Bondan Galih Dewanto | Danang Sri Hadmoko | Nurul Fitrah Ramadhani | Admiral Musa Julius

Remote Sensing Applications: Society and Environment Volume 38, April 2025, 101555

Abstract

Throughout history, Ternate, a diminutive volcanic island located in the North Maluku Province of Indonesia, has functioned as a significant center of the nation’s social and economic activity. The Gamalama Volcano constituted a significant element of Ternate Island’s topography, and its eruption resulted in substantial disruption. The aims of this current contribution are: to monitor the historical activities of the Gamalama volcano and understanding the geothermal potential to support the energy needs in Ternate Island. The multi-temporal analysis was conducted to monitor the activity of Gamalama Volcano, utilizing satellite imagery spanning a period of 50 years. The imagery sources included Landsat 1, Landsat 4, Landsat 5, Landsat 7, ASTER, and Landsat 8. The present study employed the single-channel algorithm to derive the land surface temperature (LST). The band combination and ratio were utilized to infer the geological context and geothermal capacity of the Gamalama Volcano. The analysis of normalized differential vegetation index (NDVI) utilized in the calculation of LST has revealed that vegetation growth has occurred subsequent to certain volcanic eruptions. As per the LST data, the average temperature of the surface within the crater escalated to 38.472 °C during the eruption of 1997, thereby establishing it as the maximum temperature recorded in the past half-century. The volcanic activity of Gamalama Volcano was elucidated through the utilization of the LST technique, which has the capacity to cover various temporal intervals. The congruence between the LST data derived from Landsat and ASTER data substantiates the dependability of the LST methodology. The geothermal potential of approximately 16 °C has been observed in the crater and sand region of the volcano, along with the identification of supplementary hot spots in the north-eastern and western regions of the volcano’s primary structure. The utilization of Landsat 8 band combinations and band ratios has substantiated the presence of an area exhibiting elevated geothermal potential within the andesite and basaltic andesite geological formations. The practicality of utilizing multi-source optical satellites for monitoring volcanic activity has been exemplified by the multiple eruptions that have occurred at Gamalama Volcano. Furthermore, this technology could potentially be employed for conducting exploratory research into the geothermal potential of the region.
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Rakhmat Dwi Putra | Tjahyo Nugroho Adji | Eko Haryono

Kuwait Journal of Science, Volume 52, Issue 3, July 2025, 100422

Abstract

Tropical cockpit karst, characterized by hilly topography, steep slopes, and thin soil layers, is highly susceptible to land degradation in the form of karst rocky desertification (KRD). KRD occurs due to acute soil erosion in karst environments, leading to the exposure of bedrock. This study aims to provide a comprehensive analysis of KRD, accurately assess soil erosion rates in cockpit karst landscapes, and identify the contributing factors. The research was conducted within the Seropan underground river catchment area in the Gunungsewu Karst region. KRD was identified using an image transformation approach employing the Karst Rocky Desertification Index (KRDI). Soil loss estimation was performed using the updated Revised Universal Soil Loss Equation (RUSLE) method, incorporating the KRD factor to enhance its applicability in karst environments. The results demonstrate that KRDI is highly effective in identifying KRD. Approximately 40 % of the study area exhibits moderate to severe KRD levels, predominantly found on the slopes of conical hills, where the primary driving factors are deforestation, land clearing for dryland agriculture, and abandonment of agricultural land. The estimated total soil loss in the study area is 4975.01 tons per year, with the highest contribution occurring at the intense soil loss level. The intense to extremely intense-severe soil loss levels are correlated with the steep slopes of conical hills, highlighting the significant role of topography in soil degradation within tropical karst environments.

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Urbanization has brought innovation, employment but also pollution, heat, land degradation and a human health crisis. The challenge is how to revitalize degraded urban areas, while prioritizing ecological, social, and economic sustainability. Tackling these challenges requires innovative and transdisciplinary approaches to land restoration that are not adequately covered in most urban planning /landscape architecture university courses. 

To help bridge this gap,  we have launched (07/05) an open source global course, intended for universities and training institutions in the fields of urban planning / landscape architecture/ urban geography/ land administration and related courses worldwide. You will learn how you can access it, what this course is about and about related upcoming networking and training opportunities. read more

Fakultas Geografi Universitas Gadjah Mada (FGE UGM), sebagai Implementer Partner Program Indonesia’s FOLU Net Sink 2030, menyelenggarakan Focus Group Discussion (FGD) pertama bertajuk “Penyamaan Persepsi Hasil Kajian Landscape Dynamic dan Geoportal”. Kegiatan ini berlangsung pada 5–6 Mei 2025 di Hotel Santika Yogyakarta dan menjadi bagian penting dalam menyelaraskan hasil kajian lapangan dengan arah kebijakan iklim nasional.

FGD ini bertujuan untuk memetakan persepsi atas praktik baik kegiatan FOLU tahun 2024 sebagai dasar penyusunan indikator Ecosystem-based Approach (EbA) yang relevan dengan konteks dinamika lanskap Indonesia. Selain itu juga untuk mengidentifikasi theoretical gap antara kebijakan perubahan iklim berbasis FOLU Net Sink 2030 dengan praktik ekosistem di level tapak untuk penguatan sistem Geoportal. read more

Fakultas Geografi Universitas Gadjah Mada (UGM) turut berpartisipasi dalam U21 Nature Positive Workshop yang diselenggarakan oleh Aliansi U21 di University of Sydney pada 1–5 April 2025. Kegiatan ini menjadi wadah untuk berbagi pengetahuan mengenai restorasi ekosistem dan perlindungan biodiversitas, sekaligus membangun jejaring kolaboratif dalam bidang pendidikan dan penelitian di masa datang.

Workshop ini dihadiri oleh perwakilan mitra dari berbagai negara, antara lain Afrika Selatan, Skotlandia, Selandia Baru, Chile, Inggris, Australia, dan Amerika Serikat. Para peserta bersama-sama menyusun proposal penelitian kolaboratif antar anggota Aliansi U21. read more

Fakultas Geografi Universitas Gadjah Mada (UGM) menunjukkan komitmennya dalam memperkuat kolaborasi antar institusi melalui keterlibatannya dalam workshop penyusunan kurikulum edukasi restorasi lanskap di Asia (Asian Restoration Education Curriculum Design) yang diinisiasi oleh CIFOR-ICRAF. Kegiatan ini berlangsung pada 14–18 April 2025 di CIFOR-ICRAF Campus, Bogor.

Restorasi Lanskap (Landscape Restoration) ini menjadi salah satu bidang kajian interdisiplin yang mengedepankan kolaborasi antar institusi. Hal ini tidak terlepas dari adanya ketidakpastian di masa datang salah satunya dipicu oleh perubahan iklim yang kini dampaknya dirasakan oleh berbagai negara secara global. Olehnya, inisiatif pengembangan kurikulum menjadi langkah strategis dalam memperkuat pemahaman dan praktik restorasi lanskap di kawasan Asia.

Fakultas Geografi UGM bersama mitra institusi berperan aktif dalam mengeksplorasi dan mengembangkan kurikulum kolaboratif mengenai restorasi lanskap sebagai panduan dasar yang dapat diintegrasikan ke dalam sistem pendidikan di perguruan tinggi di Asia.
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Pertumbuhan jumlah penduduk yang pesat dapat mendorong urbanisasi, yang pada akhirnya meningkatkan emisi karbon ke udara dan memengaruhi perubahan iklim global. Untuk memperkuat ketahanan terhadap perubahan iklim, diperlukan perencanaan yang matang. Salah satu pendekatan yang dapat diterapkan adalah penggunaan lahan secara berkelanjutan.

Hal ini disampaikan Prof. Shew-Jiuan Su, Ph.D., Profesor Departemen Geografi dan Associate Vice President for General Affairs di National Taiwan Normal University, pada acara Geotalk 2025 di Auditorium Merapi, Fakultas Geografi Universitas Gadjah Mada (UGM) pada Rabu (22/1). Ia menekankan bahwa perencanaan tata guna lahan yang berkelanjutan merupakan kunci dalam menghadapi tantangan perubahan iklim. read more

Laboratorium Geomorfologi Lingkungan dan Mitigasi Bencana, Fakultas Geografi Universitas Gadjah Mada (UGM) bekerjasama dengan PT Sinar Mas Agro Resources and Technology Tbk untuk melaksanakan pelatihan pemetaan tanah digital atau Digital Soil Mapping (DSM). Pelatihan ini berlangsung selama empat hari, Senin (9/12) hingga Kamis (12/12) di Gedung B Fakultas Geografi UGM.

Pelatihan bertujuan untuk mengembangkan dan menerapkan ide-ide baru, meningkatkan proses dan prosedur pemetaan tanah dalam pertanian sehingga dapat melengkapi dan memperbarui sistem lama yang telah diterapkan, salah satunya adalah penggunaan Machine Learning sehingga dapat mencapai efisiensi pemetaan tanah. read more

Fakultas Geografi Universitas Gadjah Mada (UGM) bekerja sama dengan Pusat Pendidikan dan Pelatihan Sumber Daya Manusia Kementerian Lingkungan Hidup dan Kehutanan menggelar Pelatihan Pemodelan Landscape Dynamic. Kegiatan ini bertujuan mendukung Program Indonesia’s FOLU Net Sink 2030 dengan meningkatkan kapasitas sumber daya manusia dalam pengelolaan lingkungan dan sumber daya alam berkelanjutan yang berlangsung selama empat hari (22-24/11) di Hotel Porta by Ambarukmo, Yogyakarta. 

Pelatihan ini juga mendukung beberapa tujuan pembangunan berkelanjutan (Sustainable Development Goals/SDGs), antara lain nomor 4 (pendidikan yang baik), 5 (kesetaraan gender), 11 (kota dan komunitas yang berkelanjutan), 12 (konsumsi dan produksi yang bertanggung jawab), 13 (penanganan perubahan iklim), 14 (menjaga ekosistem laut), 15 (menjaga ekosistem darat), dan 17 (kemitraan untuk mencapai tujuan).  read more

The Faculty of Geography, Universitas Gadjah Mada, has been working with experts across the globe to create a global course on “Trigger Change! Innovative Urban Solutions for Land Restoration, A Global Course”. This global course is an initiation from the G20 (Group of Twenty) and the EU (European Union). The G20 Leaders’ Declaration, issued on 22nd November 2020, launched a “Global Initiative on Reducing Land Degradation and Enhancing Conservation of Terrestrial Habitats”. This declaration brought immense impacts and efforts to mitigate the land degradation from different perspectives. Based on a voluntary basis, the G20 countries share the ambition to achieve a 50 percent reduction in the amount of degraded land by 2040. The G20 Global Land Initiative (G20-GLI) with oversight from the United Nations for Combatting Climate Change and Desertification (UNCCD), will focus on capacity building, engaging the private sector and civil society, and showcasing success. read more