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Environmental changes resulting from the impact of land use and underwater changes that may occur is the land subsidence. The main idea of this study is to measure and analyse land subsidence in Bandung City by processing SENTINEL 1A satellite images using the PS-InSAR technique. PS-InSAR technique is an effective technique for measuring crustal deformation. We processed 7 pair imageries of SENTINEL 1A images (at level 1.0) acquired from September 2014 to 2017. For time series of interferogram analyse, we analysed 7 pairs possibility of PS-InSAR interferogram using SNAP open source program. To get better result, we computed the best baseline estimation to reduce fringes from baseline between master and slave data. The 1-arcsec (30 m) Shuttle Radar Topography Mission (SRTM) used to remove the topographic contribution as Digital Elevation Model (DEM) reference. Whereas for observing land subsidence using the PS-InSAR method. Overlapping method was used to correlate the effect of changes in land subsidence into land use region in Semarang City. Observations in the deep aquifer used correlation seen from the increase and decrease of the graph of the inner MAT aquifer and the average increase and decrease in ground surface of PS-InSAR. The result of PS- InSAR processing showed the average value of the decrease in the face of the soil with a range of -4.4 ± 3.4 cm up. +2,2 ± 3,4 cm and from result of processing got information of the biggest decrease in land surface is in Sub District Semarang Utara, Semarang Barat, Pedurungan and Genuk. To verify the result of PS-InSAR results, we used secondary data GPS observation[6] in 2013 and 2016 with a 3 observation benchmark points.

Land Subsidence Of Semarang City Using Permanent Scatterer Interferometric Synthetic Aperture Radar (Ps-Insar) Method In Sentinel 1a Between 2014-2017