[mkgmap-dev] HGT - getElevation()

Wed Jan 10 15:45:20 GMT 2018

Hi Andrzej,

I can easily change the code to support feet. I think Franks program already supports that.
But what would be the benefit ? Even with 1'' hgt data we have only one data point every ~25 metres (in western europe) giving the height in metres,
I can't believe that we would improve quality by using feet, but runtime and DEM file size are both much higher.

I've justed tested it with my DEMCompressor: Compress 32 1'' files at N60 with metre takes 28 sec and creates ~65M *.DEM files.
Same files with feet requires 32 secs and creates ~105 M *.dem files.

Gerd

________________________________________
Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Andrzej Popowski <popej at poczta.onet.pl>
Gesendet: Mittwoch, 10. Januar 2018 16:14:15
An: mkgmap-dev at lists.mkgmap.org.uk
Betreff: Re: [mkgmap-dev] HGT - getElevation()

Hi Gerd,

no idea about int vs. short, but I wouldn't expect any differences on
Intel CPU.

I think it could be interesting to return interpolated values in feet,
assuming that you can encode whole DEM in feet.

--
Best regards,
Andrzej

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