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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) |
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| 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]jpl.nasa.gov, Ralph.Kahn[at]nasa.gov |
| 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 |