Hello, I'm using flaash tool for my hyperspectral data (CASI image with 48 bands, spectral range from 380-1050 nm). I setted up all according to manual. Overall result is ok, only all watter bodies and some shadow places have 0 reflectance in whole spectral range. I expect such result in infrared region but not in the visible portion. Should it be like this or i missed some setting or doing something wrong? I went through setting steps several times. Try to change atmosphere models (for my data they are MLS or SAS). I'm using water retrieval option, water absorption feature 940 nm. Aerosol model - Rural (forest and urban area). Aerosol retrieval - None. Initial visibility 40 km. Spectral polishing - No and Wavelength recalibration - No. For Advanced Settings i'm using default settings, only azimuth angle i always set opposed to aircraft heading ( azimuth angle 160º if aircraft heading was 340º). Output reflectance scale factor 10000. Cheers, Jevgenijs