From 2e5470387df8c713af18e601c0e6a4b352294556 Mon Sep 17 00:00:00 2001
From: John Krasting <John.Krasting@noaa.gov>
Date: Mon, 18 May 2020 20:04:04 -0400
Subject: Implemented IGH Oceanic View (#2226)

- The current implementation of the Interrupted Goode Homolosine
  projection emphasizes land area. This is a compliment projection
  that emphasizes ocean area.
- A value of lon0=-160 produces a reasonable real-world map.
---
 docs/plot/plotdefs.json                            |  11 ++++++
 docs/source/operations/projections/igh_o.rst       |  42 +++++++++++++++++++++
 .../source/operations/projections/images/igh_o.png | Bin 0 -> 384379 bytes
 docs/source/operations/projections/index.rst       |   1 +
 4 files changed, 54 insertions(+)
 create mode 100644 docs/source/operations/projections/igh_o.rst
 create mode 100644 docs/source/operations/projections/images/igh_o.png

(limited to 'docs')

diff --git a/docs/plot/plotdefs.json b/docs/plot/plotdefs.json
index 9a2f4836..53340a68 100644
--- a/docs/plot/plotdefs.json
+++ b/docs/plot/plotdefs.json
@@ -554,6 +554,17 @@
         "res": "low",
         "type": "line"
     },
+    {
+        "filename": "igh_o.png",
+        "latmax": 90,
+        "latmin": -90,
+        "lonmax": 180,
+        "lonmin": -180,
+        "name": "igh_o",
+        "projstring": "+proj=igh_o +lon_0=-160",
+        "res": "low",
+        "type": "line"
+    },
     {
         "filename": "imw_p.png",
         "latmax": 90,
diff --git a/docs/source/operations/projections/igh_o.rst b/docs/source/operations/projections/igh_o.rst
new file mode 100644
index 00000000..2df7223a
--- /dev/null
+++ b/docs/source/operations/projections/igh_o.rst
@@ -0,0 +1,42 @@
+.. _igh_o:
+
+********************************************************************************
+Interrupted Goode Homolosine (Oceanic View)
+********************************************************************************
+
++---------------------+----------------------------------------------------------+
+| **Classification**  | Pseudocylindrical                                        |
++---------------------+----------------------------------------------------------+
+| **Available forms** | Forward and inverse, spherical projection                |
++---------------------+----------------------------------------------------------+
+| **Defined area**    | Global                                                   |
++---------------------+----------------------------------------------------------+
+| **Alias**           | igh_o                                                    |
++---------------------+----------------------------------------------------------+
+| **Domain**          | 2D                                                       |
++---------------------+----------------------------------------------------------+
+| **Input type**      | Geodetic coordinates                                     |
++---------------------+----------------------------------------------------------+
+| **Output type**     | Projected coordinates                                    |
++---------------------+----------------------------------------------------------+
+
+
+.. figure:: ./images/igh_o.png
+   :width: 500 px
+   :align: center
+   :alt:   Interrupted Goode Homolosine
+
+   proj-string: ``+proj=igh_o +lon_0=-160``
+
+Parameters
+################################################################################
+
+.. note:: All parameters are optional for the projection. A value of +lon_0=-160 is recommended.
+
+.. include:: ../options/lon_0.rst
+
+.. include:: ../options/R.rst
+
+.. include:: ../options/x_0.rst
+
+.. include:: ../options/y_0.rst
diff --git a/docs/source/operations/projections/images/igh_o.png b/docs/source/operations/projections/images/igh_o.png
new file mode 100644
index 00000000..35910f50
Binary files /dev/null and b/docs/source/operations/projections/images/igh_o.png differ
diff --git a/docs/source/operations/projections/index.rst b/docs/source/operations/projections/index.rst
index fc2ef9fd..169187cc 100644
--- a/docs/source/operations/projections/index.rst
+++ b/docs/source/operations/projections/index.rst
@@ -64,6 +64,7 @@ Projections map the spherical 3D space to a flat 2D space.
    healpix
    rhealpix
    igh
+   igh_o
    imw_p
    isea
    kav5
-- 
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