Analisis Dampak Penurunan Muka Tanah Terhadap Tingkat Ekonomi Menggunakan Kombinasi Metode Dinsar Dan Sig (Studi Kasus : Kota Semarang)

Abstract

Semarang city is the capital city of Central Java Province which is geographically located in 110o16\u2720”- 110o30\u2729” E and 60o55\u2734”- 70o7\u2704” N, and it is about 391,2 km2. Semarang is a city in a coastal area which was formed alluvial sediment. It has it\u27s characteristic process where the land is still through the consolidation process. It causes a land subsidence in those area. Moreover, explorations of land water and the burden of the surface of the land also contribute the land subsidence in Semarang.The purpose of this research is to find out the land subsidence in Semarang by using DInSAR method. DInSAR is a side scan radar technology which uses a phase information, amplitudo, and the wave length to get topography and deformation data. The data which was used in the process is ALOS PALSAR level 1.0 images with the acquisition data in June 2007 (20070608), July 2008 (20080726), and September 2008 (20080910). DInSAR method which was used to process the data was two-pass interferometry with Shuttle Radar Topography (SRTM) as Digital Elevation Model (DEM) to give the topography reference. The DInSAR Process was processed with SARScape software and use a combination of Geographic Information Systems (GIS) for the analysis of economic losses.The result of this research showed the land subsidence in Semarang has got the maximum velocity rate is about 9.059±1.89 cm/year in 20070608-20080910 and it\u27s about 1.979±1.24 cm/year in 20080726-20080910. The area which got the worst impact of the land subsidence is around 69.58 km2 and showed the results in economic losses to the effects of subsidence from the infrastucture sector amounted to idr. 70.983 billion, public facilities idr.16.472 billion, agriculture idr. 1.563 billion and idr. 57.238 billion for settlement