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NASA Contact: Michael Goodman
Site Curator: Michael Goodman

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Web Map Service

Advanced Microwave Sounding Unit (AMSU-A) Swath Web Map Service

AMSU-A is a cross-track, line-scanned instrument designed to measure scene radiances in 15 discrete frequency channels which permit the calculation of the vertical temperature and moisture profiles from about 3 millibars (~45 km) to the Earth's surface. Each scanline contains 30 overlapping cells, each with a resolution of ~3.3 degrees (50 km at nadir). This yields a swath width of 2343 km (96.66 degrees). This data set is maintained at the Global Hydrology and Climate Center located in Huntsville, Alabama, for use by scientific researchers. In an effort to provide wider dissemination of this information, ITSC has released an OGC-compliant web map service that maps AMSU-A swath data based on specific spatial and temporal requests criteria. A web map service returns the image of one specific data layer that users/applications can then overlay or merge with other data layers to create composite maps. The Open Geospatial Consortium (OGC) is an international consortium of industry, government agencies and educational institutions striving to standardize interfaces and protocols for using geospatial data.

WMS Location Information:
AMSU-A WMS Service: http://moby.itsc.uah.edu/cgi-bin/datapool/WMS/AMSUWMS.cgi
AMSU WMS Capabilities (What can the service do?)

Example AMSU WMS request
Example AMSU WMS Request:

Example of AMSU overlayed on Map Boundaries

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Special Sensor Microwave / Imager (SSM/I) Swath Web Map Service

The SSM/I is a passive microwave sensor that detects microwave radiation at four frequencies: 19.35 GHz, 22.235 GHz, 37.0 GHz, and 85.5 GHz. The 19, 37, and 85 GHz channels have dual-polarization (vertical and horizontal), while the 22 GHz channel has only vertical polarization. This yields a total of seven channels. The instrument is a conical scanning device sweeping out an approximately 1400 km wide swath as it looks forward (F8 looks backward) at an angle of about 45 degrees from vertical. The instrument scans through 102 degrees for each scanning revolution. The Global Hydrology Resource Center (GHRC) has been processing and archiving Special Sensor Microwave / Imager (SSM/I) data since 1990. Prior to May 1995, the SSM/I data source for the GHRC was the National Environmental Satellite Data and Information Service (NESDIS). Since May, 1995, the source has been the Fleet Numerical Meteorology and Oceanography Center (FNMOC). Data is obtained from FNMOC and processed at the GHRC within hours of its reception. Each day full resolution or -swath- brightness temperatures (Tb's) and reduced resolution -gridded- data sets are generated. Browse images of the gridded files are created in both HDF raster and GIF formats. HDF represents the Hierarchical Data Format, the data format standard for NASA's Earth Observing System Data and Information System.

WMS Location Information:
SSM/I WMS Service: http://moby.itsc.uah.edu/cgi-bin/datapool/WMS/SSMIWMS.cgi
SSM/I WMS Capabilities (What can the service do?)

Example SSM/I WMS Request
Example SSM/I WMS Request:

Example of SSM/I overlayed on Map Boundaries

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TRMM Microwave Imager (TMI) Swath Web Map Service

The TRMM Microwave Imager (TMI) is a 5-channel, dual-polarized, passive microwave radiometer. Microwave radiation is emitted by the Earth's surface and by water droplets within clouds. The TMI is used to measure several important meteorological parameters over sea surfaces. The TRMM orbit was selected for continuous monitoring of the tropics. To achieve this, a low inclination angle was chosen, confining the TRMM observations between 40°S and 40°N. Previous microwave radiometers were either too poorly calibrated or operated at too high of a frequency to provide a reliable estimate of SST. The TMI, a successor to the SSM/I, measures radiation at frequencies of 10.7, 19.4, 21.3, 37, 85.5 GHz. It orbits at an altitude of 218 miles, much lower than the SSM/I, thus providing better resolution. From the 5 channels of data provided by TMI, scientists calculate several parameters over ocean surfaces. This data is archived at the Global Hydrology Resource Center (GHRC) in Huntsville, Alabama.

WMS Location Information:
TMI WMS Service: http://moby.itsc.uah.edu/cgi-bin/datapool/WMS/TMIWMS.cgi
TMI WMS Capabilities (What can the service do?)

Example TMI WMS Request:

Example of TMI overlayed on Map Boundaries

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Additional Background Information

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