Land motion in the urban area of Nottingham observed by ENVISAT-1

Leighton, J.M.; Sowter, A.; Tragheim, D.; Bingley, R.M.; Teferle, F.N.. 2013 Land motion in the urban area of Nottingham observed by ENVISAT-1. International Journal of Remote Sensing, 34 (3). 982-1003.

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Persistent scatterer interferometry (PSI) analysis of land motion in the City of Nottingham has been undertaken using advanced synthetic aperture radar (ASAR) data from the ENVISAT-1 satellite covering the period between November 2002 and February 2009, and some interesting areas of motion are evident from the results. The aims of this article are twofold: first to relate these areas to other sources of information such as geology, GPS, and precise levelling, and second to discuss a novel method of atmospheric correction for PSI using precise point positioning (PPP) derived GPS zenith wet delay (ZWD) estimates. PSI validation using the various sources of data is discussed with contextual information regarding historical activity. This article shows that land motion in an urban environment can be widespread and anisotropic, with many different causes, with the consequences that sparse networks of ground-based instruments may be incapable of monitoring land motion in such a complex environment. A ZWD correction method is also presented and results are shown, which improve upon those without the correction. The ZWD estimates are produced using an undifferenced global navigation satellite system (GNSS) processing technique known as PPP. This, coupled with the chosen PSI method, provides a low noise solution when compared to similar experiments involving the integration of GNSS and interferometric synthetic aperture radar (InSAR) data. The results show that there is good temporal and spatial correlation between the PPP ZWD estimates and the PSI-derived atmospheric phase contributions. Noticeable improvements in the PSI solution when comparing before and after processing runs to precise levelling observations are shown.

Item Type: Publication - Article
Digital Object Identifier (DOI):
ISSN: 0143-1161
Date made live: 30 Sep 2013 08:20 +0 (UTC)

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