Date (Creation)

2017-06-16

Date (Revision)

2017-06-16

Date (Publication)

2017-06-16

Date (released)

2017-06-16

Edition

1

Unique resource identifier

https://doi.org/10.5285/8a975b9e-f18c-4c51-9bdb-b00b82da52b8

Codespace

doi

Unique resource identifier

GB/NERC/BAS/PDC/00937

Codespace

https://data.bas.ac.uk/

Unique resource identifier

NE/G013071/1

Codespace

award

Other citation details

Please cite this item as: None

Credit

No credit.

Status

Completed

Point of contact

Organisation name	Individual name	Electronic mail address	Role
Imperial College London; South Kensington Campus, London SW7 2AZ	Siergert, Martin		Author
British Antarctic Survey, Natural Environment Research Council; Cambridge, CB3 0ET, UK.	Corr, Hugh		Author
Newcastle University; NE1 7RU, United Kingdom.	Ross, Neil		Author
British Antarctic Survey, Natural Environment Research Council; Cambridge, CB3 0ET, UK.	Jordan, Tom		Author
British Antarctic Survey, Natural Environment Research Council; Cambridge, CB3 0ET, UK.	Robinson, Carl		Author
Imperial College London; South Kensington Campus, London SW7 2AZ	Jeofry, Hafeez		Author
British Antarctic Survey, Natural Environment Research Council; Cambridge, CB3 0ET, UK.	Ferraccioli, Fausto		Author
University of Edinburgh; Edinburgh EH8 9YL, UK.	Bingham, Robert		Author
University of Exeter; Exeter, EX4 4RJ, UK.	Le Brocq, Anne		Author
University of York; York, YO10 5NG, UK.	Rippin, David		Author
NERC EDS UK Polar Data Centre		PDCServiceDesk@bas.ac.uk	Point of contact

Maintenance and update frequency

As needed

Maintenance note

Completed

Global Change Master Directory (GCMD) Science Keywords

• EARTH SCIENCE > Cryosphere > Glaciers/Ice Sheets > Glacier Motion/Ice Sheet Motion
• EARTH SCIENCE > Cryosphere > Glaciers/Ice Sheets > Glacier Thickness/Ice Sheet Thickness
• EARTH SCIENCE > Cryosphere > Glaciers/Ice Sheets > Glacier Topography/Ice Sheet Topography

Theme

• Ice thickness

• Institute Ice Stream

• Moller Ice Stream

• PASIN

• Radargram

• Radio-echo sounding (RES)

• West Antarctica

Place

• Institute and Moller ice streams, West Antarctica Antarctica

GEMET - INSPIRE themes, version 1.0

• Elevation

Access constraints

Other restrictions

Other constraints

no limitations to public access

Access constraints

Other restrictions

Other constraints

no limitations

Use constraints

License

Other constraints

Open Government Licence v3.0

Use constraints

Other restrictions

Other constraints

This data is governed by the NERC Data Policy: https://www.ukri.org/who-we-are/nerc/our-policies-and-standards/nerc-data-policy/

Use constraints

Other restrictions

Other constraints

This data is governed by the NERC data policy and supplied under Open Government Licence v.3

Use constraints

Other restrictions

Other constraints

No restrictions apply.

Unique resource identifier

url

Codespace

url

Association Type

Cross reference

Unique resource identifier

url

Codespace

url

Association Type

Cross reference

Unique resource identifier

doi

Codespace

doi

Association Type

Cross reference

Unique resource identifier

doi

Codespace

doi

Association Type

Cross reference

Unique resource identifier

doi

Codespace

doi

Association Type

Cross reference

Spatial representation type

Text, table

Language

English

Character set

UTF8

Topic category

• Environment
• Geoscientific information

Begin date

2010-12-23

End date

2011-01-12

Supplemental Information

It is recommended that careful attention be paid to the contents of any data, and that the author be contacted with any questions regarding appropriate use. If you find any errors or omissions, please report them to polardatacentre@bas.ac.uk.

Title

European Petroleum Survey Group (EPSG) Geodetic Parameter Registry

Date (Publication)

2008-11-12

Cited responsible party

Organisation name	Individual name	Electronic mail address	Role
European Petroleum Survey Group		EPSGadministrator@iogp.org	Publisher

Unique resource identifier

urn:ogc:def:crs:EPSG::3031

Version

6.18.3

Hierarchy level

Dataset

Statement

Methodology:

Radio-echo sounding (RES) data were acquired over the Institute and Moller ice streams in the Weddell Sea sector of West Antarctica during the Institute-Moller Antarctic Funding Initiative (IMAFI) project from 23rd December 2010 to 9th January 2011. RES data were acquired with the British Antarctic Survey (BAS) Polarimetric radar Airborne Science Instrument (PASIN) radar, using the BAS Twin Otter aircraft "Bravo Lima" as the aerogeophysical platform. The PASIN antenna array is an eight-element folded dipole array attached below the starboard and port wings for reception and transmission. In addition to RES data, the project acquired aerogravity, aeromagnetic, LiDAR, GPS and radar altimeter data. A high-resolution survey grid, with primary line-spacing of 7.5 km, and tielines at 25 km spacing, was acquired over the central part of the ice stream catchments. Additional exploratory aerogeophysical flight lines were acquired to connect the IMAFI survey to existing surveys in adjacent ice streams catchments (e.g. Pine Island Glacier). The survey was flown in a stepped pattern, to achieve level flight that was required for simultaneous acquisition of airborne gravity data. Most data were acquired with a ground clearance <500 m.

The BAS PASIN radar operates at a centre frequency of 150 MHz (Corr et al., 2007). The system transmits interleaved pulse and CHIRP waveforms, the former designed to resolve near-surface internal layering, and the latter for imaging of bed topography in areas of thick ice. The data described here were processed from the CHIRP dataset alone. The CHIRP has a bandwidth of 10 MHz, 4 kW of transmit power, an effective pulse repetition frequency of 312.5 Hz and a receiver sampling frequency of 22 Hz. Further detailed information describing the PASIN system can be found in Corr et al., (2007). Positioning of the aircraft was by differential GPS instruments on the aircraft, processed relative to a GPS base station at the field camp.

Data processing and analysis of the IMAFI RES data is described in detail in Ross et al., (2012) and Jeofry et al., (2018). Raw RES data were processed using Doppler processing (Hélière et al., 2007) to migrate radar-scattering hyperbola in the along-track direction, and then sampled at 13 Hz to produce along-track measurements ('traces') at ~10 m spacing. SEG-Y files of these data were produced, and imported into ProMAX, where semi-automatic picking of the ice-bed interface was undertaken by a single operator. The range from the aircraft to the ice surface was determined using the aircraft radar altimeter, or where the radar altimeter data was of poor quality, nadir LiDAR measurements. Ice thickness (in metres) was determined by multiplying the two-way travel-time between the picked ice surface and ice sheet bed by 0.168 m ns-1, and applying an approximately 10 m correction for the firn layer (Ross et al., 2012). Values of ice surface and bed elevation were then calculated relative to the WGS84 ellipsoid. The spatial reference system was WGS84 EPSG4326.

Note: the SEGY files available here are not georeferenced/contain error in the XY coordinates found in the binary headers. The georeferenced SEGY files for the SAR and non-SAR data can be found at: https://doi.org/10.5285/f32b298b-7906-4360-9e34-16739af73bb7

Data collection:

The BAS Polarimetric radar Airborne Science Instrument (PASIN) radar operates at a centre frequency of 150 MHz, 10 MHz bandwidth and a data acquisition rate of 13 Hz giving a spatial sampling interval of ~10m. The PASIN system interleaves a pulse for imaging layering in the upper half of the ice column and CHIRP signal for imaging the deep ice column and bed topography. The system was installed on the BAS de Havilland Twin Otter aircraft with four-element folded dipole array attached below the starboard and port wings for reception and transmission, respectively.

Data quality:

Crossover analysis shows the RMS error of <18.3 m across the dataset (Ross et al., 2012; Jeofry et al., submitted).

Note: the SEGY files available here are not georeferenced/contain error in the XY coordinates found in the binary headers. The georeferenced SEGY files for the SAR and non-SAR data can be found at: https://doi.org/10.5285/f32b298b-7906-4360-9e34-16739af73bb7

Metadata

File identifier

8a975b9e-f18c-4c51-9bdb-b00b82da52b8 XML

Metadata language

English

Character set

UTF8

Hierarchy level

Dataset

Hierarchy level name

dataset

Date stamp

2017-06-16

Metadata standard name

ISO 19115 Geographic Information - Metadata

Metadata standard version

ISO 19115:2003(E)

Metadata author

Organisation name	Individual name	Electronic mail address	Role
NERC EDS UK Polar Data Centre		polardatacentre@bas.ac.uk	Point of contact