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Indonesian Journal of Geography

ijg
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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.

Arjuna Subject : -

Articles 433 Documents

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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.

Assessing the Capability of Sentinel-2A Data for Mapping Seagrass Percent Cover in Jerowaru, East Lombok Muhammad Afif Fauzan; Ignatius S. W. Kumara; Rifka N. Yogyantoro; Satrio W. Suwardana; Nurul Fadhilah; Intansania Nurmalasari; Santi Apriyani; Pramaditya Wicaksono
Indonesian Journal of Geography Vol 49, No 2 (2017): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Remote sensing technology has been widely used in various applications related to natural resources and environment monitoring. In this paper, we evaluated the capability of new Sentinel-2A image to map the distribution and percent cover of seagrass in optically shallow water of Jerowaru coastal area, East Lombok. Seagrass distribution map was produced from radiometrically and geometrically corrected Sentinel-2A image with overall accuracy of 61.9%. Using empirical model, seagrass percent cover was predicted with maximum coefficient of determination (R2) of 0.51 and standard error of estimate (SE) of 19.4%. The results suggest that Sentinel-2A image can be used to perform seagrass mapping time and cost-effectively and can be further improved by incorporating more robust empirical modeling technique.

Review on Tsunami Risk Reduction in Indonesia Based on Coastal and Settlement Typology Djati Mardiatno; M. Ngainul Malawani; Dandun Wacono; Despry Nur Annisa
Indonesian Journal of Geography Vol 49, No 2 (2017): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

This research aims to identify various coastal and settlement typology as the basis to determine action plan for reducing tsunami risk. The action plan were issued by referring to priority level of tsunami management. Comparative analysis was applied through comparing different coastal and settlement typology at the selected coastal area, considering the tsunami risk zones determined by National Disaster Management Agency (BNPB). The results show that mitigation strategies can be distinguished in various coastal and settlement typology for each priority area, i.e. in Mentawai megathrust, Sunda Strait and the southern part of Java, Bali region and Nusa Tenggara, and Papua region. The components of action plan should be conducted in accordance with the priority level of each region.

Assessing the Spatial-Temporal Land use Change and Encroachment Activities Due to Flood Hazard in North Coast of Central Java, Indonesia Imam Setyo Hartanto; Rini Rachmawati
Indonesian Journal of Geography Vol 49, No 2 (2017): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Demak is known as the second largest region suffering land use change in Java’s North Coast. The topographic condition in downstream affects this area becomes susceptible with flood hazard. This research aims to assess the interactions between flooding, land use change and encroachment activities in Mijen and Wedung sub districts, Demak region, Central Java, Indonesia. This research combines the Driving Force, Pressure, State, Impact and Response (DPSIR) analysis. The supervised classification by Maximum Likelihood of time series Landsat images (2000, 2009 and 2014) was chosen for land cover analysis. The land use change shows that paddy field area descended almost 6%, mangrove forest fall 79% meanwhile settlement grown up almost double in 2000-2014. The result of overall accuracy assessment is 78.23%. The DPSIR result shows that land use change not too affect the flood events but floods influence land use pattern in north and south area of Mijen and Wedung.

An Overview of Indonesia’s Maritime Strategy buddy suseto; Zarina Othman; Farizal Bin Mohd Razalli
Indonesian Journal of Geography Vol 50, No 2 (2018): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

As one of the consent maritime on earth, Indonesia has no maritime strategy. Maritime strategy is important not only to protect state’s maritime pathway, but also as part of a national strategy. This article is designed to provide an understanding way for the Indonesian readers to urgently prepare and design a maritime strategy. It is argued that a maritime strategy for Indonesia is needed because of the changing landscape of the international threat such maritime security nontraditional issues. It affects the international trade through the Malacca Strait, Sunda Strait, and Lombok Strait. Data for the articles have been collected from secondary reliable sources. The Early finding of the study suggests that Indonesia needs to shape a maritime strategy to reduce threats at sea and guarantee the security most importantly in the archipelagic sea-lanes (ASL) as an international route. In conclusion, a brief overview of the study indicates that Indonesia urgency needs to establish a maritime strategy.

Geomaritime-Based Marine and Fishery Economic Development in Maluku Islands Atikah Nurhayati; Agus Heri Purnomo
Indonesian Journal of Geography Vol 49, No 2 (2017): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

The design of national economic development should never ignore three important aspects, namely integration, and sustainably and local contexts. Insufficient comprehension over these three aspects has caused delays of economic progress in several regions like Maluku. This region is characterized with archipelagic geo-profile where marine and fisheries resources are abundant but economic progress is sluggish. To catch up with the achievement shown by regions in the western part of the country, there must by effective efforts done in Maluku. This research is aimed at analyzing the three aspects mentioned above as related to acceleration of marine and fisheries economic development based on the region’s maritime geo-profile. In line with it, primary and secondary data were applied on a SWOT Analytical Approach. Based on the analysis, it was concluded that acceleration of marine and fisheries economic development in Maluku can be carried out through both local and national policies focused on facilitating prospective economic players in making massive investment in the marine and fisheries sector. Among others, this should be done by improving the capacity of Maluku marine ports and directing them to be local economic transmiters, through more effective functions as hubs for ships carrying commodities and products for both national and international markets. This research found that in line with it, a pre-requirement that has to be advanced by the government is detailed zoning of marine and fisheries resources, which is supported by a legal umbrella.

Hydro-chemical Survey and Quantifying Spatial Variations in Groundwater Quality in Coastal Region of Chennai, Tamilnadu, India – a case study Kishan Singh Rawat; T. German Amali Jacintha; Sudhir Kumar Singh
Indonesian Journal of Geography Vol 50, No 1 (2018): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

The good quality of groundwater is important for the purpose of future planning and management. The present study has been undertaken to provide an overview on the status of groundwater quality through physicochemical parameters namely pH, alkalinity, total hardness, total dissolved solids, chloride, fluoride, nitrate, phosphate and iron through laboratory analysis. Samples have been collected from seven wells located in Chennai costal region of state Tamilnadu, India. The laboratory-based results shows that the mean value of pH is 7.29, alkalinity (308.57 mg/l), total hardness (285.71 mg/l), chloride (175.71 mg/l), iron (0.71 mg/l), nitrate (13.57 mg/l), phosphorus (2.71 mg/l) and total dissolved solids (924 mg/l), respectively. The geo-database water quality parameters were created in Geographical an Information System. Further, the kriging a geo-statistical method of interpolation is applied to know the health of groundwater in the then-sampled area. This interpolation method has been used to predict spatial distribution physicochemical parameters in the form of contour. Local planners and policy makers may utilize these results for efficient management of groundwater resources in this area.

Applying GIS in Analysing Black Spot Areas in Penang, Malaysia Wan Muhammad Taufiq Wan Hussin; Tarmiji Masron; Mohd Norarshad Nordin
Indonesian Journal of Geography Vol 50, No 2 (2018): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

This study aims to analyze fatal accident rate involving all vehicle types in the North East District of Penang. It covers fatal accident data within the duration of three years from 2011 till 2013. The primary objective is to analyze the spatial pattern and fatal accident black spot areas using Geographic Information System (GIS) application. Average Nearest Neighbor (ANN) tool is used to analyze fatal accident spatial pattern, while Kernel Density Estimation (KDE) method is utilized for fatal accident analysis. The Fatal Accident rates in 2011, 2012 and 2013 were the highest with each accounted up to 90, 88 and 91 cases. The result of ANN shows that the fatal accident pattern for 2011, 2012 and 2013 is clustered with null hypothesis rejected. The KDE analysis result shows that most fatal accident black spot areas happened at main road areas or segments.

Sea Level Rise of Sumatera Waters based on Multi-Satellite Altimetry Data Isna Uswatun Khasanah
Indonesian Journal of Geography Vol 50, No 2 (2018): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

The information of sea level rise was needed in the Indonesia as archipelago country to management risk and development coastal area. This research study took in West Sumatra waters, because the majority people have lived in coastal area and some areas is located below 100 m above Mean Sea Level (MSL). The sea level data was taken from multi-satellite altimetry, they are Topex/Poseidon, Jason-1, and Jason-2. The period of data started from 1993 until 2015.Preliminary data processing of satellite altimetry was done by global test and post-processing of satellite altimetry data. The sea level rise analysis done by linear regression methods. Linear regression formula of sea level rise in West Sumatra Waters during the period was y = 1.586 + 0.0000113x. The change of sea level during period 1993 until 2015 was 3.394 cm with mean sea level rise value was 1.35 mm/year

Use of Geographically Weighted Regression (GWR) Method to Estimate the Effects of Location Attributes on the Residential Property Values Mohd Faris Dziauddin; Zulkefli Idris
Indonesian Journal of Geography Vol 49, No 1 (2017): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

This study estimates the effect of locational attributes on residential property values in Kuala Lumpur, Malaysia. Geographically weighted regression (GWR) enables the use of the local parameter rather than the global parameter to be estimated, with the results presented in map form. The results of this study reveal that residential property values are mainly determined by the property’s physical (structural) attributes, but proximity to locational attributes also contributes marginally. The use of GWR in this study is considered a better approach than other methods to examine the effect of locational attributes on residential property values. GWR has the capability to produce meaningful results in which different locational attributes have differential spatial effects across a geographical area on residential property values. This method has the ability to determine the factors on which premiums depend, and in turn it can assist the government in taxation matters.

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