Index: /issm/trunk-jpl/src/m/plot/webgl.js
===================================================================
--- /issm/trunk-jpl/src/m/plot/webgl.js	(revision 19906)
+++ /issm/trunk-jpl/src/m/plot/webgl.js	(revision 19907)
@@ -33,6 +33,6 @@
 
 	// Add context state variables
-	canvas.zoomFactor = options.getfieldvalue('zoomfactor',-.52);
 	canvas.zoomBounds = options.getfieldvalue('zoombounds',[0,-.52]);
+	canvas.zoomFactor = Math.max(canvas.zoomBounds[1], Math.min(options.getfieldvalue('zoomfactor',canvas.zoomBounds[1]), canvas.zoomBounds[0]));
 	canvas.cameraMatrix = mat4.create();