[mkgmap-dev] HGT - getElevation()

Sun Jan 21 13:13:00 GMT 2018

Hi Andrzej,

did not try it yet but I think the method fillArray is off by one. Bicubic expects grid [-1,0,1,2] X [-1,0,1,2]
fillArray  uses [0,1,2,3]X[0,1,2,3]

Gerd

________________________________________
Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Andrzej Popowski <popej at poczta.onet.pl>
Gesendet: Samstag, 20. Januar 2018 00:50:19
An: mkgmap-dev at lists.mkgmap.org.uk
Betreff: Re: [mkgmap-dev] HGT - getElevation()

Hi Gerd,

I have included bicubic interpolation created by Ken Perlin:
https://github.com/mlevans/pretty-heatmaps/blob/master/DensityArrayCreation/src/DensityArrayCreation/Bicubic.java

Bicubic interpolation is used only for layers with good resolution (3
arc seconds or better). For other cases bilinear interpolation is used.

Patch is attached.

--
Best regards,
Andrzej