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Translations using 1 GCP


I have a P4RTK that I am using to capture survey data and process in Pix4D. The base station is positioned using a “here” shot, meaning a horizontal and vertical translation is required to bring the work into terms of the local coordinate system. I know what the translation parameters will be, and they are in the order of 1.3m horizontally and around 30m vertically.

It is written above that horizontal grid corrections are not currently supported. What are the implications of using the RTK accurate EXIF position data from the photos to get the model to process, then use just one GCP to translate the data horizontally and vertically?
Is this the best way to handle the translation issue?



Hi @rhys,

In general, we recommend a minimum of 3 GCPs to georeference the project. However, I understand that you are using a DJI Phantom 4 RTK that has precise image geolocation, and you would just like to shift the project to the correct location.

Theoretically, it should be possible to use only one GCP but I am not saying this is the recommended way to approach the situation.

The best would be if you place a mininum of 3 GCPs or that you do transform the image geolocation in the output coordinate system as mentioned here:

I hope this helps,