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., & Smith, A. (2020). Processed bed elevation picks from airborne radar depth sounding across Ellsworth Land (2001) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/4B2CCDA1-91EC-4C57-9AE0-07B9A387F352

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:

Radar data were collected using the "BAS-built" radar echo sounding system (Corr and Popple, 1994; Fremand, Bodart et al., 2022). The TORUS survey involved the collection of a total of approximately 9,500 km of line data along 15 flights, with 10 km spacing. The airborne ice sounding radar system used a 4 µs linear frequency modulated pulse in addition to a standard short 0.25 us pulse. Data provided here includes picks of surface and ice sheet bed elevation. Note a single flight may contain data from two or more SEGY files, identified in the SEGYname channel. Surface elevation is derived from radar altimeter for ground clearance < 750 m, and the PASIN system for higher altitudes.

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_no 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

surfElev Surface elevation (m)

bedElev Ice bed elevation, derived by subtracting tice from surfElev (m)

tIce Ice thickness, derived from bedPickLoc and surfPickLoc (m).

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

Latitude of natural origin: -71

Longitude of natural origin: 0

Scale factor at natural origin 0.994

False easting 0

False northing 2082760.109

Data quality:

The following parameters have no values: segY_name, traceNum, priNum, surfPickloc, bedPickloc