Special Sensor Microwave/Imager (SSM/I) Monthly Data Products from NCDC

Federal Geographic Data Committee (FGDC) Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Ralph Ferraro, E/RA2
Publication_Date: Unknown
Title: Special Sensor Microwave/Imager (SSM/I) Monthly Data Products from NCDC
Edition:
Geospatial_Data_Presentation_Form:
Series_Information:
Series_Name:
Issue_Identification:
Publication_Information:
Publication_Place:
Publisher: NOAA/NESDIS/Office of Research and Applications
Other_Citation_Details:
Online_Linkage: http://www.ncdc.noaa.gov/oa/satellite/ssmi/ssmiproducts.html
Description:
Abstract:
The National Climatic Data Center (NCDC) home page is "http://www.ncdc.noaa.gov/". The Special Sensor Microwave/Imager (SSM/I) Dataset home page on the WWW is "http://www.ncdc.noaa.gov/ol/satellite/ssmi/ssmiproducts.html". For annonymous ftp, ftp.ncdc.noaa.gov, cd /pub/data/ssmi/1deg (1 degree), cd /pub/data/ssmi/25deg (2.5 degree). The Defense Satellite Meteorological Program (DMSP) Special Sensor Microwave/Imager(SSM/I) became operational in July 1987 on the F-8 satellite. Subsequent SSM/I's have been flown on the F-10 (November 1990), F-11 (December 1991), F-12 (August 1994), and most recently, F-13 (March 1995) satellites. The SSM/I is a seven channel passive microwave radiometer operating at four frequencies (19,35, 22,235, 37.0, and 85.5 GHz) and dual-polarization (except at 22.235 GHz which is V-polarization only). Researchers in the Microwave Sensing Group (MSG) of the Land Sciences Branch (LSB) are actively involved in SSM/I algorithm development and validation, and the application of such algorithms for weather forecasting and analysis, and CLIMATE EVALUATION. Additionally, the SSM/I is being used to develop algorithms for use on the NOAA-K,L,M Advanced Microwave Sounding Unit (AMSU), which will contain some frequencies similar to those on the SSM/I (e.g., 23.8, 31.4, and 89.0 GHz), but will not have polarization information. These SSM/I products are useful for evaluating the mean climate state, it's interannual and seasonal variations, and the detection of anomalies associated with ENSO and regional climatic variations. The MSG has assembled a time series of the entire SSM/I archive, which includes data from July 1987 to the present. Monthly average products are produced for precipitation, cloud liquid water, total precipitable water, snow cover, sea-ice cover, and ocean surface wind speed. A) 1-Degree Products The files have the following naming convention: ppp.yy where ppp=product type and yy=year (e.g., 87 for 1987). Each field is stored as a 1440 byte record of 4-byte real variables which have been generated on a personal computer. Each record contains 360 values corresponding to each degree of longitude, with the first element corresponding to longitude 0.5 degrees East, the second 1.5 E, etc. and the last 0.5 degrees West. The first record contains data centered at latitude 89.5 degrees South, the second record contains data centered at 88.5 S, etc. and the last 89.5 N. Missing data are indicated by a value of -999.0. The first 180 records in the data set correspond to January of that year, the next 180 is February, etc. The total length of each annual data set is 180*1440*12=3,110,400 bytes. The following describes the content of the 1 degree gridded files: 1. cfr.yy - Monthly mean cloud fraction (0 - 1.0) 2. ice.yy - Monthly mean sea-ice cover (0 - 100 percent) 3. lwp.yy - Monthly mean liquid water path (1000 * mm) 4. pfr.yy - Monthly mean rain fraction (0 - 1.0) 5. pre.yy - Monthly rainfall (mm) 6. snw.yy - Monthly mean snow cover fraction (0 - 1.0 percent) 7. ssa.yy - Monthly mean sampling fraction (0 - 1.0) 8. win.yy - Monthly mean surface wind speed (m/sec) 9. wvp.yy - Monthly mean total precipitable water (mm) B) 2.5-Degree Products The files have the following naming convention: ppp.mon where ppp=product type. Each field is stored as a 576 byte record of 4-byte real variables which have been generated on a personal computer. Each record contains 144 values corresponding to each 2.5 degree of longitude, with the first element corresponding to longitude 1.25 degrees East, the second 2.5 E, etc. and the last 1.25 degrees West. The first record contains data centered at latitude 88.75 degrees South, the second record contains data centered at 86.25 S, etc. and the last 88.75 N. Missing data are indicated by a value of -999.0. The first 72 records in the data set correspond to January 1987, 72 is February 1987, etc. and the last 72 records correspond to December 1995. The total length of each data set is 72*576*9=4,478,976 bytes. The following describes the content of the 2.5 degree gridded files: 1. cfr.yy - Monthly mean cloud fraction (0 - 1.0) 2. lwp.yy - Monthly mean liquid water path (1000*mm) 3. pf1.yy - Monthly mean rain fraction (0 - 1.0) using 85 GHz scattering algorithm over land, scattering/emission over ocean (ALG#1) 4. pr1.yy - Monthly rainfall (mm) using ALG#1 5. pf2.yy - Monthly mean rain fraction (0 - 1.0) using 37 GHz scattering algorithm over land, emission over ocean (ALG#2) 6. pr2.yy - Monthly rainfall (mm) using ALG#2 7. ssa.yy - Monthly mean sampling fraction (0 - 1.0) NOTES a. If the data is used in other computer environments, the data may have to be byte-swapped (e.g., byte 1 becomes byte 4, byte 2 becomes byte 3, etc.). b. The products are generated from a single satellite and contain the following: F8 satellite: July 1987 - June 1991 F11 satellite: January 1992 - May 1995 F13 satellite: June 1995 - present There are some missing data periods as noted above. The overpass times of each of these satellites is approximately 6am/6pm local time.
Purpose:
Not Available
Supplemental_Information:
Not Available
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19870701
Ending_Date: Unknown
Currentness_Reference:Unknown
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Description_of_Geographic_Extent:
Bounding_Coordinates:
West_Bounding_Coordinate: -180.0
East_Bounding_Coordinate: 180.0
North_Bounding_Coordinate: 90.0
South_Bounding_Coordinate: -90.0
Keywords:
Theme:
Theme_Keyword_Thesaurus: GCMD SCIENCE PARAMETERS
Theme_Keyword_Thesaurus: GCMD PLATFORM
Theme_Keyword_Thesaurus: GCMD INSTRUMENT
Theme_Keyword_Thesaurus: PROJECT
Theme_Keyword_Thesaurus: ANCILLARY KEYWORDS
Theme_Keyword_Thesaurus: ISO TOPIC CATEGORY
Theme_Keyword: EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC WATER VAPOR > PRECIPITABLE WATER
Theme_Keyword: EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC WINDS > SURFACE WINDS
Theme_Keyword: EARTH SCIENCE > ATMOSPHERE > CLOUDS > CLOUD PROPERTIES > CLOUD FREQUENCY
Theme_Keyword: EARTH SCIENCE > ATMOSPHERE > CLOUDS > CLOUD MICROPHYSICS > CLOUD LIQUID WATER/ICE
Theme_Keyword: EARTH SCIENCE > ATMOSPHERE > CLOUDS > CLOUD MICROPHYSICS > CLOUD PRECIPITABLE WATER
Theme_Keyword: EARTH SCIENCE > ATMOSPHERE > PRECIPITATION > LIQUID WATER EQUIVALENT
Theme_Keyword: EARTH SCIENCE > ATMOSPHERE > PRECIPITATION > PRECIPITATION AMOUNT
Theme_Keyword: EARTH SCIENCE > ATMOSPHERE > PRECIPITATION > PRECIPITATION RATE
Theme_Keyword: EARTH SCIENCE > ATMOSPHERE > PRECIPITATION > RAIN
Theme_Keyword: EARTH SCIENCE > CRYOSPHERE > SEA ICE > SEA ICE CONCENTRATION > ICE COMPACTNESS
Theme_Keyword: EARTH SCIENCE > CRYOSPHERE > SNOW/ICE > SNOW COVER
Theme_Keyword: EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > SNOW/ICE > SNOW COVER
Theme_Keyword: EARTH SCIENCE > OCEANS > OCEAN WINDS > SURFACE WINDS
Theme_Keyword: EARTH SCIENCE > OCEANS > SEA ICE > SEA ICE CONCENTRATION
Theme_Keyword: DMSP 5D-2/F10 > DEFENSE METEOROLOGICAL SATELLITE PROGRAM-F10
Theme_Keyword: DMSP 5D-2/F11 > DEFENSE METEOROLOGICAL SATELLITE PROGRAM-F11
Theme_Keyword: DMSP 5D-2/F12 > DEFENSE METEOROLOGICAL SATELLITE PROGRAM-F12
Theme_Keyword: DMSP 5D-2/F13 > DEFENSE METEOROLOGICAL SATELLITE PROGRAM-F13
Theme_Keyword: DMSP 5D-2/F8 > DEFENSE METEOROLOGICAL SATELLITE PROGRAM-F8
Theme_Keyword: SSMI > SPECIAL SENSOR MICROWAVE/IMAGER
Theme_Keyword: ESIP > EARTH SCIENCE INFORMATION PARTNERS PROGRAM
Theme_Keyword: Climate Evaluation
Theme_Keyword: Cloud Liquid Water
Theme_Keyword: Grid Data
Theme_Keyword: Monthly Data
Theme_Keyword: Ocean Surface Wind Speed
Theme_Keyword: Sea-ice Cover
Theme_Keyword: Snow Cover
Theme_Keyword: Total Precipitable Water
Theme_Keyword: Weather Forecasting
Theme_Keyword: Tems
Theme_Keyword: Gtos
Theme_Keyword: G3os/
Theme_Keyword: CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
Theme_Keyword: GEOSCIENTIFIC INFORMATION
Theme_Keyword: INLAND WATERS
Theme_Keyword: OCEANS
Place:
Place_Keyword_Thesaurus: GCMD
Place_Keyword: GEOGRAPHIC REGION > GLOBAL
Place_Keyword: VERTICAL LOCATION > BOUNDARY LAYER
Place_Keyword: VERTICAL LOCATION > SEA SURFACE
Place_Keyword: VERTICAL LOCATION > TROPOSPHERE
Temporal:
Temporal_Keyword_Thesaurus: GCMD
Temporal_Keyword: Monthly
Temporal_Keyword: Monthly - < Annual
Access_Constraints: Not Available
Use_Constraints:
Not Available
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: RALPH FERRARO
Contact_Position: INVESTIGATOR
Contact_Address:
Address_Type: Mailing and Physical Address
Address: ESSIC/CICS
Address: 2207 Computer and Space Sciences Building
Address: University of Maryland
City: College Park
State_or_Province: MD
Country: USA
Contact_Electronic_Mail_Address: Ralph.Ferraro@noaa.gov
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Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Problem Areas a. The 2.5 degree pr2 and pf2 products have artifacts along coastlines and the sea-ice boundary. These are due to the larger footprint sizes of the lower frequency channels (e.g., 19 GHz) used in the retrievals. b. The 1 degree rainfall product does not make a distinction between "zero" rain and "indeterminate" rain (due to snow and ice cover), which is indicated as zero rain. It is done within the 2.5 degree products.
Logical_Consistency_Report:
Not Available
Completeness_Report:
Not Available
Lineage:
Process_Step:
Process_Description:
Not Available
Process_Date: Unknown
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Spatial_Reference_Information:
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Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: DOC/NOAA/NESDIS/NCDC > National Climatic Data Center, NESDIS, NOAA, U.S. Department of Commerce
Contact_Person: NCDC CUSTOMER SERVICE
Contact_Position: DATA CENTER CONTACT
Contact_Address:
Address_Type: Mailing and Physical Address
Address: 151 Patton Avenue, Room 120
City: Asheville
State_or_Province: NC
Postal_Code: 28801-5001
Country: USA
Contact_Voice_Telephone: 828-271-4800
Contact_Facsimile_Telephone: 828-271-4876
Contact_Electronic_Mail_Address: ncdc.orders@noaa.gov
Resource_Description: RALPH_SSMI
Distribution_Liability:
Not Available
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://www.ncdc.noaa.gov/
Access_Instructions:
DATA CENTER URL
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://www.ncdc.noaa.gov/oa/satellite/ssmi/ssmipro...
Access_Instructions:
Access the Special Sensor Microwave/Imager (SSM/I) Monthly Data Products from NCDC. Special Sensor Microwave/Imager (SSM/I) Monthly Data Products from NCDC
Fees: Not Available
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Metadata_Reference_Information:
Metadata_Date:
Metadata_Review_Date: 20110721
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: SCOTT A. RITZ
Contact_Position: DIF AUTHOR
Contact_Address:
Address_Type: Mailing and Physical Address
Address: NASA Goddard Space Flight Center
Address: Global Change Master Directory
City: Greenbelt
State_or_Province: Maryland
Postal_Code: 20771
Country: USA
Contact_Voice_Telephone: 301-614-5126
Contact_Facsimile_Telephone: 301-614-5268
Contact_Electronic_Mail_Address: Scott.A.Ritz@nasa.gov
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
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