Date (Creation)

2020-06-23

Date (Revision)

2020-06-23

Date (Publication)

2020-06-23

Date (released)

2020-06-23

Edition

1.0

Unique resource identifier

https://doi.org/10.5285/e07d62bf-d58c-4187-a019-59be998939cc

Codespace

doi

Unique resource identifier

GB/NERC/BAS/PDC/01339

Codespace

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

Other citation details

Please cite this item as: Corr, H., & Robinson, C. (2020). Airborne radio-echo sounding of the English Coast, western Palmer Land, Antarctic Peninsula (2016/17 season) (Version 1.0) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/e07d62bf-d58c-4187-a019-59be998939cc

Credit

No credit.

Status

Completed

Point of contact

Organisation name	Individual name	Electronic mail address	Role
British Antarctic Survey	Corr, Hugh		Author
British Antarctic Survey	Robinson, Carl		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 Thickness/Ice Sheet Thickness
• EARTH SCIENCE > Cryosphere > Sea Ice > Ice Depth/Thickness
• EARTH SCIENCE > Cryosphere > Glaciers/Ice Sheets
• EARTH SCIENCE > Spectral/Engineering > Radar

Theme

• Antarctic Peninsula

• Antarctica

• PASIN

• Radar

• radio-echo sounding

Place

• Ers Ice Stream Antarctica

• Envisat Ice Stream Antarctica

• Cryosat Ice Stream Antarctica

• Grace Ice Stream Antarctica

• Sentinel Ice Stream Antarctica

• Hall Glacier Antarctica

• Nikitin Glacier Antarctica

• Lidke Ice Stream Antarctica

• Landsat Ice Stream Antarctica

• English Coast of western Palmer Land Antarctica

GEMET - INSPIRE themes, version 1.0

• Elevation
• Oceanographic geographical features

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

. Further by downloading this data the user acknowledges that they agree with the NERC data policy ().

Please cite this dataset as follows:

Corr, H., & Robinson, C. (2020). Airborne radio-echo sounding of the English Coast, western Palmer Land, Antarctic Peninsula (2016/17 season) (Version 1.0) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/E07D62BF-D58C-4187-A019-59BE998939CC

Unique resource identifier

url

Codespace

url

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

• Elevation
• Geoscientific information

Begin date

2017-01-19

End date

2017-01-22

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:

The British Antarctic Survey Polarimetric-radar Airborne Science Instrument (PASIN2) ice sounding radar system operates at a frequency of 150 MHz, using a pulse-coded waveform at an effective acquisition rate of 312.5 Hz and a bandwidth of 13 MHz. Radio-echo sounding data were collected at an average flying velocity of 55 m s-1. Along-track processing of the data results in an output data rate of 5 Hz, which produces an average spacing between radar traces of 11 m.

Range compressed data were processed using unfocused SAR. The ice/bed reflector was determined in PROMAX software, where the first-break picker tool was used to automatically determine the onset of the bed reflector. These picks were then manually assessed and corrected where necessary. An electromagnetic wave propagation speed in ice of 0.168 m ns-1 and a constant firn correction of 10 m were used for topographic correction. Ice thickness was calculated by subtracting surface elevation measurements (derived from radar/laser altimeters for aircraft terrain clearance) from bed reflector depth picks.

Data description:

The data is composed of three folders:

- 4microseconds: Contains data designed to image the bed.

Pulse length of 4 microseconds

- 1microsecond: Contains data designed to enhance imaging of internal layers

Pulse length of 1 microsecond

Data for 4us and 1us are composed of both SEGY and TXT files.

Column desciption of txt file:

1.traceNum, this is the SEGY trace number

2. PriNum, radar shot number

3. Time, in format YYYYMMDD T hhmmss.ddd

4. dateNum, in a convenient Matlab format

5. radSeg, radar file segment (20 second length)

Name descriptions for segy are based on the original archive file names, so:

fXXy_TxP1234_Rx1234_L4_ns1536_skip25_DBS5Hz

fXXy_TxP1234_RxB_L1_C_ns1536_skip25_DBS5Hz

fXX = flight number

y = radar radar start/restart value i.e. a=1 continuous run, b=1 restart, 2=second restart etc. this is more a through back to old incarnations of pasin that used tapes and spinning disk that sometime caused the system to stop/freeze due write errors etc. we still include as it is useful for calibration flights are flights with varied setups.

TxP1234=is which antennas did the transmitting [P=port, S=starboard, B=belly plus antenna numbers]

Rx1234= is which antennas did the receiving [P=port, S=starboard, B=belly, plus antenna numbers, no number represents combining of antenna array]

Lx=Length of transmit chirp i.e. 1us or 4us

C=combined (if used) this is an addition from the raw data naming convention.

ns1536=number of samples per trace during processing. (pri =64us, fs=24MHz)

skip25=basically the decimation value when processing

DBS5Hz=final presented data frequency i.e. 5Hz

Navigation information is not held in the segy file header and can be derived from the bed pick files using traceNum or PriNum as a key to link the two datasets

- Bed picks: Contains bed picks data.

Channel description:

1.traceNum, this is the SEGY trace number

2. Lon, Longitude

3. Lat, Latitude

4. Time, in format YYYYMMDD T hhmmss.ddd

5. dateNum, in a convenient Matlab format

6. PriNum, radar shot number

7. Eht, height of aircraft above WGS84 ellipsoid (m)

8. terrainClear, height of aircraft above the terrain (m)

9. surfElev, height of ice surface above above WGS84 ellipsoid (m)

10. surfSource, source of elevation measurements 0 = lidar, 1 = interpolated lidar for gaps ~ 55 m, 2 = from ice sounding radar

11. bedElev, height of ice bed above above WGS84 ellipsoid (m). Derived from surface minus ice thickness

12. iceThick, ice thickness (m) 168 metres/microsecond was used and 10 metres added for firn.

13. surfPickEff, the ice surface sample for the onset of the surface return

14. botPickLoc, the sample location for the onset of the bed return

15. sampOffset, the fiducal or zero radar range-sample

Data collection:

Sample collection: British Antarctic Survey Polarimetric-radar Airborne Science Instrument (PASIN2) ice sounding radar system

Processing: PROMAX

Metadata

File identifier

e07d62bf-d58c-4187-a019-59be998939cc XML

Metadata language

English

Character set

UTF8

Hierarchy level

Dataset

Hierarchy level name

dataset

Date stamp

2020-06-23

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