Abstract
Space utilization for measurement of the changes of Earth’s surface is an alternative monitoring technique. Covering a large area with better spatial resolution, comparable accuracy and costly low compared with conventional measurement have made SAR technology more popular in monitoring the subsidence. Land subsidence is the vertical movement of the land surface mainly triggered by fluid extraction, load of construction, geological condition, natural compaction or tectonic activity. Previous researchers have found that Jakarta has experienced land subsidence for decades. On the other hand, rapid urban growth and severe congestion problem in Jakarta are also crucial issues. By providing the first MRT subway, it is expected to be solved the congestion problem. Persistent Scatterer Interferometry Synthetic Aperture Radar (PSInSAR) is one of method to identify the deformation with millimeter accuracy. It was perfectly useful for studied on the land subsidence in consequence of the first MRT subway project in Jakarta. The land displacement monitoring along MRT subway trajectory has been acquired by processing Sentinel 1 and ALOS PALSAR-2. This study was able to investigate the land subsidence by using SARPROZ. Finally, the results of this study indicated that land subsidence occurred in the construction area with the lowest land subsidence rate of -0.6 cm/year and the highest land subsidence rate was -7.3 cm/year.
 Keywords: PSInSAR; subway; land subsidence; MRT.
Highlights
Jakarta as the capital city of Indonesia is a very dense city, populated by 11,063,324 people (Department of Population and Civil Registration Jakarta, 2019)
This paper aims to monitor the displacement on the new subway in Jakarta with approximately length is 6 kilometers through
This research the highlight of Sentinel 1A and ALOS-2 for monitoring the ground subsidence of the first MRT underground excavation, by applied Persistent Scatterer Interferometry Synthetic Aperture Radar (PSInSAR) have been processed with SARPROZ, in a dense city like Jakarta
Summary
Jakarta as the capital city of Indonesia is a very dense city, populated by 11,063,324 people (Department of Population and Civil Registration Jakarta, 2019). Rapid population growth will certainly have impacts on the carrying capacity of settlement areas, including the daily needs of people such as fresh water consumption and transportation. One of the critical issues of increased urban development is land subsidence and its impacts. United States Geological Survey (USGS) defines land subsidence as gradual settling or sudden sinking of the Earth‟s surface due to the removal or displacement of subsurface earth material. Based on data obtained by Department of Industrial and Energy Jakarta, groundwater used in Jakarta is 8,155,282 m3 in 2018 and 6,693,949 m3 until September 2019. South Jakarta consumed 4,348,123 m3 of groundwater in 2018 because it has a lot of high rises buildings and settlement areas. Records indicated vertical movement in Jakarta is vary from 2 cm up to 26 cm in the ECOTROPHIC 14(2):190200 p-ISSN:1907-5626,e-ISSN: 2503-3395
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