Hello, we're using `gdaldem aspect` on polar grid products and we need to convert the grid-oriented directions to compass oriented ones, location-specific directions, where "compass north" is dependent on longitude.
It's easy but inefficient for us to do this after running gdal dem for our polar grids at latitude -90, and a more general solution would require a general approach to "where north is" for any location in a projection. I'll be able to modify GDAL to do this as an option to gdaldem for a simple polar grid (e.g. EPSG:3031), and that will make our use of it much more efficient. Is there any interest in a more general approach? Best, Mike -- Michael Sumner Software and Database Engineer Australian Antarctic Division Hobart, Australia e-mail: mdsum...@gmail.com
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