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Jurnal Geografi Lingkungan Tropik (Journal of Geography of Tropical Environments)
Published by Universitas Indonesia
ISSN : -     EISSN : 25979949     DOI : http://dx.doi.org/10.7454/jglitrop
Core Subject : Science, Social,
Earth & Planetary Sciences Environmental Science
Jurnal Geografi Lingkungan Tropik (JGLITrop) specialized to publish scientific articles that reveal a uniqueness and dynamics of tropical geographic environments, including their physical and human phenomena and interaction between those components. JGLITrop welcomes to articles about physical and human geography development, as well the combination between both and those who highlight environment dynamics from multidisciplinary approaches. Team of editorial board and peer reviewers from Department of Geography University of Indonesia and other distinguished universities and institution (e.g., BPPT, LAPAN, BIG, LIPI) guarantee the scientific quality of the paper issued in the journal.
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Ilmu Bumi dan Planet (Lain-Lain)
Articles 5 Documents
 1 
Search results for , issue "Vol 3, No 2 (2019): August" : 5 Documents clear
Mapping Land Cover Based on Time Series Synthetic Aperture Radar (SAR) Data in Klaten, Indonesia Vidya Nahdhiyatul Fikriyah
Journal of Geography of Tropical Environments Vol 3, No 2 (2019): August
Publisher : Open Journal System

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (424.925 KB) | DOI: 10.7454/jglitrop.v3i2.67

Abstract

Information on the existing land cover is important for land management and planning because it can represent the intensity, location, and pattern of human activities. However, mapping land cover in tropical regions is not easy when using optical remote sensing due to the scarcity of cloud-free images. Therefore, the objective of this study is to map the land cover in Klaten Regency using a time-series Sentinel-1 data. Sentinel-1 data is one of remote sensing images with Synthetic Aperture Radar (SAR) system which is well known by its capability of cloud penetration and all-weather observation. A time-series Sentinel-1 data of both polarisations, VV and VH were automatically classified using an unsupervised classification technique, ISODATA. The results show that the land cover classifications obtained overall accuracies of 79.26% and 73.79% for VV and VH respectively. It is also found that Klaten is still dominated by the vegetated land (agriculture and non-agricultural land). These results suggest the opportunity of mapping land cover using SAR multi temporal data.Keywords: Land cover; Synthetic Aperture Radar; Time series; Sentinel-1; KlatenDOI: http://dx.doi.org/10.7454/jglitrop.v3i2.67
Pemodelan aliran lahar Gunung Api Merapi untuk perhitungan risiko kerugian pada penggunaan lahan terdampak di bantaran Sungai Boyong, Pakem, Sleman, D.I. Yogyakarta Verry Octa Kurniawan; Estuning yas Wulan Mei; Danang Sri Hadmoko
Journal of Geography of Tropical Environments Vol 3, No 2 (2019): August
Publisher : Open Journal System

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (5521.029 KB) | DOI: 10.7454/jglitrop.v3i2.64

Abstract

Abstrak. Penelitian ini bertujuan untuk membuat pemodelan aliran lahar Gunung Merapi di Sungai Boyong. Selain itu penelitian ini juga mengidentifikasi penggunaan lahan yang terdampak dari model tersebut, serta menganalisis risiko kerugiannya menjadi fokus penelitian ini. Pemodelan aliran lahar dibuat menggunakan aplikasi LAHARZ dengan menggunakan data DEMNAS 2018 dan 3 skenario volume lahar bedasarkan kejadian erupsi Gunung Merapi tahun 1994. Identifikasi penggunaan lahan terdampak dilakukan menggunakan interpretasi citra sentinel 2B 2018 dengan metode Maximum Likelihood Area (MLA) yang dilanjutkan verifikasi dengan metode purposive sampling di lapangan. Analisis resiko kerugian dilakukan dengan menentukan penggunaan lahan yang memiliki nilai ekonomi, yang selanjutnya diklasifikasikan berdasarkan tingkat kerusakannya berdasarkan tingkat bahaya aliran lahar. Hasil penelitian ini menunjukkan pengaruh dari volume lahar dan kelerengan Gunung Merapi terhadap penggunaan lahan di sekitarnya. Proses generalisasi pada data DEM tidak memiliki perbedaan yang signifikan terhadap model aliran lahar. Morfologi sungai sangat berpengaruh dalam output pemodelan. Citra Sentinel-2B sesuai untuk identifikasi penggunaan lahan eksisting dengan skala yang digunakan adalah 1:10.000. Penggunaan lahan terdampak terklasifikasikan menjadi 6 dan 3 diantaranya memiliki nilai ekonomi yaitu permukiman, bangunan, dan sawah. Terdapat 16 Dusun yang terdampak bahaya aliran lahar dengan penggunaan lahan permukiman yang paling besar total kerugiannya, sedangkan penggunaan lahan sawah paling luas area terdampaknya.Keywords: Lahar, Merapi, Penggunaan Lahan, Risiko Abstract. This study aims to conduct lahar of Mount Merapi on the Boyong River modeling. In addition, this study also to identificate the affected land use of the model, and analyze the risk of loss which are the focus of this study. Lahar modeling was made by using the LAHARZ application from DEMNAS 2018 data and 3 lahar volume scenarios based on the eruption of Mount Merapi in 1994. Identification of affected land use was carried out by using Sentinel-2B 2018 image interpretation with Maximum Likelihood Area (MLA) method, continued by verification using purposive sampling method in the field. Loss risk analysis was done by determining land use that has an economic value, which followed by classifying the level of damage based on the hazard level of lahar. The results of this study showed the effect of volcanic lahar volume and slope of Mount Merapi on surrounding land use. The generalization process in the DEM data did not have a significant difference to the lahar model. River morphology is very influential in this modeling output. Citra Sentinel-2B is suitable for identifying existing land use with the scale used is 1:10.000. The use of affected land was classified into 6 and 3 of which have economic values, namely settlements, buildings, and rice fields. There are 16 hamlets that are affected by the danger of lahar with residential land use which has the greatest total loss, while the use of wetland areas is the most extensive area of this danger.Keywords: Lahar, Landuse, Merapi, RiskDOI: http://dx.doi.org/10.7454/jglitrop.v3i2.64
Ekstraksi Digital Surface Model (DSM) dari Data Unmanned Aerial Vehicle (UAV) Berbasis Point Cloud Indra Laksana; R Suharyadi; M. Pramono Hadi
Journal of Geography of Tropical Environments Vol 3, No 2 (2019): August
Publisher : Open Journal System

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (359.148 KB) | DOI: 10.7454/jglitrop.v3i2.59

Abstract

Abstrak. Akuisisi data dengan menggunakan pesawat tanpa awak semakin sering dilakukan. Penelitian ini memodelkan data elevasi dari pengukuran lapangan dengan menggunakan pesawat tanpa awak. Tujuan dari penelitian ini :(1) untuk menguji kemampuan pesawat tanpa awak dalam mengakuisisi data elevasi, dan (2) untuk membandingkan data elevasi jika ditambahkan data point cloud dan data pengukuran batimetri. Metode pengolahan dengan menggunakan data point cloud dilakukan dengan pertama-tama mencocokkan titik kunci. Pencocokan titik kunci mengkaitkan seluruh hasil foto udara hingga membentuk satu kesatuan area yang telah difoto. Selanjutnya dilakukan penampalan titik ikat pada area yang telah terbentuk dari pencocokan titik kunci. Titik ikat berfungsi sebagai koreksi data pada saat pesawat tanpa awak melakukan pengambilan data. Foto udara yang telah dikoreksi kemudian diolah untuk mendapatkan data point cloud. Point cloud berguna sebagai data penyusun ortofoto dan data Digital Surface Model (DSM). Pengolahan data point cloud hingga menghasilkan DSM dilakukan dengan menggunakan software Pix4D dan Agisoft photoscan. Hasil yang diperoleh menunjukkan bahwa terjadi peningkatan kemampuan DSM ketika data pointcloud ditambahkan data titik ikat dan data pengukuran batimetri. Sehingga dapat disimpulkan bahwa akuisisi data menggunakan pesawat tanpa awak mampu menghasilkan data yang dapat dipercaya. Selain dapat dipercaya akuisisi data dengan pesawat tanpa awak lebih murah jika dibandingkan dengan akuisisi data dengan foto udara.Keywords:  digital surface model, pesawat tanpa awak, titik ikat Abstract. Data acquisition using unmanned aircraft is increasingly being done. This study models elevation data from field measurements using unmanned aircraft. The purpose of this study: (1) to test the ability of unmanned aircraft to acquire elevation data, and (2) to compare elevation data if added point cloud data and bathymetry measurement data. The processing method using point cloud data is done by first matching key points. Matching key points links all aerial photography results to forming a single unit area that has been photographed. Next, a tie point is carried out in the area formed from matching key points. Tie points function as data correction when unmanned aircraft take data. Corrected aerial photos are then processed to obtain point cloud data. Point cloud is useful as orthophoto compiler data and Digital Surface Model (DSM) data. Point cloud data processing to produce DSM is done using Pix4D and Agisoft photoscan software.The results obtained showed that there was an increase in DSM capabilities when point cloud data was added to the tie point data and bathymetry measurement data. So, it can be concluded that data acquisition using unmanned aircraft is able to produce reliable data. Besides being reliable, data acquisition with unmanned aircraft is cheaper compared to data acquisition with aerial photography.Keywords: unmanned aerial vehicle, ground c point, Digital surface modelDOI: http://dx.doi.org/10.7454/jglitrop.v3i2.59
Spatial Analysis of Coastline Change by Remote Sensing in the North Coast of Karawang Regency Roberto Pasaribu; Firman Agus H.; Liliek Soeprijadi
Journal of Geography of Tropical Environments Vol 3, No 2 (2019): August
Publisher : Open Journal System

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (621.369 KB) | DOI: 10.7454/jglitrop.v3i2.71

Abstract

The existence of the coast in the northern part of Karawang Regency is very worrying. Seawater that was far up to tens of meters from the side of the road, is now on the lip of the road, even some parts of the road are cut off due to abrasion of seawater. Some villages were affected by abrasion erosion. One of the effects of damage due to abrasion and sedimentation is the occurrence of shoreline changes. This change in coastline will affect people's lives and spatial planning for the development of the area. For this reason, this study aims to determine the extent and rate of shoreline changes that occurred on the coast of Karawang Regency in the periods of 1989, 1995, 2001, 2005, 2009, 2016, and 2018. The shoreline data was obtained from the extraction of Landsat 3 MSS, Landsat 5 TM, Landsat 7 ETM +, and Landsat 8 OLI-TIRS after the NDWI process was previously carried out. While the rate of change is calculated at 6 sample point locations scattered along the northern coast of Karawang Regency. The results showed that the largest area damaged by abrasion occurred in Sedari Village covering an area of 166.802 hectares, and the area formed by the largest sedimentation occurred in Muara Cilamaya Village at 276,318 hectares. Meanwhile, the fastest rate of shoreline change due to abrasion occurred in Sukajaya Village at 10 meters /year, while the slowest in Sedari Village at 3.77 meters / year. The fastest sedimentation process in Muara Cimalaya Village is 4.5 meters / year, while the late one in Tanjung Pakis Village is 3.09 meters / year.Keywords: Abrasion, Accretion, Coastline Changes, KarawangDOI: http://dx.doi.org/10.7454/jglitrop.v3i2.71
Study of physical environment based on land system map of Kabupaten Bandung Mutia Kamalia Mukhtar; Nurwadjedi Nurwadjedi
Journal of Geography of Tropical Environments Vol 3, No 2 (2019): August
Publisher : Open Journal System

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (482.05 KB) | DOI: 10.7454/jglitrop.v3i2.53

Abstract

The environmental  damage in Kabupaten Bandung is critical. To solve the environmental problems,  the integrated spatial data of the physical environment is required.   Land system data as  the integrated spatial data which describes the characteristics of land are useful for the analysis and  evaluation of the environmental conditions. The objective of the study is to describe the characteristics of the physical environment of Kabupaten Bandung based on the land system map  for the input of  decision-making in achieving  sustainable development. The study used the spatial analysis and descriptive analytical method. The land system data was obtained  from the Badan Informasi Geospaasial (BIG). The results show that the landforms in Kabupaten Bandung are dominated by volcanic and fluvial landforms. The volcanic landforms has morphology dominated by mountainous areas with the slope steepness more than 45% and  the soil types of andosols. The land capability of these mountainous areas belongs to grade 7 (for conservation areas). The fluvial landforms are lacustrine plains, which are prone to flood due to inundation.  From this study, it is concluded that the land utilization in Kabupaten Bandung, particularly in mountainous areas, is not in accordance with the land  carrying capacity. To achieve the sustainable development, the land utilization should consider the regulation of spatial planning, by which the lands with slope steepness more than 40% are categorized as protected areas. Keywords: Land system, land characteristics, landform, suistanable developmentDOI: http://dx.doi.org/10.7454/jglitrop.v3i2.53

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