When performing raster analysis, it's essential to clarify the environment settings to achieve expected results. The analysis environment configuration significantly impacts raster analysis outcomes.
The analysis environment includes three key parameters: geographic range of result dataset, effective analysis area, and default cell size.
Current analytical functions requiring environment configuration include: vector-raster conversion, distance raster analysis, interpolation analysis, raster algebraic operations, line-of-sight analysis, and raster generalization (e.g., raster reclassification, resampling).
Parameter Description
- Result Bounds
The geographic range of result data is defined by a rectangular area determined by four coordinate values (left, bottom, right, top). By default, this range uses the intersection of all input datasets.
Adjust result bounds in analysis environment when needing to expand or reduce analysis scope.
Four configuration methods are available:
- Custom Bounds: Manually input left/bottom/right/top coordinates, or use copy/paste buttons for quick setup.
- Intersection of All Datasets: Automatically uses overlapping area of all input datasets.
- Union of All Datasets: Automatically uses combined area of all input datasets.
- Use Specified Dataset Bounds: Uses geographic range from selected dataset.
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Effective Analysis Area
When requiring output within specific vector polygon areas, select vector region dataset to define analysis scope. Example: Using provincial boundary vector data to limit national DEM processing results to a specific province.
- Datasources: Select datasource containing effective analysis area vector dataset.
- Dataset: Specify effective analysis area vector dataset.
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Default Cell Size
Output resolution determines cell size for new raster/image datasets. This parameter can be set to any value, with default being maximum resolution of input datasets.
Configuration methods:
- Max resolution of all datasets: Uses largest cell size from input data
- Min resolution of all datasets: Uses smallest cell size from input data
- Use specified dataset resolution: References resolution from selected dataset
- Custom resolution: Manually enter cell size value
Caution:Parameter list resolution settings take precedence. Environment resolution only applies when parameter list resolution is set to 0.
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Reset
The reset button clears custom geographic layer bounds and output resolution settings, restoring default configurations.
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Set Global Variables
Supports configuring environment parameters as global settings. These settings will apply to all raster analysis functions with environment parameter support, eliminating repetitive configurations.
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