[Gdal-dev] shaded relief utility

[Ben Discoe]

> -----
> From: Ben Discoe
> Sent: Thu 12/15/2005 7:26 PM
> 
> The free VTP software (built on top of GDAL) does all this 
> already.  It does hillshading of existing imagery from a DEM, 
> produces 'color relief maps' [...]

> -----
> From: Ethan Alpert [mailto:ealpert at digitalglobe.com] 
> Sent: Friday, December 16, 2005 5:37 AM
> 
> Does it export closed polygons or pixels or both?

Everything is rasters, so i suppose the answer is "pixels".  I'm not certain
where polygons would play a role in hillshading, unless the source data was
only available in contour form, or the output needs to be at a higher pixel
resolution than the input heixel resolution.  In that case, using extracted
contours seems like it would suffer from similar artifacts as supersampling
the input grid, so i'm not sure if there's an advantage there.

-Ben