[gdal-dev] Dealing with SRTM! v3 files

[Carlos Dávila]

Hello all

I want to process SRTM1 data from Earthexplorer using mkgmap 
<http://www.mkgmap.org.uk/>, an open source software to build Garmin 
maps from OpenStreetMap data. Currently, earthexplorer serves SRTM1 data 
as *.tiff files of 3601x3601x2=24,7 MB, but also as files of half that 
size. I use gdal to convert *.tiff to *.hgt, as mkgmap is not able to 
read *.tiff.

These smaller files seem to contain the same information and gdal is 
able to convert them to *.hgt files without problems, in the same way 
than standard size ones, but mkgmap fails to read the small hgt files. 
Given gdal "understands" these small srtm files, could you give me some 
clue on how it is done, so that developers of mkgmap can add this 
capability?

Thanks in advance for any help

Carlos

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