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.

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