[cig-commits] r5757 - cs/spatialdata-0.1/trunk/libsrc/geocoords

[brad at geodynamics.org]

Author: brad
Date: 2007-01-11 08:31:31 -0800 (Thu, 11 Jan 2007)
New Revision: 5757

Modified:
   cs/spatialdata-0.1/trunk/libsrc/geocoords/Geoid.cc
Log:
Added reference for geoid model.

Modified: cs/spatialdata-0.1/trunk/libsrc/geocoords/Geoid.cc
===================================================================
--- cs/spatialdata-0.1/trunk/libsrc/geocoords/Geoid.cc	2007-01-11 00:31:51 UTC (rev 5756)
+++ cs/spatialdata-0.1/trunk/libsrc/geocoords/Geoid.cc	2007-01-11 16:31:31 UTC (rev 5757)
@@ -83,6 +83,17 @@
 spatialdata::geocoords::Geoid::elevation(const double lon,
 					 const double lat) const
 { // elevation
+  /* Use EGM96 to get difference between MSL and geoid.
+   *
+   * Lemoine, F.G., S.C. Kenyon, J.K. Factor, R.G. Trimmer,
+   * N.K. Pavlis, D.S. Chinn, C.M. Cox, S.M. Klosko, S.B. Luthcke,
+   * M.H. Torrence, Y.M. Wang, R.G. Williamson, E.C. Pavlis, R.H. Rapp
+   * and T.R. Olson, The Development of the Joint NASA GSFC and the
+   * National Imagery and Mapping Agency (NIMA) Geopotential Model
+   * EGM96, NASA Technical Report NASA/TP-1998-206861, NASA Goddard
+   * Space Flight Center, Greenbelt, Maryland, 20771 USA.
+   */
+
   const double lon360 = (lon > 0.0) ? lon : lon + 2*M_PI;
 
   const double xLon = (lon360 - _west + _numExtraEdge*_dLon) / _dLon;