Ground Control
Ground control points (GCPs) can be either a TXT or CSV file. To load GCPs, use File->Open. SpatialExplorer will then ask you to assign fields (name, X, Y, Z, type) to the columns in the file. You also need to specify which row contains the first GCP in order to skip any header or metadata.
GCP Type
GCPs are assigned via their Type attribute as either Check, Control, or Unused points:
Check and Control points are generally collected at the same time, using the same methodology.
Control points are used for data adjustments, whereas Check points are used for accuracy reporting. Control points appear orange in the main view, while check points appear blue.
GCPs utilized for data adjustments should not be used to validate the accuracy of the data product.
Ensure the Coordinate Reference System (CRS) is properly configured to match the CRS that the GCPs reference. For configuring the CRS menu, refer to Coordinate Reference System window.
Visually verify the GCPs are properly georeferenced:
You can find more information on the principles of ground control usage and collection here:
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