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[mkgmap-dev] one mistake less in DEM

From Gerd Petermann gpetermann_muenchen at hotmail.com on Tue Jan 9 15:00:25 GMT 2018

Hi Frank,

I've already noticed it some hours ago and tested the changes in mkgmap. Commetted with r4041. See


Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Frank Stinner <frank.stinner at leipzig.de>
Gesendet: Dienstag, 9. Januar 2018 11:40:33
An: mkgmap-dev at lists.mkgmap.org.uk
Betreff: [mkgmap-dev] one mistake less in DEM


there is a new BuildDEMFile-version with a rectified encoder. This should help on maps with strong changes in height.

East 79,335° / North 42,554°, PointDistance 55000 -> 0,004610°

Hi Gerd,
there seems to be a limitation for my variable "sumH" for the calculation of hunit. Perhaps garmin use only a 2-byte-var. I have included in CodingTypeStd.addValue() after "SumH += dh;":

if (SumH + unitdelta + 1 >= 0xFFFF)
   SumH -= 0x10000;

I have no idea, why not "if (SumH + unitdelta > 0xFFFF)" or so.
I have done the same with CodingTypePlateauFollowerNotZero.AddValue() and CodingTypePlateauFollowerZero.AddValue().


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