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Utilization of Satellite Imagery for Mapping the Distribution of Seagrass on Buhung Pitue Island Rosalina, Dwi; Arafat, Yasser; Wahda, A Nurtasya; Rombe, Katarina Hesty; Khasanah, Ruly Isfatul; Sofarini, Dini
Indonesian Journal of Geography Vol 56, No 1 (2024): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijg.82259

Buhung Pitue Island has seagrass beds those which are spread almost evenly along its coast. Research using remote sensing technology in an effort to support seagrass conservation in Indonesia needs to be carried out. Spatial data is relatively easy to obtain because there are many types of images with various spatial resolutions. The image can be obtained on google earth. Analysis of the distribution of seagrass areas was obtained by digitizing on screen in ArcGIS software, namely in seagrass areas where the boundaries are known. Digitizing is conducted by enlarging the seagrass area in the downloaded image, performing radiometric and geometric corrections, and digitizing to create a shapefile (shp) storing the location, shape, and attributes of geographic features. The seagrass distribution area of Buhung Pitue Island was of 36.5 Ha in 2014 and was of 39.6 in 2021. The rate of change in area from 2014 to 2021 was of 0.085% (an increase of 3.1 ha). The distribution area of seagrass has increased due to natural factors and restrictions on human activities during the COVID-19 pandemic. In addition, another factor supporting the increase in seagrass distribution is the abundance of Enhalus acoroides seagrass species growing and spreading over long distances. The sea surface temperature was high, which was 30.37 °C, while the current speed was categorized as slow because it was around 0.01 m/s. Although the results are obtained from high-resolution imagery, an accuracy test still needs to be conducted.

Assessing changes in the mangrove ecosystem land area of Tanakeke Island, Takalar Regency, using Landsat 8 imagery Rosalina, Dwi; Rombe, Katarina Hesty; Arafat, Yasser; Jamil, Khairul; Hawati, Hawati; Sabilah, Anisa Aulia; Warni, Warni; Leilani, Ani; Ruzuqi, Rezza; Sari, Suci Puspita; Utami, Eva
Depik Vol 13, No 2 (2024): AUGUST 2024
Publisher : Faculty of Marine and Fisheries, Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/depik.13.2.33697

Rewataya Village is situated on Tanakeke Island, within the Takalar Regency. Despite its significance, previous studies have not addressed the mapping of changes in mangrove land area within this locale. The present research aimed to fill this gap by assessing alterations in mangrove land area from 2013 to 2023, alongside examining density and canopy cover conditions. The method employed for mapping changes in land area entailed utilizing the unsupervised method with maximum likelihood classification. Additionally, the assessment of mangrove conditions involved employing plot line transects to determine species density and hemispherical photography methods to evaluate canopy cover. Notably, two types of mangroves, namely Rhizophora mucronata and Rhizophora apiculata, are prevalent in this village. The mangrove species density in Rewataya Village, Tanakeke Island, is categorized as good. In addition, the canopy cover in Rewataya Village falls within the classification of very dense according to mangrove damage criteria. However, there has been a notable reduction in the mangrove ecosystem area between 2013 and 2023, with a decrease of 42.28 hectares (from 367.13 hectares to 324.84 hectares).Keywords: MangroveLandsat 8Rewataya villageUnsupervised

Assessing changes in the mangrove ecosystem land area of Tanakeke Island, Takalar Regency, using Landsat 8 imagery Rosalina, Dwi; Rombe, Katarina Hesty; Arafat, Yasser; Jamil, Khairul; Hawati, Hawati; Sabilah, Anisa Aulia; Warni, Warni; Leilani, Ani; Ruzuqi, Rezza; Sari, Suci Puspita; Utami, Eva
Depik Vol 13, No 2 (2024): AUGUST 2024
Publisher : Faculty of Marine and Fisheries, Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/depik.13.2.33697

Rewataya Village is situated on Tanakeke Island, within the Takalar Regency. Despite its significance, previous studies have not addressed the mapping of changes in mangrove land area within this locale. The present research aimed to fill this gap by assessing alterations in mangrove land area from 2013 to 2023, alongside examining density and canopy cover conditions. The method employed for mapping changes in land area entailed utilizing the unsupervised method with maximum likelihood classification. Additionally, the assessment of mangrove conditions involved employing plot line transects to determine species density and hemispherical photography methods to evaluate canopy cover. Notably, two types of mangroves, namely Rhizophora mucronata and Rhizophora apiculata, are prevalent in this village. The mangrove species density in Rewataya Village, Tanakeke Island, is categorized as good. In addition, the canopy cover in Rewataya Village falls within the classification of very dense according to mangrove damage criteria. However, there has been a notable reduction in the mangrove ecosystem area between 2013 and 2023, with a decrease of 42.28 hectares (from 367.13 hectares to 324.84 hectares).Keywords: MangroveLandsat 8Rewataya villageUnsupervised

Correlation between Sea Surface Temperature and Rainfall Intensity in Untia Waters, Makassar (2019–2024): Korelasi Suhu Permukaan Laut Terhadap Intensitas Curah Hujan Tahun 2029-2024 di Perairan Untia, Makassar Sabilah, Anisa Aulia; Rombe, Katarina Hesty; Najih, Muhammad Roin; Jamil, Khairul; Rosalina, Dwi; Fatiha, Nurul
Jurnal Ilmiah AgriSains Vol. 26 No. 2 (2025): Jurnal Ilmiah AgriSains
Publisher : Fakultas Peternakan dan Perikanan, Universitas Tadulako, Palu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/jiagrisains.v26i2.2025.79-91

Perairan Untia merupakan salah satu kawasan pesisir di Makassar yang memiliki aktivitas perikanan dan ekonomi yang tinggi. Perubahan pola curah hujan dapat memengaruhi aktivitas perikanan, kualitas air, dan ekosistem lokal. Variasi suhu permukaan laut (SPL) yang disebabkan oleh faktor seperti musim Timur dan musim Barat dapat memengaruhi distribusi dan intensitas curah hujan. Penelitian ini menganalisis data SPL dan intensitas curah hujan selama lima tahun terakhir (2019–2024) di Perairan Untia, Makassar. Data diperoleh dari Stasiun Meteorologi Maritim Makassar. Analisis dilakukan menggunakan uji normalitas, uji korelasi Pearson, dan analisis korelasi silang (cross-correlation) untuk mengetahui keterlambatan waktu (time lag) antara perubahan suhu laut dan terjadinya curah hujan. Hasil uji korelasi menunjukkan SPL memiliki hubungan yang lemah dengan curah hujan di Musim Barat (r = -0.31) dan Musim Peralihan I (r = -0.05), serta hubungan kuat hingga sangat kuat di Musim Timur (r = 0.53) dan Musim Peralihan II (r = 0.77). Hasil analisis cross-correlation memperlihatkan adanya time lag sekitar 1 bulan antara peningkatan SPL dan terjadinya hujan, terutama pada Musim Timur dan Peralihan II. Temuan ini penting untuk mendukung prediksi iklim lokal dan manajemen sumber daya pesisir.

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