From: Andy Spencer <andy753421@gmail.com>
Date: Fri, 12 Feb 2010 18:10:58 +0000 (+0000)
Subject: Update to ll2m
X-Git-Tag: v0.4~31
X-Git-Url: http://pileus.org/git/?p=grits;a=commitdiff_plain;h=e7367efa416d0084899bd17f01b15cb351a44097;hp=e589cb4bee133b2df34853fbbcc24355e1f2f4c9

Update to ll2m
---

diff --git a/src/gis-util.c b/src/gis-util.c
index 951b452..f748cd2 100644
--- a/src/gis-util.c
+++ b/src/gis-util.c
@@ -191,9 +191,9 @@ void xyz2ll(gdouble x, gdouble y, gdouble z,
  */
 gdouble ll2m(gdouble lon_dist, gdouble lat)
 {
-	gdouble azim = (-lat+90)/180*M_PI;
-	gdouble rad  = sin(azim) * EARTH_R;
-	gdouble circ = 2 * M_PI * rad;
+	gdouble incl = lat2incl(lat);
+	gdouble rad  = sin(incl) * EARTH_R;
+	gdouble circ = 2 * G_PI * rad;
 	return lon_dist/360 * circ;
 }