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[Pix4Dmapper 4.4] Micasense altum giving negative NDVI values when processed

In version 4.4.12 and the previous versions, Pix4Dmapper was rejecting negative K2 values from Micasense altum (radiometric calibration coefficients, you can read more here: https://support.micasense.com due to which the reflectance values were not being calculated correctly and the NDVI map had negative values. The bug has been fixed in version 4.5 (it is a preview version). You can download it from here.