Merge pull request #1855 from rouault/rfc4_merge_back_master

[RFC4_dev] Merge master back to rfc4 latest branch

2 files changed, 32 insertions, 7 deletions

diff --git a/docs/source/operations/operations_computation.rst b/docs/source/operations/operations_computation.rst
index 930044e3..ef84cfb2 100644
--- a/docs/source/operations/operations_computation.rst
+++ b/docs/source/operations/operations_computation.rst
@@ -5,7 +5,7 @@ Computation of coordinate operations between two CRS
 ================================================================================
 
 :Author: Even Rouault
-:Last Updated: 2019-11-28
+:Last Updated: 2020-01-02
 
 Introduction
 ------------
@@ -41,8 +41,8 @@ geographic CRS:
     DERIVED_FROM(EPSG):1313, NAD27 to NAD83 (4), 1.5 m, Canada - NAD27, at least one grid missing
     DERIVED_FROM(EPSG):1241, NAD27 to NAD83 (1), 0.15 m, USA - CONUS including EEZ
     DERIVED_FROM(EPSG):1243, NAD27 to NAD83 (2), 0.5 m, USA - Alaska including EEZ
+    DERIVED_FROM(EPSG):1573, NAD27 to NAD83 (6), 1.5 m, Canada - Quebec, at least one grid missing
     EPSG:1462, NAD27 to NAD83 (5), 1.0 m, Canada - Quebec, at least one grid missing
-    EPSG:1573, NAD27 to NAD83 (6), 1.5 m, Canada - Quebec, at least one grid missing
     EPSG:9111, NAD27 to NAD83 (9), 1.5 m, Canada - Saskatchewan, at least one grid missing
     unknown id, Ballpark geographic offset from NAD27 to NAD83, unknown accuracy, World, has ballpark transformation
     EPSG:8555, NAD27 to NAD83 (7), 0.15 m, USA - CONUS and GoM, at least one grid missing
@@ -236,7 +236,7 @@ are equivalent for most purposes.
 
 .. code-block:: shell
 
-    $ projinfo projinfo -s EPSG:7042 -t EPSG:4936
+    $ projinfo -s EPSG:7042 -t EPSG:4936
 
     Candidate operations found: 1
     -------------------------------------
@@ -304,12 +304,12 @@ the source and target CRS, and inverting the resulting operation(s):
     $ projinfo -s NAD83 -t NAD27 --spatial-test intersects --summary
 
     Candidate operations found: 10
-    INVERSE(DERIVED_FROM(EPSG)):1312, Inverse of NAD27 to NAD83 (3), 1.0 m, Canada
+    INVERSE(DERIVED_FROM(EPSG)):1312, Inverse of NAD27 to NAD83 (3), 2.0 m, Canada
+    INVERSE(DERIVED_FROM(EPSG)):1313, Inverse of NAD27 to NAD83 (4), 1.5 m, Canada - NAD27
     INVERSE(DERIVED_FROM(EPSG)):1241, Inverse of NAD27 to NAD83 (1), 0.15 m, USA - CONUS including EEZ
     INVERSE(DERIVED_FROM(EPSG)):1243, Inverse of NAD27 to NAD83 (2), 0.5 m, USA - Alaska including EEZ
-    INVERSE(DERIVED_FROM(EPSG)):1313, Inverse of NAD27 to NAD83 (4), 1.5 m, Canada - NAD27, at least one grid missing
-    INVERSE(EPSG):1462, Inverse of NAD27 to NAD83 (5), 1.0 m, Canada - Quebec, at least one grid missing
-    INVERSE(EPSG):1573, Inverse of NAD27 to NAD83 (6), 1.5 m, Canada - Quebec, at least one grid missing
+    INVERSE(DERIVED_FROM(EPSG)):1573, Inverse of NAD27 to NAD83 (6), 1.5 m, Canada - Quebec, at least one grid missing
+    INVERSE(EPSG):1462, Inverse of NAD27 to NAD83 (5), 2.0 m, Canada - Quebec, at least one grid missing
     INVERSE(EPSG):9111, Inverse of NAD27 to NAD83 (9), 1.5 m, Canada - Saskatchewan, at least one grid missing
     unknown id, Ballpark geographic offset from NAD83 to NAD27, unknown accuracy, World, has ballpark transformation
     INVERSE(EPSG):8555, Inverse of NAD27 to NAD83 (7), 0.15 m, USA - CONUS and GoM, at least one grid missing
diff --git a/docs/source/operations/projections/isea.rst b/docs/source/operations/projections/isea.rst
index 1afedc30..adb703a1 100644
--- a/docs/source/operations/projections/isea.rst
+++ b/docs/source/operations/projections/isea.rst
@@ -4,6 +4,31 @@
 Icosahedral Snyder Equal Area
 ********************************************************************************
 
+Snyder's Icosahedral Equal Area map projections on polyhedral globes for the
+dodecahedron and truncated icosahedron offer relatively low scale and
+angular distortion. The equations involved are relatively straight-forward,
+and for certain instructional tools and databases, the projections are useful
+for world maps. The interruptions remain a disadvantage, as with any low-error
+projection system applied to the entire globe :cite:`Snyder1992`.
+
+
++---------------------+----------------------------------------------------------+
+| **Classification**  | Polyhedral, equal area                                   |
++---------------------+----------------------------------------------------------+
+| **Available forms** | Forward, spherical                                       |
++---------------------+----------------------------------------------------------+
+| **Defined area**    | Global                                                   |
++---------------------+----------------------------------------------------------+
+| **Alias**           | isea                                                     |
++---------------------+----------------------------------------------------------+
+| **Domain**          | 2D                                                       |
++---------------------+----------------------------------------------------------+
+| **Input type**      | Geodetic coordinates                                     |
++---------------------+----------------------------------------------------------+
+| **Output type**     | Projected coordinates                                    |
++---------------------+----------------------------------------------------------+
+
+
 .. figure:: ./images/isea.png
    :width: 500 px
    :align: center