Colleagues,
The text below has also gone out to other lists. It is worded to include
those not familiar with SAR Interferometry:-
Research by ERS radar satellite, is imaging surface movement across the
London region. The technique of synthetic aperture radar interferometry
(InSAR), using data from the European Space Agency satellites ERS1 and ERS2
has been used to generate interference fringe images between repeat
satellite orbits to detect surface movement of the London Clay, shrinking
and swelling from summer to winter. Ground survey data coinciding with the
satellite passes in Feb and Oct ’96 is now needed to validate the apparent
changes. The InSAR technique used, is advancing from centimetre accuracy,
towards millimetric surface change detection.
The research is prominent, supported by the British National Space Centre
and the European Space Agency, with partners Thames Water, London
Underground, National Remote Sensing Centre, BGS, BRE, BAe Systems and led
by the University of Nottingham.
A preliminary image is shown here for information (Please email to request
image). The River Thames and roads are overlaid over the satellite image for
location. The research is still in progress. Ground surveys as close as
possible to 22/2/96 and repeated as close as possible to 23/10/96 are
needed anywhere in the image area, but especially in the yellow areas,
ideally within +/-5days of these dates, up to +/- a month. Ideally we seek
surveys of at least 20 survey stations, extending beyond 1km, but any repeat
surveys could be useful. Road/rail surveys may be the most likely, but
without resurfacing between the orbits, because the radar needs to be
reflected from the same surface on both passes.
We have some gps/survey data but not in the date range we are now interested
in. Other summer/winter dates/years are possible if you think you may be
able to assist.
When it comes to publication, the source of any survey data used will be
acknowledged. We are expecting it to be newsworthy at least in London and to
the professional and commercial press in
space/geology/construction/insurance/geodesy. Any survey data donor would
thus get publicity from being associated.
Contact : Dick Stow, Senior Research Officer, School of Chemical
Environmental and Mining Engineering, University of Nottingham. Email
[log in to unmask] Telephone 01484 603986 (anytime).
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