Terrain Analysis- 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.

First Add the Data (DEM). click Raster, go to your folder, select data and click OK.

add data

Now perform to 6 Terrain Analysis model.

  1. Slope
  2. Aspect
  3. Hillshade
  4. Relief
  5. Ruggedness Index
  6. Contour

Go to Raster> Terrain Analysis and select the Terrain model.

terrain analysis

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).

perform slope
slopeterrain analysis

now you can change slope properties or customize slope. Right click slope layer and select properties.

slope 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.

perform aspect
aspect terrain analysis

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.

perform hillshade
hillshade terrain analysis

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.

perform relief
relief terrain analysis

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.

perform ruggedness
ruggedness terrain analysis

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.

extraction-contour
contour
contour terrain analysis

6 thoughts on “Terrain Analysis”

  1. Portal

    Hi there, just became alert to your blog through Google, and found that its really informative. I’m gonna watch out for brussels. I will appreciate if you continue this in future. Numerous people will be benefited from your writing. Cheers!

    Reply

Leave a Comment

Your email address will not be published. Required fields are marked *