This is for thesis work involving mapping of above-ground mangrove forest biomass using Landsat 7 ETM+ imagery.
I am assessing correlations between biomass with vegetative indices, e.g. NDVI, and then mapping biomass. I am using a 04/02/2013 Landsat 7 ETM+ image with Scan Line Corrector off, so I need to gap fill. I am using a 08/03/2013 image for gap fill.
Both images have been atmospherically calibrated before gap fill using DOS_improve. However, the reflectance of the two images still contrast to each other. I do not know why the reflectance is contrasting, or how to better match the reflectance of the 08/03/2013 image to the 04/02/2013 image.
Thank for your help!