Standard Ground Sampling Distance (GSD) when using Skycatch flight app:
| Resolution (GSD) | Z-accuracy | Altitude |
| 2 | 3 - 6 cm | 40m |
| 3 | 4.5 - 9 cm | 60m |
| 4 | 6 - 12 cm | 80m |
| 5 | 7.5 - 15 cm | 100m |
| 6 | 9 - 18 cm | 120m |
The expected accuracy for the X & Y coordinates is 2x GSD horizontally.
The expected accuracy for the Z coordinate is 3x GSD vertically.
The rule of thumb for transferring from GSD to Z accuracy is multiplying the GSD value by 1.5 - 3.
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