Radiometric calibration panel in the Netherlands

Agriculture
1

Hello,

I have a DJI Mavic 3M, and will be mapping tulips and peonys. For accurate results I want to calibrate the radiometric reflectance, but it is hard to find a good reflectance panel. The Micasense and Sentera are compatible with the drone, but the Sentera isn’t found in my country, and the Micasense is expensive.

Is it needed to calibrate for accurate data and comparison between flights?

Greetings,

Mees

2

Hi,

You can find more info here: Radiometric correction - PIX4Dfields

When comparing overtime, it would be interesting to use a reflectance panel.

DJI Mavic 3M:

  • These cameras are not fully radiometrically calibrated, only a relative calibration is done by the manufacturer: All bands are calibrated against the standard NIR band. Therefore, the cameras will not provide reflectance factors, but only relative values proportional to reflectance.

  • A reflectance target is required to obtain reflectance factors. Only Micasense and Sentera targets are compatible with the DJI P4 multispectral and Mavic 3 multispectral.

  • Without such a target, only self-normalizing indices produce meaningful results, i.e. indices that don’t depend on the absolute value. Examples of such indices are NDVI, NDRE, VARI, SIPI2, LCI, BNDVI, and GNDVI. Not self-normalizing are TGI and MCARI.