On 6/3/19 1:21 PM, Bald Eagle wrote:
> 
> Hey Yadgar,
> 
> I got my elevation data from here:
> 
> https://tangrams.github.io/heightmapper/#2/-0.2/0.4
> 
> SUPER convenient.
...
> 

Cool & thanks for posting the link. I played & another reminder people 
are creating some interesting web sites on Github! I didn't try to 
output images. Saw Yadgar's comment about the 8 bit depth. Data volume / 
performance / display reasons I suppose.

The plane generated lidar data I found at Penn State years back was 
sitting at 19 bits. I remember hacking together code to translate to 
special 3 channel ppm files interpreted then by SDL functions as single 
grey scale values. I also installed and used GRASS for some conversions.

https://grass.osgeo.org/screenshots/lidar/

It does seem always to be a job to find what elevation data is available 
at any given time - then how to make use of it. Partly a problem of not 
doing it day to day I guess. Heck, my well aged brain struggles coming 
back to features of POV-Ray I've not recently used! :-)

Bill P.

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