Exploitation of Amplitude and Phase of Satellite SAR Images for Landslide Mapping: The Case of Montescaglioso (South Italy)

Remote Sensing

Federico Raspini¹  Andrea Ciampalini¹  Sara Del Conte³  Luca Lombardi¹  Massimiliano Nocentini¹  Giovanni Gigli¹  Alessandro Ferretti³  Nicola Casagli¹  Zhong Lu²  Norman Kerle² 

[1] Earth Sciences Department, University of Firenze, Via La Pira, 4, 50121 Firenze, Italy; E-Mails:Earth Sciences Department, University of Firenze, Via La Pira, 4, 50121 Firenze, Italy;;TRE—Tele-Rilevamento Europa, Ripa di Porta Ticinese, 79, 20143 Milano, Italy; E-Mails:

关键词: SAR interferometry;    speckle tracking;    Montescaglioso;    landslide;    mapping;   

DOI  :  10.3390/rs71114576

来源: mdpi

【 摘 要 】

Pre- event and event landslide deformations have been detected and measured for the landslide that occurred on 3 December 2013 on the south-western slope of the Montescaglioso village (Basilicata Region, southern Italy). In this paper, ground displacements have been mapped through an integrated analysis based on a series of high resolution SAR (Synthetic Aperture Radar) images acquired by the Italian constellation of satellites COSMO-SkyMed. Analysis has been performed by exploiting both phase (through multi-image SAR interferometry) and amplitude information (through speckle tracking techniques) of the satellite images. SAR Interferometry, applied to images taken before the event, revealed a general pre-event movement, in the order of a few mm/yr, in the south-western slope of the Montescaglioso village. Highest pre-event velocities, ranging between 8 and 12 mm/yr, have been recorded in the sector of the slope where the first movement of the landslide took place. Speckle tracking, applied to images acquired before and after the event, allowed the retrieval of the 3D deformation field produced by the landslide. It also showed that ground displacements produced by the landslide have a dominant SSW component, with values exceeding 10 m for large sectors of the landslide area, with local peaks of 20 m in its central and deposit areas. Two minor landslides with a dominant SSE direction, which were detected in the upper parts of the slope, likely also occurred as secondary phenomena as consequence of the SSW movement of the main Montescaglioso landslide.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.