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Ground Control Points

In order to ensure the highest accuracy processing possible, even in RTK/PPK situations, one or more GCPs is recommended as it can greatly increase accuracy

For this reason, during Standard Processing, the system will expect a GCP file even in RTK/PPK situations.

While we recommend that this protocol be followed, if no GCPs are available, you may upload our GCP template file.

Select both the “Advanced photogrammetry”&“Add ground control points” if the user does not wish to click their own GCPs and wants Delair to ensure it.

Add the GCP file dragging and dropping the file in the upload area, or press browse in order to select the file via the browser.

The file should be in .CSV or .TXT format, no header row and only delimited with a comma. The file must be in the following format:

name/reference of the GCP

  1. X coordinate
  2. Y coordinate
  3. Z value
  4. X accuracy (optional)

Once the GCP file has been uploaded, verify 

that the x/y/z columns appear in the correct order.

Press on Edit CRS to select the projection of the GCPs.

*The GCP CRS will take into consideration the CRS selected at the project creation. It must be selected. If it is not the same, reconvert the GCP file to the same Project CRS and then follow step 

If the selected CRS and the GCP file coordinate system match, the GCPs should appear on the map as orange dots within the survey boundary.

If nothing appears, then it may be possible that the CRS is incorrect or the X and Y coordinates are reversed. 

To retry, deselect Add ground control points (GCP), fix the file, and then select Add ground control points (GCP) and try again.

  • Eastings would be X
  • Northings would be Y
  • X field would be Longitude
  • Y field would be Latitude
  • Longitude is W or E
  • Latitude is N or S

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