This data is covered by a UK Open Government Licence (http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/). Further by downloading this data the user acknowledges that they agree with the NERC data policy (http://www.nerc.ac.uk/research/sites/data/policy.asp), and the following conditions:

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

Ross, N., Bingham, R., Ferraccioli, F., Jordan, T., Le Brocq, A., Rippin, D., & Siegert, M. (2021). Processed airborne radio-echo sounding data from the IMAFI survey covering the Institute and Moller ice streams and the Patriot Hills, West Antarctica (2010/2011) (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/F32B298B-7906-4360-9E34-16739AF73BB7

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.

This data is covered by a UK Open Government Licence (http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/). Further by downloading this data the user acknowledges that they agree with the NERC data policy (http://www.nerc.ac.uk/research/sites/data/policy.asp), and the following conditions:

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

Ross, N., Bingham, R., Ferraccioli, F., Jordan, T., Le Brocq, A., Rippin, D., & Siegert, M. (2021). Processed airborne radio-echo sounding data from the IMAFI survey covering the Institute and Moller ice streams and the Patriot Hills, West Antarctica (2010/2011) (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/F32B298B-7906-4360-9E34-16739AF73BB7

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.

- Line spacing: 7.5 km

- Trace spacing (post-processed data): ~10 m

- Vertical resolution: ~8.4 m

- Radar centre frequency: 150 MHz

- Radar bandwidth: 12 MHz

- Radar Receiver vertical sampling frequency: 22 MHz

- Absolute GPS positional accuracy: ~0.1 m (relative accuracy is one order of magnitude better). Banking angle was limited to 10 degrees during aircraft turns to avoid phase issues between GPS receiver and transmitter.

Please note:

- The surface and bed pick information (surface and bed elevation, ice thickness, etc.) can be found at: https://doi.org/10.5285/7946c497-72fc-41cb-a9b2-bf9980efe156.

- The SEGY files for the SAR-processed chirp data can be found at: https://doi.org/10.5285/8a975b9e-f18c-4c51-9bdb-b00b82da52b8.

However, note that the following issues were found with the DOI above:

a) The ''IceSurfacePositioning'' files suffered from duplicated and/or missing values throughout which required fixing by re-connecting the trace time between the surface files and the native GPS files.

b) The X/Y values found in the ''SEGY'' files were not geospatially accurate.

c) Only SAR-chirp SEGY (DLRsar) files are provided, however the pulse-data and another version of the processed chirp (cHG) had not yet been released.

The datasets found here have been considerably curated and improved, and thus can be considered the latest and full dataset.