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m/yr, does not affect the historical center20,21,22. Although the effect of groundwater pumping ended a few decades ago, a reliable and detail knowledge of the land subsidence affecting the historical center is even more important today due to the city Nike Air Jordan 11 Retro Gs Space Jam

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respectively. measurement accuracy). On the average the C band measurements show that about 80 85% of the city displacements range between 0 and 1. 5mm/yr and 15% from 1. 5 to 3mm/yr. a radar reflector must rest on the soil over the entire monitoring period and cannot experienced abrupt movements to be measurable23,24, this long term map can be interpreted as a reliable picture of the natural subsidence that is presently affecting Venice. Figure 2Average displacement rates (mm/yr) obtained by IPTA at Venice: (a) ERS from 1992 to 2002; (b) ENVISAT from 2003 to 2010; (c) TerraSAR X from March 2008 and January 2009; (d) COSMO SkyMed from 2008 to 2011. The Nike Jordan 13 Retro

image background is an aerophotograph acquired in 2009. Negative values indic.

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A large variability (from 4 to 1mm/yr) characterizes the southern coastland (Fig. 1). White triangles show the position of the permanent GPS stations (CGPS). Base map used is a Landsat image obtained from the US Geological Survey Earth Resources Observation and Science (EROS) Center and composed in ESRI ArcMAP 9. 3. Focusing on the historical center of Venice, the displacement pictures of the city over the two consecutive periods covered by C band images are comparable and characterized by a small variability (Fig. 2a and b). The mean subsidence rate and the standard deviation amount to 0. 8 0. 7 and 1.

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0 0. 7mm/yr with ERS and ENVISAT, Nike Air Jordan 6 Retro Black Infrared

vulnerability continuously increased over the years. This work is aimed at distinguishing between natural land subsidence and Air Jordan Black Cat 6 movements induced by anthropogenic activities at Venice using the long and short term displacements of the historical center obtained by PSI on C and X band images, respectively. PSI provides the cumulative land displacements (natural plus anthropogenic) of the investigated area independently of the radar band. the present natural land subsidence, than that averaged over geological periods. Today, the anthropogenic component of the land subsidence is only due to local, short time interventions such as restoration works and inherent deformations of historical structures. Based on these considerations the PSI outcomes are processed to distinguish between the two components of the present land subsidence of Venice. The longest time analysis (C band dataset) are reasonably used for quantifying the natural component and the shortest analysis (X band dataset) for highlighting the anthropogenic displacements. The higher pixel resolution of the X band data enhances the detection of small scale movements. 1992 2002 for ERS and 2003 2010 for ENVISAT, provided a detailed image of land subsidence at the Venice coastland. The results highlight an almost stable (1mm/yr) area encompassing the cities of Treviso, Venice and Chioggia and a zone with significant sinking rates (3 6mm/yr) in the northern coastland.

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