Water and Bottom Properties of a Coastal Environment Derived from Hyperion Data Measured from the EO-1 Spacecraft Platform

Hyperion is a hyperspectral sensor on board NASAs EO-1 satellite with a spatial resolution of approximately 30 m and a swath width of about 7km. It was originally designed for land applications, but its unique spectral configuration and high spatial resolution make it attractive for studying complex coastal ecosystems, which require such a sensor for accurate retrieval of environmental properties. In this paper, Hyperion data over an area of the Florida Keys is used to develop and test algorithms for atmospheric correction and for retrieval of subsurface properties. Remote-sensing reflectance derived from Hyperion data is compared with those from in situ measurements. Furthermore, waters absorption coefficients and bathymetry derived from Hyperion imagery are compared with sample measurements and LIDAR survey, respectively. For a depth range of approx. 1-25 m, the Hyperion bathymetry match LIDAR data very well while the absorption coefficients differ by approx. 16.5 on average. More importantly, in this top-to-bottom processing of Hyperion imagery, there is no use of any a priori or ground truth information. The results demonstrate the usefulness of such spaceborne hyperspectral data and the techniques developed for effective and repetitive observation of complex coastal regions.