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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Association of Geographic Information Studies
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Journal DOI :
The Korean Association of Geographic Information Studies
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Volume & Issues
Volume 15, Issue 4 - Dec 2012
Volume 15, Issue 3 - Sep 2012
Volume 15, Issue 2 - Jun 2012
Volume 15, Issue 1 - Mar 2012
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A Study on the Extraction of a River from the RapidEye Image Using ISODATA Algorithm
Jo, Myung-Hee ;
Journal of the Korean Association of Geographic Information Studies, volume 15, issue 4, 2012, Pages 1~14
DOI : 10.11108/kagis.2012.15.4.001
A river is defined as the watercourse flowing through its channel, and the mapping tasks of a river plays an important role for the research on the topographic changes in the riparian zones and the research on the monitoring of flooding in its floodplain. However, the utilization of the ground surveying technologies is not efficient for the mapping tasks of a river due to the irregular surfaces of the riparian zones and the dynamic changes of water level of a river. Recently, the spatial information data sets are widely used for the coastal mapping tasks due to the acquisition of the topographic information without human accessibility. In this research, we tried to extract a river from the RapidEye imagery by using the ISODATA(Iterative Self_Organizing Data Analysis) classification algorithm with the two different parameters(NIR (Near Infra-Red) band and NDVI(Normalized Difference Vegetation Index)). First, the two different images(the NIR band image and the NDVI image) were generated from the RapidEye imagery. Second, the ISODATA algorithm were applied to each image and each river was generated in each image through the post-processing steps. River boundaries were also extracted from each classified image using the Sobel edge detection algorithm. Ground truths determined by the experienced expert are used for the assessment of the accuracy of an each generated river. Statistical results show that the extracted river using the NIR band has higher accuracies than the extracted river using the NDVI.
Development of a Web GIS-Based Real-Time Agricultural Flood Management System
Jung, Hyuk ; Jung, In-Kyun ; Park, Jong-Yoon ; Kim, Seong-Joon ;
Journal of the Korean Association of Geographic Information Studies, volume 15, issue 4, 2012, Pages 15~25
DOI : 10.11108/kagis.2012.15.4.015
This study is to develop a web-based real-time agricultural flood management system(RAFMS) for 378 agricultural reservoirs equipped with auto water level gauge stations. The RAFMS was designed to operate linking with Rural Agricultural Water Resource Information System(RAWRIS) which supports data viz. real-time rainfall and water level necessary for RAFMS. The system was constituted to monitor the floods simultaneously at each reservoir by calculating the real-time reservoir inflow from watersheds, water level, and release to downstream. In addition, the system has the prediction function for the flood by applying weather forecasting data from Korea Meteorological Administration(KMA).
A Study on Object-Based Image Analysis Methods for Land Cover Classification in Agricultural Areas
Kim, Hyun-Ok ; Yeom, Jong-Min ;
Journal of the Korean Association of Geographic Information Studies, volume 15, issue 4, 2012, Pages 26~41
DOI : 10.11108/kagis.2012.15.4.026
It is necessary to manage, forecast and prepare agricultural production based on accurate and up-to-date information in order to cope with the climate change and its impacts such as global warming, floods and droughts. This study examined the applicability as well as challenges of the object-based image analysis method for developing a land cover image classification algorithm, which can support the fast thematic mapping of wide agricultural areas on a regional scale. In order to test the applicability of RapidEye`s multi-temporal spectral information for differentiating agricultural land cover types, the integration of other GIS data was minimized. Under this circumstance, the land cover classification accuracy at the study area of Kimje (
) was 80.3%. The geometric resolution of RapidEye, 6.5m showed the possibility to derive the spatial features of agricultural land use generally cultivated on a small scale in Korea. The object-based image analysis method can realize the expert knowledge in various ways during the classification process, so that the application of spectral image information can be optimized. An additional advantage is that the already developed classification algorithm can be stored, edited with variables in detail with regard to analytical purpose, and may be applied to other images as well as other regions. However, the segmentation process, which is fundamental for the object-based image classification, often cannot be explained quantitatively. Therefore, it is necessary to draw the best results based on expert`s empirical and scientific knowledge.
A Spatial Statistical Approach to the Delimitation of CBD
Kim, Ho-Yong ; Kim, Ji-Sook ; Lee, Sung-Ho ;
Journal of the Korean Association of Geographic Information Studies, volume 15, issue 4, 2012, Pages 42~54
DOI : 10.11108/kagis.2012.15.4.042
The main purpose of this study is to suggest the spatial statistical approach suitable for the delimitation of Busan CBD. For this purpose, Getis-Ord
and both of IDW (Inverse Distance Weight) and FDB(Fixed Distance Band) were applied to delimit the CBD boundary. And then, the results of the CBD boundary were compared and verified with the methodologies of the previous studies. The result of IDW accorded with the previous study relating to the delimitation of the boundary of CBD, and the result of FDB was reflecting the characteristics of the mixed-use residential of a transition zone. As a result of the land use quotient, the mixed land use of residential and commercial was highly specialized in the boundary of FDB. These results will be able to support the understanding of urban spatial structure and the effective CBD management.
Development of Mobile Application for Cadastre Information Service
Lee, Geun-Sang ; Kim, Hyoung-Jun ;
Journal of the Korean Association of Geographic Information Studies, volume 15, issue 4, 2012, Pages 55~64
DOI : 10.11108/kagis.2012.15.4.055
This study developed a mobile application system for serving cadastral information needed to propel diverse cadastral works including cadastral resurvey efficiently. First, BlackPoint-Xr was selected as a spatial client engine to embody the cadastral information system based on mobile device including smart phone and tablet PC. The mobile cadastral information system contains functions such as finding location with GPS based on spatial information such as aerial photo, cadastral map, administrative map, and digital map, parcel search with address and lot number, finding land register including land address, the classification of land, and land price. Especially, this study developed functions which can analyze the measurement of distance, area, slope and cross-section elevation of land to apply construction work and land maintenance project. This system can support efficiently cadastral work and construction project by serving diverse cadastral information to users in field and can be also applied to the field of digital cadastral information.
Estimation of Urban Heat Island Potential Based on Land Cover Type in Busan Using Landsat-7 ETM+ and AWS Data
Ahn, Ji-Suk ; Hwang, Jae-Dong ; Park, Myung-Hee ; Suh, Young-Sang ;
Journal of the Korean Association of Geographic Information Studies, volume 15, issue 4, 2012, Pages 65~77
DOI : 10.11108/kagis.2012.15.4.065
This study examined changes in land cover for the past 25 years in Busan and subsequently evaluated heat island potential by using land surface temperature and observation temperature data. The results were as below. The urban area of Busan increased by more than 2.5 times for the past 25 years from 1975 to 2000. It was believed that an increase in the pavement area of city within such a short period of time was an unprecedented phenomenon unique to our country. It could be assumed that urban heat island would be worsened through this process. After analyzing the land temperature according to the land cover, it was shown that there were noticeable changes in the temperature of urban & built-up and mountain & forest areas. In particular, the temperature rose to
in industrial areas during the summer, whereas it went down to
in the urban areas at whose center there were mountains. It was found that heat island potential according to the level of land cover had various values depending on the conditions of land cover. Among the areas of urbanization, the industrial area`s heat island potential is 6 to
, and the residential and commercial area`s is
, so it has been found that there is high possibility to induce urban heat islands. Meanwhile, in the forest or agricultural area or the waterside, the heat island potential is
. With this study result, it is possible to evaluate the effects of temperature increase according to the urban land use, and it can be used as foundational data to improve urban thermal environment and plan eco-friendly urban development.
Analysis of Spatial Crime Pattern and Place Occurrence Characteristics for Building a Safe City
Heo, Sun-Young ; Moon, Tae-Heon ;
Journal of the Korean Association of Geographic Information Studies, volume 15, issue 4, 2012, Pages 78~89
DOI : 10.11108/kagis.2012.15.4.078
The purpose of this study is to examine the possibility of crime prevention in consideration of urban physical environment by analyzing the spatial distribution characteristics and pattern using actual crime occurrence data of the case city. The crime data was rebuilt by transforming them into geographic information system to analyze the spatial aspect of crime occurrence. The findings are as follows: a change from 2008 to 2011 is indicated with similar trend. But the local movements of crime hot spots are found. Moreover crimes were happening along the roads in linear pattern rather than inside of blocks in commercial area. This indicates the importance of environmental improvement of roads and open spaces. In addition it was found that the crime occurrence in a dangerous district can be reduced and prevented through the physical environment design and urban planning. The findings will contribute to promoting fundamental crime prevention as the physical environmental improvement in a city and to building a safe community as its result.
A Spatio-Temporal Variation Pattern of Oiling Status Using Spatial Analysis in Mallipo Beach of Korea
Kim, Tae-Hoon ; Choi, Hyun-Woo ; Kim, Moon-Koo ; Shim, Won-Joon ;
Journal of the Korean Association of Geographic Information Studies, volume 15, issue 4, 2012, Pages 90~103
DOI : 10.11108/kagis.2012.15.4.090
Mallipo is a representative beach contaminated by Hebei Spirit oil spill accident in December 2007. This study aims to compare the differences of two seasons (winter and summer) for the spatio-temporal variation patterns of oiling status in the whole area and divided five regions of Mallipo beach. In the whole area, the decreasing rate of average TPH (total petroleum hydrocarbon) in winter was twice greater than summer during four years. According to the spatial variation pattern analysis of oiling status using weighted mean center and weighted standard distance, the oil concentration was clustered on southwestern region in winter, however, the TPH was dispersed in the whole area in summer. Temporal variation pattern of TPH in each of Mallipo`s five regions showed that TPH had been consistently decreased in winter, but oil concentration had not been changed in summer since 2009 except the southwestern region. Therefore, in order to evaluate and predict the progress of oiling status, it is needed to analyze the spatio-temporal variation pattern of TPH using spatial analysis after separating data into seasons (e.g., winter and summer). In addition, time series analysis is useful in the regional scales through spatial partitioning rather than the whole beach area for the understanding of temporal variation pattern.
Overlay Rendering of Multiple Geo-Based Images Using WebGL Blending Technique
Kim, Kwang-Seob ; Lee, Ki-Won ;
Journal of the Korean Association of Geographic Information Studies, volume 15, issue 4, 2012, Pages 104~113
DOI : 10.11108/kagis.2012.15.4.104
Followed by that HTML5(Hypertext Markup Language5) was introduced, many kinds of program and services based on this have been developed and released. HTML5 is technical standard specifications for cross platform for personal computers and mobile devices so that it is expected that continuing progress and wide application in the both sides of the academic and the industrial fields increase. This study is to design and implement a mobile application program for overlay rendering with DEM and other geo-based image sets using HTML5 WebGL for 3D graphic processing on web environment. Particularly, the blending technique was used for overlay processing with multiple images. Among available WebGL frameworks, CubicVR.js was adopted, and various blending techniques were provided in the user interface for general users. For the actual application in the study area around the Sejong city, serveral types of geo-based data sets were used and processed: KOMPSAT-2 images, ALOS PALSAR SAR images, and grid data by environment measurements. While, DEM for 3D viewing with these geo-based images was produced using contour information of the digital map sets. This work demonstrates possibilities that new types of contents and service system using geo-based images can be extracted and applied.
Analysis of Geometric Shape and Displacement in Coastal Structure
Mun, Do-Yeoul ; Baek, Tae-Kyung ; Lee, Tack-Gon ; Lee, Sung-Su ;
Journal of the Korean Association of Geographic Information Studies, volume 15, issue 4, 2012, Pages 114~123
DOI : 10.11108/kagis.2012.15.4.114
This study is aimed to assess the stability of cable bridge by determining the geometric shape of the suspension bridge among the domestic coastal structures in public use after their completion of construction and the displacement of the target suspension bridge after public use. For this purpose, this study calculated the length between pylon piers for each period, sag, sag ratio and the displacement of pylon. Compared to the management standards for each step across different pylon behaviors of the target suspension bridge, this study found that the target suspension bridge behaves stably within the maintenance standards. To identify the behaviors of a suspension bridge accurately, the priority is put on the determination of geometric shape. Therefore, it is required to determine the surveyed shape model on a regular basis across public use period and increased traffics, which is expected to contribute considerably to ensuring the stability of the suspension bridge in its maintenance.
Nocturnal Surface Cooling and Cold Air Transport Analysis Based on High Density Observation - A Case Study of Eunpyeong New Town in Seoul
Yi, Chae-Yeon ; Kim, Kyu-Rang ; Choi, Young-Jean ; Won, Hye-Young ; Scherer, Dieter ;
Journal of the Korean Association of Geographic Information Studies, volume 15, issue 4, 2012, Pages 124~137
DOI : 10.11108/kagis.2012.15.4.124
Climate analysis is important in urban planning for human comfort. Synoptic weather conditions can only resolve the 30% of local variance of wind conditions whereas 70% of the variance arise from local terrain, buildings, and other small scale thermal conditions. Climate Analysis Seoul (CAS) was developed to resolve such micro-scale climate. The Local-scale air temperature Deviation (LD) analysis map from CAS showed the co-existence of built-up and suburban areas in the study region (CR, Cold-air analysis Region) despite its small extent. Temperature, humidity, wind speed, and wind direction were monitored in CR. Hourly observed cooling rate agreed well with LD. Cold air production, transportation, and stagnation was visualized by the observed Vertical Temperature Gradient (VTG) along the small stream in CR. VTG observed at the upper-most stream can be divided into two components: radiative cooling and cold air inflow from outside. Radiative cooling exists regardless of the wind speed whereas cold air inflow occurs only with calm wind. From the regression analyses based on the wind speed, the inflow portion was determined as 84% of radiative cooling. Climate analysis in the future will be able to characterize the changes in cold air by urban development plan to support the human comfort.
Regional Disparity of Ambulatory Health Care Utilization
Shin, Ho-Sung ; Lee, Sue-Hyung ;
Journal of the Korean Association of Geographic Information Studies, volume 15, issue 4, 2012, Pages 138~150
DOI : 10.11108/kagis.2012.15.4.138
The purpose of this study was to examine the regional disparity of ambulatory health care utilization considering spatio-temporal variation in South Korea during 1996-2008(precisely, in 1996, 1999, 2002, 2005, and 2008) using bayesian hierarchial spatio-temporal model. The spatial pattern uses an intrinsic gaussian conditional autoregressive (CAR) error component. Ornstein-Uhlenbeck method was applied to detect the temporal patterns. The results showed that substantial temporal-geographical variation depending on diseases exists in Korea. On the Contrary to the pattern of total outpatient utilizations, for example, the areas that chronic diseases distributed relatively high were most in rural where the proportion of elderly population was higher than in the urban. Chungcheongnam-do, Junlabuk-do, and Kyeongsangbuk-do had higher risks in hypertension, whereas arthritis was higher risk in the Kyeonggi-do, Chungcheongbuk-do, Junlanam-do, and Junlabuk-do. The results of this study suggested that the effective health intervention programmes needed to alleviate the regional variation of health care utilization. These outcomes also provided the foundation for further investigation of risk factors and interventions in these high-risk areas.
Building a Web-Based Undesignated Cultural Heritages Management Information System - A Case Study of the Namsan Area in Kyeongju -
Jo, Myung-Hee ; Jang, Sung-Hyun ; Kim, Hyoung-Sub ;
Journal of the Korean Association of Geographic Information Studies, volume 15, issue 4, 2012, Pages 151~161
DOI : 10.11108/kagis.2012.15.4.151
The purpose of this study was to build a web-server for culture heritages management information system in order to efficiently manage and safely preserve undesignated cultural properties in the Namsan area in Kyeongju, which have been neglected so far. In order to achieve this purpose, data were collected on the basis of undesignated cultural properties in the study area. To acquire the location and range GPS were used and spatial data including geographic coordinates, visual materials and structured interviews were conducted through field survey. In addition, in order to obtained reliable and accurate locations of undesignated cultural properties which are scattered, DGPS(Differential Global Positioning System) were used. The spatial database was constructed based on the standard of cultural properties and attribute data was linked to geo-spatial information(digital map and aerial photographs). This system was built in a web-server environment. The result shows detailed description on the selected output for selected location and property information can be located on the map. In particular, a database to search for the status and modification of cultural properties will provide information to the users.
Spatial Distribution Characteristics of Vertical Temperature Profile in the South Sea of Jeju, Korea
Yoon, Dong-Young ; Choi, Hyun-Woo ;
Journal of the Korean Association of Geographic Information Studies, volume 15, issue 4, 2012, Pages 162~174
DOI : 10.11108/kagis.2012.15.4.162
To visualize the characteristics of vertical seawater temperature data, in the ocean having 3D spatial characteristics, 2D thematic maps like horizontal seawater temperature distribution map at each depth layer and 3D volume model using 3D spatial interpolation are used. Although these methods are useful to understand oceanographic phenomena visually, there is a limit to analyze the spatial pattern of vertical temperature distribution or the relationship between vertical temperature characteristics and other oceanic factors (seawater chemistry, marine organism, climate change, etc). Therefore, this study aims to determine the spatial distribution characteristics of vertical temperature profiles in the South Sea of Jeju by quantifying the characteristics of vertical temperature profiles by using an algorithm that can extract the thermocline parameters, such as mixed layer depth, maximum temperature gradient and thermocline thickness. For this purpose spatial autocorrelation index (Moran`s I) was calculated including mapping of spatial distribution for three parameters representing the vertical temperature profiles. Also, after grouping study area as four regions by using cluster analysis with three parameters, the characteristics of vertical temperature profiles were defined for each region.