Feature Description
Extract all polygons, also known as extract all isosurfaces, retrieves all qualified isosurfaces from the specified surface model parameters.
- The source dataset for extracting isosurfaces must be DEM or Grid data.
Application Example
Open the "Terrain" datasource in the "ExerciseData/RasterAnalysis" folder containing 5-meter resolution DEM data. This example uses this dataset for demonstration.
Feature Entry
- Spatial Analysis Tab -> Raster Analysis -> Surface Analysis -> Extract All Isosurfaces;
- Toolbox -> Raster Analysis Tools -> Surface Analysis -> Extract Isolines/Areas -> Extract All Isosurfaces.
Parameter Description
Base Value: The initial reference value for generating isosurfaces. Calculations extend in both directions from this value at specified intervals, meaning it may not represent the minimum isosurface value.
Interval: The elevation spacing between adjacent isosurfaces starting from the base value, using the same unit as the source dataset by default. Combined with the base value, this determines which isosurfaces will be extracted.
After completing parameter settings, the system automatically calculates and displays result information:
Maximum Raster Value: The highest value in the source dataset (system-generated, read-only).
Minimum Raster Value: The lowest value in the source dataset (system-generated, read-only).
Maximum Isosurface: The highest isosurface value in the target dataset.
Minimum Isosurface: The lowest isosurface value in the target dataset.
Isosurface Count: Total number of isosurfaces in the target dataset.
- Configure parameters including source data, target dataset, resampling factor in parameter settings, smoothing method, and smoothness. For common parameters like source data and target dataset settings, see: Common Parameter Description.
- Set base value and interval in parameters.
- Click the OK button to complete the isosurface extraction. Results are shown below:
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| Figure: Extract All Isoregions Result |
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