Bidirectional reflectance measurements from space with the eos multi-angle imaging spectroradiometer (MISR)

摘要

The first spacecraft in the NASA Earth Observing System (EOS) series, EOS-AM1, is scheduled for launch in June 1998. The Multi-angle Imaging SpectroRadiometer (MISR) instrument is currently under development for flight on this platform. The instrument will obtain global multiangle imagery at nine seprate view angles roiented fore-aft along the spacecraft ground track, and will use a separate charge-coupled-device pushbroom camera at each angle. MISR measurements will be used to retrieve the optical properites of tropospheric aerosols over land and ocean, to study the bidirectional reflectance properties of the Earth's surface and clouds, and to measure terrain topography and cloud heights. Images will be acquired at 443, 555, 670, and 865 nm with spatial sampling, selectable in-flight, ranging from 275 m to 1.1 km. This paper describes the rationale behind the instrument design and in-flight calibration approach, and discusses the application of MISR to the acquisition of global bidirectional reflectance measurements of the Earth.