[Gdal-dev] shaded relief utility

[Ethan Alpert]

As I mentioned previously go to:

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

Turn off all the layers but hillshading and topography.

Zoom in...see how nice and aesthetic it appears. There's no graininess
as you zoom in. This is done by overlaying a partially transparent
topography layer over a *vector* contoured hillshade grid. Toggle the
two remaining layers and you'll see what I'm getting at.

-e

-----Original Message-----
From: gdal-dev-bounces at lists.maptools.org
[mailto:gdal-dev-bounces at lists.maptools.org] On Behalf Of Ben Discoe
Sent: Friday, December 16, 2005 2:41 PM
To: gdal-dev at lists.maptools.org
Subject: RE: [Gdal-dev] shaded relief utility


> -----
> 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



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