Analisis Perubahan Garis Pantai Tahunan Berbasis Citra Sentinel-2 Multitemporal Di Pulau Gili Ketapang

Mindava, Raditya Farhan Mindava Aziz (2026) Analisis Perubahan Garis Pantai Tahunan Berbasis Citra Sentinel-2 Multitemporal Di Pulau Gili Ketapang. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pulau Gili Ketapang merupakan pulau kecil di utara Kabupaten Probolinggo yang memiliki dinamika perubahan garis pantai cukup tinggi akibat proses abrasi dan akresi. Penelitian ini bertujuan mengekstraksi garis pantai, menganalisis perubahannya secara spasial dan temporal, serta mengevaluasi akurasi hasil ekstraksi di Pulau Gili Ketapang periode 2020–2025. Ekstraksi garis pantai dilakukan menggunakan metode Normalized Difference Water Index (NDWI) dengan nilai threshold 0 terhadap enam citra Sentinel-2 Level-2A. Pemilihan tanggal akuisisi citra didasarkan pada analisis pasang surut dengan metode Least Square terhadap data prediksi BIG Stasiun Probolinggo, yang menghasilkan nilai bilangan Formzahl sebesar 1,1491 (tipe campuran condong harian ganda) dan enam tanggal terpilih dengan elevasi rata-rata 76,2 cm. Garis pantai yang dihasilkan pada setiap tahun merupakan kondisi sesaat yang diwakili oleh satu citra terpilih, sehingga mencerminkan posisi garis pantai pada tanggal perekaman tertentu dan bukan merupakan rata-rata kondisi sepanjang tahun. Analisis perubahan garis pantai dilakukan menggunakan Digital Shoreline Analysis System (DSAS) dengan parameter Net Shoreline Movement (NSM), End Point Rate (EPR), dan Shoreline Change Envelope (SCE), sedangkan validasi dilakukan menggunakan 548 titik pengukuran GNSS RTK dengan garis pantai referensi hasil Canny Edge Detection. Hasil analisis terhadap 102 transek valid menunjukkan dominasi abrasi sebesar 57,8% dengan nilai rata-rata NSM −4,265 m, EPR −0,859 m/tahun, dan SCE 13,100 m. Abrasi paling signifikan terkonsentrasi di ujung barat dan sisi selatan pulau, sementara akresi teridentifikasi di sisi timur dan sebagian sisi utara. Validasi menghasilkan nilai RMSE Layer Basah sebesar 7,708 m, yang berada di bawah ambang batas 10 m sehingga hasil ekstraksi dinyatakan valid.
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Gili Ketapang Island is a small island located in the northern part of Probolinggo Regency with highly dynamic shoreline changes driven by abrasion and accretion processes. This study aims to extract shorelines, analyze their spatial and temporal changes, and evaluate the accuracy of the extraction results in Gili Ketapang Island for the period 2020–2025. Shoreline extraction was performed using the Normalized Difference Water Index (NDWI) method with a threshold value of 0 applied to six Sentinel-2 Level-2A images. Image acquisition dates were determined based on tidal analysis using the Least Square method applied to tidal prediction data from BIG Probolinggo Station, yielding a Formzahl number of 1.1491 (mixed tide prevailing semidiurnal type) and six selected dates with a mean tidal elevation of 76.2 cm. The shoreline extracted for each year represents an instantaneous condition captured by a single selected image, thus reflecting the shoreline position at a specific acquisition date rather than an average condition throughout the year. Shoreline change analysis was conducted using the Digital Shoreline Analysis System (DSAS) with Net Shoreline Movement (NSM), End Point Rate (EPR), and Shoreline Change Envelope (SCE) parameters, while validation was performed using 548 GNSS RTK measurement points against a reference shoreline derived from Canny Edge Detection. Analysis of 102 valid transects revealed a dominance of abrasion at 57.8%, with mean values of NSM −4.265 m, EPR −0.859 m/year, and SCE 13.100 m. The most significant abrasion was concentrated at the western tip and southern side of the island, while accretion was identified on the eastern side and parts of the northern side. Validation yielded an RMSE value of 7.708 m for the Wet Layer, which is below the 10 m threshold, indicating that the extraction results are valid.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Garis Pantai, Sentinel-2, NDWI, DSAS, GNSS RTK, Pulau Gili Ketapang, Shoreline, Sentinel-2, NDWI, DSAS, GNSS RTK, Gili Ketapang Island
Subjects:	G Geography. Anthropology. Recreation > GC Oceanography
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geomatics Engineering > 29202-(S1) Undergraduate Thesis
Depositing User:	Raditya Farhan Mindava Aziz
Date Deposited:	23 Jul 2026 07:17
Last Modified:	23 Jul 2026 07:17
URI:	http://repository.its.ac.id/id/eprint/136455

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