MODIS/Terra Near Real Time (NRT) L3 Value-added Aerosol Optical DepthEntry ID: MODAODHD_C5_NRT
Abstract: MODIS was launched aboard the Terra satellite on December 18, 1999 (10:30 am equator crossing time) as part of NASA's Earth Observing System (EOS) mission. MODIS with its 2330 km viewing swath width provides almost daily global coverage. It acquires data in 36 high spectral resolution bands between 0.415 to 14.235 micron with spatial resolutions of 250m(2 bands), 500m(5 bands),and 1000m (29 ... bands). MODIS sensor counts, calibrated radiances, geolocation products and all derived geophysical atmospheric and ocean products are archived at various DAACs and has been made available to public since April 2000.
The shortname for this level-3 MODIS aerosol product is MODAODHD. The Naval Research Laboratory and the University of North Dakota developed this value-added aerosol optical depth dataset based on MODIS Level 2 aerosol products. MODAODHD is a gridded product and is specifically designed for quantitative applications including data assimilation and model validation. It is available through LANCE-MODIS. It offers several enhancements over the MODIS Level 2 data on which it is based. These enhancements include stringent filtering to reduce outliers, eliminate cloud contamination, and exclude conditions where aerosol detection is likely to be inaccurate; reduction of systematic biases over land and ocean by empirical corrections; reduction of random variation in AOD values by spatial averaging; quantitative estimation of uncertainty for each AOD data point.
he MxDAODHD granules are produced every six hours, and time-stamped 00:00, 06:00, 12:00, and 18:00 (all times UTC). Each granule includes MODIS observations from +/-3 hours from the timestamp (e.g. 12:00 product includes MODIS data from 09:00-15:00 UTC). Production is initiated as soon as the Level 2 inputs become available in the LANCE system.
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Data Set Citation
Dataset Originator/Creator: MODIS Adaptive Processing System (MODAPS) Services
Dataset Title: MODIS/Terra Near Real Time (NRT) value-added Aerosol Optical Depth Product
Dataset DOI: 10.5067/MODIS/MODAODHD.051Online Resource: http://earthdata.nasa.gov/about-eosdis/news/nrt-value-added-modis-a...
Start Date: 2014-04-17Stop Date: 2014-04-24
Latitude Resolution: 0.5 deg
Longitude Resolution: 0.5 degree
Horizontal Resolution Range: 10 km - < 50 km or approximately .09 degree - < .5 degree
Temporal Resolution: 6 hr
Temporal Resolution Range: Hourly - < Daily
ATMOSPHERE > AEROSOLS > AEROSOL BACKSCATTER
ATMOSPHERE > AEROSOLS > AEROSOL EXTINCTION
ATMOSPHERE > AEROSOLS > AEROSOL OPTICAL DEPTH/THICKNESS
ATMOSPHERE > AEROSOLS > AEROSOL OPTICAL DEPTH/THICKNESS > ANGSTROM EXPONENT
ATMOSPHERE > AEROSOLS > AEROSOL PARTICLE PROPERTIES
ATMOSPHERE > AEROSOLS > AEROSOL RADIANCE
ATMOSPHERE > AEROSOLS > CARBONACEOUS AEROSOLS
ATMOSPHERE > AEROSOLS > CLOUD CONDENSATION NUCLEI
ATMOSPHERE > AEROSOLS > DUST/ASH/SMOKE
ATMOSPHERE > AEROSOLS > NITRATE PARTICLES
ATMOSPHERE > AEROSOLS > ORGANIC PARTICLES
ATMOSPHERE > AEROSOLS > PARTICULATE MATTER
ATMOSPHERE > AEROSOLS > SULFATE PARTICLES
ATMOSPHERE > ATMOSPHERIC RADIATION > OPTICAL DEPTH/THICKNESS
ATMOSPHERE > ATMOSPHERIC RADIATION > RADIATIVE FLUX
ATMOSPHERE > ATMOSPHERIC RADIATION > REFLECTANCE
ISO Topic Category
Quality The 'version 051' or 'collection 051' product is the latest version available. The quality of this version 051 product is established as 'Validated' . This means its accuracy has been assessed over a widely distributed set of locations and time periods via several ground-truth and validation efforts. Results are peer-reviewed and published at scientific conferences and workshops.
Use Constraints Near real-time products are generated and available to registered users via FTP with an average latency of less than 3 hours. These products should be used in fields where timeliness of data is vital to the program, such as numerical weather prediction and forecasting, monitoring of natural hazards, disaster relief, agriculture and homeland security.
... Standard science products should be used for latency independent research and applications, long term studies and trend analyses. Standard products are created using the best available ancillary, calibration and ephemeris information and are an internally consistent, well-calibrated record of the Earth’s geophysical properties to support science. MODIS standard products are available from LAADS Web at:
Data Set Progress
Hyer, E. J., J. S. Reid, and J. Zhang (2011), An over-land aerosol optical depth data set for data assimilation by filtering, correction, and aggregation of MODIS Collection 5 optical depth retrievals, Atmospheric Measurement Techniques, 4, 379-408, doi: 10.5194/amt-4-379-2011.
Levy, R. C., L. A. Remer, S. Mattoo, E. F. Vermote, and Y. J. Kaufman (2007), Second-generation operational algorithm: ... Retrieval of aerosol properties over land from inversion of Moderate Resolution Imaging Spectroradiometer spectral reflectance, J. Geophys. Res.-Atmos., 112(D13), D13211.
Remer, L. A., et al. (2005), The MODIS aerosol algorithm, products, and validation, J. Atmos. Sci., 62(4), 947-973.
Shi, Y., Zhang, J., Reid, J. S., Holben, B., Hyer, E. J., and Curtis, C.: An analysis of the collection 5 modis over-ocean aerosol optical depth product for its implication in aerosol assimilation, Atmos. Chem. Phys., 11, 557-565, 10.5194/acp-11-557-2011, 2011.
Zhang, J. L., and Reid, J. S.: MODIS aerosol product analysis for data assimilation: Assessment of over-ocean level 2 aerosol optical thickness retrievals, J. Geophys. Res.-Atmos., 111, 2006.
Zhang, J. L., Reid, J. S., Westphal, D. L., Baker, N., and Hyer, E. J.: A System for Operational Aerosol Optical Depth Data Assimilation over Global Oceans, Journal of Geophysical Research, 113, doi:10.1029/2007JD009065, 2008.
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 2013-01-07
Last DIF Revision Date: 2014-02-25