Function Description
Union (Merge) refers to the function of performing union operation on multiple Datasets. Please refer to the Introduction to Overlay Analysis for details.
Function entrance
- Toolbox-> Vector Analysis-> Overlay Analysis-> Union (Merge);
- Spatial Analysis tab-> Vector Analysis-> Overlay Analysis-> Union (Merge);
Parameter Description
- Source Data: Select the Source Dataset used by Overlay Analysis and the Datasource where it is located.
- Save Type: The type of the Overlay AnalysisSave Result Property Field. The default value is "All", that is, all Property Fields and Object IDs are saved.
- All: save all Property Field and Object IDs;
- Object ID: only object ID is saved;
- Non-system Field: Non-system Field of Save Geometry only: (SmUserID Field is not saved).
- Datasource : Select the Datasource where the Result Dataset is stored.
- Dataset: Specifies the name of the Result Dataset.
- Tolerance : The default tolerance value is automatically given based on the Dataset participating in the analysis.
After the superposition operation, if the distance between the two nodes is less than this value, the two nodes are merged, and the default value of this value is the Fuzzy default value of the Clip Dataset. This value can be set in Fuzzy under Tolerances in the Vector Dataset tab of the Dataset Properties dialog box.
If Fuzzy is not set in the Dataset Properties, the tolerance defaults here are relative to the Dataset's coordinate system, as described in the Tolerance description .
- Compare Results : Check this box to automatically generate a comparison chart of Result Data and source data and display it in Map.
Caution: performing Overlay Analysis, please ensure that the data Projection of the operation is consistent, otherwise it may lead to superimposed Analysis failed.
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