Article Per Year (5 Year)
p-Index From 2020 - 2025
0.61
P-Index
This Author published in this journals
All Journal Jurnal Rekayasa elektrika PESARE: Science and Engineering Service Journal Jurnal Geosaintek
Oktarini, Yoessi
Unknown Affiliation
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Public Health

Published : 3 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 3 Documents
Search

 1 
Automating Mining Surface Monitoring using SpatioTemporal Asset Catalog(STAC): A Spectral Index Approach with Sentinel-2 Satellite Imagery Mulkal, Mulkal; Oktarini, Yoessi
Jurnal Rekayasa Elektrika Vol 21, No 3 (2025)
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17529/jre.v21i3.42536

Abstract

Mining activities significantly impact the environment, necessitating effective, continuous monitoring. Traditional surface monitoring methods are often costly and labor-intensive. This study proposes an automated workflow using the SpatioTemporal Asset Catalog (STAC) and Sentinel-2 satellite imagery to monitor mining surface changes. By calculating the Normalized Difference Vegetation Index (NDVI), Normalized Difference Water Index (NDWI), and Modified Bare Soil Index (MBI), the workflow identifies land cover changes within mining concessions. The system was Implemented in Python environment using libraries such as PySTAC, PySTAC Client, Xarray, Rioxarray, Geopandas, Dask, and Numpy. The mining surface change was analyzed using the regression line gradient of each spectral index. Results show active mining sites exhibit an NDVI slope lower than -1, indicating rapid conversion of vegetation to non-vegetative land due to land clearing activities. Conversely, the positive NDWI trend indicates increased water coverage from land excavation, while the MBI trend is the weakest, suggesting limited sensitivity to surface changes in mining areas. To evaluate the accuracy of the results, manual verification was conducted. The analysis revealed that 3 out of 25 mining concessions were incorrectly classified, resulting in an overall accuracy of 88%.
Penguatan Pengetahuan Kesiapsiagaan Terhadap Bahaya Bencana Gempa Bumi dan Tsunami bagi Siswa SMAN I Lhoknga, Kabupaten Aceh Besar Masrurah, Zakia; Sartika, Dewi; Oktarini, Yoessi; Muhni, Akmal
PESARE: Jurnal Pengabdian Sains dan Rekayasa Vol 2, No 2 (2024): Juni 2024
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/pesare.v2i2.38419

Abstract

Earthquakes and tsunamis are natural disasters that can occur anywhere and anytime. Knowledge about the dangers of natural disasters needs to be imparted to the community so that they can understand the types and levels of danger that may arise. This is necessary to enhance the community's capacity to deal with disasters. Reflecting on the occurrence of the 2004 Aceh Earthquake and Tsunami, which claimed hundreds of thousands of lives and caused hundreds of millions of US dollars in losses, increasing knowledge and understanding of disaster hazards needs to be continuously pursued. The repetition of these activities aligns the history of disaster events passed down through generations with the advancements in scientific knowledge and technological progress. Increasing knowledge of earthquake and tsunami hazards can be achieved, in part, through socialization efforts. One appropriate segment of society to receive reinforcement of knowledge through socialization activities is high school students, particularly the students of SMAN 1 Lhoknga, Aceh Besar Regency. Students are the younger generation whose roles can be agents of change within the wider community. Therefore, their role in the realm of disaster management needs to be supported by a good and competent capacity enhancement. Thus, students of SMAN 1 Lhoknga can understand the factors causing and the impacts arising from earthquake and tsunami disasters and actively participate in such events.
ANALISIS KERENTANAN AIRTANAH MENGGUNAKAN METODE GOD BERDASARKAN DATA HIDROGEOLOGI DI KECAMATAN BABAHROT, PROVINSI ACEH Sartika, Dewi Sartika; Ramadhani, Bunga; Rifqan; Muhni, Akmal; Gunarsih, Dina; Rahmatillah, Lia Fitria; Akbar, Muhammad Arief; Hapsari, Tika; Oktarini, Yoessi
Jurnal Geosaintek Vol. 11 No. 3 (2025)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Kecamatan Babahrot mempunyai tata gunalahan yang diperuntukkan sebagai area perkebunan sawit dan pemukiman penduduk. Potensi akan terjadinya pencemaran airtanah sangat memungkinkan dikarenakan penggunaan pupuk pada area perkebunan sawit dilakukan secara terus menerus. Kualitas dan kuantitas airtanah menjadi penting untuk diperhatikan, mengingat airtanah merupakan sumber utama kehidupan makhluk hidup. Studi kerentanan airtanah menggunakan metode GOD (Groundwater Occurrence, Overlaying Lithology and Depth Of Groundwater) berdasarkan data resistivitas dan hidrogeologi memiliki peran yang sangat penting dalam studi pencemaran airtanah. Metode GOD dalam studi kerentanan intrinsik airtanah dilakukan pada 3 jenis parameter meliputi tipe akuifer, tipe akuitar, dan kedalaman muka airtanah. Penggunaan metode GOD dilakukan dengan tujuan untuk dapat memetakan zonasi potensi kerentanan airtanah terhadap pencemaran di lokasi penelitian. Berdasarkan pengamatan dilapangan diperoleh hasil kondisi hidrogeologi di Kecamatan Babahrot memiliki kedalaman muka airtanah sebesar 0,42 hingga 1,58 meter, sedangkan jenis akuifer tergolong kedalam jenis akuifer bebas dan akuifer tertekan dengan litologi terdiri dari pasir, pasir dan kerikil jenuh. Untuk jenis akuitar dilokasi penelitian berdasarkan data resistivitas diperoleh hasil yaitu lempung pasiran, lempung, dan kerikil sedang. Berdasarkan metode GOD yang telah dilakukan, menunjukkan hasil tingkat kerentanan airtanah di lokasi penelitian termasuk kedalam kategori rendah, tinggi, dan sangat tinggi. Dari hasil pengujian geokimia airtanah dilokasi penelitian menunjukkan nilai konsentrasi biochemical oxygen demand (BOD) pada 3 titik sampel airtanah di lokasi penelitian melewati batas ambang dengan batas maksimum sebesar 2 mg/l yaitu pada sumur S-01 sebesar 2,032 mg/l; sumur S-02 sebanyak 2,490 mg/l, dan sumur S-05 sebanyak 2,1951 mg/l.
Co-Authors Akmal Muhni DEWI SARTIKA Hapsari, Tika Masrurah, Zakia Muhammad Arief Akbar Mulkal, Mulkal Rahmatillah, Lia Fitria Ramadhani, Bunga Rifqan Sartika, Dewi Sartika