[gdal-dev] Terrain Analysis

[Markus Neteler]

Hi Camila,

On Tue, Feb 21, 2023 at 5:39 PM Roa Carvajal, Camila via gdal-dev
<gdal-dev at lists.osgeo.org> wrote:
>
> Hi,
>
> Recently I used gdaldem to compute slope and aspect from a Digital Elevation Model. In the past I've used SAGA GIS to compute a more extensive list of terrain parameters but it uses a large amount of memory for heavy raster files. So I'm looking for a program (or scripts) that does the computation with GDAL or an associated project. So far I found some of the computations are implemented in Grass Gis.

FYI:
I have turned your list below into a new overview related to your list
below and what else is possible with GRASS GIS:

https://grasswiki.osgeo.org/wiki/Terrain_analysis

Maybe useful in addition to gdaldem (https://gdal.org/programs/gdaldem.html).

Best,
Markus

-- 
Markus Neteler, PhD
https://www.mundialis.de - free data with free software
https://grass.osgeo.org
https://courses.neteler.org/blog

> I would appreciate any information you can provide.
>
> This is the list of terrain parameters that SAGA computes (https://saga-gis.sourceforge.io/saga_tool_doc/2.1.3/ta_compound_0.html):
>
> Analytical Hillshading
> Slope
> Aspect
> Plan Curvature
> Profile Curvature
> Convergence Index
> Closed Depressions
> Catchment Area
> Topographic Wetness Index
> LS-Factor
> Channel Network Base Level
> Channel Network Distance
> Valley Depth
> Relative Slope Position
>
> Thanks,
>
> Camila Roa
> Graduate Research Assistant @ GCLab
> University of Tennessee
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