The Lake Frome field campaign in support of Hyperion instrument calibration and validation

Lake Frome, a dry salt lake in South Australia, was chosen as a calibration site for Hyperion primarily for its brightness, but also for its temporal invariance and spatial homogeneity. Surface spectral data were collected along a transect through the centre of the lake, during a four-day period prior to the Hyperion overpass. Meteorological data collected by a portable weather station and a multi-frequency shadow-band radiometer installed at the lake shore, along with data from a nearby radiosonde and CIMEL sun photometer sites were used to measure atmospheric conditions at the time of overpass. The spectra were processed to reduce noise and modeled to at-sensor radiance for the 242 Hyperion spectral bands. The Hyperion images were geo-located using distinct ground features. Spectra for the ground sites were compared with those taken in the field, overall the agreement was excellent. The combination of field and laboratory measurements have provided some hypotheses of the systematic and causal way the lake behaves and changes spectrally