X-Git-Url: http://pileus.org/git/?p=grits;a=blobdiff_plain;f=src%2Fgis-util.h;h=b2457b093d3f0d7bd23b1f85db70dfff265c3a8c;hp=a9f288a35b85f2554813355d6abfdeb770d65737;hb=c2e39b9d64035038a19d753129cc2124b4ed1382;hpb=921d317225e75527d6f1d9fdc96b2fd1fb3f6840

diff --git a/src/gis-util.h b/src/gis-util.h
index a9f288a..b2457b0 100644
--- a/src/gis-util.h
+++ b/src/gis-util.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2009 Andy Spencer <spenceal@rose-hulman.edu>
+ * Copyright (C) 2009-2010 Andy Spencer <andy753421@gmail.com>
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -19,7 +19,7 @@
 #define __GIS_UTIL_H__
 
 #define EARTH_R (6371000)
-#define EARTH_C (2*M_PI*EARTH_R)
+#define EARTH_C (2*G_PI*EARTH_R)
 #define NORTH  90
 #define SOUTH -90
 #define EAST  180
@@ -65,15 +65,15 @@
  * xyz2lle:    0.0,   0.0,  10.0 ->    0.0,   0.0,   0.0
  */
 
-#define azim2lon(azim) ((azim)*180/M_PI)
-#define lon2azim(lon)  ((lon)*M_PI/180)
-#define incl2lat(incl) (90-(incl)*180/M_PI)
-#define lat2incl(lat)  ((90-(lat))*M_PI/180)
+#define azim2lon(azim) ((azim)*180/G_PI)
+#define lon2azim(lon)  ((lon)*G_PI/180)
+#define incl2lat(incl) (90-(incl)*180/G_PI)
+#define lat2incl(lat)  ((90-(lat))*G_PI/180)
 #define rad2elev(rad)  ((rad)-EARTH_R)
 #define elev2rad(elev) ((elev)+EARTH_R)
 
-#define deg2rad(deg) (((deg)*M_PI)/180.0)
-#define rad2deg(rad) (((rad)*180.0)/M_PI)
+#define deg2rad(deg) (((deg)*G_PI)/180.0)
+#define rad2deg(rad) (((rad)*180.0)/G_PI)
 
 #define FOV_DIST   2000.0
 #define MPPX(dist) (4*dist/FOV_DIST)
@@ -91,4 +91,6 @@ gdouble ll2m(gdouble lon_dist, gdouble lat);
 
 gdouble distd(gdouble *a, gdouble *b);
 
+gdouble lon_avg(gdouble a, gdouble b);
+
 #endif