[Gdal-dev] shaded relief utility

[Ethan Alpert]

One way to accomplish this is to color a vector topo set and overlay it
with partial transparency over a grey scale hill shade relief.

I believe this is how demis does it. Check out the map server below.
Turn off all layers except hillshading and topography. Zoom in to an
area and toggle one of those two layers. You'll see what I'm talking
about.

http://www.demis.nl/home/pages/wms/demiswms.htm

-----Original Message-----
From: gdal-dev-bounces at lists.maptools.org
[mailto:gdal-dev-bounces at lists.maptools.org] On Behalf Of Paul Surgeon
Sent: Tuesday, December 13, 2005 1:04 PM
To: Brent Fraser
Cc: gdal-dev at lists.maptools.org
Subject: Re: [Gdal-dev] shaded relief utility


On Monday 12 December 2005 23:32, Brent Fraser wrote:
> Paul, Matt,
>
>   And it compiled ok on Windows.  I justed editted the makefile.vc 
> file to include hillshade.exe.  I haven't actually tried it yet.
>
>   Like Paul,  I'm actually interested in shading an image file based 
> on a DEM (if that's what you meant, Paul)
>
> Brent

No, I meant I need a way to make "color scaled relief maps" (or whatever
they 
are called in GIS lingo) from DEMs. The type that has a color gradient
based 
on the altitude.

It's pretty simple so I find it hard to believe no one has written an
open 
source utility to do it. It's just a matter of trying to find out what's

available.

I take it what you're after is a way to modulate an existing base image
with a 
hillshade image generated from a DEM.

Paul
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