[Gdal-dev] PNG Heightfield

[Matt Wilkie]

J Douglas Gough wrote:

> I would like to create a heightfield from an ArcInfo grid.  So far, I
> have successfully converted an elevation grid to a 16 bit grayscale PNG
> using gdal_translate.  I can see the difference in brightness
> correleates to height, but I'm stuck here.  I'm thinking I'll need to
> create a pallette and lookup table so there are 65,536 possible values.
> That should give me plenty of room to account for -5000 to +5000 meters
> or some other range that covers the min/max elevation in meters for any
> given point.  Just looking for some tips or examples.  

What program(s) are going to use the png-heightfield? Something like 
Virtual Terrain Project or World Construction Set can use them as-is 
where-is (there are probably others, these are just the ones I've used 
16bit images as DEMs with). If this for a program you are developing the 
source code for VTP should help.

cheers,

-- 
matt wilkie
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