Feature Description
Used to calculate the union of two region datasets, performing intersection and splitting operations on the overlapping parts. The result dataset will retain the geometries and attributes of both datasets. For details, please refer to the overlay analysis introduction.
Function Entry
- Toolbox->Vector Analysis->Overlay Analysis->Union.
- Spatial Analysis tab->Vector Analysis->Overlay Analysis->Union.
Parameter Description
- Source Data: Select the region dataset used for overlay analysis and the datasource where it is located.
- Overlay Data: Select the region dataset to be overlaid (unioned) for analysis and the datasource where it is located.
- Tolerances: Based on the datasets involved in the analysis, default tolerance values will be automatically provided.
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 fuzzy default 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 the tolerance description.
- Result Data: Set the datasource and name for storing the result dataset.
- Reserved Fields: Set the property fields to be retained in the overlay analysis result dataset. Click this button to enter the field settings dialog box, where you can set the fields to retain by checking the checkboxes in front of the fields.
- Keep All Source Data Fields: Used to set whether to retain all fields of the source data. If the source data and overlay data have fields with the same name, the field in the result dataset from the source data will be named "Field Name_1", and the field from the overlay data will be named "Field Name_2".
- Keep All Overlay Data Fields: Used to set whether to retain all fields of the overlay data. If the source data and overlay data have fields with the same name, the field in the result dataset from the source data will be named "Field Name_1", and the field from the overlay data will be named "Field Name_2".
Related Topics