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Indonesian Journal of Geography

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Published by Universitas Gadjah Mada

ISSN : 00249521 EISSN : 23549114 DOI : -

Core Subject : Science,

Earth & Planetary Sciences

Indonesian Journal of Geography ISSN 2354-9114 (online), ISSN 0024-9521 (print) is an international journal of Geography published by the Faculty of Geography, Universitas Gadjah Mada in collaboration with The Indonesian Geographers Association. Our scope of publications includes physical geography, human geography, regional planning and development, cartography, remote sensing, and geographic information system. IJG publishes its issues three times a year in April, August, and December.

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Articles 14 Documents

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Search results for , issue "Vol 51, No 1 (2019): Indonesian Journal of Geography" : 14 Documents clear

Integrated Framework for Identification of Polluted Zones in Coastal Areas of Thiruvallur District of Tamil Nadu (India) Kishan Singh Rawat
Indonesian Journal of Geography Vol 51, No 1 (2019): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

In this research work, hydro-geochemical characteristics were determined from twenty groundwater samples and classified into water quality zones on the basis of the World Health Organization (WHO 2006) using inverse distance weighted interpolation technique. Groundwater samples were analyzed with respect to calcium (Ca2+), magnesium (Mg2+), sodium (Na+), HCO3, total nitrate (NO2+NO3ˉ), chloride (Cl−), sulphate (SO42−), total dissolved solids (TDS), hydrogen ion concentration (pH) and electrical conductivity (EC) were measured form groundwater samples. The water quality indices (WQI1 and NPI = WQI2) were used to categorize the water. Water Quality Index (WQI) value suggest that the 65% groundwater samples (excellent + good) are safe for drinking uses and 35% groundwater samples (very poor + poor) needs treatment before consumptive uses from WQI1. Further, NPI (WQI2), shows 40% and 60% of groundwater falls under good and poor condition respectively. The findings highlight that the groundwater of few areas requires some degree of treatment before consumptive uses.

An Assessment of Property Tax Administration in Edo State, Nigeria Toju Francis Balogun
Indonesian Journal of Geography Vol 51, No 1 (2019): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

ABSTRACTThe mode of administration of property tax determines its buoyancy. The study utilizes key informant method to examine the mode of operation of Edo State Land Use Charge. The study observes that property tax revenue mobilization in Benin Metropolis is ineffective due to unsystematic tax administration procedure employed by Land Use Charge Department. The study shows that inadequate personnel, public contempt, limited coverage of the tax base and shrouded valuation method are major problems of the Land Use Charge in Benin metropolis. It also reveals that the current property tax administration will not appreciably enhance the internally generated revenue except the mode of operation is reformed. To overcome these challenges it is recommended among others that the implementation of modern and transparent assessment methods for real estate utilizing remote sensing and GIS integrated with computer-assisted mass appraisal (CAMA) be incorporated through a public-involved debate on property tax reform. Modus administrasi pajak properti menentukan daya apung. Penelitian ini menggunakan metode informan kunci untuk memeriksa modus operasi dari Edo Negara Penggunaan Tanah Charge. Penelitian ini mengamati bahwa pajak properti mobilisasi pendapatan di Benin Metropolis tidak efektif karena prosedur administrasi perpajakan sistematis dipekerjakan oleh Penggunaan Tanah Mengisi Department. Studi ini menunjukkan bahwa personil yang tidak memadai, penghinaan publik, cakupan terbatas basis pajak dan metode penilaian diselimuti masalah utama dari Penggunaan Tanah Mengisi di Benin metropolis. Ia juga mengungkapkan bahwa administrasi pajak properti saat ini tidak akan lumayan meningkatkan pendapatan yang dihasilkan secara internal kecuali modus operasi direformasi. Untuk mengatasi tantangan ini dianjurkan antara lain bahwa pelaksanaan metode penilaian modern dan transparan untuk real estate memanfaatkan penginderaan jauh dan GIS terintegrasi dengan komputer-dibantu penilaian massa (CAMA) dimasukkan melalui debat publik-terlibat pada reformasi pajak properti.

Distribution of Nitrate Household Waste and Groundwater Flow Direction around Code River, Yogyakarta, Indonesia Muryanto Muryanto; Suntoro Suntoro; Totok Gunawan; Prabang Setyono; Afid Nurkholis; Nurisa Fajri Wijayanti
Indonesian Journal of Geography Vol 51, No 1 (2019): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

The nitrate concentrations in shallow groundwater of the Yogyakarta City and its surroundings has increased to about twenty times in the period 1985-2018. The objective of this study was to analyse the distribution of nitrate concentrations in water well around the Code River, Yogyakarta. Flownets mapping was performed to find out the distribution and direction of potential groundwater pollution. Nitrate concentration was analysed by taking 18 groundwater samples scattered in the upstream, midstream and downstream areas of the Code River. The results of this study indicate that nitrate concentrations in the water well of upstream and downstream areas could still be used as a source of drinking water and recreation-irrigation-livestock. Meanwhile, the nitrate concentration in water well of the midstream area of the Code River, Yogyakarta City, mostly (80% of the sample) did not meet all classes of water quality standards. Human activities in the densely populated settlements were the main factors that influence nitrate pollution. Furthermore, groundwater flow in the study area leads from north to south and towards the Code River. This condition indicates that the nitrate concentrations in the groundwater can be a source of a pollutant for the Code River.

Specifications of Cartographic Symbols for Indonesian Tactile Map Noorhadi Rahardjo; Ika Noor Muslihah M; Candra Sari Djati Kartika
Indonesian Journal of Geography Vol 51, No 1 (2019): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Visual impairment people require a means of information transfer which different from normal people, it needs to be touched or amplified by audio, including maps that apprise them of the objects and events occurring on Earth. Cartographic Sciences have developed tactile maps that offers touchable symbols for supporting blind and partially sighted people in recognizing the spatial distribution of geographical phenomena and their intercorrelation. Creating an informative tactile maps need a specific design of symbol, ancillary information, and map reproduction that meets the need and the capacity of its users. Unfortunately, there has been no international standardization for these map features that could be used as a foundation to build a standardization for our national tactile map. Therefore, this research adopted and modified the designs of tactile symbols published by the National Mapping Council of Australia, the Guidelines for Design of Tactile Graphics by American Printing House, the use of tactile variables by Vasconcellos, the Specifications of Topographic Elements Mapping by Bakosurtanal, and the application of visual variables of Bertin for cartographic mapping. The resultant symbol designs from the modification were applied to develop the tactile maps of Yogyakarta City on swell paper. Then, through interviews with map users (visually impaired people in the city), we evaluated these symbols from two aspects, comprehension of tactile variables and the types of the tactile maps required.

Groundwater resources mapping for small island using Geoelectrical Technique the case study of Ternate Island M. Pramono Hadi; Ramdani Salam; Rahim Achmad
Indonesian Journal of Geography Vol 51, No 1 (2019): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

The measurement of 2D geo-electrical using Wenner Alpha configuration was conducted in the shore line of northern part of Ternate island, in order to know the depth of interface and to analyze the aquifers in conjunction with estimation of ground water potential. Water quality analysis is also conducted in some dug wells, such as in situ water temperature, electrical conductivity, pH, turbidity, dissolved oxygen, and salinity.Due to laboratory analysis, the values of measured parameters of water quality from some dug wells meets to the standards referred, especially for drinking water. The result of interpretation from geo-electrical data showed the depth of interface less than 10m. From a drilled well data near shore line, indicate about 5m deep of interface. Base on geo-electrical survey, water quality analysis and field observation can be concluded that Ternate Island has limited potential of ground water, especially related to amount of fresh ground water. Which is now days, no alternative source yet of clean water for domestic use.

Preliminary Study of Total Suspended Solid Distribution in Coastal Ujung Pangkah Gresik Based Reflectance Value of Landsat Satellite Imagery Hendrata Wibisana; Bangun Muljo Soekotjo; Umboro Lasminto
Indonesian Journal of Geography Vol 51, No 1 (2019): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Total suspended solid (TSS) is one of the parameters that uses for detecting health in aquatic environments. The distribution of the TSS value in the water body will affect the aquatic ecosystem. In this research will be analyzed the distribution value of TSS during 5 year period by utilizing Landsat 8 satellite image data, where the developed method is extraction of reflectance value from Landsat 8 satellite image for 5 years using SEADASS and then compiled the TSS algorithm with reflectance value that already obtained on the existing conditions, the algorithm obtained is estimated over 5 years back to get a picture of change and distribution of TSS value. As a case study , the coast of Ujung Pangkah Gresik was taken which has the mouth of the river Bengawan Solo. The results obtained from this study illustrate the decrease of TSS value during that time period, so that with this decrease can be concluded that at the point of field coordinate, TSS value was decreasing and causing the erosion in the environment.

A Desktop Study to Determine Mineralization Using Lineament Density Analysis at Kulon Progo Mountains, Yogyakarta and Central Java Province, Indonesia Okki Verdiansyah
Indonesian Journal of Geography Vol 51, No 1 (2019): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

A geological study was conducted in Kulon Progo and its surrounding areas (Kulon Progo and Purworejo Regency). It focused on regional geology, tectonic configuration, geodynamics and magmatism, lithology and volcanology, and mineralization. Although there has been considerable research of mineralization in the area—particularly in Kokap (Kulon Progo Regency), Bagelen (Purworejo Regency) and Gupit (Magelang Regency), the potential of precious metals has not been determined due to data limitations. The study combined qualitative and semi-quantitative methods using a desktop geologic analysis, which facilitates lithology interpretation, volcanic boundary system, and lineament density assessment. The geology of the region is composed of an ancient volcanic complex of the Old Andesite Formation formed during the Late Oligocene-Miocene, and the mineralization in Kokap, Bagelen, and Gupit is epithermal. Based on the analysis results, the mineralization occurs in the central to proximal facies of the paleo-volcano, and the system ranges from 2.2 to 3.8 km in diameter. The manual analysis of the lineament density showed that the main direction of the lineaments was SE-NW with a maximum density of 2025.9 m/km2 and an anomaly limit of >1800 m/km2. In the combined semi-automatic analysis, the maximum density was 8.3 km/km2. The target area of mineralization included four anomalous areas, namely Bagelen-Kokap, Salaman, Kaligesing, and Loano, associated with the central and proximal facies of each small paleo-volcano.

Economic Value of Forest Hydrological Benefit of Musi Watershed: Case of Perapau Sub Watershed Nur Arifatul Ulya
Indonesian Journal of Geography Vol 51, No 1 (2019): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Forest area in upper Perapau sub watershed that provide a hydrological benefit for community living surrounding are now partially converted to plantations, dry land farms and paddy fields, whereas the forests are part of protected forest and wildlife reserve. The land cover change occurs due to lack of understanding about economic value of hydrological benefits of forests in the Perapau sub watershed. This study aims to determine the economic value of hydrological benefits of forests in Perapau sub watershed. Procurement cost method used to estimate the economic value of the hydrological benefits of the Perapau sub watershed. The economic value of hydrological benefits for household and agricultural purposes is 1.712 trillion rupiah and 11.056 billion rupiah. Based on the economic value of hydrological benefit, sustainability of forest in the upstream of Perapau sub watershed must be supported for sustainability of hydrological services of watershed.

Dynamical Link of Peat Fires in South Sumatra and the Climate Modes in the Indo-Pacific Region Raden Putra; Deni Okta Lestari; Edy Sutriyono; Sabaruddin Sabaruddin; Iskhaq Iskandar
Indonesian Journal of Geography Vol 51, No 1 (2019): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Peat fire is one of the environmental disasters occurring widespread during the dry season in South Sumatra. The region has long been recognized to have extensive peatland, hence it is considered as the vulnerable areas to fire. This study employs spatial analysis to evaluate the likely linked factors causing peat fire in the study area. Two interannual climate modes such as the El Niño – Southern Oscillation and Indian Ocean Dipole were considered to have affected the area with respect to climate anomaly at the 1995-2016 periods. This phenomenon was followed by the peat fire in many areas. There appears a close linkage between the occurrence of peat fires and climate anomaly. A number of hotspots tend to occur annually during the drought season. A significant number of hotspots took place during the 2006 pIOD and 2015 El Niño events due to a significant decrease in rainfall intensities.

Towards a Global View on Suburban Gentrification: From Redevelopment to Development Delik Hudalah; Nabilla Adharina
Indonesian Journal of Geography Vol 51, No 1 (2019): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

The gentrification literature, which is originated in the urban context, has now extended to suburb. Using content analysis on previous related case studies, this article shows that suburban gentrification is not necessarily a natural phenomenon resulting from disinvestment as the neighborhood lifecycle approach commonly suggests. As long as there is a development trigger, the suburb can gentrify anytime as it generally has a lower land value and a lower risk than urban area. The private sector and government play a key role in initiating and facilitating it to happen. In suburban context, the impacts of gentrification is complex, entailing varying negative and positive implications for the physical environment, the economies, and the society.

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