Hi Frank OK, I understand. I even experimented with your 'unknown bytes' at 0x1b and 0x25 but filling these with data didn't seem to visually make a difference. I was hoping they contained the colour of the shading, which is always set to black ! One more thing : How useful are the --width and --height options , do they tweak the dlon or dlat values? r Nick On 04/11/2017 08:39, Frank Stinner wrote:
Hi Nick,
i believe there is no way to change the shading. DEM files include only the strong compressed height data. That means, we have only coordinates for that points and their height. The shading makes the software on pc or gps.
2) yes, you can create more zoomlevels. That is necessary for gps because on gps every zoomlevel is visible for a few zoom's. I think, you should have for every maplevel (see options-file in mkgmap-style) its own zoomlevel.
--dlon and --dlat is the distance between the points. Normally --dlon == --dlat, thats why you can omit --dlat. --dlon=0 is senseless, that means: no distance between the points.
For more zoomlevels use multiple --dlon. The values are experimental: BuildDEMFile ... --dlon=0.00027761 --dlon=0.00049 --dlon=0.00075 --dlon=0.00106 --dlon=0.0017 --dlon=0.0025
Frank
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