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Polar Waveform Data Reference Set from Seasat Altimeter Sensor Data Record Entry ID: ADF_PDRS |
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Summary
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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. |
| N: -60.0 | S: -90.0 | E: 180.0 | W: -180.0 |
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| N: 90.0 | S: 60.0 | E: 180.0 | W: -180.0 |
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Temporal Coverage
| Start Date: 1978-07-24 |
| Stop Date: 1978-08-11 |
Location Keywords
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OCEAN
> ARCTIC OCEAN
OCEAN > SOUTHERN OCEAN CONTINENT > NORTH AMERICA > GREENLAND CONTINENT > ANTARCTICA GEOGRAPHIC REGION > ARCTIC GEOGRAPHIC REGION > POLAR |
Science Keywords
| CRYOSPHERE >GLACIERS/ICE SHEETS >ICE SHEETS [Definition] |
| TERRESTRIAL HYDROSPHERE >GLACIERS/ICE SHEETS >ICE SHEETS [Definition] |
| SPECTRAL/ENGINEERING >RADAR >SENSOR COUNTS [Definition] |
ISO Topic Category
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GEOSCIENTIFIC INFORMATION
IMAGERY/BASE MAPS/EARTH COVER INLAND WATERS |
Platform
| SEASAT 1 >Ocean Dynamics Satellite [Information] |
Instrument
| ALTIMETERS [Information] |
Keywords
| GREENLAND |
| IDN_NODE ESRIN/EODC |
Originating Center
| EODC |
Data Center
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NERC Earth Observation Data Centre, Natural Environment Research Council, United Kingdom
[Information]
Data Center URL: http://www.neodc.rl.ac.uk/ Dataset ID: PDRS > Polar Data Reference Set
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Personnel
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MARK
D.
ELKINGTON Role: INVESTIGATOR Phone: +44 1252 721444 Email: marke at eos.co.uk Contact Address: Earth Observation Sciences Broadmede Farnham Business Park City: Farnham Province or State: Surrey Postal Code: GU9 8QL Country: UK |
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BRIAN
THOMAS Role: DIF AUTHOR Role: TECHNICAL CONTACT Phone: +44 1252 721444 Fax: +44 1252 712552 Email: briant at eos.co.uk Contact Address: Earth Observation Sciences Broadmede Farnham Business Park Farnham Surrey GU9 8QL, UK |
Creation and Review Dates
DIF Creation Date:
2005-08-08
Last DIF Revision Date:
2008-08-14
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