Using GCPs - PIX4Dmapper

A Ground Control Point (GCP) is a characteristic point whose coordinates are known. Their coordinates have been measured with traditional surveying methods or have been obtained by other sources (LiDAR, older maps of the area, Web Map Service). GCPs are used to georeference a project and reduce the noise.

More information:

• Instructional Video: Georeferencing: Pix4Dmapper video tutorials.

Articles about how to use GCPs:

• How to include GCPs in the project: How to include GCPs in the project.
  
• How to get GCPs on the field or through other sources: Step 1. Before Starting a Project > 4. Getting GCPs on the field or through other sources (optional but recommended).
• How to obtain the georeference using 2D or 3D GCPs taken from a Web Map Service: How to obtain the georeference using 2D or 3D GCPs taken from a Web Map Service .
  
• How to select the GCP coordinate system: How to select / change the Image / GCP / Output Coordinate System.
  
• How to add / import GCPs in the GCP/MTP Manager: How to import and mark ground control points (GCPs).
• How to add / import and mark GCPs with the rayCloud: How to import and mark ground control points (GCPs).
  
• How to mark GCPs with the Basic GCP/MTP Editor: How to import and mark ground control points (GCPs).
• How to mark GCPs with the rayCloud: How to import and mark ground control points (GCPs).
• How to import the Marks of GCPs/MTPs with the GCP/MTP Manager: How to import the Marks of GCPs/MTPs with the GCP/MTP Manager.
  
• How to export Manual Tie Points and/or GCPs with the rayCloud: How to export Manual Tie Points and/or GCPs in the rayCloud .
• How to export the marks of GCPs/Manual Tie Points with the GCP/MTP Manager: How to export the marks of GCPs/Manual Tie Points in the GCP/MTP Manager.