Update
Layer update refers to the function where the overlay dataset (update dataset) replaces the overlapping areas with the source dataset (updated dataset). For detailed introduction of overlay tools, please refer to Overlay Analysis Tools.
Feature Description
- Both the update dataset and updated dataset must be region datasets.
- The overlapping parts between the updated dataset and update dataset will be replaced and saved in the result dataset.
Feature Entry
- Toolbox->Vector Analysis->Overlay Analysis->Update.
Parameter Description
- Source Dataset: Select the datasource containing the updated dataset and the dataset to be updated.
- Overlay Data: Select the datasource containing the update dataset and the update dataset.
- Tolerances: 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, which can be set in the Fuzzy field under Tolerances of the Vector Dataset Tab in the Dataset Properties dialog.
If fuzzy tolerance is not set in Dataset Properties, the default tolerance here depends on the dataset's coordinate system. For details, please refer to Tolerance Description.
- Result Dataset: Select the datasource to store the result dataset and specify its name.
Notes:Before performing overlay analysis, ensure the datasets have consistent projections, otherwise the overlay analysis may fail.
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