections/tcea.rst b/docs/source/usage/operations/projections/tcea.rst
index cf5549a3..cf5549a3 100644
--- a/docs/source/projections/tcea.rst
+++ b/docs/source/usage/operations/projections/tcea.rst
diff --git a/docs/source/projections/tissot.rst b/docs/source/usage/operations/projections/tissot.rst
index 7ec1a741..7ec1a741 100644
--- a/docs/source/projections/tissot.rst
+++ b/docs/source/usage/operations/projections/tissot.rst
diff --git a/docs/source/projections/tmerc.rst b/docs/source/usage/operations/projections/tmerc.rst
index 03aa2830..03aa2830 100644
--- a/docs/source/projections/tmerc.rst
+++ b/docs/source/usage/operations/projections/tmerc.rst
diff --git a/docs/source/projections/tpeqd.rst b/docs/source/usage/operations/projections/tpeqd.rst
index e6d7ef29..e6d7ef29 100644
--- a/docs/source/projections/tpeqd.rst
+++ b/docs/source/usage/operations/projections/tpeqd.rst
diff --git a/docs/source/projections/tpers.rst b/docs/source/usage/operations/projections/tpers.rst
index 345a5faa..345a5faa 100644
--- a/docs/source/projections/tpers.rst
+++ b/docs/source/usage/operations/projections/tpers.rst
diff --git a/docs/source/projections/ups.rst b/docs/source/usage/operations/projections/ups.rst
index 7a9ab50b..7a9ab50b 100644
--- a/docs/source/projections/ups.rst
+++ b/docs/source/usage/operations/projections/ups.rst
diff --git a/docs/source/projections/urm5.rst b/docs/source/usage/operations/projections/urm5.rst
index 91d06308..91d06308 100644
--- a/docs/source/projections/urm5.rst
+++ b/docs/source/usage/operations/projections/urm5.rst
diff --git a/docs/source/projections/urmfps.rst b/docs/source/usage/operations/projections/urmfps.rst
index 515ced84..515ced84 100644
--- a/docs/source/projections/urmfps.rst
+++ b/docs/source/usage/operations/projections/urmfps.rst
diff --git a/docs/source/projections/utm.rst b/docs/source/usage/operations/projections/utm.rst
index 7fb66cb8..7fb66cb8 100644
--- a/docs/source/projections/utm.rst
+++ b/docs/source/usage/operations/projections/utm.rst
diff --git a/docs/source/projections/vandg.rst b/docs/source/usage/operations/projections/vandg.rst
index cdc772bb..cdc772bb 100644
--- a/docs/source/projections/vandg.rst
+++ b/docs/source/usage/operations/projections/vandg.rst
diff --git a/docs/source/projections/vandg2.rst b/docs/source/usage/operations/projections/vandg2.rst
index 556929e2..556929e2 100644
--- a/docs/source/projections/vandg2.rst
+++ b/docs/source/usage/operations/projections/vandg2.rst
diff --git a/docs/source/projections/vandg3.rst b/docs/source/usage/operations/projections/vandg3.rst
index d767c4d5..d767c4d5 100644
--- a/docs/source/projections/vandg3.rst
+++ b/docs/source/usage/operations/projections/vandg3.rst
diff --git a/docs/source/projections/vandg4.rst b/docs/source/usage/operations/projections/vandg4.rst
index 097ba1d8..097ba1d8 100644
--- a/docs/source/projections/vandg4.rst
+++ b/docs/source/usage/operations/projections/vandg4.rst
diff --git a/docs/source/projections/vitk1.rst b/docs/source/usage/operations/projections/vitk1.rst
index b9081547..b9081547 100644
--- a/docs/source/projections/vitk1.rst
+++ b/docs/source/usage/operations/projections/vitk1.rst
diff --git a/docs/source/projections/wag1.rst b/docs/source/usage/operations/projections/wag1.rst
index dd1ed39e..dd1ed39e 100644
--- a/docs/source/projections/wag1.rst
+++ b/docs/source/usage/operations/projections/wag1.rst
diff --git a/docs/source/projections/wag2.rst b/docs/source/usage/operations/projections/wag2.rst
index 9c7b0edc..9c7b0edc 100644
--- a/docs/source/projections/wag2.rst
+++ b/docs/source/usage/operations/projections/wag2.rst
diff --git a/docs/source/projections/wag3.rst b/docs/source/usage/operations/projections/wag3.rst
index fb70a0a6..fb70a0a6 100644
--- a/docs/source/projections/wag3.rst
+++ b/docs/source/usage/operations/projections/wag3.rst
diff --git a/docs/source/projections/wag4.rst b/docs/source/usage/operations/projections/wag4.rst
index 7b8dac96..7b8dac96 100644
--- a/docs/source/projections/wag4.rst
+++ b/docs/source/usage/operations/projections/wag4.rst
diff --git a/docs/source/projections/wag5.rst b/docs/source/usage/operations/projections/wag5.rst
index f880290b..f880290b 100644
--- a/docs/source/projections/wag5.rst
+++ b/docs/source/usage/operations/projections/wag5.rst
diff --git a/docs/source/projections/wag6.rst b/docs/source/usage/operations/projections/wag6.rst
index f74749a5..f74749a5 100644
--- a/docs/source/projections/wag6.rst
+++ b/docs/source/usage/operations/projections/wag6.rst
diff --git a/docs/source/projections/wag7.rst b/docs/source/usage/operations/projections/wag7.rst
index be1401b8..be1401b8 100644
--- a/docs/source/projections/wag7.rst
+++ b/docs/source/usage/operations/projections/wag7.rst
diff --git a/docs/source/projections/weren.rst b/docs/source/usage/operations/projections/weren.rst
index de7c5abf..de7c5abf 100644
--- a/docs/source/projections/weren.rst
+++ b/docs/source/usage/operations/projections/weren.rst
diff --git a/docs/source/projections/wink1.rst b/docs/source/usage/operations/projections/wink1.rst
index 00346765..00346765 100644
--- a/docs/source/projections/wink1.rst
+++ b/docs/source/usage/operations/projections/wink1.rst
diff --git a/docs/source/projections/wink2.rst b/docs/source/usage/operations/projections/wink2.rst
index 7e9b48a7..7e9b48a7 100644
--- a/docs/source/projections/wink2.rst
+++ b/docs/source/usage/operations/projections/wink2.rst
diff --git a/docs/source/projections/wintri.rst b/docs/source/usage/operations/projections/wintri.rst
index bfd5032f..bfd5032f 100644
--- a/docs/source/projections/wintri.rst
+++ b/docs/source/usage/operations/projections/wintri.rst
diff --git a/docs/source/usage/operations/transformations/cart.rst b/docs/source/usage/operations/transformations/cart.rst
new file mode 100644
index 00000000..0c3c7c23
--- /dev/null
+++ b/docs/source/usage/operations/transformations/cart.rst
@@ -0,0 +1,24 @@
+.. _cart:
+
+================================================================================
+Cartesian to geodetic conversion
+================================================================================
+
+Convert geodetic coordinates to cartesian coordinates.
+
++--------------+--------------------------------------------------------------------+
+| **Options**                                                                       |
++--------------+--------------------------------------------------------------------+
+| `+ellps`     |  Ellipsoid of the input coordinates. If used together with the     |
+|              |  ellipsoid parameters below, ``+ellps`` is overwritten.            |
++--------------+--------------------------------------------------------------------+
+| `+a`         | Semi-major radius of ellipsoid axis.                               |
++--------------+--------------------------------------------------------------------+
+| `+b`         | Semi-minor radius of ellipsoid axis.                               |
++--------------+--------------------------------------------------------------------+
+| `+es`        | Eccentricity of ellipsoid.                                         |
++--------------+--------------------------------------------------------------------+
+| `+f`         | Flattening of ellipsoid.                                           |
++--------------+--------------------------------------------------------------------+
+
+
diff --git a/docs/source/usage/operations/transformations/helmert.rst b/docs/source/usage/operations/transformations/helmert.rst
new file mode 100644
index 00000000..46073b63
--- /dev/null
+++ b/docs/source/usage/operations/transformations/helmert.rst
@@ -0,0 +1,7 @@
+.. _helmert:
+
+================================================================================
+Helmert transform
+================================================================================
+
+Change reference frame by Helmert shift.
diff --git a/docs/source/usage/operations/transformations/hgridshift.rst b/docs/source/usage/operations/transformations/hgridshift.rst
new file mode 100644
index 00000000..78e46aa9
--- /dev/null
+++ b/docs/source/usage/operations/transformations/hgridshift.rst
@@ -0,0 +1,32 @@
+.. _hgridshift:
+
+================================================================================
+Horizontal grid shift
+================================================================================
+
+Change of horizontal datum by grid shift.
+
++--------------+--------------------------------------------------------------------+
+| **Options**                                                                       |
++--------------+--------------------------------------------------------------------+
+| `+grids`     | Comma-separated list of grids to load.                             |
++--------------+--------------------------------------------------------------------+
+
+The horizontal grid shift is done by offsetting the planar input coordinates by
+a specific amount determined by the loaded grids. The simplest use case of the
+horizontal grid shift is applying a single grid::
+
+    +hgridshift +grids=nzgr2kgrid0005.gsb
+
+
+More than one grid can be loaded at the same time, for instance in case the
+dataset needs to be transformed spans several countries. In this example grids
+of the continental US, Alaska and Canada is loaded at the same time::
+
+    +hgridshift +grids=@conus,@alaska,@ntv2_0.gsb,@ntv_can.dat
+
+The ``@`` in the above example states that the grid is optional, in case the grid
+is not found in the PROJ.4 search path. The list of grids is prioritized so that
+grids in the start of the list takes presedence over the grids in the back of the
+list.
+
diff --git a/docs/source/usage/operations/transformations/index.rst b/docs/source/usage/operations/transformations/index.rst
new file mode 100644
index 00000000..8bf2a890
--- /dev/null
+++ b/docs/source/usage/operations/transformations/index.rst
@@ -0,0 +1,15 @@
+.. _transformation_list:
+
+================================================================================
+Transformations
+================================================================================
+
+.. toctree::
+   :maxdepth: 1
+
+   cart
+   helmert
+   molodensky
+   hgridshift
+   vgridshift
+   unitconvert
diff --git a/docs/source/usage/operations/transformations/molodensky.rst b/docs/source/usage/operations/transformations/molodensky.rst
new file mode 100644
index 00000000..3fa8f9a8
--- /dev/null
+++ b/docs/source/usage/operations/transformations/molodensky.rst
@@ -0,0 +1,7 @@
+.. _molodensky:
+
+================================================================================
+Molodensky transform
+================================================================================
+
+Perform a datum shift in geodetic coordinate space.
diff --git a/docs/source/usage/operations/transformations/unitconvert.rst b/docs/source/usage/operations/transformations/unitconvert.rst
new file mode 100644
index 00000000..458d0c15
--- /dev/null
+++ b/docs/source/usage/operations/transformations/unitconvert.rst
@@ -0,0 +1,7 @@
+.. _unitconvert:
+
+================================================================================
+Unit conversion
+================================================================================
+
+Convert between various distance and time units.
diff --git a/docs/source/usage/operations/transformations/vgridshift.rst b/docs/source/usage/operations/transformations/vgridshift.rst
new file mode 100644
index 00000000..f48d40c8
--- /dev/null
+++ b/docs/source/usage/operations/transformations/vgridshift.rst
@@ -0,0 +1,34 @@
+.. _vgridshift:
+
+================================================================================
+Vertical grid shift
+================================================================================
+
+Change Vertical datum change by grid shift
+
++--------------+--------------------------------------------------------------------+
+| **Options**                                                                       |
++--------------+--------------------------------------------------------------------+
+| `+grids`     | Comma-separated list of grids to load.                             |
++--------------+--------------------------------------------------------------------+
+
+The vertical grid shift is done by offsetting the vertical input coordinates by
+a specific amount determined by the loaded grids. The simplest use case of the
+horizontal grid shift is applying a single grid. Here we change the vertical
+reference from the ellipsoid to the global geoid model, EGM96::
+
+    +vgridshift +grids=egm96_16.gtx
+
+
+More than one grid can be loaded at the same time, for instance in the case where
+a better geoid model than the global is available for a certain area. Here the
+gridshift is set up so that the local DVR90 geoid model takes presedence over
+the global model::
+
+    +vgridshift +grids=@dvr90.gtx,egm96_16.gtx
+
+The ``@`` in the above example states that the grid is optional, in case the grid
+is not found in the PROJ.4 search path. The list of grids is prioritized so that
+grids in the start of the list takes presedence over the grids in the back of the
+list.
+