On Fri, 25 Jun 2021, Michael Sumner wrote:
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.
I am curious; in the terminology of the British Ordnance Survey maps,
you are converting from "Grid North" but are you trying
to convert to "True North" or to "Magnetic North" ?
--
Andrew C. Aitchison Kendal, UK
and...@aitchison.me.uk
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