Hi Gerd,
there are different kind of bicubic interpolations. I'm not good at this
math, I think the previous version was actually bicubic spline
interpolation. See other possibilities here:
http://mrl.nyu.edu/~perlin/cubic/Cubic_java.html
I don't know, which type of spline or cubic interpolation is best for
DEM. Maybe differences aren't big, but I think it is better to have good
interpolation than fast one. You compile a map once but then many people
can use it.
It shouldn't be difficult to include an option like:
--dem-interp=..
--
Best regards,
Andrzej
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