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Alan, I have created both 30 second and 5 minute global topography (dem) data sets. The 5 minute dem data has bathymetry, while the 30 second data set does not. I provide these as a grid (http://www.unidata.ucar.edu/downloads/gempak/tables/) for use with a program I call GDTOPO which allows users to create a subset for a Gempak grid file. However, it would be possible to map the grid into an image to use as a background using the same grid to image conversion that I do for our radar composite images. If you can provide some information regarding the resolution (pixel-->km) you need, I can look into making some background images. Steve Chiswell Unidata User Support On Tue, 2007-01-09 at 10:50 -0500, Alan Robson wrote: > Hi Mr Chiswell, > > My name is Alan Robson and I work in the Development and Training Branch > of the Hydrometeorological Precipitation Center in Camp Springs, > Maryland. I am not sure if you the right person to address this > request to and hope you will forward it to the appropriate individual if > you are not. > > We produce many meteorological products for our webpage ( > http://www.hpc.ncep.noaa.gov/ ) that use a fairly low resolution > topographic gempak sat file as a background. This is a sample of one > of our most popular products that gets very many webhits: > http://www.hpc.ncep.noaa.gov/noaa/noaa.gif > > We are currently attempting to improve the appearance of our products > and need to find a higher resolution version of the topographic gempak > satellite file to use as a background. > > Can you help us or give me the name of someone who can? > > Thanks > > Alan Robson > HPC/NCEP > Camp Springs, MD > -- Steve Chiswell <address@hidden> Unidata