I have stitched my Sequoia data with Pix4Dmapper. I am using the values in the generated Red and NIR orthomosaics tiff files to calculate NDVI values. However, when I compared the NDVI values which I get with that of the pixel in the same position of the exported NDVI geoTiff I do not get the same values.
NIR RED Calculated_NDVI Exported_NDVI
39528 11872 0.538054475 0.8469724
12475 9586 0.130955079 0.61869067
31652 30197 0.023525037 0.4404439
Can you please advise?