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[mkgmap-dev] DEM: performance with bicubic interpolation

From Andrzej Popowski popej at poczta.onet.pl on Tue Jan 23 12:22:01 GMT 2018

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:

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:

Best regards,

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