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All Journal Spatial : Wahana Komunikasi dan Informasi Geografi Geosfera: Jurnal Penelitian Geografi
Januar, Tri Wandi
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Earth & Planetary Sciences Education Environmental Science Social Sciences

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Klasifikasi Semi-Tak Terbimbing Berbasis Ambang Batas dan Optimisasi Jenks untuk Menganalisis Ekspansi Perkotaan di Kota BSD Menggunakan Data Landsat Multi-Temporal Januar, Tri Wandi; Achmad Muhyidin, Arifai; Juli, Hildayati; Lestari, Filya Rizky; Lestari, Della Ayu
Jurnal Spatial Wahana Komunikasi dan Informasi Geografi Vol. 25 No. 1 (2025): SPATIAL: Wahana Komunikasi dan Informasi Geografi
Publisher : Department Geography Education Faculty of Social Science - Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/spatial.251.003

Abstract

This study analyzes land cover changes in BSD City from 2002 to 2023 using the Semi-Unsupervised Threshold-Based and Jenks Optimization Classification (SUT-JOC) method. Five land cover types were mapped for 2002, 2013, and 2023: built-up area, bare soil, vegetated area, sparsely vegetated area, and water bodies. The results show significant urban expansion from 2002 to 2023, with built-up areas increasing from 2,202 hectares to 4,498 hectares. Land transitions followed a clear pattern, starting from vegetated areas to bare soil, then to built-up land, with spatial development shifting from east to west. Classification accuracy ranged from 88% in 2002 to 96% in 2023, with Kappa values approaching 0.95. The integration of NDVI, MNDWI, and NDBI with rule-based classification reduced manual intervention and improved reliability. These findings highlight the dynamics of peri-urban growth, environmental impacts such as urban heat island effects, and offer insights for sustainable urban planning. SUT-JOC provides a scalable and interpretable framework for multi-temporal urban land monitoring.
Pemetaan Daerah Rawan Erosi di Kecamatan Purwosari, Kabupaten Gunungkidul Berbasis Model USLE Sitaresmi, Deyan Arum; Shofiyani, Virsha; Hutami, Aisahrul; Zahra, Ashila Fitria; Rosadi, Muhamad Imron; Irvi Lestari, Gita Sukma; Januar, Wandi Tri
Geosfera: Jurnal Penelitian Geografi Vol 4, No 2 (2025): Geosfera : Jurnal Penelitian Geografi
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/geojpg.v4i2.35368

Abstract

This study aims to map the erosion hazard levels in Purwosari District, Gunungkidul Regency, Special Region of Yogyakarta, by integrating the Universal Soil Loss Equation (USLE) model with Geographic Information Systems (GIS). The study is motivated by the geomorphological conditions of the karst area, which are inherently susceptible to erosion, coupled with predominant land use in the form of rainfed fields and paddies with minimal vegetation cover. The methodology employs a quantitative descriptive-analytical approach consisting of four main stages: land cover classification, calculation of USLE parameters (R, K, LS, C, and P), spatial overlay to generate the erosion hazard level map, and field validation through observations and interviews with local farmers. The results indicate that approximately 80% of Purwosari District falls within the very low to low erosion hazard categories, while 18.74% is classified as moderate, and the remaining, albeit very small portion, is categorized as high to very high, predominantly in areas with steep slopes and limited vegetation. These findings underscore the need for implementing soil conservation strategies tailored to local characteristics to mitigate the rate of erosion, particularly in highly vulnerable areas. This research is expected to serve as a reference for formulating sustainable land resource management policies in karst regions.
Co-Authors Achmad Muhyidin, Arifai Della Ayu Lestari Hutami, Aisahrul Irvi Lestari, Gita Sukma Juli, Hildayati Lestari, Filya Rizky Rosadi, Muhamad Imron Shofiyani, Virsha Sitaresmi, Deyan Arum Zahra, Ashila Fitria