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THE FEUTEX TOOLKIT

Nadir Camera Ground Footprint

Estimate a flat-ground imaging footprint and ground sample distance from camera geometry.

Geospatial workspace● Runs in your browser
01 Your input
02 Your result
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FormulaGround swath width = height*sensor/focal; Ground sample distance = height*sensor/(focal*pixels)
Sources and model references

Worked example

Inputs

Height above ground
1000 m
Sensor width
36 mm
Focal length
50 mm
Image width
6000 pixels

Expected results

Ground swath width
720 m
Ground sample distance
0.12 m/pixel

Load the example in the workspace to reproduce these results. Display rounding does not change the underlying calculation.

How to use this tool

  1. Estimate a flat-ground imaging footprint and ground sample distance from camera geometry.
  2. Set height above ground, sensor width, focal length, image width in the indicated units.
  3. Calculate and compare ground swath width, ground sample distance.

Try this example

{
  "height": 1000,
  "sensor": 36,
  "focal": 50,
  "pixels": 6000
}

Accuracy and scope

Nadir pinhole geometry over locally flat terrain. At orbital altitude use a curved-Earth model; not a flight planning approval.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.