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Combining InSAR, levelling and GNSS for the estimation of 3D surface displacements

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Author: Fuhrmann, T. · Cuenca, M.C. · Knöpfler, A. · Van Leijen, F.J. · Mayer, M. · Westerhaus, M. · Hanssen, R.F. · Heck, B.
Type:article
Date:2015
Publisher: European Space Agency
Source:Ouwehand L., Fringe 2015 Workshop, 23 March 2015 through 27 March 2015, SP-731
series:
European Space Agency, (Special Publication) ESA SP
Identifier: 534549
ISBN: 9789292212957
Keywords: 2015 Observation, Weapon & Protection Systems · RT - Radar Technology · TS - Technical Sciences

Abstract

The three geodetic techniques InSAR, levelling and GNSS are complementary w.r.t. (i) the sensitivity to horizontal and vertical displacement components, (ii) the spatial and temporal resolution of the measurements and (iii) the accuracy of the resulting displacements. We present a strategy to robustly combine the displacement estimates of the three techniques with a focus on long-term, linear movements. The linear displacement rates from InSAR in ascending and descending image geometry are combined with vertical and horizontal rates from levelling and GNSS, respectively, resulting in 3D velocity vectors at a dense surface grid. The results of our combination approach indicate that it is possible to derive realistic surface movements on the sub-mm/a scale with significance.