Atmospheric Correction of ENMAP Data Over Land and Water
نویسندگان
چکیده
EnMAP is a hyperspectral imager covering the 400 – 2450 nm region with about 200 spectral channels. The spatial resolution is 30 m and the nadir swath width is 30 km with an off-nadir across-track tilt capability of 30°. The instrument consists of two spectrometer units (VNIR and SWIR). Due to the prism design the channel sampling distance varies from about 5 nm (blue region) to 12 nm (SWIR). EnMAP data will be acquired over land and coastal regions. Different approaches to atmospheric correction will be used. For land scenes the ATCOR model is taken which is based on look-up tables of radiative transfer calculations with the MODTRAN code. For water scenes the MIP (Modular Inversion Program) code is taken. Both codes will account for cirrus detection and correction, and will calculate a map of the cirrus optical thickness. Selected examples on the retrieval of simulated EnMAP top-of-atmosphere (TOA) radiance scenes will be presented.
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