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QGIS User Guide - OSGeo Download Server

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12.15. Raster Terrain Modelling Plugin<br />

12.15 Raster Terrain Modelling Plugin<br />

The Raster Terrain Modelling plugin can be used to calculate the slope, aspect, ruggedness, and<br />

total curvature for digital elevation models (DEM). It is very simple to handle and provides an intiuitive<br />

graphical user interface for creating new raster layers (See Figure 85). The plugin requires the<br />

following parameters to be specified before running:<br />

• Analysis: Can be one of slope, aspect, ruggedness, or total curvature<br />

• Input layer: Specify the input raster from a list of loaded raster layers.<br />

• Output layer: Specify a name and path for the output raster file.<br />

• Output format: Specify a format type for the output raster file (Default is GeoTiff).<br />

Slope: Calculates slope angle for each cell in degrees (based on first order derivative estimation).<br />

Aspect: Exposition (starting with 0 for north direction, in degrees counterclockwise).<br />

Ruggedness factor: A quantitative measurement of terrain heterogeneity.<br />

Total curvature: A curvature measure that combines plan- and profile curvature.<br />

Figura 85: Raster Terrain Modelling Plugin<br />

<strong>QGIS</strong> 1.4.0 <strong>User</strong> <strong>Guide</strong> 201

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