Perancangan Dan Pemanfaatan Trihedral Corner Reflector Sebagai Titik Referensi Deformasi Permukaan Tanah Berbasis Small Baseline-InSAR (Studi Kasus: Kota Surabaya)

Rahmansyah, Ferdian Zaki (2026) Perancangan Dan Pemanfaatan Trihedral Corner Reflector Sebagai Titik Referensi Deformasi Permukaan Tanah Berbasis Small Baseline-InSAR (Studi Kasus: Kota Surabaya). Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penelitian ini merancang dan memanfaatkan Trihedral Corner Reflector (TCR) pasif berbahan aluminium (inner leg 1,5 m) sebagai titik referensi buatan untuk kalibrasi radiometrik dan geometrik citra SAR serta validasi estimasi displacement permukaan tanah berbasis Small Baseline-InSAR (SB-InSAR) menggunakan data Sentinel-1 multitemporal di Kota Surabaya. Kalibrasi radiometrik menghasilkan RCS rata-rata 36,18–36,38 dBsm (deviasi 2,097 dBsm terhadap nilai teoritis, dalam toleransi C-band) dengan stabilitas temporal terkonfirmasi selama 104 hari (p > 0,05), sementara kalibrasi geometrik berhasil pada arah range (RMSE ≤ 0,736 m) namun ditemukan bias azimuth sistematik −27,84 m akibat absennya koreksi ETAD. Uji korelasi SB-InSAR terhadap data CORS ITSN menghasilkan R² = 0,2201 (tanpa TCR) dan R² = 0,1502 (dengan TCR), keduanya tidak signifikan (p > 0,05) akibat keterbatasan sampel dan inkonsistensi deployment portabel. Pola displacement di lokasi studi menunjukkan tren stagnan (−0,742 hingga +0,607 mm), mengindikasikan tidak adanya deformasi vertikal signifikan selama periode pengamatan.
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This study designs and utilizes a passive aluminum Trihedral Corner Reflector (TCR) with a 1.5 m inner leg as an artificial reference target for SAR radiometric and geometric calibration and for validating ground surface displacement estimates derived from Small Baseline InSAR (SB-InSAR) using multitemporal Sentinel-1 data over Surabaya City. Radiometric calibration yielded mean RCS values of 36.18–36.38 dBsm (2.097 dBsm deviation from the theoretical value, within C-band tolerance) with statistically confirmed temporal stability over 104 days (p > 0.05), while geometric calibration achieved sub-pixel accuracy in the range direction (RMSE ≤ 0.736 m) but revealed a systematic azimuth bias of −27.84 m attributed to the absence of ETAD correction. Correlation analysis between SB-InSAR cumulative displacement and CORS ITSN LOS deformation yielded R² = 0.2201 (without TCR) and R² = 0.1502 (with TCR), neither statistically significant (p > 0.05), owing to limited sample size and portable deployment inconsistency. Displacement trends at the study site were largely stagnant (−0.742 to +0.607 mm), indicating no significant vertical deformation during the observation period.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Kata Kunci: Trihedral Corner Reflector, Small Baseline-InSAR, Radar Cross Section, Sentinel-1, Deformasi Tanah. Keywords: Trihedral Corner Reflector, Small Baseline InSAR, Radar Cross Section, Sentinel-1, Ground Deformation.
Subjects:	G Geography. Anthropology. Recreation > G Geography (General) G Geography. Anthropology. Recreation > G Geography (General) > G70.217 Geospatial data G Geography. Anthropology. Recreation > G Geography (General) > G70.5.I4 Remote sensing G Geography. Anthropology. Recreation > GB Physical geography > GB651 Subsidences (Earth movements)
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geomatics Engineering > 29101-(S2) Master Thesis
Depositing User:	Ferdian Zaki Rahmansyah
Date Deposited:	27 Jul 2026 04:10
Last Modified:	27 Jul 2026 04:10
URI:	http://repository.its.ac.id/id/eprint/137649

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