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Warning message w0024

I am currently in the process of learning to use Pix4D and I am having issues with a sample project. (This one here) I have been following the instructions and inputting all the data it asks for. Yet, when I import the GCPs I get an warning message (Warning w0024) saying that one or more GCPs lie far outside the the area covered by the images.

I have checked and double checked the GCP Coordinate system and it is exactly what the sample directions say it should be.

I have run one other project a partner gave me and it worked fine (Apart from the initial GCP circles being 100m above the ground due to the drone elevation) so I have no idea why I am suddenly getting this warning message.

Dear Scott,

Could it be that the latitude and longitude (or X and Y) have been inverted? Are the coordinates you are entering in Latitude, Longitude or in the project coordinate system? The quarry is located here’19.2%22N+6%C2%B032’11.3%22E/@46.655334,6.5342863,876m/data=!3m2!1e3!4b1!4m5!3m4!1s0x0:0x0!8m2!3d46.655334!4d6.536475?hl=en

You can check that the coordinates you are entering do indeed lie here. 

Best regards,