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FRINGE '96 Workshop: ERS SAR Interferometry, 30 September - 2 October 1996
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FRINGE 96

On the accuracy of differential SAR interferometry over Mt Etna

J.-P. Muller, M. Upton, J. G. Morley University College London, Gower Street, London. WC1E 6BT, U.K.

G. Wadge, N. Stevens NERC-ESSC, Reading

J.B. Murray Open University

Abstract


The NERC project on "Volcano monitoring using SAR interferometry" led by Prof. Geoff Wadge (Reading, NERC-ESSC) is concerned with the quantitative evaluation of the accuracy of differential interferometry for volcano monitoring using ERS data.
The UCL 3D Image Maker System for differential SAR interferometry (described by Upton, Muller, Smith; this workshop) has been employed to produce a variety of differential interferograms using the 2-pass + DEM method pioneered by Massonnett and co-workers.
Firstly the ERS-1 pairs analysed by Massonnet have been subject to an independent assessment using precision state vectors obtained from the D-PAF. Three different DEMs have been employed in the 2-pasds method to assess the impact of DEM accuracy on any possible artifacts which may appear in the differential interferogram. A 10m DEM grid-point interpolated from 1:10 000 10m contours kindly provided by CNR together with a SPOT-DEM generated using a specially commissioned overpass in August 1995 together with the 100m EURODEM (derived from FDTYED level 1) have all been used. Results will be presented of the impact of these DEMs on the differential interferogram at the Workshop.
Keywords:

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry