Generated using custom software (jDem846; not yet released) I have written in Java using algorithms derived from my earlier masters thesis software. The data is from NOAA ETOPO1 land elevation and ocean bathymetry at 1 arc minute.
The software is not yet feature complete as I plan to add support for ESRI shapefiles, additional raster input formats, and some limited three-dimensional rendering options.
The full sized image (~120MB) is available upon request.
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