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., Ferraccioli, F., Jordan, T., & Robinson, C. (2020). Antarctica's Gamburtsev Province (AGAP) Project - Radio-echo sounding data (2007-2009) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/0F6F5A45-D8AF-4511-A264-B0B35EE34AF6

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 and details on survey location and design are presented in Rose et al. (2013). Radar data collection by BAS used the PASIN radar echo sounding system (table 1 (Corr et al., 2007)). USAP data was collected using a 150-MHz system with bandwidths of 15 to 20 MHz (Bell et al, 2011). Data provided here includes picks of surface and ice sheet bed elevation. BAS flights include turns and transit flights, whereas USAP data is confined to line portions only.

Small (a few minutes) time jumps are contained in a limited number of survey lines as a result of the re-booting of the PASIN system.

Note in the database split by line the sections are defined as follows L= main survey grid lines, T=main survey tie lines, P=long transits, D=turns.

Channel description:

Basic Channels

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 (note: longitudes go from 0 to 360 degrees)

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 (BAS system).

TraceNum Radar segy trace number (BAS system).

PriNum Raw radar time (BAS system).

surfPickLoc Location down trace of surface pick (BAS system).

bedPickLoc Location down trace of bed elevation pick (BAS system).

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 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

Data collection:

In total, 120, 000 line km of data were aquired from a nested survey grid with line spacing of 5km and tie lines ~ 33 km apart.