aboutsummaryrefslogtreecommitdiff
path: root/docs/source/glossary.rst
diff options
context:
space:
mode:
Diffstat (limited to 'docs/source/glossary.rst')
-rw-r--r--docs/source/glossary.rst41
1 files changed, 41 insertions, 0 deletions
diff --git a/docs/source/glossary.rst b/docs/source/glossary.rst
new file mode 100644
index 00000000..92b75ecd
--- /dev/null
+++ b/docs/source/glossary.rst
@@ -0,0 +1,41 @@
+.. _glossary::
+
+================================================================================
+Glossary
+================================================================================
+
+.. glossary::
+
+ Pseudocylindrical Projection
+
+ Pseudocylindrical projections have the mathematical characteristics of
+
+ .. math::
+
+ \begin {array}
+
+ x &= f(\lambda,\phi)
+
+ y &= g(\phi)
+
+ \end {array}
+
+ where the parallels of latitude are straight lines, like cylindrical
+ projections, but the meridians are curved toward the center as they
+ depart from the equator. This is an effort to minimize the distortion
+ of the polar regions inherent in the cylindrical projections.
+
+ Pseudocylindrical projections are almost exclusively used for small
+ scale global displays and, except for the Sinusoidal projection, only
+ derived for a spherical Earth. Because of the basic definition none of
+ the pseudocylindrical projections are conformal but many are equal
+ area.
+
+ To further reduce distortion, pseudocylindrical are often presented in
+ interrupted form that are made by joining several regions with
+ appropriate central meridians and false easting and clipping
+ boundaries. Interrupted Homolosine constructions are suited for showing
+ respective global land and oceanic regions, for example. To reduce the
+ lateral size of the map, some uses remove an irregular, North-South
+ strip of the mid-Atlantic region so that the western tip of Africa is
+ plotted north of the eastern tip of South America.