EO-1 Hyperion hyperspectral aggregation and comparison with EO-1 Advanced Land Imager and Landsat 7 ETM+

The EO-1 spacecraft, launched November 21, 2000 into a Sun-synchronous orbit behind Landsat 7, hosts advanced technology demonstration instruments, whose capabilities are currently being assessed by the user community for future missions. A significant part of the program is to perform data comparisons between the Hyperion Imaging Spectrometer and Advanced Land Imager (ALI) payloads on the EO-1 spacecraft with the Landsat 7 ETM+ sensor. To perform the absolute radiometric comparison, an aggregation method was developed and used to combine the proper portions of the Hyperion 10 nm bands to emulate the broader multispectral response of the ALI and ETM+. The aggregation capability allows radiometric comparisons between different instruments with different spectral response functions. This paper reviews the aggregation methodology, and presents absolute comparison results. A demonstration of the replication of portions of ALI and ETM+ scenes through a synthesis of Hyperion hyperspectral data is also provided. The capability of synthesizing broad band data from a hyperspectral sensor will enable users to test the selection of broad bands for future missions by using various combinations of Hyperion bands.