Accuracy in Forest Covered Areas
To achieve 20cm survey accuracy, PhotoSat needs approximately 10 ground survey control points per 100km² of survey area.
PhotoSat routinely produces survey data accurate to 20cm in elevation on mine sites and oil and gas projects.
PhotoSat surveying using no ground survey points produces 20 cm relative and 3m global survey accuracy
PhotoSat applies a number of corrections to the stereo satellite photos prior to applying the ground survey data. These preliminary corrections usually bring the relative PhotoSat survey accuracy to 20cm in elevation over horizontal distances of 10km. The global accuracy prior to applying ground survey data is usually better than 3m in x, y and z.
PhotoSat processing using ten ground survey points per 100km2 produce better than 20cm survey accuracy
PhotoSat routinely achieves better then 20cm absolute survey accuracy using stereo WorldView-1, 2 or 3 satellite photos and Pleiades 1A and 1B Satellite photos when using ten ground survey points per 100 km2. Two examples are shown below.