[ gpsdrive ] NASA maps

[Hamish]

Rikard Johnels wrote:
> But i am interested in the NASA topology sets as an experiment for a
> search-and-rescue application me and some ppl are tinkering
> with.

you mean topography? do you want elevation or a visual satellite image?
or perhaps shaded relief combining both?


> Which of the maps under http://mirrors.arsc.edu/nasa/ am i
> to use ??

Blue Marble 2002 images there to look at:
 http://mirrors.arsc.edu/nasa/Blue_Marble_2002/
     topo.bathymetry.E.21600x21600.png
     topo.bathymetry.W.21600x21600.png


the ones I downloaded are from Nov 2005. Local filenames are:
  land_shallow_topo_east.tif    401M
  land_shallow_topo_east.wld
  land_shallow_topo_west.tif    241M
  land_shallow_topo_west.wld

(.wld is a "worldfile" providing georeferencing info)


> > > > Is any of the world_500m maps suitable?

as long as you can georeference it, you can use whatever you like.

hmmm, idea. BlueMarble GeoTIFFs + gdal_slice.sh script to make full Blue Marble GpsDrive tileset for all the world.


> > Wasn't there another method where you could
> > download the whole NASA Set and
> > converted it into the two big  (east/west) tiff files
> > which can be used by gpsdrive directly.

see scripts/nasaconv.sh and src/gpsnasamap.c in the source code.
Not sure if it is still functional. It would be nice if it were.


> Thats the two sets i was looking for as described in the
> readme file in the source distribution.
> I couldnt find those two exact files pointed at, hence my
> original question.

do you mean the Documentation/README.nasamaps file?
the filenames listed in that seem to be available at the above URL.
[broken URL now updated in SVN, thanks]


Hamish