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[mkgmap-dev] HGT - getElevation()

From Gerd Petermann gpetermann_muenchen at hotmail.com on Wed Jan 10 16:39:53 GMT 2018

Hi Andrzej,

if you want to try this:
you can easily change the code in interpolatedHeight to return the height in feet, just make sure that you don't convert UNDEF.

The only other change that is needed is  in this line in DemHeader:
writer.putInt(0); // 0: elevation in metres, 1: foot

well, the comment should say feet , not foot


Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Frank Stinner <Frank.Stinner at kabelmail.de>
Gesendet: Mittwoch, 10. Januar 2018 17:27:22
An: mkgmap-dev at lists.mkgmap.org.uk
Betreff: Re: [mkgmap-dev] HGT - getElevation()

Hi Gerd and Andrzej,

i think "overkill" is a good word.

For algorithm that'a only numbers, it does not matter. The questions is, how exact are the hgt-values. We don't know that, but i don't believe it is
+-1m or so. I'm not wondering, when the hgt's have +-5m or +-10m. The copernicus-data have +-7m and i don't believe the technic was worse.

That's why feets are overkill. The numbers are 3 times greater, that's why the dem's are greater. It's not worth it.


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