isea docs: Rewrite intro and reference to reflect actual projection

Previous version was describing oea by mistake. It is also a projection
by Snyder and the isea docs was based on the paper on the oea
projection. This commit fixes that.

2 files changed, 21 insertions, 8 deletions

diff --git a/docs/source/operations/projections/isea.rst b/docs/source/operations/projections/isea.rst
index 968d468b..adb703a1 100644
--- a/docs/source/operations/projections/isea.rst
+++ b/docs/source/operations/projections/isea.rst
@@ -4,16 +4,16 @@
 Icosahedral Snyder Equal Area
 ********************************************************************************
 
-The Icosaheadra Snyder Equal Area projection is a series of equal-area map
-projections. Lines of constant distortion follow approximately oval or
-rectangular paths instead of the circles of the Lambert Azimuthal Equal-Area
-projection or the straight lines of the Cylindrical Equal-Area projection. The
-projection series permits design of equal-area maps of oblong regions with less
-overall distortion of shape and scale than equal-area maps on other projections
-:cite:`Snyder1988`.
+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                                   |
+| **Classification**  | Polyhedral, equal area                                   |
 +---------------------+----------------------------------------------------------+
 | **Available forms** | Forward, spherical                                       |
 +---------------------+----------------------------------------------------------+
diff --git a/docs/source/references.bib b/docs/source/references.bib
index 0668e10d..15df52d7 100644
--- a/docs/source/references.bib
+++ b/docs/source/references.bib
@@ -317,6 +317,19 @@
   Url                      = {https://www.researchgate.net/publication/290447301_The_Natural_Earth_II_world_map_projection}
 }
 
+@Article{Snyder1992,
+  Title                    = {An Equal-Area Map Projection For Polyhedral Globes},
+  Author                   = {John P. Snyder},
+  Journal                  = {Cartographica},
+  Year                     = {1992},
+  Number                   = {1},
+  Pages                    = {10--21},
+  Volume                   = {29},
+
+  Doi                      = {DOI: 10.3138/27H7-8K88-4882-1752},
+  Uri                      = {https://doi.org/10.3138/27H7-8K88-4882-1752}
+}
+
 @Book{Snyder1993,
   Title                    = {Flattening the Earth},
   Author                   = {John P. Snyder},