Phantom 4 Emlid RTK/PPK

Everything is coming together. We are starting to get consistently good results and have the workflow down. Just bought another M+ kit to put on the Yuneec H520!

Accuracy

Relative Accuracy

Measurements of distance, area and volume within the map should be accurate to within 1-3 times the ground sampling distance. Map measurements are typically within 1-3% of ground-based measurements.

Ground Sampling Distance (GSD) 0.74 in/pixel
Approx Horizontal Relative Accuracy Range 0.14 in
Approx Vertical Relative Accuracy Range 0.14 in
Optimized Camera Location Error X 0.04 in Y 0.14 in Z 0.14 in
Optimized Camera Location XYZ RMSE 0.2 cm/pixel

Ground Control Points

Global accuracy, when using ground control points (GCPs), is directly correlated to the accuracy of the positioning equipment used. When processing a map without checkpoints, the accuracy is inferred from residual error in the GCPs after calibration, which is only an approximation of accuracy. To verify the accuracy of your map, use checkpoints. ASPRS guidelines require use of checkpoints in order for a licensed surveyor to specify that a map is survey-grade.

Label X Error (Inches) Y Error (Inches) Z Error (Inches)
1 -0.0197 0.0118 -0.063
2 0.0157 0.0236 0.0945
3 0.0157 -0.2874 0.3268
4 -0.0276 0.185 -0.1024
5 0.0079 0.0079 0.0197
6 -0.0197 0.0118 0.0276
7 0.0866 -0.1299 -0.0787
Total (RMSE) 0.037 0.1387 0.1402