From 114b144ee09ddb3aa8f27c335fc2d61982ff1041 Mon Sep 17 00:00:00 2001
From: David Manthey <david.manthey@kitware.com>
Date: Thu, 7 Jun 2018 13:03:22 -0400
Subject: [PATCH] Proj4 doesn't include some projections by default.  Include
 them.

---
 examples/reprojection/main.js | 4 ++--
 src/transform.js              | 8 ++++++++
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/examples/reprojection/main.js b/examples/reprojection/main.js
index ebe82c5c9d..22811ee7ee 100644
--- a/examples/reprojection/main.js
+++ b/examples/reprojection/main.js
@@ -114,7 +114,7 @@ $(function () {
       node: '#map',
       center: {x: 0, y: 0},
       zoom: 2.5,
-      gcs: gcsTable[gcs],
+      gcs: gcsTable[gcs] || gcs,
       unitsPerPixel: (range[1].x - range[0].x) / 256,
       clampBoundsX: false,
       clampBoundsY: false,
@@ -131,7 +131,7 @@ $(function () {
       gcs: 'EPSG:3857',
       attribution: $('#url-list [value="' + $('#layer-url').val() + '"]').attr(
           'credit'),
-      minLevel: 4,
+      minLevel: query.minLevel ? parseInt(query.minLevel, 10) : 4,
       keepLower: true,
       wrapX: false,
       wrapY: false
diff --git a/src/transform.js b/src/transform.js
index ed44620072..38fa271540 100644
--- a/src/transform.js
+++ b/src/transform.js
@@ -1,4 +1,9 @@
 var proj4 = require('proj4');
+/* These projections exist in proj4 but aren't included by default. */
+proj4.Proj.projections.add(require('proj4/projections/equi'));
+proj4.Proj.projections.add(require('proj4/projections/gauss'));
+proj4.Proj.projections.add(require('proj4/projections/gstmerc'));
+proj4.Proj.projections.add(require('proj4/projections/ortho'));
 var util = require('./util');
 
 /**
@@ -614,4 +619,7 @@ transform.vincentyDistance = function (pt1, pt2, gcs, baseGcs, ellipsoid, maxIte
   };
 };
 
+/* Expose proj4 to make it easier to debug */
+transform.proj4 = proj4;
+
 module.exports = transform;