Other
Scientific paper
Jun 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.474e..13s&link_type=abstract
Proceedings of the SPECTRA Workshop - The concept of a space-borne Earth Observation Mission addressing the terrestrial componen
Other
Scientific paper
The Compact High Resolution Imaging Spectrometer (CHRIS) is scheduled to be launched in the third quarter of 2001 on an experimental platform funded by ESA under the PRoject for On-Board Autonomy (PROBA). The agility of the platform allows the instrument to capture up to 5 images along track, to give multi-view angle (MVA) capability. The spectral range of the instrument is 400-1050nm, and the spatial resolution can be as fine as 18 metres. The number of bands acquired depends on whether a full swath (ca. 15km) or half swath is captured, and whether the image is taken at full spatial resolution, or, by on-board averaging of signals and adopting longer integration times, at half resolution (i.e. about 35-40m). At full resolution, full swath 18 bands may be selected, while more are available under the other options. The instrument is built with prisms rather than gratings and so the spectral resolution varies with wavelength, the spectral sampling interval being about 11nm at 1 micron and 2-3nm at 400nm. The mission has a funded post-launch lifetime of one year, and the spacecraft system is capable of acquiring and downloading no more than 1 images set (i.e. 5views of a single target) per day. The prime scientific mission for the instrument consists of four parts. First, there is a campaign to retrieve geophysical variables by inversion of BRDF models, at a small number of sites, all of which are already sites of intensive study for other missions. Second, there is an aerosol mission, whose aim is to retrieve aerosol optical thickness and other parameters at a variety of well-instrumented sites. There is a submission to retrieve constituents (suspended sediments, chlorophyll) from coastal waters, based on regular acquisitions at one site, and a further ocean experiment supported by a boat campaign. Finally, there is a varied collection of experiments, many of them agricultural, from a world-wide set of investigators in response to an ESA Announcement of Opportunity for the use of CHRIS data. The mission shares with SPECTRA the key feature of collecting MVA data in large number of bands, and of retrieving geophysical parameters from inversion of physically based radiation models. The spectral range is, however, much more limited than that of SPECTRA, and over the lifetime of the mission we can hope to attain just a couple of hundred images sets, compared with 20-25,000 for SPECTRA (fifteen a day for five years). It is hoped that the community can use CHRIS-PROBA data to gain familiarity with such problems of MVA data as atmospheric correction and geometric registration, in readiness for the SPECTRA mission.
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