Validation of DESIS Surface Reflectance Product with Measurements on Ground

Kurzfassung

The hyperspectral instrument "DLR Earth Sensing Imaging Spectrometer" (DESIS) was developed within a collaboration between the US company Teledyne Brown Engineering (TBE) and the German Aerospace Center (DLR). DESIS is operating onboard of the International Space Station (ISS) since August 2018 and is in operational phase since October 2019. The validation of the L2A products in remote sensing is performed by different approaches. One of them is the comparison of the ground surface reflectance as delivered by the L2A-remote sensing products with in-situ measurements. Those in-situ measurements are performed with spectroradiometers at the same wavelength of the remote sensor and at the time of a satellite overpass. The presentation provides recent validation results for the DESIS BOA reflectance product on basis of ground-based reference measurements. Accuracy represents the mean difference of BOA-reflectance retrieval to a reference value and uncertainty gives the rms around the reference. Accuracy and uncertainty of surface reflectance retrieval from DESIS data is benchmarked by comparison with surface reflectance retrieval from Sentinel-2 data.