Erase
Layer erase refers to the function of using overlay dataset (erase dataset) to remove features overlapping with source dataset (the dataset to be erased). For detailed descriptions of the erase tool, please refer to Overlay Analysis Tools.
Feature Description
- The erase dataset must be a region dataset type. The dataset to be erased can be point, line, or region dataset.
- In the dataset to be erased, only objects outside the erase dataset polygons will be output to the result dataset.
Feature Entry
- Spatial Analysis Tab->Vector Analysis->Overlay Analysis->Erase.
- Toolbox->Vector Analysis->Overlay Analysis->Erase.
Parameter Description
- Source Dataset: Select the datasource and dataset to be erased.
- Overlay Data: Select the datasource containing the erase dataset and the erase dataset itself.
- Result Dataset: Select the datasource to store the result dataset and specify its name.
- Tolerances: Default tolerance values will be automatically provided based on the participating datasets.
After overlay operation, if the distance between two nodes is smaller than this value, they will be merged. The default value is the fuzzy tolerance of the clipped dataset (set in the Fuzzy field under Tolerances in the Vector Dataset Tab of Dataset Properties dialog).
- Compare Results: Enable result comparison by checking the "Compare Results" checkbox. This will display the dataset to be erased, erase dataset, and result dataset simultaneously on a new map for comparison.
Notes:Before performing overlay analysis, ensure consistent projection for all involved datasets, otherwise the overlay analysis may fail.
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