Instructions for use
Calibration is the process of adjusting a route measurement to a known reference point by reading the scale values stored in the attribute table of the Reference Point Dataset. For more information on Calibrate Route, refer to the Calibrate Route overview .
Function entrance
- In the Traffic Analysis tab-> Dynamic Segmentation group, click the Dynamic Segmentation button and click the Calibrate Route button in the drop-down menu.
- Toolbox-> Traffic Analysis-> Dynamic Segmentation tool: Calibrate Route; or drag the tool to the Model Builder Window and double-click the function graph.
Parameter Description
- Source data: Select the Datasource, Dataset, and Route ID fields where the line data for Generate Route data is located.
- Reference Point Dataset: Select the Datasource, Dataset, route identification field, and scale value field where the Point Dataset for Calibrate Route is located.
- Set Other Parameters:
- Calibration method: It is divided into Calibrate by Distance and Calibrate by Measure. For a description of the two calibration methods, refer to the description of the Calibrate Route overview .
- Errors field, Ignore Intervals Between Subobjects: same as the parameter description in Generate Route. See Generate Route for instructions.
- Tolerance Value: Sets the calibration tolerance and tolerance value units.
The Calibrate Route can be given a distance value called the calibration tolerance. When the shortest distance from a reference point to a route is less than a given calibration tolerance limit, we say that the reference point is within the calibration tolerance. If the shortest distance from the reference point to the route is greater than given calibration tolerance, the reference is considered not to be within the calibration tolerance.
Tolerance defaults are related to the Dataset's coordinate system and are described in the tolerance description .
- Reserve route objects not passed by reference points: Set whether to reserve route objects not passed in the result Route Dataset by reference points。
The following two scenarios are considered to be routes that do not have a reference point to pass through, resulting in LineM not being calibrated:
- If no reference point in the
- reference point data has the same route ID as the LineM, the LineM will not be calibrated. Only reference points that are the same
- as the LineM's route ID may be used to calibrate the route. If none of these reference points are within the calibration tolerance of the route, then the route will have no reference points passing through, meaning that the route has not been calibrated.
Users can decide whether to keep these routes that have not been calibrated according to the needs of the actual study.
- Result Data: To set the result after calibration, you need to set the Datasource saved by Route Data and the name of Route Dataset.
- When you are ready, click the Execute button to perform this step.
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