Instructions for Use

Aspect analysis is used to calculate the orientation of the slope surface for each cell in a raster dataset (typically using DEM data). The aspect calculation range is from 0° to 360°, starting at 0° for true north, moving clockwise, and ending at 360° for true north. Flat slopes have no direction and are assigned a value of -1. For the principles of aspect analysis and resampling methods, please refer to the About Surface Analysis section on Slope and Aspect.

Application Example

Open the "Terrain" data source in the "ExerciseData/RasterAnalysis" folder, which contains DEM data with a resolution of 5 meters. We use this data as an example.

Function Entry

• In the Spatial Analysis tab -> Raster Analysis -> Surface Analysis -> Aspect Analysis;
• Toolbox -> Raster Analysis tools -> Surface Analysis -> Terrain Calculation -> Aspect Analysis.

Parameter Description

• Source Data
  • Datasource: Lists all data sources in the current workspace. Select the data source where the dataset for aspect analysis is located.
  • Dataset: Lists all raster datasets (GRID) in the current data source. Select the dataset for slope analysis from the list, typically we choose DEM data with elevation values. This will automatically locate the selected dataset in the workspace manager.
• Result Data
  • Datasource: Lists all data sources in the current workspace. Select the data source for the result dataset. By default, it is the same as the source data source.
  • Dataset: Set the name of the result dataset. The newly generated aspect dataset is the same size and resolution as the source dataset.

Figure: Calculate Aspect Result

Related Topics

About Surface Analysis