From c9db0788121233fdfc4fa9d4250b954a2bb97167 Mon Sep 17 00:00:00 2001
From: mbull <Michael.A.Bull@jpl.nasa.gov>
Date: Mon, 29 Feb 2016 12:21:09 -0800
Subject: Add comment

---
 src/PJ_misrsom.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

(limited to 'src')

diff --git a/src/PJ_misrsom.c b/src/PJ_misrsom.c
index 82a3275e..224a3d0a 100644
--- a/src/PJ_misrsom.c
+++ b/src/PJ_misrsom.c
@@ -1,3 +1,24 @@
+/******************************************************************************
+ * This implements Space Qblique Mercator (SOM) projection, used by the
+ * Multi-angle Imaging SpectroRadiometer (MISR) products, from the NASA EOS Terra
+ * platform.
+ *
+ * The code is identical to that of Landsat SOM (PJ_lsat.c) with the following
+ * parameter changes:
+ *
+ *   ascending longitude = 98.30382 degrees
+ *   period of revolution = 98.88 minutes
+ *   inclination angle = 129.3056 degrees - (360 / 233) * path_number
+ *
+ * and the following code change:
+ *
+ *   P->rlm = PI * (1. / 248. + .5161290322580645);
+ *
+ * changed to:
+ *
+ *   P->rlm = 0
+ *
+ *****************************************************************************/
 /* based upon Snyder and Linck, USGS-NMD */
 #define PROJ_PARMS__ \
     double a2, a4, b, c1, c3; \
-- 
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