[mkgmap-dev] DEM: performance with bicubic interpolation

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:
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