Overlay Event Table
Instructions for use
Overlap Event Table can help users to get more information from the existing event table to solve practical problems. Overlap Event Table can be divided into intersection superposition and union superposition according to the different ways of superposition, and can be divided into line-line superposition, line-point superposition and point-point superposition according to the type of superposition event table. For more information on the event table, see the Overlap Event Table .
Function entrance
- In the Traffic Analysis tab-> Dynamic Segmentation group, click the Dynamic Segmentation button and click the Overlay Event Table button in the drop-down menu.
- Toolbox-> Traffic Analysis-> Dynamic Segmentation tool: Overlay Event Table; or drag the tool to the Model Builder Window and double-click the function graph.
Parameter Description
During Overlap Event Table, you need to specify Input Event, Overlay Event, and overlay parameters respectively.
- Input Event: Set parameters related to Input Event. Set the Datasource where the Input Event table is located, the event table, the event type, the routing identifier field, and the scale field. When the event table type is a line event, both the start scale field and the end scale field need to be set.
- Overlay Event: Set parameters related to Overlay Event. Set the Datasource where the Overlay Event is located, the event table used, the event type, the routing identifier field, and the scale field. If the event table type is a line event, you need to set both the scale field and the end scale field.
- Overlay Settings: Set overlay parameters. Set overlay type, event tolerance, and so on.
- Overlay Type: Set the overlay type, union, or intersection. For a description of overlay types, see Overlap Event Table .
- Event Tolerance: It is used to set the specified tolerance size, which is used to determine whether the generated line event is a zero-length event. If the tolerance is 1, it means that the length of the generated line event is less than or equal to 1, and it is regarded as a zero-length event. Tolerance defaults are related to the Dataset's coordinate system and are described in the tolerance description .
- Remove zero-length event: It is used to set whether to remove zero-length event. This can be set when both the Input Event and Overlay Event are line events and are intersected, or when one of the Input Event and Overlay Event is a line event and is combined. Zero-length events are selected based on the size of the event tolerance. Check to remove zero-length events, otherwise they remain in the Result Event table.
- Reserve the attribute fields of the event table: Set whether to reserve the Overlay Event TableProperty Field. In the new event table generated, other Property Fields except System Field: in the Overlay Event Table are reserved by default.
- Result Data: Set the Result Data, including the routing identifier field, scale field, and the Datasource and Resulting dataset name to be saved in the Result Data. If a dot is to be superimposed, only one scale field needs to be specified; the start scale field and the end scale field need to be specified respectively for dot-line and line-line event superimposition.
- When you are ready, click the Execute button to perform this step.
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