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All Journal REKAYASA JURNAL ILMIAH GEOMATIKA
Abdul Basith
Teknik Geodesi Universitas Gadjah Mada
Agriculture, Biological Sciences & Forestry Computer Science & IT Earth & Planetary Sciences Electrical & Electronics Engineering Engineering Mathematics Physics

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TANTANGAN DALAM AKUISISI DATA HIDROGRAFI DI ZONA INTERTIDAL UNTUK PEMETAAN LINGKUNGAN PANTAI INDONESIA SKALA 1:10.000 Basith, Abdul
JURNAL ILMIAH GEOMATIKA Vol 20, No 2 (2014)
Publisher : Badan Informasi Geospasial

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (177.77 KB) | DOI: 10.24895/JIG.2014.20-2.160

Abstract

Zona intertidal dan zona tetangganya tempat terjadinya gelombang pecah adalah zona yang menantang untuk melakukan akuisisi data hidrografi yang meliputi garis pantai, DEM pantai dan batimetri. Disebabkan dinamikanya, sering kali daerah ini terancam dari kekosongan data. Untuk penyediaan data sebagai masukan bagi pembuatan Peta Dasar Lingkungan Pantai Indonesia skala 1:10.000, ada beberapa metode yang dapat diusulkan. Untuk pemetaan garis pantai sesaat/garis air dan DEM pada zona intertidal dapat digunakan survei teristris baik menggunakan total station maupun RTK GPS, kamera monitor, LiDAR, water line method, inderaja sensor yang dikombinasikan dengan data pasang surut, DEM maupun pemodelan hidrodinamika. Sementara untuk pengadaan DEM pada zona intertidal dan gelombang pecah dapat menggunakan Jetski Batimetri, USV Batimetri, dan LiDAR.Kata kunci: zona intertidal, akuisisi data hidrografi, LiDAR/USV BatimetriABSTRACTIntertidal and its neighbouring zones where the breaking waves took places are very challenging subjects for hydrography data acquisition such as shoreline mapping, coastal DEM and bathymetry mapping. These areas frequently suffered from null data due to their dynamics. To provide data input for the making of Indonesian Coastal Area Map, scale 1:10.000, we suggest some methods. For shoreline/waterline mapping, the proposed methods are terrestrial surveying (using either total station or RTK GPS), close range photogrammetry, LiDAR, waterline method, remote-sensing sensors combined with tide gauge data, DEM and hydrodynamics model. Furthermore, Jet Ski bathymetry, USV bathymetry, and LIDAR can be used to generate intertidal and break wave zones DEM.Keywords: Intertidal zone, hydrography data aquitition, LiDAR/USV Batimetri
PENGARUH VARIASI MAGNITUD GEMPA TERHADAP WAKTU TEMPUH PENJALARAN GELOMBANG DAN ZONASI DAERAH RAWAN TSUNAMI – STUDI KASUS: KOTA PADANG Oktaviani, Nadya; Basith, Abdul; Kongko, Widjo
GEOMATIKA Vol 20, No 1 (2014)
Publisher : Badan Informasi Geospasial in Partnership with MAPIN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24895/JIG.2014.20-1.29

Abstract

Indonesia merupakan negara yang memiliki wilayah dengan potensi rawan tsunami. Hal ini dikarenakan posisi wilayah Indonesia berada tepat pada pertemuan 3 lempeng besar dunia yang senantiasa selalu bergerak. Sebagai contoh adalah tsunami Aceh 26 Desember 2004 yang merupakan kejadian tsunami terbesar yang pernah terjadi. Dampak dari kejadian tsunami tersebut juga melanda beberapa wilayah lainnya, yakni Srilanka, India, Thailand, dan negara-negara di Afrika Selatan. Oleh karena itu, mitigasi bencana tsunami diperlukan untuk mengurangi dampak dari kejadian bencana tersebut. Kota Padang adalah salah satu wilayah di Indonesia yang memiliki risiko besar terhadap bahaya tsunami. Berdasarkan catatan sejarah, tsunami pernah melanda Kota Padang dengan ketinggian gelombang 5-10 meter pada tahun 1797 dan 1833. Berbagai penelitian dilakukan untuk mensimulasikan prediksi gempa yang disertai tsunami tersebut. Salah satunya menggunakan model numerik tsunami yakni TUNAMI N3. Pemodelan menggunakan model numerik dinilai lebih dinamis dan pemodelan dapat disesuaikan dengan nilai keluaran yang diharapkan sesuai dengan data masukan yang disiapkan. Dari hasil pemodelan numerik tsunami dapat diketahui kaitan antara magnitud gempa dan waktu tempuh penjalaran gelombang tsunami mencapai daratan. Parameter ini sangat penting diketahui untuk tujuan mitigasi bencana.Kata kunci: gempa, waktu tempuh penjalaran gelombang tsunami, landaan, TUNAMI N3ABSTRACT     Indonesia is vulnerable to tsunami. This is caused by location of Indonesia that located on the three major plates that always moving constantly. For example the tsunami in Aceh on December 26, 2004 is the largest tsunami events. The impact of the tsunami that also hit several other regions, namely Sri Lanka, India, Thailand, and other countries in South Africa. Therefore, the tsunami disaster mitigation is required to reduce the impact of the disaster event. Padang city is one of the regions in Indonesia which has a higher risk of tsunami hazard. Based on historical records, the tsunami had hit the city of Padang with a wave height of 5-10 meters in 1797 and 1833. Various studies conduct to simulate earthquake and prediction of tsunami. One of them using the tsunami numerical method is TUNAMI N3. Model using numerical method is considered  dynamic in modeling. From the results of numerical modeling of tsunami can be known relation between the magnitude of the earthquake and travel time wave propagation tsunami. This parameter is very important to know for the purpose of disaster mitigation.Keyword: earthquake, tsunami, inundation, TUNAMI N3
TANTANGAN DALAM AKUISISI DATA HIDROGRAFI DI ZONA INTERTIDAL UNTUK PEMETAAN LINGKUNGAN PANTAI INDONESIA SKALA 1:10.000 Basith, Abdul
GEOMATIKA Vol 20, No 2 (2014)
Publisher : Badan Informasi Geospasial in Partnership with MAPIN

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (669.409 KB)

Abstract

Zona intertidal dan zona tetangganya tempat terjadinya gelombang pecah adalah zona yang menantang untuk melakukan akuisisi data hidrografi yang meliputi garis pantai, DEM pantai dan batimetri. Disebabkan dinamikanya, sering kali daerah ini terancam dari kekosongan data. Untuk penyediaan data sebagai masukan bagi pembuatan Peta Dasar Lingkungan Pantai Indonesia skala 1:10.000, ada beberapa metode yang dapat diusulkan. Untuk pemetaan garis pantai sesaat/garis air dan DEM pada zona intertidal dapat digunakan survei teristris baik menggunakan total station maupun RTK GPS, kamera monitor, LiDAR, water line method, inderaja sensor yang dikombinasikan dengan data pasang surut, DEM maupun pemodelan hidrodinamika. Sementara untuk pengadaan DEM pada zona intertidal dan gelombang pecah dapat menggunakan Jetski Batimetri, USV Batimetri, dan LiDAR.Kata kunci: zona intertidal, akuisisi data hidrografi, LiDAR/USV Batimetri
The Effect of Sunglint Correction for Estimating Water Depth Using Rationing, Thresholding, and Mean Value Algorithms Prayogo, Luhur Moekti; Basith, Abdul
Rekayasa Vol 14, No 1: April 2021
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v14i1.8698

Abstract

Satellite-Derived Bathymetry (SDB) is an alternative for obtaining shallow water depth data. The existence of images with various resolutions, the availability of a complete image band can develop the extraction results. This method is based on the principle of the satellite's visible band to estimate water depth. The mapping of shallow water depth is dependent on water conditions, both its brightness and surface. When the sensor senses a water object, the reflected reflection comes from the surface, and some sensors cannot penetrate the water object. The sun's position and the sensor's point of view when sensing it results in interference from the water surface (Sunglint). The sunglint effect on the image can be reduced by performing RGB band correction with NIR Infrared. This study aims to demonstrate the effect of Sunglint's correction on three SDB approaches, namely Thresholding, Rationing, and Mean Value on Worldview 3 imagery in Karimunjawa Islands, Central Java. This study's results indicate that the Sunglint correction on Worldview 3 imagery affects the depth extraction results. The best results are shown by Sunglint's correction using the Thresholding approach (B2-B7), which produces the best correlation with R2 of 0.7364 and (B7-B2) with R2 = 0.7351. Contrastingly, the lowest correlation was generated using the Mean Value ((B2 + B7) / 2) approach without Sunglint's correction with R2 = 0.4015. So this research proves that the Worldview 3 image with Sunglint correction can provide bathymetry data, especially in shallow waters.
Perbandingan Metode Roberts’ Filter, Segmentasi dan Band Ratio Pada Citra Landsat 8 untuk Analisis Garis Pantai Prayogo, Luhur Moekti; Basith, Abdul
Rekayasa Vol 14, No 3: Desember 2021
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v14i3.10300

Abstract

Computerization has an essential role in the field of remote sensing. Various methods for automatic coastline analysis continue to develop. This study aims to determine the performance of three methods, namely Roberts' Filter, Segmentation, and Band Ratio on Landsat 8 imagery, in producing land edges that are directly adjacent to the sea area (coastline). This study shows that the non-fusion image, the resulting edge, is less sharp than the fused image in the Roberts' filter method. The use of a 2x2 matrix on the Roberts' filter, the range of values from 0.52 to 0.56 in the segmentation method, and the Green Band Ratio - Near-Infrared produce various accuracy. The best method is produced by Band Ratio, where the edge detection results are close to the image's actual conditions. Meanwhile, unsatisfactory results are produced by the segmentation method.
Co-Authors Hari Rusdwi Novitasiah Lia Hapsari Luhur Moekti Prayogo Oktaviani, Nadya Widjo Kongko, Widjo