Pemetaan Permeabilitas Magnetik Permukaan Berbasis Citra Sar Polarimetrik Dengan Pengukuran in Situ Di Lapangan Gunung Api

Saepuloh, Asep; Army, Edo Kharisma; Hilman, Zaki

doi:10.14203/risetgeotam2020.v30.1080

Cited by 4 publications

(6 citation statements)

References 11 publications

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“…The mSTA works based on the STA principle [17]. The STA principle detects lines from pixels that are read as vector elements by examining local variations in the gray level of digital numbers [18]. The program used for the linear features extraction is developed using MATLAB syntax.…”

Section: Lineament Extractionmentioning

confidence: 99%

“…kmin is also defined to minimize εj that represents the difference between the values at the central pixel in the window. Since the image may produce more than one kmin due to remaining speckle noises [18] average the three neighbouring εj values in the window as:…”

Section: Lineament Extractionmentioning

confidence: 99%

“…Modified Segment Tracing Algorithm (mSTA) was used to extract the linear feature, which was interpreted as fault or fractured based on Sentinel-1A data with Ascending and Descending modes. The improvement of mSTA was achieved by excluding short lineaments of mSTA, which originated from speckle noises in the black slope of LOS with low backscattering intensities [18]. The mSTA data is gained by combining two orbit mode lineaments, grouping them, and eliminating short lineaments.…”

Section: Landslide Distribution and Identificationmentioning

confidence: 99%

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Application of modified Segment Tracing Algorithm (mSTA) Method to Identify Landslide Susceptibility Zones Around Mt. Sinabung, Indonesia

Zahratunnisa,

Saepuloh,

Kriswati

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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Lineament could present the fractured zones and increase the landslides occurrence probabilities. This study aims to assess landslides susceptibility zones based on recorded landslide events corresponded to the detected lineaments around Mt. Sinabung, Indonesia. In this study, we use Synthetic Aperture Radar (SAR) data to increase the extraction accuracy of fracture-related lineament at Mt. Sinabung. The lineament densities were calculated to identify the landslide susceptibility zones including frequency, length, and intersection using modified Segment Tracing Algorithm (mSTA) method for area about 10.9 × 9 km. Based on visual observations and technical report, a total of 61 landslides were occurred around Mt. Sinabung from 2016, 2018, and 2021. An Ordinary Kriging density map of the lineament frequency using 800 × 800 m cells showed agreement between the lineament density and landslide distribution. Comparing landslide location and lineament density, landslide occurrences were located mainly at high and moderate lineament densities. We have classified the landslide density for three years into low, moderate, and high based on histogram quartile analyses. This classification could be used to mitigate the landslide hazard in a large area.

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Section: Lineament Extractionmentioning

confidence: 99%

Section: Lineament Extractionmentioning

confidence: 99%

Section: Landslide Distribution and Identificationmentioning

confidence: 99%

See 1 more Smart Citation

Application of modified Segment Tracing Algorithm (mSTA) Method to Identify Landslide Susceptibility Zones Around Mt. Sinabung, Indonesia

Zahratunnisa,

Saepuloh,

Kriswati

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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“…The ascending orbit indicates that the satellite moves from South to North with looking direction to East. Meanwhile, the descending orbit indicates that the satellite moves from North to South by looking directly to the West based on Saepuloh et al [3]. Detail about data acquisition is listed in Table 1.…”

Section: Data Collection and Specificationmentioning

confidence: 99%

Optimizing Image Scale and Resolution to Obtain Lineament Related Structures using ALOS PALSAR Dual Orbit Data

Akrom

Saepuloh

2022

IOP Conf. Ser.: Earth Environ. Sci.

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Geological structures identification using conventional optical remote sensing encountered some problems due to atmospheric and surface conditions. Therefore, we exploited the Synthetic Aperture Radar (SAR) in Ascending and Descending orbits to characterize lineaments related to geological structures. We have analyzed two images from the Phased Array type L-band Synthetic Aperture Radar (PALSAR) onboard the Advanced Land Observing Satellite (ALOS). The adjustment of their resolution in the multilooking process was applied to obtain the best understanding between detected lineament and reference fault. The cross-polarized data of ALOS PALSAR level SLC were multilooked with variation of resolution from 15 to 120 m. Obtaining the optimum detected lineament-related faults, which applied the Yamaguchi criterion to extract the lineament visually in the multilooked images. The Kamojang-Guntur Geothermal Fields in West Java were selected as a study area because there is a challenge to confirm geological structure in the area with high alteration and high weathering conditions. According to the proposed criterion, we have obtained those images with resolution of 75 to 90 from the analysis images can represent surface geological structure conditions, and the correlation with existing published geological map. The field verifications have been confirmed that the geological structure indication from images has been proved with the existence of slickenside and morphological conditions such as drainage of rivers, ridges, and valleys. Based on lineaments, stress regimes, and field verifications, it was concluded that Yamaguchi criterion analysis with image resolution 75 to 90 m can describe the presence of regional structures and interpreted structures.

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“…DOI: 10.5614/bull.geol.2022.6.3.1 untuk mengestimasi nilai reflektivitas objek permukaan seperti nilai magnetic permeability dan dielectric permittivity. Sedangkan polarisasi silang (HV) memiliki kemampuan pembedaan objek permukaan secara geometri seperti kekasaran permukaan (Saepuloh, 2019).…”

Section: Data Dan Metodologiunclassified

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2022

bull.geol.

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Sari -Berkembangnya teknologi-teknologi di bidang eksplorasi mineral logam, menjadikan kegiatan eksplorasi menjadi lebih efektif dan efisien, salah satunya adalah dengan adanya teknologi penginderaan jauh aktif. Teknologi ini bisa memudahkan proses analisis potensi mineral suatu daerah dalam waktu yang singkat dengan cakupan area yang luas. ALOS PALSAR (Advance Land Observing Satellite Phased Array Type L-Band Synthetic Aperture Radar) merupakan citra satelit dengan sensor aktif yang mampu mengeluarkan saluran-L dengan panjang gelombang 23.6 cm. Kemampuan saluran-L yang mampu menembus tutupan kanopi vegetasi sangat bermanfaat untuk menganalisis permukaan bumi yang berkaitan dengan karakteristik fisis di permukaan terutama yang berkaitan dengan kemagnetan dan kelistrikan. Penelitian ini dilakukan dengan menggunakan citra ALOS PALSAR 1.1 FBD ascending dengan area liputan meliputi Desa Bantar Karet, Ciguha dan Malasari, Kecamatan Nanggung, Kabupaten Bogor. Pada penelitian ini digunakan dua tipe data yaitu data pengamatan langsung lapangan dan data pengamatan citra. Pada pengamatan citra dilakukan beberapa tahapan yaitu pemilihan citra, koreksi citra, pemodelan 2D, dan analisis citra komposit berdasarkan hasil pengamatan lapangan dalam pemodelan 2D. Setelah dilakukan koreksi radiometrik dan geometrik serta proses multilooking, kemudian dilanjutkan dengan proses analisis nilai hamburan balik hasil interaksi material di permukaan bumi dengan gelombang elektromagnetik yang berasal dari satelit ALOS PALSAR dengan metode mdPSAR (magnetic dielectric from Polarimetric Synthetic Aperture Radar). Analisis ini bertujuan untuk memetakan model 2D magnetic permeability dan dielectric permittivity, dari tubuh vein, litologi dan alterasi dari sistem mineralisasi epithermal low sulphidation system. Dari hasil penelitian didapatkan tubuh vein berada pada nilai dielectric permittivity tinggi yang diapit nilai dielectric permittivity rendah dan magnetic permeability rendah yang berpola Barat Laut-Tenggara mengikuti arah mineralisasi Pongkor. Zona alterasi berada pada nilai kekasaran permukaan yang rendah dengan nilai magnetic permeability tinggi. Lava andesit berada pada nilai tinggi untuk parameter kekasaran permukaan, magnetic permeability, dan dielectric permittivity. Sedangkan batuan vulkanik seperti tuf, lapili tuf, dan breksi tuf berada pada kekasaran permukaan tinggi dengan magnetic permeability dan dielectric permittivity yang rendah.

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Pemetaan Permeabilitas Magnetik Permukaan Berbasis Citra Sar Polarimetrik Dengan Pengukuran in Situ Di Lapangan Gunung Api

Cited by 4 publications

References 11 publications

Application of modified Segment Tracing Algorithm (mSTA) Method to Identify Landslide Susceptibility Zones Around Mt. Sinabung, Indonesia

Application of modified Segment Tracing Algorithm (mSTA) Method to Identify Landslide Susceptibility Zones Around Mt. Sinabung, Indonesia

Optimizing Image Scale and Resolution to Obtain Lineament Related Structures using ALOS PALSAR Dual Orbit Data

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