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All Journal JURNAL SPASIAL Sumatra Journal of Disaster, Geography and Geography Education
Fajrin, Fajrin
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Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences Education Social Sciences

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Enviromental Monitoring of Land Subsidence in The Coastal Area of Padang City Using Sentinel 1 Sar Dataset Fajrin, Fajrin; Almegi, Almegi; Bakari, Aljunaid; Ramadhan, Risky; Antomi, Yudi
Sumatra Journal of Disaster, Geography and Geography Education Vol 5 No 1 (2021): Sumatra Journal of Disaster, Geography and Geography Education (June Edition)
Publisher : Sumatra Journal of Disaster, Geography and Geography Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (235.748 KB) | DOI: 10.24036/sjdgge.v5i1.359

Abstract

The land surface in the Padang City is thought to be experiencing a continuous relative subsidence due to natural processes and man-made activities. Factors that affect land subsidence include earthquakes, sea level rise, infrastructure development, sediment transport, and excessive use of groundwater sources. The purpose of this research is to map the rate of land subsidence which is processed from the Sentinel 1-A radar, satellite imagery using the Differential Synthetic Aperture Radar (DInSAR) method. The data used are two pairs of Sentinel-1A level 1 Single Looking Complex (SLC) imagery which were acquired in 2018 and 2019. Image processing is carried out by filtering and multilooking techniques on Synthetic Aperture Radar (SAR) images. The following process changes the phase unwrapping to the ground level phase using phase displacement. Land subsidence in 2018–2019 from DInSAR processing reached -10.5 cm / year. The largest land subsidence occurred in North Padang with an average of -7.64 cm/year. Land subsidence in the Padang City, which is located near the estuary, is due to the nature of the alluvial sediment material. The use of Sentinel 1 SAR remote sensing data can provide important information in the context of mitigating land subsidence in the Padang City. Therefore, we need the right policies to handle future land subsidence cases. Land subsidence mapping is one of the factors that determine the vulnerability of coastal areas to disasters
KONSTRUKSI SPASIAL GENANGAN BANJIR MENGGUNAKAN CITRA SATELIT SENTINEL 1 SYNTHETIC APERTURE RADAR (SAR) DI PROPINSI KALIMANTAN SELATAN Fajrin, Fajrin; Armi, Ilham; Antomi, Yudi
Jurnal Spasial Vol 8, No 2 (2021)
Publisher : Program Studi Pendidikan Geografi STKIP PGRI Sumatera Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22202/js.v8i2.4834

Abstract

Banjir merupakan fenomena bencana alam yang frekuensi terus meningkat. Pertumbuhan penduduk yang terus meningkat dan ketidaksempurnaan dalam perencanaan wilayah, seperti kurangnya pertimbangan faktor lingkungan dalam perencanaan. Data spasial distribusi genangan setelah kejadian banjir menjadi sumber data penting dalam evaluasi mitigasi banjir dan analisis bahaya serta penilaian risiko banjir. Dengan meningkatnya ketersediaan data SAR (Synthetic Aperture Radar) temporal dan spasial, memungkinkan untuk melakukan pemetaan wilayah genangan banjir secara cepat. Penelitian ini dilakukan pada salah satu kejadian banjir baru-baru ini yang berdampak luas terjadi di propinsi Kalimantan Selatan menggunakan data SAR Sentinel-1. Prosedur dan prosesing data Sentinel 1 dengan menggunakan ambang batas dari hamburan balik untuk membedakan tubuh air banjir dan bukan banjir. Hasilnya menunjukkan perkiraan luasan genangan banjir dapat di proses dengan cepat, meskipun tertutup awan tebal pada masa masa kejadian banjir yang tidak mungkin dilakukan oleh sensor optik. Hasil pemetaan seperti ini dapat membantu dalam proses layanan darurat dan manjemen resiko bencana banjir
Co-Authors Almegi, Almegi Armi, Ilham Bakari, Aljunaid Ramadhan, Risky Yudi Antomi