Hi Gerd,
thanks for option. I have prepared a set for tests:
http://files.mkgmap.org.uk/download/407/interpolation.7z
This set creates maps with different resolutions and interpolations. I
have created a direct route and compared height profiles created with
different maps. Here my observations:
- I can't see any difference between bicubic and bicubic-spline.
- Oversampling with DEM resolution twice the resolution of HGT improve
look of height profile. It improves shading too.
- I have looked at maximum and minimum height of profile. I noticed
differences in range 2-6m between bilinear and bicubic interpolation for
3" HGT.
My suggestion: use bicubic version. If size is not a problem, try some
oversampling.
--
Best regards,
Andrzej
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