What is a good GSD?
Lower is better for detail. 1-3 cm/px is high resolution, 5-10 cm/px is medium. It depends on your project requirements.
Calculator
Enter your values
Analysis
Interpretation of the current calculator output
Enter values to see detailed analysis and insights.
How to Use
Step-by-step instructions
- 1Enter the sensor width (mm).
- 2Enter the focal length (mm).
- 3Enter the flight altitude (meters).
- 4Enter the image width (pixels).
- 5The calculator will show the GSD in cm/pixel.
Ground Sample Distance
Calculates the real-world size of one pixel in the image.
GSD = (Sw × H × 100) / (F × Iw)Variables:
SwSensor Width (mm)HFlight Altitude (m)FFocal Length (mm)IwImage Width (pixels)Example
Drone Mapping
Inputs:
Sensor:13.2 mm
Focal:8.8 mm
Alt:100 m
Width:4000 px
Steps:
- 1.GSD = (13.2 * 100 * 100) / (8.8 * 4000)
- 2.GSD = 132000 / 35200 = 3.75 cm/px
Result:
3.75 cm/px