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Intermittent Small Baseline Subset (ISBAS) monitoring of land covers unfavourable for conventional C-band InSAR: proof-of-concept for peatland environments in North Wales, UK

Cigna, Francesca; Sowter, Andrew; Jordan, Colm J.; Rawlins, Barry G.. 2014 Intermittent Small Baseline Subset (ISBAS) monitoring of land covers unfavourable for conventional C-band InSAR: proof-of-concept for peatland environments in North Wales, UK. In: SPIE Proceedings : SAR Image Analysis, Modeling, and Techniques XIV (2014), Amsterdam, Netherlands, 22 Sept 2014. SPIE, 924305.

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Abstract/Summary

This paper provides a proof-of-concept for the use of the new Intermittent Small Baseline Subset (ISBAS) approach to study ground elevation changes in areas of peat and organic soils in north Wales, which are generally, unfavourable for conventional C-band interferometric applications. A stack of 53 ERS-1/2 C-band SAR scenes acquired between 1993 and 2000 in descending mode was processed with both the standard low-pass SBAS method and ISBAS. The latter revealed exceptional improvements in the coverage of ground motion solutions with respect to the standard approach. The number of identified coherent and intermittently coherent pixels increased by a factor of 26 with respect to the SBAS solution, and extended the coverage of results across unfavourable land covers, particularly for coniferous woodland, bog, acid grassland and heather. The greatest increase was achieved over coniferous woodland, which showed ISBAS/SBAS pixel density ratios above 300. Despite the intermittent nature of the ISBAS solutions, ISBAS provided velocity standard errors generally below 1-1.5 mm/yr, thus preserving good quality of the estimated ground motion rates.

Item Type: Publication - Conference Item (Paper)
Digital Object Identifier (DOI): 10.1117/12.2067604
ISSN: 0277786X
Date made live: 18 Mar 2015 11:29 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/510200

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