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| Name | Caption |
|---|---|
| Input DEM Folder/File | Input folder or file containing DEM to adjust |
| Input 3-D GCP Source | Input file of 3-D GCP source data |
| 3-D GCP Source Extra Options | Additional options for the input 3-D source |
| Output Folder | Output folder |
| Overwrite Results | Overwrite existing results |
| Reference DEM Source | DEM to use as reference |
| Input DEM Channel | Channel of DEM in input file or files |
| Adjustment Method | Method of adjustment |
| Adjustment Method Option | Additional options for the adjustment method |
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Input DEM Folder/File
The path and name of the folder or file of a DEM to be adjusted. If a folder is specified, all files in the folder meeting the specified criteria will be processed. If necessary, you can use a wildcard, such as the asterisk (*).
This parameter is mandatory.
Input 3-D GCP Source
The source of the 3-D ground control points (GCPs) to be used as reference for adjustment, such as a vector file or an an OrthoEngine project file containing points.
3-D GCP Source Extra Options
Extra options for the Input 3D GCP Source parameter.
If the input 3-D GCP source is a vector file, the value of this parameter can be specified as segment numbers with a field name. For example, 1,2,3:Z or 1,3,4.
If the input 3-D GCP source is an OrthoEngine project file, the value of this parameter can be specified as GCP, TP, CP or ALL (default).
Output Folder
The path and name of the folder to which to write the output files.
Overwrite Results
Select this check box to overwrite the existing output files, if any exist. If this check box is left clear, and an output file exists in the relevant folder, the status of the job displays a message informing you of the existence and name of the output file. The message is also written to the event log of the job.
Reference DEM Source
The path and name of the folder containing the reference DEM files requiring adjustment.
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The channel of the DEM in the input files. If no value is specified for this parameter, the module uses the first channel by default.
Input DEM Channel
The channel of the DEM in the input file or files. If no value is specified for this parameter, the module uses the first channel by default.
Adjustment Method
Adjustment Method Option
Additional options for the value of the Adjustment Method parameter.
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Preprocessing requirements
Input control point must have valid elevation.
Module details
The DEM Adjust with 3-D GCPs/TPs module adjusts the digital elevation model (DEM) based on the known 3-D GCP elevation. The elevation of the GCPs must be accurate. If any of the points have an elevation error, it will affect the area surrounding the point and the output overall.
The points can come from a vector file or a CATALYST Professional OrthoEngine project file. While the input must be a single source (that is, a single file), it can be multiframe DEM files.
During processing, the module first extracts point information from the source and then adjusts the single-frame DEM. The control point can be a valid control point or an inspection point, or all control points and inspection points. There are several adjustment methods to allow the users for limited control use of selected points. For example, when all-point method is used, all selected points will be used. When lower than elevation point method is used, only the point within defined elevation error range can be used, thus avoiding the influence by unusual GCP point.
When elevation truncation all-point method is used, the elevation beyond elevation error range can be used only after the truncation value. Standard deviation interior point method selects the point within given standard deviation range, while standard deviation truncation all-point method selects all points. but if the point elevation exceeds the defined standard deviation, such elevation will be truncated.
The correction method is the forced fitting based on finite points, so it can not guarantee the accuracy of result.
Job results
The output result is the corrected DEM file, currently only supports PIX format.
If reference DEM is provided, when the input control point source is from OrthoEngine project file, all control points will be output as a vector file (PIX format), and the output point property not only includes horizontal residual, but also elevation residual.
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