Terrain Analysis in QGIS
Terrain Analysis is the interpretation of topographic features through Geographic Information Systems. Such features include Slope, Aspect, Viewshed, Elevation, Contour lines, flow, upslope flowlines, and downslope flowlines. It is relationships between ecological processes and physical features.
Terrain is a involves the vertical and horizontal dimensions of land surface. In this Tutorial you will use Terrain Analysis tools to find out more about the surface.
Go to Raster > Terrain Analysis and select the Terrain model.
Table of Contents
Slope
Open Slope, slope window is appears select Elevation layer and Output layer, Output format default is GeoTIFF is ok, Type Z factor (300) and click ok.
(Z factor- Difference between Horizontal and Vertical Height).
Now you can change slope properties or customize slope. Right click slope layer and select properties.
Aspect
Open Aspect, Aspect window is appears select Elevation layer and Output layer, Output format default is GeoTIFF is ok, Type Z factor (300) and click ok.
Hillshade
Open Hillshade, Hillshade window is appears select Elevation layer and Output layer, Output format default is GeoTIFF is ok, Type Z factor (300). you’ill also change Azimuth and Angle and click ok.
Relief
Open Relief, Relief window is appears select Elevation layer and Output layer, Output format default is GeoTIFF is ok, Type Z factor (300) and click ok.
Ruggedness Index
Open Ruggeedness, Ruggeedness window is appears select Elevation layer and Output layer, Output format default is GeoTIFF is ok, Type Z factor (300) and click ok.
Contour
Perform Contour, select Raster > Extraction and click contour. Open Contour, Contour window is appears, Select Input file and Output file, Input contour interval (100) and click ok.
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