Getech Global Gravity and Magnetic DataEntry ID: GETECH_GLOBAL_GRAVITY
Abstract: GETECH is a leading world authority on generating free-air gravity from
satellite altimeter data. R&D over the past ten years has yielded technology to
provide th4e most accurate and consistent satellite gravity available.
They are currently re-processing altimeter data from the GEOSAT and ERS-1
satellites on behalf of a four-company industry consortium of leading oil
companies to generate a ... Global Continental Margins gravity dataset.
Satellite gravity relies on the fact that changes in sea surface height are
related to the existence of local gravity anomalies. Satellite based radar
altimeters offer the opportunity to measure the sea surface height to a
precision of a few centimetres. Gravity anomalies are then created from the
altimetry data using FFT techniques.
Regional tectonic analysis
GETECH has carried out exhaustive editing, processing and levelling of
satellite altimeter data from the Geodetic Missions of the ERS-1 and GEOSAT
satellites to provide an 'Enhanced' satellite gravity data product.
All these data are available for license now as Digital 2' (~4km) grids of
free-air gravity, bathymetry, Bouguer anomaly and isostatic residual gravity.
'Ultimate Resolution' satellite gravity
This advanced processing technique is currently being applied to generate the '
Global Continental Margins' gravity dataset on behalf of a four-company
The advanced technique includes proprietary waveform matching algorithm to
're-pick' the first breaks of the ERS-1 satellite altimeter waveforms.
Some recent publications describe the technology and processes being applied:
-Satellite-derived gravity having an impact on marine exploration, J Derek
Fairhead, Christopher M Green and Mark E Odegard, Leading Edge, SEG, August
-Oil Exploration from space; fewer spaces to hide, J Derek Fairhead,
Christopher M Green and William Dickson. First Break, EAGE, September 2001
Data from this study can only be released to non-sponsors of the study over the
Greater Gulf of Mexico region.
[Summary provided by Getech.]
(Click for Interactive Map)
OCEANS > COASTAL PROCESSES > SEA SURFACE HEIGHT
SOLID EARTH > GRAVITY/GRAVITATIONAL FIELD > CONTROL SURVEYS
SOLID EARTH > GRAVITY/GRAVITATIONAL FIELD > GRAVITY
SOLID EARTH > GRAVITY/GRAVITATIONAL FIELD > SATELLITE ORBITS/REVOLUTION
SOLID EARTH > GRAVITY/GRAVITATIONAL FIELD
SOLID EARTH > GEOMAGNETISM > MAGNETIC FIELD
OCEANS > BATHYMETRY/SEAFLOOR TOPOGRAPHY > BATHYMETRY
SOLID EARTH > TECTONICS > PLATE TECTONICS
Quality GETECH believe that the information provided on this website is accurate,
however, we do not make any representation, implied or otherwise as to the
accuracy or completeness of this information. Whilst we will endeavour to keep
the information up-to-date, there may still be inaccuracies or typographical
errors. Changes are periodically made to the information.
Data Set Progress
Role: DIF AUTHOR
Phone: (301) 614-6898
Email: Tyler.B.Stevens at nasa.gov
NASA Goddard Space Flight Center Global Change Master Directory
Province or State: MD
Postal Code: 20771
Role: TECHNICAL CONTACT
Email: jdf at getech.com
GETECH University of Leeds Leeds LS2 9JT UK
Creation and Review Dates
DIF Creation Date: 2004-02-02
Last DIF Revision Date: 2004-02-02