Airborne Gravity at the British Antarctic Survey · 2017. 5. 16. · Survey design and data collection: Multiple sensor platform, survey optimised for simultaneous collection of airborne

Airborne Gravity at the British

Antarctic Survey (BAS)

Tom A. Jordan ([email protected])

BAS aerogravity system:

L&R meter S83 in ZLS platform

Survey design and data collection:

Multiple sensor platform, survey optimised for simultaneous collection of airborne gravity, radar, magnetics and LiDAR.

Antarctic surveying: Remote, challenging & unexplored.

Limited facilities Collaboration is key Multi-disciplinary science.

Data processing flow: Things to consider

Raw gravity meter data.

Relative gravity value

Absolute gravity value

Final free air gravity values

free air gravity

Meter parameters (ST rate, K factor, drift rate)

Base tie with land meter

Dynamic and positional corrections from differential GPS

Filtering (space/time domain,

end of line issues)

Editing ‘bad’ data

Gravity data is processed using Geosoft™ software. Gives clear visualisation of data and dynamic linking to maps.

Surveyed regions, historic and recent.

Early surveys of specific geological targets. Focused on the Antarctic Peninsula.

Since 2004: Major collaborations across Antarctica 189,000 line km

Post 2004

Basins, Mountains, Rifts, and the Unknown

Basins: WISE/ISODYN

Jordan et al 2013 RMS error 2.8 mGal

Key UK/Italian collaboration, with additional French support.

Mountains: AGAP

Ferraccioli et al 2011 RMS error 2.97 mGal fro BAS data, 1mGal for US (Sander) data

Rifts: BBAS and Institute/Möllar surveys

Weddell Sea Rift System

West Antarctic Rift System

Ellsworth Whitmore crustal block

Jordan et al 2010, Jordan et al 2013

RMS error 4.3 & 2.8 mGal

UK/US and UK national collaborations

ICEGRAV: Danish, British, Argentine, and Norwegian PolarGAP: Danish, British, Norwegian, with US support

Unknown: ICEGRAV & PolarGAP

https://www.bas.ac.uk/project/polegap/

Future directions?

Combined sensor approach: Platform and strapdown gravity for regional geodetic surveys?

Future directions?

Low cost stand-alone UAV surveys of regions of geological/glaciological interest?

Alternative survey platforms?

A. Olesen

X X

Alternative survey platforms?

http://www.uave.co.uk/

Questions?

Tom A. Jordan ([email protected]) https://www.bas.ac.uk/profile/tomj/