Mathematics – Logic
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufm.p23a1088m&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #P23A-1088
Mathematics
Logic
5405 Atmospheres (0343, 1060), 5464 Remote Sensing, 5494 Instruments And Techniques
Scientific paper
The CRISM hyperspectral imaging spectrometer has been acquiring data from its platform on MRO since September 2006. The data consists of both: (i) hyperspectral targeted observations with high spatial resolution (~18 m/pixel) and 544 spectral channels, and (ii) multispectral (MSP) mapping strips with lower spatial resolution (~200 m/pixel) and 72 spectral channels. The spectral coverage for both modes of observation is 0.362-3.920 μm. Herein, we discuss the DISORT-based radiative transfer system ('CRISM_LambertAlb') for atmospheric and thermal correction of the MSP mapping-mode data, which is being processed in a pipeline fashion. Currently, in this phase-one version of the system, we use aerosol optical depths, surface temperatures, and lower-atmospheric temperatures, all from climatology based upon data from MGS/TES, and surface altimetry from MGS/MOLA. The DISORT-based model takes as input the dust and ice aerosol optical depths (scaled to the CRISM wavelength range), the surface pressures (computed from MOLA altimetry, TES lower-atmospheric thermometry, and Viking-based pressure climatology), the surface temperatures, the reconstructed instrumental photometric angles, and the measured I/F spectrum, and then it outputs a Lambertian albedo spectrum. After discussing the capabilities and limitations of the pipeline software system CRISM_LambertAlb, we then demonstrate its application on several multispectral data cubes -- particularly, the outer reaches of the northern ice cap, the interior layered deposits in Juventae Chasma, the Tyrrhena Terra area northeast of the Hellas basin, and the Phoenix landing site area in the northern plains. For the icy spectra near the northern ice cap, aerosols need to be included in order to properly correct for the CO2 absorption in the H2O ice bands at wavelengths near 2.0 microns. For the ILDs in Juventae Chasma, the correction of the photometric angles for slopes is necessary in order to more robustly locate hydrated sulfates with the spectral summary parameters. In future phases of software development, we intend to use CRISM data directly in order to retrieve the climatological spatiotemporal maps of aerosol optical depths, surface pressure and surface temperature. This will allow a second level of refinement in the atmospheric and thermal correction of CRISM multispectral data.
Arvidson Ray E.
Cavender Peter J.
Clancy Todd R.
CRISM Team
Cull Selby C.
No associations
LandOfFree
CRISM Retrieval of Surface Lambert Albedos for Multispectral Mapping of Mars with DISORT- based Radiative Transfer Modeling: Phase 1 -- Using Historical Climatology for Temperatures, Aerosol Optical Depths, and Atmospheric Pressures does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with CRISM Retrieval of Surface Lambert Albedos for Multispectral Mapping of Mars with DISORT- based Radiative Transfer Modeling: Phase 1 -- Using Historical Climatology for Temperatures, Aerosol Optical Depths, and Atmospheric Pressures, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and CRISM Retrieval of Surface Lambert Albedos for Multispectral Mapping of Mars with DISORT- based Radiative Transfer Modeling: Phase 1 -- Using Historical Climatology for Temperatures, Aerosol Optical Depths, and Atmospheric Pressures will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1405647