Index: /issm/trunk-jpl/src/m/coordsystems/ll2mercator.m
===================================================================
--- /issm/trunk-jpl/src/m/coordsystems/ll2mercator.m	(revision 15143)
+++ /issm/trunk-jpl/src/m/coordsystems/ll2mercator.m	(revision 15144)
@@ -7,5 +7,4 @@
 EARTH_RADIUS = 6378137;
 EQUATOR_CIRCUMFERENCE = 2 * pi * EARTH_RADIUS;
-INITIAL_RESOLUTION = EQUATOR_CIRCUMFERENCE / 256.0;
 ORIGIN_SHIFT = EQUATOR_CIRCUMFERENCE / 2.0;
 
Index: /issm/trunk-jpl/src/m/coordsystems/mercator2ll.m
===================================================================
--- /issm/trunk-jpl/src/m/coordsystems/mercator2ll.m	(revision 15144)
+++ /issm/trunk-jpl/src/m/coordsystems/mercator2ll.m	(revision 15144)
@@ -0,0 +1,13 @@
+function [lat lon]=mercator2ll(mx,my),
+%LL2MERCATOR - transform mercator projection to lat/lon
+%
+%   Usage:
+%      [lat lon]=mercator2ll(mx,my)
+
+EARTH_RADIUS = 6378137;
+EQUATOR_CIRCUMFERENCE = 2 * pi * EARTH_RADIUS;
+ORIGIN_SHIFT = EQUATOR_CIRCUMFERENCE / 2.0;
+
+lon = mx * 180.0 / ORIGIN_SHIFT;
+lat = my * 180.0 /ORIGIN_SHIFT;
+lat = 180.0/pi*(2.0*atan(exp(lat*pi/180.0))-pi/2.0);