How we can define Ground Control Point (GCP) A Ground Control Point (GCP) is a known point on the Earth's surface with accurately surveyed geographic coordinates. GCPs are used in various fields such as surveying, cartography, photogrammetry, and remote sensing to georeferenced and enhance the accuracy of spatial data, particularly in the process of mapping or creating geospatial products.
In the context of remote sensing and photogrammetry, GCPs serve as reference points that tie imagery or aerial photographs to specific locations on the Earth's surface. By accurately determining the coordinates of these points, one can correct distortions, scale, and orientation in images, ensuring that the resulting geospatial products are aligned with real-world coordinates.