Feature Description
Slope analysis calculates the slope value of each cell in a raster dataset (typically using DEM data). Higher slope values indicate steeper terrain, while lower values represent flatter areas.
In DEM data, cell values represent elevation. SuperMap computes the average slope value of each cell plane and provides three measurement units: degree, radian, and percentage. For principles and resampling methods, refer to the Slope and Aspect section in About Surface Analysis.
Caution:Data in geographic coordinate systems cannot directly undergo slope analysis. Convert data to projected coordinate systems using data conversion first.
Example
Open the "Terrain" datasource in the "ExerciseData/RasterAnalysis" folder containing 5-meter resolution DEM data for demonstration.
Feature Entry
- Spatial Analysis Tab -> Raster Analysis -> Surface Analysis -> Slope Analysis
- Toolbox -> Raster Analysis Tools -> Surface Analysis -> Terrain Calculation -> Slope Analysis
Parameter Description
- Source Data
- Datasources: Lists all datasources in the current workspace. Select the datasource containing the input dataset.
- Dataset: Displays all raster datasets (GRID) in the selected datasource. Choose the DEM dataset with elevation values. Automatically locates to the dataset selected in Workspace Manager.
- Parameter Settings
- Slope Unit Type: Select measurement units - Degree, Radian, or Percentage.
- Z Factor: Controls vertical exaggeration. Higher values amplify terrain features (1=no exaggeration). Represents elevation scaling multiplier.
- Result Settings
- Datasources: Select output datasource. Default matches source datasource.
- Dataset: Name the output dataset. Generates a slope dataset matching the source's extent and resolution.
- Execute slope analysis to obtain results as shown:
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| Figure: Slope calculation result |
Related Topics