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Polar Waveform Data Reference Set from Seasat Altimeter Sensor Data Record

Federal Geographic Data Committee (FGDC) Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Unknown
Publication_Date: Unknown
Title: Polar Waveform Data Reference Set from Seasat Altimeter Sensor Data Record
Description:
Abstract:
The PDRS (Polar Data Reference Set) is a subset of the Seasat Altimeter sensor data record (SDR) archive maintained at the ADF (Algorithm Development Facility), part of the EODC (Earth Observation Data Centre). The aim was to provide a manageable set of polar waveforms for R&D analysis. The PDRS covers a 17-day repeat period from 24th July 1978 to 11th August 1978. Seasat was launched on 28th June 1978 carrying a five-sensor payload. The objective of the Altimeter (ALT) was to determine ocean topography with a height measurement precision of 10 cm. The ALT carrier frequency was 13.5 GHz and operated in chirp pulse mode with a 3.2 micro-second uncompressed pulse width and 3.125 ns compressed pulse width. The pulse limited footprint diameter was 1.2 km for calm seas; beam-limited footprint diameter was 22.2 km. The PDRS is sub-divided into four data types: i) Antarctic ice sheet data, ii) Antarctic sea ice data, iii) Greenland ice sheet data, and iv) Arctic sea ice data. The source of the PDRS data set was 36 tapes comprising the SDR waveform data for a 17-day repeat period. The data points of interest fall in two distinct geographic regions: south of -50 and north of 59 latitudes. In the southern region, all data with the TOIL flag set to land were extracted as Antarctic ice sheet data. In the northern region, all data with the TOIL flag set to land within Greenland (longitudes -58 W and -20 W) were extracted as Greenland ice sheet data The remaining sets of sea ice data were extracted using an algorithm based on the peakiness of the waveform which was developed by the Remote Sensing Group at Mullard Space Science Laboratories, UK. The tapes are written in 9-track, 6250-bpi format. The block format is that described in the Seast Telemetry dictionary, containing 23 waveforms packed into 2988 2-byte words. Each tape is divided into logical files separated by a file mark, one per source tape. Full tape copies will be made of this data set on request. Tape handling costs will be charged.
Purpose:
Not Available
Supplemental_Information:
REFERENCE: NASA/JPL May 1, 1979 Seasat-A data Record Tape Specification TInterface Control Document and Telemetry Dictionary Revision A 622-57
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19780724
Ending_Date: 19780811
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: -60.0
South_Bounding_Coordinate: -90.0
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: 60.0
Keywords:
Theme:
Theme_Keyword_Thesaurus: GCMD SCIENCE PARAMETERS
Theme_Keyword_Thesaurus: GCMD PLATFORM
Theme_Keyword_Thesaurus: GCMD INSTRUMENT
Theme_Keyword_Thesaurus: ANCILLARY KEYWORDS
Theme_Keyword_Thesaurus: ISO TOPIC CATEGORY
Theme_Keyword: EARTH SCIENCE > CRYOSPHERE > GLACIERS/ICE SHEETS > ICE SHEETS
Theme_Keyword: EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > GLACIERS/ICE SHEETS > ICE SHEETS
Theme_Keyword: EARTH SCIENCE > SPECTRAL/ENGINEERING > RADAR > SENSOR COUNTS
Theme_Keyword: SEASAT 1 > OCEAN DYNAMICS SATELLITE
Theme_Keyword: ALTIMETERS
Theme_Keyword: Greenland
Theme_Keyword: Idn_node Esrin/eodc
Theme_Keyword: GEOSCIENTIFIC INFORMATION
Theme_Keyword: IMAGERY/BASE MAPS/EARTH COVER
Theme_Keyword: INLAND WATERS
Place:
Place_Keyword_Thesaurus: GCMD
Place_Keyword: OCEAN > ARCTIC OCEAN
Place_Keyword: OCEAN > SOUTHERN OCEAN
Place_Keyword: CONTINENT > NORTH AMERICA > GREENLAND
Place_Keyword: CONTINENT > ANTARCTICA
Place_Keyword: GEOGRAPHIC REGION > ARCTIC
Place_Keyword: GEOGRAPHIC REGION > POLAR
Access_Constraints: Not Available
Use_Constraints:
Not Available
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: BRIAN THOMAS
Contact_Position: DIF AUTHOR
Contact_Position: TECHNICAL CONTACT
Contact_Address:
Address_Type: Mailing and Physical Address
Address: Earth Observation Sciences
Address: Broadmede
Address: Farnham Business Park
Address: Farnham
Address: Surrey GU9 8QL, UK
Contact_Voice_Telephone: +44 1252 721444
Contact_Facsimile_Telephone: +44 1252 712552
Contact_Electronic_Mail_Address: briant@eos.co.uk
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Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Not Available
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: UK/NERC/NEODC > NERC Earth Observation Data Centre, Natural Environment Research Council, United Kingdom
Contact_Person: ALAN HASKELL
Contact_Position: DATA CENTER CONTACT
Contact_Address:
Address_Type: Mailing and Physical Address
Address: CSC25 Space Dept.
Address: Defense Research Agency
Address: Farnborough
City: Hampshire
Postal_Code: GU14 6TD
Country: UK
Contact_Voice_Telephone: +44 1252 394005
Resource_Description: PDRS > Polar Data Reference Set
Distribution_Liability:
Not Available
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: Not Available
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://www.neodc.rl.ac.uk/
Access_Instructions:
DATA CENTER URL
Digital_Transfer_Option:
Fees: Not Available
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Metadata_Reference_Information:
Metadata_Date:
Metadata_Review_Date: 20161118
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: BRIAN THOMAS
Contact_Position: DIF AUTHOR
Contact_Position: TECHNICAL CONTACT
Contact_Address:
Address_Type: Mailing and Physical Address
Address: Earth Observation Sciences
Address: Broadmede
Address: Farnham Business Park
Address: Farnham
Address: Surrey GU9 8QL, UK
Contact_Voice_Telephone: +44 1252 721444
Contact_Facsimile_Telephone: +44 1252 712552
Contact_Electronic_Mail_Address: briant@eos.co.uk
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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