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:

Becker, D., Jordan, T., Robinson, C., & Corr, H. (2021). Processed line aerogravity data from the FISS 2016 surveys covering the Filchner and Halley Ice Shelves, and the English Coast (western Palmer Land), West Antarctica (2016/2017) (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/B3E51C6E-20FD-4E3A-BE47-0ED2EFCAA0AB

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:

Gravity results for the 2016/2017 FISS campaign, taken from the iMAR iNAV-RQH1003 sensor (total: 24 flights).

The IMU/GNSS-strapdown gravity data processing was done by David Becker, Physical and Satellite Geodesy, TU Darmstadt, with a processing software that was developed at this institute.

The cross-over-residuals suggest a data precision (unlevelled) of approx. 1.7 mGal.

No terrestrial gravity ties were available for this campaign, so the determination of the absolute gravity level was difficult:

- For flights F06-F18, the absolute value was determined by a comparison against existing IceBridge gravity data (uncertainty of this levelling and the IceBridge gravity level itself is expected to be around 3 mGal).

- For flights F19-F23 and F25-F29, the absolute value was determined just using the IMU measurements, assuming that the temperature-corrected residual accelerometer biases were the same during the campaign (error of this assumption: approx 3 mGal).

The positions (lat/lon/height) refer to the centre of observations of the iMAR-RQH IMU (the intersection point of its three accelerometers).

The flights are now grouped by survey area (Recover, Slessor, Bailey = FISS).

NOTE there is no Support Force gravity as the sensor was not on-board.

The columns are:

1: Line or flight number

2: Date (YYYY/MM/DD)

3: Time (HH:MM:SS)

4: Latitude in degrees

5: Longitude in degrees

6: Elevation - Ellipsoidal Height (WGS84) in metres

7: Free Air anomaly [mGal] - Gravity disturbance w.r.t. GRS80 normal gravity [mGal]

Data collection:

The data were collected using an iMAR strapdown gravity system.