November 2018
Beginner to intermediate
272 pages
5h 36m
English
Content preview from Learn QGIS - Fourth Edition
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Analyzing elevation/terrain data
To use terrain analysis tools, we need an elevation raster. If you don't have a DEM to hand, you can simply download a dataset from the NASA Shuttle Radar Topography Mission (SRTM) using http://dwtkns.com/srtm/ or any other SRTM download services.
If you want to replicate the results in the following exercise, then download the dataset called srtm_05_01.zip, which covers a small part of Alaska.
Raster terrain analysis can be used to calculate Slope, Aspect, Hillshade, Ruggedness Index, and Relief from elevation rasters. These tools are available from the processing toolbox.
Analysis includes some of the following tools:
- Aspect: This tool calculates the exposition (in degrees and counterclockwise, starting ...
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