The Latest DTM Using INSAR for Dynamics Detection of Semangko Fault-Indonesia
Penulis/Author
Atriyon Julzarika (1); Prof. Ir. Trias Aditya K.M., S.T., M.Sc., Ph.D., IPU., ASEAN Eng. (2); Ir. Subaryono, M.A., Ph.D. (3); Prof. Dr. Ir. Harintaka, S.T., MT., IPU. ASEAN Eng. (4)
Tanggal/Date
17 2021
Kata Kunci/Keyword
Abstrak/Abstract
The latest Digital Terrain Model (DTM) is seen as an upgradable DTM that is fitted to the latest combination
of DTM master and its displacement. The latest DTM can be used to overcome the problem of static DTM weaknesses
in displaying the latest topographic changes. DTM masters are obtained from InSAR and Digital Surface Model (DSM)
ALOS PALSAR conversions. Meanwhile, the displacement is obtained from Sentinel-1 images, which can be updated every
6–12 days or at least every month. ALOS PALSAR data were the images acquired in 2008 and 2017, while Sentinel-1 data
used were images acquired in 2018 and 2020. This study aims to reveal the importance of an upgradable DTM so called
latest DTM which is combination of DTM master and its displacement in order to show the latest condition of study area.
The case study is the dynamics analyze of the Semangko fault specifically in the Sianok and Sumani segments situated in
Indonesia. The vertical accuracy assessment was done to evaluate the DSM to DTM conversion with a tolerance of 1.96σ.
The result obtained is the latest DTM. It is derived from the integration of the DTM master with displacement. The latest
DTM can be used to detect the dynamics of Semangko fault. The study area has vertical deformation at a value of –50 cm
to 30 cm. The Semangko fault area is dominated by –25 to 5 cm deformation. In general, this region has decreased. The
decline in this region ranges from 7.5 cm to 10 cm per year. The latest DTM vertical accuracy is 2.158 m (95% confidence
level) with a scale of 1: 10,000 to 1: 20,000.
