08-17-2017 04:44 AM
I'm still new to remote sensing and ERDAS. Im looking to carryout NDVI & change detection on 4-band RGBN digital aerial photographs. From what i've read, it converting DNs to reflectance is a recommeded pre-processing step as DNs are okay to use if examining one image, but not sufficient for comparison of one image date to another image date. I've seen the tool for Landsat 7 conversion, but how do I go about this for digital aerial photos?
Would this DN conversion be a necessary step to follow if trying out other change detection methods, such as Image differencing or PCA?