Index: /issm/trunk-jpl/src/m/plot/plot_googlemaps.m
===================================================================
--- /issm/trunk-jpl/src/m/plot/plot_googlemaps.m	(revision 22290)
+++ /issm/trunk-jpl/src/m/plot/plot_googlemaps.m	(revision 22291)
@@ -85,4 +85,26 @@
 image_rgb = ind2rgb(uint16((data_grid - data_min)*(length(colorm)/(data_max-data_min))),colorm);
 
+if exist(options,'shaded'),
+	a    = -45;
+	scut = 0.2;
+	c    = 1;
+	% computes lighting from elevation gradient
+	[fx,fy] = gradient(data_grid,x_m,y_m);
+	fxy = -fx*sind(a) - fy*cosd(a);
+	clear fx fy % free some memory...
+	fxy(isnan(fxy)) = 0;
+
+	% computes maximum absolute gradient (median-style), normalizes, saturates and duplicates in 3-D matrix
+	r = repmat(max(min(fxy/nmedian(abs(fxy),1 - scut/100),1),-1),[1,1,3]);
+
+	% applies contrast using exponent
+	rp = (1 - abs(r)).^c;
+	image_rgb = image_rgb.*rp;
+
+	% lighter for positive gradient
+	k = find(r > 0);
+	image_rgb(k) = image_rgb(k) + (1 - rp(k));
+end
+
 alpha=ones(size(data_grid));
 alpha(find(~data_nan))=transparency;