airborne gravity at the british antarctic survey · 2017. 5. 16. · survey design and data...
TRANSCRIPT
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/
