Determining survey resolution (GSD) from altitude

Site Scan customers often need to deliver an orthomosaic of a specific quality. One of the largest drivers of output quality is the height at which the images are collected. Based on the geometry of the camera sensor and the lens used, the following table allows the calculation of the Ground Sampling Distance (GSD) of the raw imagery.



  • Site Scan Sony R10C 20mm
Altitude GSD
200 feet 1.2 cm/pixel
400 feet 2.4 cm/pixel


  • Site Scan GoPro
Altitude GSD
100 feet 1.6 cm/pixel
213 feet 3.4 cm/pixel
350 feet 5.5 cm/pixel


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