Hi Gerd,
I have executed your script and looked at maps. I have tested them with
artificial HGT too. Only the original-unaligned map has DEM at wrong
position. It is moved by about 0.00033 degree right and down.
I looked at offset calculated as (DEM coordinate)%(dem-dist) and only
for this map, offset was bigger than half of dem-dist. Any attempt to
align HGT with data reduce this offset, but it still remain quite big,
like 1300-3600, while dem-dist is 9942.
My guess is, that Mapsource/BaseCamp calculate DEM pixel positions
globally, basing on dem-dist. If coordinates of DEM layers aren't
aligned with with dem-dist and misalignment is too big, than Mapsource
can fetch wrong DEM values.
--
Best regards,
Andrzej
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