Misalignment between images and GCPs in PIX4Dcloud dataset creation wizard

This article explains the possible reasons why GCPs and images are not aligned in step 5. GCPs automation of the PIX4Dcloud dataset wizard.

This article explains the possible reasons why GCPs and dataset are not aligned in step 5. GCPs automation of the PIX4Dcloud dataset wizard.

Expected visualization.

Misaligment between dataset and GCPs.

• Check if in step 3. Coordinate reference system the coordinate system in which the GCPs were captured has been set.
  
  Issue description:  In step 3 of the project wizard the user can manually define the output reference coordinate system, or can decide to use the default coordinate system detected from the images geotags.
  
  When using GCPs, the output coordinate system defined in the step 3. of the project wizard must refer to the coordinate system in which the GCPs were captured. If this is not the case, the coordinates have to be converted.
  
  Solution: Make sure that the output coordinate system defined in step 3 of the project wizard is the desired coordinate system for the outputs to be generated but is also the coordinate system of the GCPs. 
  
  
• Check the order of Easting / Northing coordinates of the GCPs.
  
  Issue description: If the output reference coordinate system has been well defined, then it is possible that the order of the x and y coordinates of the GCPs has been reversed. This can be verified by clicking on Table.
  
  
  
  Solution: If the coordinates are inverted then this can be fixed by clicking on Easting or Northing to correct it.
• Check if the GCPs coordinates are correct.
  
  Issue description: It is possible that GCP coordinates have been manually entered incorrectly into csv or have been measured incorrectly.
  
  Solution: In these cases we recommend checking with the surveyor who performed the measurements if the information in the CSV is correct.