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Test for applying SAR Interferometry on the Nyiragongo area: preliminary results

Francesco Guglielmino(1) and GIUSEPPE PUGLISI(1)

(1) INGV, PIAZZA ROMA, 2 CATANIA, 95123, Italy

Abstract

The capability of SAR Interferometry to investigate ground deformation in the Nyiragongo area has been tested in this work The test aimed to investigate how the vegetation of Nyiragongo area affects the interferometric phase integrity, between two SAR passes. This point is, indeed, crucial in equatorial areas. The three-pass technique requires subtracting the topographic component from the interferograms used to measure ground deformations. In the absence of external topographic information (e.g. a photogrammetric DEM), the interferometric topographic phases can be provided by processing two SAR images that do not contain deformations. So, from the operational point of view, the test was aimed at verifying the capabilities a) to obtain topographic phases, as continuously as possible on the Earth surface, and b) to produce a ground deformation map, even by using image pairs with a long time interval between passes. The positive results of this test, pushed to carry out other SAR interferometric analysis in this area, aimed at studying the dynamic of recent January 2002 volcanic eruption.

 

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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