Drone Mapping Accuracy Calculator

Calculate GSD, survey accuracy, photo count, and flight parameters from camera specs and flight altitude for photogrammetric mapping missions.

Inputs

Sensor width (mm)

Focal length (mm)

Image width (px)

Image height (px)

Flight altitude (m AGL)

Front overlap (%)

Side overlap (%)

Survey area (hectares)

Flight speed (m/s)

Ground control points

Tab to move between fields

Results

Ground sample distance (cm/px)

0.6

Horizontal accuracy (cm)

0.9

Vertical accuracy (cm)1.51

Total photos1,624

Flight lines28

Trigger interval (sec)0.7

Photo footprint width (m)33

Photo footprint height (m)22

Flight distance (km)9.17

Flight time (min)19.1

Recommended GCPs7

Data size (GB)12.66

Footprint Area (m²)726

How to Use This Calculator

Enter sensor width (mm), focal length (mm), image width (px), and image height (px) for your camera.
Set flight altitude (m AGL) and desired front and side overlap percentages.
Review GSD (cm/px), expected horizontal accuracy (cm), and vertical accuracy (cm).
Compare accuracy estimates to your project's mapping specification to confirm the sensor-altitude combination is sufficient.
Add ground control points (GCPs) to improve vertical accuracy beyond the RTK-only estimate.

How the result changes with Sensor width (mm)

Sensor width (mm)	Ground sample distance (cm/px)	Horizontal accuracy (cm)
5.9	0.27	0.4
18	0.82	1.23
33	1.51	2.26
45	2.06	3.08

What each input means

Sensor width (mm): Camera sensor physical width. DJI Mavic 3E = 17.3 mm, Phantom 4 RTK = 13.2 mm.
Focal length (mm): Lens focal length (35mm equivalent). Check camera specs for actual value.
Image width (px): Image resolution width in pixels.
Image height (px): Image resolution height in pixels.
Flight altitude (m AGL): Altitude above ground level. Lower = better GSD but more photos.
Front overlap (%): Overlap between consecutive photos along flight path. 75-80% for mapping.
Side overlap (%): Overlap between adjacent flight lines. 60-70% typical.
Survey area (hectares): Total area to survey (1 ha = 2.47 acres).
Flight speed (m/s): Ground speed during mapping flight.
Ground control points: Number of surveyed GCPs. 4+ significantly improves accuracy.

What each result means

Ground sample distance (cm/px): Size of one pixel on the ground. The fundamental measure of mapping resolution.
Horizontal accuracy (cm): Expected horizontal positional accuracy of the orthomosaic.
Vertical accuracy (cm): Expected elevation model accuracy.
Total photos: Number of images the mission will capture.
Flight lines: Number of parallel flight lines.
Trigger interval (sec): Time between consecutive photos. Ensure camera can keep up.
Photo footprint width (m): Ground width covered by each photo.
Photo footprint height (m): Ground height covered by each photo.
Flight distance (km): Total distance the drone will fly.
Flight time (min): Estimated flight duration (excludes takeoff/landing).
Recommended GCPs: Suggested number of ground control points for this area.
Data size (GB): Estimated storage for all captured images.

How this is calculated

Worked example, using the default values

Identify Input Parameters
4 parameters
Sensor width (mm) = 13.2, Focal length (mm) = 24, Image width (px) = 5472, Image height (px) = 3648 = 10 input(s) provided
Calculate Ground sample distance
Ground sample distance = gsdM * 100
0.6 = 0.6
Calculate Horizontal accuracy
0.9 = 0.9
Calculate Vertical accuracy
1.51 = 1.51
Calculate Total photos
Total photos
1624 = 1624

Engine last updated August 5, 2026.

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