[mkgmap-dev] [PATCH] support of DEM subfile for Displayer

Thu Sep 23 22:18:06 BST 2010

This patch enables the display tool to read the known parts of DEM 
subfiles.
Please refer to 
http://wiki.openstreetmap.org/wiki/OSM_Map_On_Garmin/DEM_Subfile_Format 
for a description.

Notes:
- Using the discovered parts it is possible to read the coordinates of 
the covered areas, their minimum and maximum heights and the data which 
builds the real elevation model.
- The encryption of this data is still unknown. IMHO it is normalized 
(using the difference between minimum and maximum height and perhaps an 
additional field) and compressed. But I'm not an expert on data 
encrytion ;-)
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