Layer intersection refers to the analysis function of intersection of two or more Datasets. For a detailed description of the intersection operator, please refer to the Overlay Analysis operator .
Instructions for use
- Source Dataset Type can be Point, Line, Region Dataset, Overlay Dataset Type can be Line Dataset, Region Dataset, and only when Source Dataset is Line, Line types are only supported on Overlay Dataset.
- The overlapping part of the original two Datasets is retained in the Result Dataset, and the Point Dataset can be obtained when the line is intersected. At this time, the output type of the result needs to be selected as Point.
Function entrance
- Spatial Analysis tab-> Vector Analysis-> Overlay Analysis-> Intersect.
- Toolbox-> Vector Analysis-> Overlay Analysis-> Intersect.
Parameter Description
- Source data: Select the Datasource of the Dataset to be intersected and the Dataset to be intersected. Support the input of multiple Datasets for intersection analysis.
- Overlay Data: Selects the Dataset to Intersect with the Source Dataset and its Datasource.
- Result Data: Select the Datasource where the Result Dataset is stored, and specify the name of the Result Dataset
- Field Settings: Select Field from Source Dataset and Overlay Dataset as Select Fields of Result Dataset.
- Tolerance: The default tolerance value is automatically given according to 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 .
- Keep All Source Data Fields: Select the check box to keep all source data fields. If the source data and the Overlay Data have the same name, the field name from the source data in the Result Dataset is "field name _ 1", and the field name from the Overlay Data is "field name _ 2".
- Keep All Overlay Data Fields: Select the check box to keep all Overlay Data fields. If the source data and the Overlay Data have the same name, the field name from the source data in the Result Dataset is "field name _ 1", and the field name from the Overlay Data is "field name _ 2".
- Output Result Type: The output Result Type of intersection analysis, which is consistent with the source Dataset Type by default. When the source data and Overlay Data are both lines, the Output Result should select the point type, otherwise it will The execution is failed. For example, if you want to get the intersection of road line and river line as the result bridge data, the Output Result Type needs to be set to point.
For example, as shown in Figure 1 below, the ridge is at the junction of two patches with the classification codes of 0321 and 0110. Now it is necessary to calculate the net area of the patch. First calculate the area of the patch, and then deduct the area of the linear ridge. The linear ridge is at the edge of the patch, and only half of the area of the linear ridge is deducted. If "Single object" is checked, the returned result is that the ridge belongs to only one of the patches, as shown in Figure 2. If it is not checked, the returned result is that the two line objects are retained at the same time, as shown in Figure 3. Then, by specifying the patch ID and deducting the Polyline area in the corresponding patch, the net area result can be obtained.
Precautions
Before performing Overlay Analysis, please ensure that the data Projection of the operation is consistent, otherwise it may result in overlay Analysis failed.
The 11.1 version of the intersection tool reconstructs the algorithm, and the performance is greatly improved compared with the previous version. The difference from the original algorithm is that when the objects in the Source Dataset have overlapping faces, the output Number of result objects is different (as shown in the following figure).
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