IAG 150 Years pp 427-433 | Cite as

On the Use of Bistatic TanDEM-X Images to Quantify Volumetric Changes of Active Lava Domes

Conference paper
Part of the International Association of Geodesy Symposia book series (IAG SYMPOSIA, volume 143)

Abstract

TanDEM-X is a recent SAR mission, consisting of two almost identical spacecraft flying in close formation. The small distance between the two radar satellites allows two images to be acquired at the same time (bistatic images), strongly reducing the influence of temporal decorrelation, which is one of the major sources of error in repeat-pass interferometric analyses. For the first time, we successfully apply TanDEM-X data to observe topographic changes at active volcanoes by using the image pairs to generate high-resolution digital surface models (DSMs) for each transit of the satellites. Taking the difference between two bistatic DSMs allows us to assess substantial topographic changes and/or sudden ground displacements above the 1 m level. As the first test case, we used bistatic TanDEM-X data to assess topographic change due to the major Merapi 2010 eruption. The preliminary estimated volumetric loss of 19 × 106 m3 is reasonable; however, strong phase noise due to geometrical decorrelation and resulting unwrapping errors affect the result. To demonstrate that much smaller topographic changes are observable with TanDEM-X, we further analyzed data acquired before and after a small explosion at Volcán de Colima in June 2011. The estimated volume loss of 2 × 105 m3 fits well to ground truth data.

Keywords

Double differential DSMs InSAR Lava domes Merapi TanDEM-X Volcán de Colima Volume estimates 

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Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  • Julia Kubanek
    • 1
  • Malte Westerhaus
    • 1
  • Bernhard Heck
    • 1
  1. 1.Geodetic InstituteKarlsruhe Institute of TechnologyKarlsruheGermany

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