Pixel Value Mm2 ((new))

Multispectral drones (e.g., using NDVI for crop health) fly at fixed altitudes. A drone at 50 m height might achieve a ground sampling distance (GSD) of 2 cm/px. The would be (20 mm)² = 400 mm² per pixel. When a farmer detects a weed patch covering 10,000 pixels, the actual infestation area is 4,000,000 mm² (or 4 m²). This allows precise spot spraying, saving chemicals.

If you are developing software for image analysis, you can automate this conversion using Python and libraries like OpenCV or NumPy. Below is a programmatic look at how this calculation runs: pixel value mm2