Surface retrievals from Hyperion EO1 using a new, fast, 1D-Var based retrieval code

Abstract

We have developed a new algorithm for the simultaneous retrieval of the atmospheric profiles (temperature, humidity, ozone and aerosol) and the surface reflectance from hyperspectral radiance measurements obtained from air/space-borne, hyperspectral imagers such as Hyperion EO-1. The new scheme, proposed here, consists of a fast radiative transfer code, based on empirical orthogonal functions (EOFs), in conjunction with a 1D-Var retrieval scheme. The inclusion of an 'exact' scattering code based on spherical harmonics, allows for an accurate treatment of Rayleigh scattering and scattering by aerosols, water droplets and ice-crystals, thus making it possible to also retrieve cloud and aerosol optical properties, although here we will concentrate on non-cloudy scenes. We successfully tested this new approach using hyperspectral images taken by Hyperion EO-1, an experimental pushbroom imaging spectrometer operated by NASA

Monitoring Orbital Precession of EO-1 Hyperion With Three Atmospheric Correction Models in the Libya-4 PICS

“…End of mission is projected for late 2016 due to a local equatorial overpass time earlier than 8 AM. Hyperion has been used widely for a number of different studies [5] with recent examples including the mapping of land-cover land-use change [6][7][8] and disturbances [9]; volcanoes and geology [10,11]; water resources [12]; evaluating seasonal dynamics at pseudo invariant calibration sites (PICS) and vegetated eddy covariance sites [13]; as well as algorithm evaluations [14][15][16][17] with many more uses not mentioned here. The utility of Hyperion for crosscalibration has gained interest in recent mission years [18,19] and archived data could be useful for many years to come.…”