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MISR Level 2 and Level 3 Aerosol Products

Aerosol retrievals are provided for each individual orbit over a 380-km wide swath (Level 2) and for globally gridded monthly and seasonal aggregates (Level 3). Global coverage is obtained about once per week. Uses multiangle/multispectral imaging capability of MISR (9 view angles, from nadir to 70º forward and aft in each of 446, 558, 672, 866 nm spectral bands). Unique strengths include accurate optical depth retrievals over bright desert source regions and distinction of particle sphericity.

Example result / latest result (if near-real time)


Satellite: Terra (NASA)
Instrument(s): Multi-angle Imaging SpectroRadiometer (MISR)
Instrument/algorithm PI: David J. Diner, Jet Propulsion Laboratory
Contact details: David.J.Diner[at], Ralph.Kahn[at]
Parameter(s): Aerosol optical depth, 3-to-5 size bins (small, medium, large), fraction AOD non-spherical, and a qualitative constraint on SSA (absorbing/non-absorbing)
Aerosol algorithm: Different for DarkWater and Heterogeneous Land Surfaces
Cloud screening: RCCM (radiometric)/SDCM (stereo)/ASCM (angular- spectral)/angular smoothness/angular correlation methods
Aerosol model: Bimodal and trimodal mixtures of spherical absorbing and non-absorbing particles, plus non-spherical dust models
Retrieval assumptions: Negligible ocean water-leaving radiance at 672, 866 nm; spectral invariance of land surface angular reflectance factor; limited selection of aerosol components and mixtures
Retrieval limitations: Not applicable over Case 2 waters, homogeneous snow/ice, cloud
Spatial, temporal coverage: ±80º latitude, dayside, late February 2000 to present
Spatial, temporal resolution: 17.6 km / 380 km / 16 day orbit repeat period; every 9 days at equator, 2 days near poles
Spatial, temporal resolution: OMI - 13x24 km² / 14-orbits per day / Daily Global Coverage
TOMS - 50x50 km2 / 14-orbits per day / Daily Global Coverage
Operations status: Operational / experimental
Validation status: Validated against ground-based and aircraft sunphotometers
Quality control: Goodness of fit thresholding
last algorithm version: Version 22 (12/2007)
last validation: 12/2007; ongoing