gov.noaa.ngdc.stp.dmsp:G01123 eng; USA utf8 dataset DMSP Data Manager DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce 303.497.3053 (303) 497-6513 E/GC2 325 Broadway Boulder CO 80305 USA ngdc.dmsp@noaa.gov 7:30 - 4:30 Mountain Contact Data Center pointOfContact 2015-09-18 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) DMSP SSM/I- Microwave Imager 1992-01-01 publication First SSM/I NOAA National Centers for Environmental Information publisher National Geophysical Data Center Boulder CO publisher DOD/USAF/AFWA > Air Force Weather Agency, U.S. Air Force, U.S. Department of Defense originator DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce (comp) originator https://www.ngdc.noaa.gov/dmsp/sensors/ssmi.html http SSM/I- Microwave Imager Home page for the SSM/I sensor information The SSM/I is a seven-channel, four frequency, linearly-polarized, passive microwave radiometric system which measures atmospheric, ocean and terrain microwave brightness temperatures at 19.35, 22.235, 37.0 and 85.5 GHz. The data are used to obtain synoptic maps of critical atmospheric, oceanographic and selected land parameters on a global scale. The SSM/I archive data set consists of antenna temperatures recorded across a 1,400 km conical scan, satellite ephemeris, earth surface positions for each pixel and instrument calibration. Electromagnetic radiation is polarized by the ambient electric field, scattered by the atmosphere and the Earth's surface and scattered and absorbed by atmospheric water vapor, oxygen, liquid water and ice. The SSM/I instrument consists of an offset parabolic reflector that is 24 x 26 inches fed by a seven- port horn antenna. The reflector and feed are mounted on a drum which contains the radiometers, digital data subsystem, mechanical scanning subsystem and power subsystem. The drum assembly rotates about the axis of the drum. A small mirror and a hot reference absorber are mounted on the assembly. The instrument sweeps a 450 cone around the satellite velocity vector so that the Earth incidence angle is always 540. Data are recorded during the 102.40 of the cone when the antenna beam intercepts the Earth's surface. The channel footprint varies with channel energy, position in the scan, along scan or along track direction and altitude of the satellite. The 85 GHz footprint is the smallest with a 13 x 15 km and the 19 GHz footprint is the largest at 43 x 69 km. Because the 85 GHz footprint is so small, it is sampled twice as often, i.e., 128 times a scan. One data cycle consists of 4 85 GHz scans and 2 scans of the 19, 22 and 37 GHz channels. The complete cycle takes 28 seconds and it must be complete to process the data. The SSM/I processor is queried once a second by onboard computer and the data are placed into the "TS SSP" data field. Data is ingested as sent from AFWA on a T-1 line. At the NOAA National Centers for Environmental Information (formerly National Geophysical Data Center), the "TS SSP" data are decommutated, deinterleaved, bit flipped, reordered and restructured into orbits beginning with the equatorial crossing as the satellite travels from south to north. Satellite ephemeris are computed using a physically-based, orbital mechanics model. SSM/I pixels are geolocated using the satellite ephemeris and satellite attitude corrections. Antenna temperatures are computed from instrumental counts by a linear equation, i.e., the conversion is reversible. In the decommutation step, we encountered bit reversals that occurred 1.8 - 3.4% of the time and are probably caused by ionospheric scintillation. These are identified through careful checking procedures and corrected. Archive files contain metadata by orbit and geolocated antenna temperatures. Maps-Critical Atmosphere, Ocean, & Land Parameters underDevelopment DMSP Data Manager DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce 303.497.3053 (303) 497-6513 E/GC2 325 Broadway Boulder CO 80305 USA ngdc.dmsp@noaa.gov 7:30 - 4:30 Mountain Contact Data Center pointOfContact daily EARTH SCIENCE > Spectral/Engineering > Microwave EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC DYNAMICS > Temperature EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC DYNAMICS > Precipitation EARTH SCIENCE > RADIANCE OR IMAGERY > Microwave > Brightness Temperature EARTH SCIENCE > OCEANS > DYNAMICS > Wind EARTH SCIENCE > OCEANS > DYNAMICS > Sea Ice EARTH SCIENCE > OCEANS > DYNAMICS > Brightness Temperature EARTH SCIENCE > ATMOSPHERE > HYDROLOGICAL PARAMETER > Water Vapor EARTH SCIENCE > BIOSPHERE > GEOGRAPHY AND LAND COVER > Ice EARTH SCIENCE > BIOSPHERE > GEOGRAPHY AND LAND COVER > Snow EARTH SCIENCE > BIOSPHERE > GEOGRAPHY AND LAND COVER > Surface Water theme NASA/GCMD Earth Science Keywords Snow Cover Brightness Temperatures Antenna Temperature DMSP/SSMI Sea Ice Polar Orbiters Satellite Meteorology Ocean Surface Wind Speeds theme Uncontrolled Keywords Global place NASA/GCMD Location Keywords DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce dataCentre Global Change Master Directory (GCMD) Data Center Keywords 2020-01-09 publication 9.1 NASA Goddard Space Flight Center, Earth Science Data and Information System https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords Global Change Master Directory (GCMD) Keywords The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. information custodian While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty. otherRestrictions Use Constraints: None otherRestrictions Access Constraints: No Constraints eng; USA -180 180 -90 90 1974-04-01 Entry ID: G01123 Sensor Name: SSM/I > Microwave Imager Source Name: DMSP > Defense Meteorological Satellite Program ASCII DMSP Data Manager DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce 303.497.3053 (303) 497-6513 E/GC2 325 Broadway Boulder CO 80305 USA ngdc.dmsp@noaa.gov 7:30 - 4:30 Mountain Contact Data Center pointOfContact Download available for no cost 400.00 http://spidr.ngdc.noaa.gov http Spidr interface Download data from Spidr download http://spidr.ngdc.noaa.gov repository NOAA National Centers for Environmental Information NOAA created the National Centers for Environmental Information (NCEI) by merging NOAA's National Climatic Data Center (NCDC), National Geophysical Data Center (NGDC), and National Oceanographic Data Center (NODC), including the National Coastal Data Development Center (NCDDC), per the Consolidated and Further Continuing Appropriations Act, 2015, Public Law 113-235. NCEI launched publicly on April 22, 2015. 2015-04-22T00:00:00 dataset Not Available Unknown The SSM/I processor is queried once a second by onboard computer and the data are placed into the "TS SSP" data field. Data is ingested as sent from AFWA on a T-1 line. At the NOAA National Centers for Environmental Information (formerly National Geophysical Data Center), the "TS SSP" data are decommutated, deinterleaved, bit flipped, reordered and restructured into orbits beginning with the equatorial crossing as the satellite travels from south to north. Satellite ephemeris are computed using a physically-based, orbital mechanics model. SSM/I pixels are geolocated using the satellite ephemeris and satellite attitude corrections. Antenna temperatures are computed from instrumental counts by a linear equation, i.e., the conversion is reversible. DMSP Data Manager DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce processor Source Contribution: Used the Raw Data Records Source Type: digital database file DMSP Raw Data Records (RDR) publication RDR DOD/USAF/AFWA > Air Force Weather Agency, U.S. Air Force, U.S. Department of Defense originator 1992-01-01 annually This metadata was automatically generated from the Content Standard for Digital Geospatial Metadata: Extensions for Remote Sensing Metadata standard (version FGDC-STD-012-2002) using the 2012-11-07 version of the FGDC RSE to ISO 19115-2 transform. Translated from FGDC 2014-01-31T19:22:35.816-07:00 This record was automatically modified on 2015-09-18 to include references to NCEI where applicable. NOAA National Centers for Environmental Information Metadata Specialist editor DMSP Data Manager DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce 303.497.3053 (303) 497-6513 E/GC2 325 Broadway Boulder CO 80305 USA ngdc.dmsp@noaa.gov 7:30 - 4:30 Mountain Contact Data Center pointOfContact