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:

Ferraccioli, F., Jordan, T., Ross, N., Corr, H., Leat, P., Bingham, R., Rippin, D., Le Brocq, A., & Siegert, M. (2020). Processed line aeromagnetic data over the Institute and Moller region (2010/11 season) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/03C3180B-97EF-4923-86E1-7AC9EAB99497

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:

IMAFI aeromagnetic data and details of survey design and location are presented in (Jordan et al., 2012). The dataset available here includes all channels from raw through to levelled, and draped products. Channel naming follows SCAR/ADMAP2 data release protocols. Key data processing steps are described below.

Magnetic data channels and processing flow:

MagR- Raw magnetic total field intensity data (nT).

MagC- Compensated, or low pass filtered magnetic data (nT). Adjustments to compensate for aircraft roll, pitch and yaw were applied.

RefField- Geomagnetic reference field value for which the magnetic data has been compensated. IGRF model 2010 as implemented in Geosoft (nT).

MagRTC- Compensated magnetic value adjusted for Tip tanks (where used) and geomagnetic reference field values. MagRTC= MagR- RefField (nT).

BCorr- Low pass filtered (60 minute) magnetic base station correction.

MagBRTC- calculated as MagBRTC= MagRTC- Bcorr (nT).

ACorr- Additional low pass filtering (30 fiducial cutoff) to account for any remnant noise in lines.

MagF- Final mag value before levelling. (nT)

MagL- Statistically levelled mag data. (nT)

MagL_Drape Microlevelled data draped to a uniform level of 2100m above the bed topography, using the method of (Pilkington and Thurston, 2001). (nT)

MagML- Microlevelled magnetic data following technique of (Ferraccioli et al., 1998). Note tie lines are not included in the microlevelled data channel. (nT)

Basic Channels

Line_no Line Number

Flight ID Sequential flight number

x x projected meters *

y y projected meters *

Lon Longitude WGS 1984,

Lat Latitude WGS 1984,

Height_WGS1984 Aircraft altitude (meters) in WGS 1984,

Date Date of flight in time format e.g. 2006/01/08

Time Time (UTC) of flight e.g. 23:52:42.0

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

Latitude of false origin: -82

Longitude of false origin: -14

Latitude of 1st standard parallel -84

Latitude of 2nd standard parallel -80

False easting 2000000

False northing 2000000