Processed bed elevation picks from airborne radar depth sounding across the Dufek Massif, Pensacola Mountains (1998/99 season)

A British Antarctic Survey Twin Otter and survey team acquired 8,300 line-km of aerogeophysics data during the Austral summer of 1998/99. Gravity and radio-echo data were acquired simultaneously with the magnetic data at a compromise constant barometric height of 2,200 m, which provides a terrain clearance of 100 m over the highest peaks. Two separate surveys were conducted; one at 5 km line spacing (tie lines at 20 km) over and stretching beyond the southern extent of the Forrestal range (main survey), and one at 2 km line spacing (tie lines at 8 km) covering the Dufek Massif (detailed survey).

Ashtech Z12 dual frequency GPS receivers were used for survey navigation. Pseudorange data were supplied to a Picodas PNAV navigation interface computer, which was used to guide the pilot along the pre-planned survey lines. The actual flight path was recovered, using carrier-phase, continuous, kinematic GPS processing techniques. All pseudorange navigation data were recorded at 1 Hz on a Picodas PDAS 1000, PC-based data acquisition system.

We present here the processed bed elevation picks from airborne radar depth sounding collected using the "BAS-built" radar system (Corr and Popple, 1994; Fremand, Bodart et al., 2022), which used a 4 us linear frequency modulated pulse in addition to a standard short 0.25 us pulse

Data are provided as XYZ ASCII line data.

Date (Creation): 2020-06-29

Date (Revision): 2020-06-29

Date (Publication): 2020-06-29

Date (released): 2020-06-29

Edition: 1.0

Unique resource identifier: https://doi.org/10.5285/5e2cf315-9265-4605-8643-382f2557009b

Codespace: doi

Unique resource identifier: GB/NERC/BAS/PDC/01344

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

Other citation details: Please cite this item as: Corr, H. (2020). Processed bed elevation picks from airborne radar depth sounding across the Dufek Massif, Pensacola Mountains (1998/99 season) (Version 1.0) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/5e2cf315-9265-4605-8643-382f2557009b

Credit: No credit.

Status: Completed

Point of contact

Organisation name	Individual name	Electronic mail address	Role
British Antarctic Survey	Corr, Hugh		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

Theme

Aerogeophysics
Antarctica
Radar
Surface elevation

Place

Dufek Massif Antarctica
Pensacola Mountains Antarctica

GEMET - INSPIRE themes, version 1.0

Elevation

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Other constraints: no limitations to public access

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Other constraints: Open Government Licence v3.0

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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 (), and the following conditions:

1. To cite the data in any publication as follows:

Corr, H. (2020). Processed bed elevation picks from airborne radar depth sounding across the Dufek Massif, Pensacola Mountains (1998/99 season) (Version 1.0) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/5E2CF315-9265-4605-8643-382F2557009B

2. The user recognizes the limitations of data. Use of the data is at the users' own risk, and there is no warranty as to the quality or accuracy of any data, or the fitness of the data for your intended use. The data are not necessarily fully quality assured and cannot be expected to be free from measurement uncertainty, systematic biases, or errors of interpretation or analysis, and may include inaccuracies in error margins quoted with the data.

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Spatial representation type: Text, table

Language: English

Character set: UTF8

Topic category

Elevation
Geoscientific information

Begin date: 1999-01-20

End date: 1999-02-12

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

Distributor

Distributor contact

Organisation name	Individual name	Electronic mail address	Role
NERC EDS UK Polar Data Centre		PDCServiceDesk@bas.ac.uk	Distributor

Distributor format

Name	Version
text/plain

Units of distribution: bytes

Transfer size: 57671680

OnLine resource

Protocol	Linkage	Name
WWW:LINK-1.0-http--link	https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=5e2cf315-9265-4605-8643-382f2557009b	Get Data

Hierarchy level: Dataset

Statement: Methodology:

Data available here includes bed and surface elevation sampled from a high resolution (100 m) grid of BEDMAP2 (Fretwell et al., 2013) data along DUFEK flight lines, with ice thickness subsequently derived. Basic information on data acquisition and processing is presented in Ferris et al. (2003).

Channel description:

Basic Channels Name Description

Date UTC date (YYYY/MM/DD)

Time UTC time (HH:MM:SS.SS)

FlightID Sequential flight number and survey ID e.g. W12

Line_name Line Number e.g. LW200.1

Lon Longitude WGS 1984

Lat Latitude WGS 1984

x x projected meters*

y y projected meters*

Height_WGS1984 Aircraft altitude (meters) in WGS 1984

Radar

segy_name Radar_segy file name

TraceNum Radar segy trace number

PriNum Raw radar time

surfPickLoc Location down trace of surface pick

bedPickLoc Location down trace of bed elevation pick

surfElev Surface elevation

bedElev Picked ice bed elevation

tIce Ice thickness, derived from bedPickLoc and surfPickLoc.

*Projected coordinates (x and y) are in Lambert conic conformal with two standard parallels defined as follows:

Latitude of false origin: -80

Longitude of false origin: 80

Latitude of 1st standard parallel -83

Latitude of 2nd standard parallel -77

False easting 2000000

False northing 2000000

Positioning for the Dufek survey uses Ashtech Z12 dual frequency GPS recievers (Ferris et al, 2003). Positions are calculated for the phase centre of the aircraft antenna. All positions (Lat, lon and height) are referred to the WGS1984 ellipsoid.

Data quality:

No values are given for SurfPickLoc and bedPickLoc

We do not have all the intermediate information for this legacy data

Metadata

File identifier: 5e2cf315-9265-4605-8643-382f2557009b XML

Metadata language: English

Character set: UTF8

Hierarchy level: Dataset

Hierarchy level name: dataset

Date stamp: 2020-06-29

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

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