Standard Ground Sampling Distance (GSD) when using Skycatch flight app:
|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.