identify (same)
Function Description
identify (same) refers to performing an intersection operation between the source dataset and the overlay dataset. For details, please refer to Overlay Analysis Introduction.
Function Entry
- Spatial Analysis tab -> Vector Analysis -> Overlay Analysis -> Identify (Same).
- Toolbox -> Vector Analysis -> Overlay Analysis -> Identify (Same).
Parameter Description
- Source Data: Select the source dataset and its datasource for the "Same" operation.
- Overlay Data: Select the dataset and its datasource to perform the "Same" operation with the source dataset.
- Keep Overlaps of Source Data: When the topology of both polygon datasets is complex, for example, when there are polygon overlaps in both the source data and the overlay data, check this parameter to output results according to the overlap relationships of the source data. For instance, if both the source data and the overlay data have two layers of polygon overlap, the output result objects will have four layers of overlap when unchecked, but will maintain the source data's two layers of overlap when checked, ensuring correct results.
- Tolerances: Default tolerance values are automatically provided based on the datasets involved in the analysis.
After the overlay operation, if the distance between two nodes is less than this value, the two nodes will be merged. The default value of this parameter is the default fuzzy value of the clipped dataset, which can be set under fuzzy in the Tolerances section of the Vector Dataset tab in the Dataset Properties dialog box.
If fuzzy is not set in the Dataset Properties, the default tolerance here is related to the coordinate system of the dataset. For details, please refer to Tolerance Description.
- Result Data: Select the datasource to store the result dataset and specify the name of the result dataset.
- Field Settings: Select fields from the source dataset and the overlay dataset as the fields of the result dataset.
- Keep All Source Data Fields: Check the checkbox to retain all fields from the source data. If the source data and the overlay data have fields with the same name, the field from the source data in the result dataset will be named "FieldName_1", and the field from the overlay data will be named "FieldName_2".
- Keep All Overlay Data Fields: Check the checkbox to retain all fields from the overlay data. If the source data and the overlay data have fields with the same name, the field from the source data in the result dataset will be named "FieldName_1", and the field from the overlay data will be named "FieldName_2".
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