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Hi Ying, Sorry to not get back to you before now... Further investigation of the GeoTIFF images created by McIDAS shows that the navigation is specified as 'user defined'. This is why the GeoTIFF images are not automatically recognized by things like ArcMAP. After fully installing ArcGIS 9.2 beta at the UPC we were able to load one of the national total precipitation (NTP) GeoTIFFs created on your machine in one layer and then display a correctly navigated map in another layer. The tricky part for us (given that we are not knowledgable in ArcXXX) was learning how to turn off all map features that we did not want and set the transparency so that the precipitation features from the NTP GeoTIFF were visible. Aside: we were unable to display a map using ArcMAP 9 because we did not have the various Arc*** map/census/etc. databases installed on our server. Since we did not load the databases before upgrading to v9.2 beta, I can not say whether we would have been able to display the GeoTIFF images and map using v9. I sent in an inquiry to SSEC asking why the navigation geo tags were set to user defined when the McIDAS RECTilinear projection appears to be the same as one supported by ArcGIS. Again, the McIDAS RECTilinear projection is a simple Lat,Lon map, so it should be easily incorporated into the various GIS packages that are available. Cheers, Tom **************************************************************************** Unidata User Support UCAR Unidata Program (303) 497-8642 P.O. Box 3000 address@hidden Boulder, CO 80307 ---------------------------------------------------------------------------- Unidata HomePage http://www.unidata.ucar.edu **************************************************************************** Ticket Details =================== Ticket ID: MHL-637032 Department: Support McIDAS Priority: Normal Status: Open