[mkgmap-dev] DEM Noddy Guide

Tue Jan 9 08:14:14 GMT 2018

Hi Gerd,

Just come across a misleading error message:

SEVERE (HGTReader): F:\garmin\maps\ukraine\12345700.osm.pbf:
  does not exist
Number of MapFailedExceptions: 0
Number of ExitExceptions: 0

The pbf existed, as it produced the map with out DEM !

However,some of the .hgt files were missing which caused the error.

Just a minor point

r

Nick

On 09/01/2018 06:09, Gerd Petermann wrote:
> Hi all,
>
> I did not note this before, but there is probably a typo in this description:
> overview-dem-dist=888888 is far too high, I assume Arndt meant 88888.
>
> Besides that I think there is need to use --dem-poly in combination with the poly file created by splitter.
> This poly file just describes the outer boundaries of the tiles, and mkgmap calculates this polygon anyway.
> The --dem-poly can be used with the rather complex *.poly files from geofabrik. I've tested with bolivia.poly which has 1176 nodes
> and the additional tests for the polygon bounds did not take long. Still, you may want to draw your own simpler poly files because those from
> geofabrik are rather close to country borders.
>
> Gerd
>
> ________________________________________
> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Arndt Röhrig <arndt at speichenkarte.de>
> Gesendet: Freitag, 5. Januar 2018 21:41:57
> An: Development list for mkgmap
> Betreff: Re: [mkgmap-dev] DEM Noddy Guide
>
> Hi Mike,
>
> it´s simple:
>
> - Download hgt files )*
>
> - give mkgmap the option x-dem=path to the hgt files
>
> - x-dem-dists=3314,4000,6000,8000,10000,15000 (maybe other values are better)
>
> 1 value for each level (options file: exampel levels = 0:24, 1:23, 2:22, 3:21, 4:20, 5:19)
>
> - x-overview-dem-dist=888888 writes DEM to the overviewmap (maybe other value is better)
>
> - x-dem-poly=path to a poly file  for example areas.poly from splitter result.
>
> That´s all.
>
> )* hgt files are downloadable here: http://www.viewfinderpanoramas.org/dem3.html
>
> I use phyghtmap to create SRTM contourlines as .pbf. the program download hgt files from viewfinderpanoramas to build the pbfs. After that you find a folder hgt on your pc with hgt files inside.
>
> http://katze.tfiu.de/projects/phyghtmap/
>
>
> Greetings
>
> Arndt
>
>
> Mike Baggaley hat am 5. Januar 2018 um 21:19 geschrieben:
>
>
> Hi all,
>
> I've been following the discussions of DEM with interest, but have so far
> not attempted to create a map including this. Is there a guide to the steps
> involved in producing the DEM data? I have contour data in OSM format - is
> there a simple way to get this into a suitable input format (or is there a
> specification of the input format available, so I can knock up something to
> convert it)? I'm assuming that the height data contains the same information
> as contour data but in a different format.
>
> Thanks,
> Mike
>
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