[ gpsdrive ] Tiles big & small

[Hamish]

gpsdosm wrote:
> I'll be setting up my laptop to use gpsdrive/openmap for
> road, air & skidoo.  I have some very high resolution 
> aerial photos of my immediate area with roads and forest
> trails and am wondering if the current tile system allows 
> a user to incorporate such into the map data?  If so, how 
> would I do that, say in the case of several 1 square-km 
> photos of the order of 4000 pixels? I could mark, crop or 
> posterize them to match one minute or one second arcs.

are the aerial photos georeferenced? ie can gdalinfo read them and say
something useful about their coordinates?

Or are they on some known 1 km^2 grid? (eg UTM) Then you can apply
corner coordinates and coordinate system metadata with gdal_translate.

If so, then you can use gdal_slice.sh to make the tiles. See the other
thread about Nautical Charts for that.

If not, you can do harder manual orthophoto georeferncing from road
overlays, etc.



Hamish



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