How do I obtain lat/lon coordinates of a mouse click?
The GLG Map Server provides coordinate conversion capabilities that are often used to convert x/y image coordinates of the mouse click to lat/lon coordinates on the map. To convert screen coordinates of the point to lat/lon, use the GetFeatureInfo request type with INFO_TYPE=lat_lon. The I and J parameters of the request supply the Y and Y image coordinates of the point of interest, and an optional INFO_FORMAT parameter may be set to either text/xml or text/plain to specify a desired output format. The map image parameters (i.e. with and height, projection, extent, etc.) needs to be supplied as well in order to convert point’s X/Y coordinates to lat/lon location. The map server will respond with the lat/lon coordinates of the point. For example, the following sample coordinate conversion request: http://www.myserver.com/cgi-bin/GlmScript?VERSION=1.3.0&REQUEST=GetFeatureInfo&SRS=AUTO:42003,9001,-97.,38.&WIDTH=400&HEIGHT=400&BBOX=-2500000,-2500000,2500000,2500000&STRETCH=0&QUERY_LAYERS=d
