GCP FORMAT

nikolaospaschalis · April 10, 2022, 1:24pm

Hello

I extracted a GCP file from my EMLID RS2 and it is in the following format (attached)
Project 2main.zip (774 Bytes)

Pix4d doesn’t accept it like this. Do I need to transform it?

My coordinates have to be like this (???)

4d 452911,285 4332254,121 22,660

Daniele_Lecci · April 11, 2022, 1:12pm

Hi @nikolaospaschalis,

Thank you for your message.

Here you can find additional information about the format of the Ground Control Points file:

It should contain four or six columns per line for 3D GCPs and 3 or 5 columns per line for 2D GCPs, and use a comma to separate the columns.

nikolaospaschalis · April 11, 2022, 3:25pm

thanks !!!

nikolaospaschalis · April 11, 2022, 8:37pm

One more question, please …
After generating a Quality report I get a yellow mark at the quality check and Georeferencing, why is that?

Daniele_Lecci · April 12, 2022, 9:40am

Hi @nikolaospaschalis

The yellow warning is shown in the Quality Report when

GCPs are used and the GCP error is more than 2 times the average GSD.

or

when no GCPs are used

You can find more information here:

In your case, it seems that the GCP error is between 2 and 4 times the average Ground Sampling Distance (GSD).

To resolve the problem, please read these possible causes with suggested solutions:

Not enough GCPs were used given the size of the project.
- Add additional GCPs. A minimum number of 3 GCPs is required but we recommend including at least 5 to 10 GCPs. When the topography of the area is complex adding more GCPs could lead to a more accurate reconstruction.
Accuracy values for GCPs are not properly set .
- If the accuracy of the GCPs is known then it should be entered instead of the default values in the GCP/MTP Manager.
- When using the default accuracy values in projects that are set to imperial (ft) then the GCP accuracy should be adjusted to 0.066.
Poor GCP marking: The quality of GCP marks can be estimated by reviewing the projection error for each GCP shown in the quality report. All projection error values should be less than 1 pixel.
- If the values reported are greater than 1 pixel then carefully remark the images.
GCPs are not marked on enough images.
- Add additional GCP mark on the project images. Each GCP should be marked in at least 2 images but we recommend marking the GCPs on more project images.

josh.abbott · October 31, 2023, 4:56am

Hello, further to the above.
When I try and import the below 3D GCPs, the Z value does not appear in the GCP manager on Pix4D mapper.
Have I got something wrong in the CSV?

Thank you.

1A_Final,288004.689666667,7600638.97933333,-11.0633333333333
1B_Final,288042.403333333,7600580.91166667,-8.44633333333333
1C_Final,288324.356333333,7600868.60433333,-11.5813333333333
1D_Final,288360.499,7600836.32166667,-9.18466666666667
1E_Final,288824.695666667,7601238.161,-10.9736666666667
1F_Final,289521.600333333,7601734.593,-10.521
1G_Final,289479.596666667,7601788.311,-10.4186666666667
2A_Final,289703.787,7601941.73833333,-10.5156666666667
2B_Final,289857.055666667,7602050.984,-10.5766666666667
2C_Final,290581.254,7601884.82633333,-10.2823333333333
2E_Final,291360.700333333,7601796.48333333,-10.9276666666667
2F_Final,291365.688666667,7601774.107,-9.772
2G_Final,291182.145,7601683.468,-10.3486666666667
2H_Final,290323.662,7601923.03966667,-10.112
3A_Final,292026.331666667,7601597.73733333,-10.9306666666667
3B_Final,292896.946666667,7601173.982,-10.228
3C_Final,292780.550333333,7600857.05733333,-3.74533333333333
3D_Final,291370.452333333,7601715.52033333,-10.1536666666667
3E_Final,291379.419333333,7601801.379,-11.162
3F_Final,292324.502,7601436.164,-9.89266666666667
4A_Final,293580.890333333,7600938.303,-9.64666666666667
4B_Final,293767.514333333,7600827.097,-9.768
4C_Final,294183.523333333,7600757.277,-9.75266666666666
4D_Final,294744.497666667,7600731.61166667,-10.0986666666667
4E_Final,293598.156333333,7601038.65366667,-11.341
5A_Final,295380.429666667,7600596.54966667,-9.738
5B_Final,295332.399666667,7600506.55266667,-9.995
5C_Final,296113.934666667,7600775.527,-9.62133333333333
5D_Final,296183.35,7600782.13266667,-9.04766666666667
6A_Final,296754.193666667,7601046.45433333,-10.8743333333333
6B_Final,296790.594,7600967.16733333,-9.76866666666667
6C_Final,297389.103,7601185.49333333,-9.421
6D_Final,297396.085,7600977.456,-7.95733333333333
7A_Final,298149.894,7601294.21633333,-9.828
7B_Final,298623.022,7601492.29866667,-9.11066666666667
7C_Final,298772.511,7601410.27933333,-9.90233333333333
7D_Final,299106.515,7601833.38766667,-8.90333333333333
7G_Final,298605.337666667,7601443.73633333,-10.5836666666667
Deck Corner_Final,298806.389,7601275.95433333,-9.151

Daniele_Lecci · October 31, 2023, 8:46am

Hi @josh.abbott,

Can you please provide a screenshot of your GCP manager window? Which Coordinate Reference System did you select?