The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
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Articles | Volume XL-1/W5
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XL-1/W5, 737–743, 2015
https://doi.org/10.5194/isprsarchives-XL-1-W5-737-2015
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XL-1/W5, 737–743, 2015
https://doi.org/10.5194/isprsarchives-XL-1-W5-737-2015

  11 Dec 2015

11 Dec 2015

APPLICATIONS OF MEDIUM C-BAND AND HIGH RESOLUTION X-BAND MULTITEMPORAL INTERFEROMETRY IN LANDSLIDE INVESTIGATIONS

J. Wasowski1, F. Bovenga2, R. Nutricato3, D. O. Nitti3, and M. T. Chiaradia4 J. Wasowski et al.
  • 1CNR-IRPI, National Research Council, 70126 Bari, Italy
  • 2CNR-ISSIA, National Research Council, 70126 Bari, Italy
  • 3GAP srl, c/o Politecnico di Bari, 70126 Bari, Italy
  • 4Dipartimento Interateneo di Fisica, Politecnico di Bari, 70126 Bari, Italy

Keywords: COSMO-SkyMed, ENVISAT, ERS, Multi-Temporal Interferometry, Landslide

Abstract. With the increasing quantity and quality of the imagery available from a growing number of SAR satellites and the improved processing algorithms, multi-temporal interferometry (MTI) is expected to be commonly applied in landslide studies. MTI can now provide long-term (years), regular (weekly-monthly), precise (mm) measurements of ground displacements over large areas (thousands of km2), at medium (~20 m) to high (up to 1-3 m) spatial resolutions, combined with the possibility of multi-scale (regional to local) investigations, using the same series of radar images. We focus on the benefits as well as challenges of multisensor and multi-scale investigations by discussing MTI results regarding two landslide prone regions with distinctly different topographic, climatic and vegetation conditions (mountains in Central Albania and Southern Gansu, China), for which C-band (ERS or ENVISAT) and X-band COSMO-SkyMed (CSK) imagery was available (all in Stripmap descending mode). In both cases X-band MTI outperformed C-band MTI by providing more valuable information for the regional to local scale detection of slope deformations and landslide hazard assessment. This is related to the better spatial-temporal resolutions and more suitable incidence angles (40°-30° versus 23°) of CSK data While the use of medium resolution imagery may be appropriate and more cost-effective in reconnaissance or regional scale investigations, high resolution data could be preferentially exploited when focusing on urbanized landslides or potentially unstable slopes in urban/peri-urban areas, and slopes traversed by lifelines and other engineering structures.