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:

Ferris, J. (2020). Processed line aeromagnetic data over the Larsen Ice Shelf (1998) (Version 1.0) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/414520DD-26EE-4994-B068-FB4E0F1117B1

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:

The dataset available here includes all channels from raw through to levelled, and microlevelled products. Channel naming follows SCAR/ADMAP2 data release protocols, although the order of processing steps differs from that outlined by ADMAP2 documentation.

Magnetic data channels and processing flow:

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

MagC- Raw magnetic data corrected/cleaned for obvious tip tank events or anomalous spikes.

TCorr- Tiptank corrections (nT). These include DC shifts and gradients due to aircraft noice, etc. Dummy values if not applicable.

RefField- Geomagnetic reference field value for which the magnetic data has been compensated. IGRF model 2000 as implemented in Geosoft (nT).

MagRTC- Compensated magnetic value adjusted for tip tanks and the geomagnetic reference field.

BCorr- Low pass filtered (30 minute) magnetic base station correction.

MagBRTC- calculated as MagBRTC= MagBTC- RefField.

SCorr- Any DC shift applied.

ACorr- MagRT filtered using a low pass filter with a cut-off length of 15 fiducials to account for noise introduced by aircraft roll, pitch and yaw.

MagF- Final mag value before levelling.

MagL- Statistically levelled mag data.

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

Basic channel description:

Line name 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: -64

Longitude of false origin: -70

Latitude of 1st standard parallel -76.4

Latitude of 2nd standard parallel -63.4

False easting 0

False northing 0

Data quality:

Exact date of acquisition is not known. Survey flown in the 97-98 season.

Values of height are incorrect