[Keyword='NEAR-INFRARED WATER VAPOR ESTIMATES']
MODIS/Aqua Near Real Time (NRT) Total Precipitable Water Vapor 5-Min L2 Swath 1km and 5km (Collection 005)Entry ID: MYD05_L2
Abstract: MODIS was launched aboard the Aqua satellite on May 04, 2002 (1:30 pm 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 NASA Goddard DAAC and has been made available to public since April 2000. The MODIS level-2 atmospheric precipitable water product consists of total atmospheric column water vapor amounts (and ancillary parameters) over clear land areas of the globe, over extended clear oceanic areas with the Sun glint, and above clouds over both land and ocean. These estimates are based on a near-infrared algorithm using only daytime measurements with solar zenith angle less than 72 degrees. The retrieval algorithm relies on observations of water vapor attenuation of near-infrared solar radiation reflected by surfaces and clouds. The product is produced only over areas that have reflective surfaces in the near-infrared. The infrared-derived precipitable water vapor generated for both daytime & nighttime conditions as one component of another MODIS product (MYD07) is also provided as a part of this product. The shortname for this level-2 MODIS total precipitable water vapor product is MYD05_L2 and the principal investigators for this product are MODIS scientists Dr. Bo-Cai Gao ( firstname.lastname@example.org), Dr. Paul Menzel (email@example.com), and Dr. Yoram Kaufman. MYD05_L2 product files are stored in Hierarchical Data Format (HDF-EOS). The file contains 13 gridded parameters. Each of these gridded MYD05 parameters is stored as a Scientific Data Set (SDS) within the HDF-EOS file. The Water Vapor and Quality Assurance SDS's are stored at 1 kilometer (near-infrared) and 5 kilometer (for infrared) pixel resolution. All other SDS's (those relating to time, geolocation, and viewing geometry) are stored at 5 kilometer pixel resolution. The Cloud Mask SDS, copied from the MYD35_L2 Product is stored at 1 kilometer resolution. Each file is roughly 14.6 MB in size, and the total data volume is approximately 2.9 GB/day. MODIS Data Category & Parameters Spatial & Temporal Resolution: latitude,longitude scan start time Solar and Sensor Viewing Geometry: solar zenith angle, solar azimuth angle sensor zenith angle, sensor azimuth angle Water Vapor Parameters: near-infrared estimated water vapor(1km) water vapor correction factors(1km) infrared estimated water vapor(5km) Quality Assurance & Statistical Parameters: QA flags for near-infrared retrieval(1km) QA flags for infrared retrieval(5km) cloud mask(1km) The near-infrared water vapor estimates are very sensitive to boundary layer water vapor since they are derived from atmospheric attenuation of surface reflected radiances. This product is essential to the understanding of hydrological cycle, aerosol properties, aerosol-cloud interactions, energy budget, and climate. For more information about the MYD05_L2 product, visit the MODIS-Atmosphere site at: http://modis-atmos.gsfc.nasa.gov/MOD05_L2/
Data Set Citation
Start Date: 2015-12-06
Temporal Resolution: 5-minute
ISO Topic Category
Quality Overall NRT products match to operational with some expected minor differences from use of different ancillaries and ephemeris. There aren't any data gaps or data artifacts. Information on comparison of C5 Operational and NRT Atmospheric Products is posted at: http://lance.modaps.eosdis.nasa.gov/data_products/comparison.html. Information on comparison of C6 Operational and NRT Atmospheric and Land Products is posted at: http://lance3.modaps.eosdis.nasa.gov/data_products/comparison_atmos... and http://lance3.modaps.eosdis.nasa.gov/data_products/comparison_land.....
Use Constraints None. See disclaimer: https://earthdata.nasa.gov/data/near-real-time-data/about-lance/dis....
Extended Metadata Properties
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