Expand documentation for Interrupted Goode Homolosine.

OSGeo · Mar 28, 2022 · 4228557 · 4228557
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diff --git a/docs/source/operations/projections/igh.rst b/docs/source/operations/projections/igh.rst
@@ -28,6 +28,16 @@ Interrupted Goode Homolosine
 
    proj-string: ``+proj=igh``
 
+
+The Interrupted Goode Homolosine projection is an equal-area composite
+projection intended for making world maps. Low latitudes are comprised of six
+separate Sinusoidal projection regions, and high latitudes are comprised of
+six separate Mollweide (``homolographic``) projections. The transition latitude
+is at 40d 44' 11.8", where the Sinusoidal and Mollweide scales are equal. The
+lobes in this projection are chosen to emphasize the land area of the Earth. This
+projection was first published in 1925 by J. P. Goode :cite:`Goode1925`.
+
+
 Parameters
 ################################################################################
 

diff --git a/docs/source/operations/projections/igh_o.rst b/docs/source/operations/projections/igh_o.rst
@@ -28,6 +28,18 @@ Interrupted Goode Homolosine (Oceanic View)
 
    proj-string: ``+proj=igh_o +lon_0=-160``
 
+
+The Interrupted Goode Homolosine (Oceanic View) projection is an equal-area
+composite projection intended for making maps of the Earth's oceans. Low
+latitudes are comprised of six separate Sinusoidal projection regions, and high
+latitudes are comprised of six separate Mollweide (``homolographic``)
+projections. The transition latitude is at 40d 44' 11.8", where the Sinusoidal
+and Mollweide scales are equal. The lobes in this projection are chosen to
+emphasize the ocean area of the Earth when used with a central longitude
+of -160 degrees. This projection was first published in 1925 by J. P. Goode
+:cite:`Goode1925`.
+
+
 Parameters
 ################################################################################