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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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The Korean Association of Geographic Information Studies
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Volume & Issues
Volume 11, Issue 4 - Dec 2008
Volume 11, Issue 3 - Sep 2008
Volume 11, Issue 2 - Jun 2008
Volume 11, Issue 1 - Mar 2008
Selecting the target year
The Spatial Characteristics of Transit-Poors in Urban Areas
Kim, Jae-Ik ; Kang, Seung-Kyu ; Kwon, Jin-Hwi ;
Journal of the Korean Association of Geographic Information Studies, volume 11, issue 2, 2008, Pages 1~12
This paper identifies public transit-poors and derives spatial characteristics of the poors' distribution in an urban area by utilizing buffering analysis of geographic information systems and remote sensing techniques in the case of Daegu metropolitan city. Since special attention is given to elderlies, this study assigns three hundred meter buffer from bus/subway station as service boundary for elderlies. The results of this study tell us that 1) the transit-poors are concentrated on suburban and rural regions, 2) high proportions of the transit poors are elderlies with spatial variations in many regions, 3) the main housing type of the transit-poors is single detached house. We expect that this study can contribute to build an effective policy-making by showing essential technical processes and methods in identifying policy-need groups and their characteristics of spatial distribution.
Zoning Suitability Analysis to Reduce First-flush Runoff Contamination in a Separated Sewer System
Park, In-Hyeok ; Ha, Sung-Ryong ;
Journal of the Korean Association of Geographic Information Studies, volume 11, issue 2, 2008, Pages 13~27
This paper aim to reorganize zoning areas for decreasing first-flush runoff contamination in a separated sewer system via suitability analysis, and to simulate the discharge pollution loads of first-flush runoff using SWMM. For these purposes, diffuse pollution, which is accumulated on a surface and first-flush runoff flow were investigated. Suitability conditions for zoning were defined using the results of these investigation and suitable zoning areas were analyzed for the each condition. AHP analysis was conducted to establish weights of the suitability conditions. The most suitable zoning areas were analyzed via overlaying weights and suitability conditions. From the result, it was noted that the most suitable zones for detached houses & apartments are location they already occupied. Some school areas analyzed were found to be suitable as commercial centers. Some zones within the area analyzed were found to be suitable for commercial zones. From results obtained from simulation, the zone re-organization showed BOD and SS concentration to reduce from 91.2% to 0.09% ans 72.74% to 0.31% respectively.
A Detection of Vegetation Variation Over North Korea using SPOT/VEGETATION NDVI
Yeom, Jong-Min ; Han, Kyung-Soo ; Lee, Chang-Suk ; Park, Youn-Young ; Kim, Young-Seup ;
Journal of the Korean Association of Geographic Information Studies, volume 11, issue 2, 2008, Pages 28~37
In this study, we perform land surface monitoring of NDVI (Normalized Difference Vegetation Index) variation by using remote sensing data during 1999-2005 over North Korea, which can't easily access to measure directly land surface characteristics due to one of the world's most closed societies. North Korea forest region has most abundant forest vegetation - so called Lungs of Korea in the Korea peninsula. NDVI represents vegetation activity used in many similar studies. In this study, we detect vegetation variation and analysis factors of the change over North Korea. By using variation of NDVI, we can infer that effect of drought over North Korea, and reduced vegetation indices by typhoon in North Korea. Land surface type except barren ground with decreased NDVI value is considered as when North Korea region was suffering from drought and typhoon effects, which show lower than mean of 7-year NDVI value. Especially, in recently, the food production of North Korea with political and economical issues can be inferred indirectly these trends by using estimated output data from this study.
Regional Estimation of Site-specific Seismic Responses at Gyeongju by Building GIS-based Geotechnical Information System
Sun, Chang-Guk ; Chung, Choon-Ki ;
Journal of the Korean Association of Geographic Information Studies, volume 11, issue 2, 2008, Pages 38~50
The site-specific seismic responses and corresponding seismic hazards are influenced mainly by the subsurface geologic and geotechnical dynamic characteristics. To estimate reliably the seismic responses in this study, a geotechnical information system (GTIS) within GIS framework was developed by introducing new concepts, which consist of the extended area containing the study area and the additional site visit for acquiring surface geo-knowledge data. The GIS-based GTIS was built for Gyeongju area, which has records of abundant historical seismic hazards reflecting the high potential of future earthquakes. At the study area, Gyeongju, intensive site investigations and pre-existing geotechnical data collections were performed and the site visits were additionally carried out for assessing geotechnical characteristics and shear wave velocity (
) representing dynamic property. Within the GTIS for Gyeongju area, the spatially distributed geotechnical layers and
in the entire study area were reliably predicted from the site investigation data using the geostatistical kriging method. Based on the spatial geotechnical layers and
predicted within the GTIS, a seismic zoning map on site period (
) from which the site-specific seismic responses according to the site effects can be estimated was created across the study area of Gyeongju. The spatial
map at Gyeongju indicated seismic vulnerability of two- to five-storied buildings. In this study, the seismic zonation based on
within the GIS-based GTIS was presented as regional efficient strategy for seismic hazard prediction and mitigation.
A Study on Present Condition and Adjustment of the Minmium Height Regulation District in Busan Metropolitan City
Lee, Dong-Hyun ; Baek, Tae-Kyung ;
Journal of the Korean Association of Geographic Information Studies, volume 11, issue 2, 2008, Pages 51~60
The Purpose of this study is to find the adjustment of the minimum height regulation district in Busan metropolitan city. For this purpose, data of buildings in the minimum height regulation district are collected and analysed. Especially, detailed data of buildings in CBD are analysed. The results of this study provide that CBD's average building height is the fourth floor and the ratio that a building less than the fourth floor holds in total building is 51%. In the case of central area, CBD's building height should be maintained and it is necessary to make the policy that reinforce limited height for the high land use and landscape management. Based on these findings this study suggests that the limit building height should put it up more than the seventh floor.
The Evaluation of Application to MODIS LAI (Leaf Area Index) Product
Ha, Rim ; Shin, Hyung-Jin ; Park, Geun-Ae ; Hong, Woo-Yong ; Kim, Seong-Jun ;
Journal of the Korean Association of Geographic Information Studies, volume 11, issue 2, 2008, Pages 61~72
Leaf area index (LAI) is a key biophysical variable influencing land surface processes such as photosynthesis, transpiration and energy balance, and is a required input to estimate evapotranspiration in various ecological and hydrological models. The development of more correct and useful LAIs estimation techniques is required by these importance, but LAIs had been assumed in most LAI research through simple relations with the normalized difference vegetation index (NDVI) because the field measurement is difficult on wide area. This paper is to evaluate the MODIS LAI Product's practical use by comparing with LAIs that is derived from NOAA AVHRR NDVIs and the 2 years (2003-2004) measured LAIs of Korea Forest Research Institute in Gyeongancheon watershed (561.12
). As a result, the MODIS LAIs of deciduous forests showed higher values about 14 % and 15~30 % than the measured LAIs and NOAA LAIs. In the year of 2003, the MODIS LAIs in coniferous forests were 5 % higher than the measured LAIs, and showed about 7 % differences comparing with the NOAA LAIs except April. These differences come from the insufficient field data measured in partial points of the target area, and the extracted reference data from MODIS LAIs include the limits of spatial resolution and the error of incorrect land cover classification. Thus, using the MODIS data by the proper correction with the measured data can be useful as an input data for ecological and hydrological models which offers the vegetation information and simulates the water balance of a given watershed.
Evaluation of Spatial Characteristic of Wind Corridor Formation in Daegu Area using Satellite Data
Jung, Eung-Ho ; Kim, Dae-Wuk ; Ryu, Ji-Won ; Cha, Jae-Gyu ; Son, Kyung-Su ;
Journal of the Korean Association of Geographic Information Studies, volume 11, issue 2, 2008, Pages 73~84
This study has conducted the survey Daegu area on the evaluation of the wind generation by the spatial geograph conditions and according to the elements that practically affecting the generation of the wind. Because the elements affecting the wind generation are very diverse and interrelated, it is very important to secure accurate fundamental datas. For getting these datas, by applying satellite images to the study, more accurate datas were collected and the result of study is summarized as follows First of all, it has been acknowledged that due to the Daegu,s geographic features, there are a lot of areas with high wind generation, but most of these areas have been distributed in the outskirts of the city, where as in the areas wind generation is relatively very low in the urbanized areas, which indicate that the spatial unbalance is very high. And what is more of wind generation in certain areas where places spatially connected to the urbane district, show very low wind generations, and its influenced range become limited. From this fact, it can be estimated that the effects of the wind corridor coming into the urban district will be reduced. And also through this study, it could be verified that there are ample possibility of applying the satellite data as a means of building up the spatial data for evaluation of formation of the wind corridor.
A Study on Evaluation Analysis of Wind Formation Function using KLAM_21 -The Case of Daegu City-
Ryu, Ji-Won ; Jung, Eung-Ho ; Kim, Dae-Wuk ; Cha, Jae-Gyu ; Son, Kyung-Su ;
Journal of the Korean Association of Geographic Information Studies, volume 11, issue 2, 2008, Pages 85~92
This study, the one concerning the evaluation analysis of the function of the wind generation using KLAM_21, has examined closely how the wind really flows on the space of the city, working with the object of case location. In the first place, the cold air formed at upper stream of Sincheon river, a ravine of whole area of Gachang gully and an inclined plane of neighboring mountainous district, flows to the north and expands itself along the upper stream of the Sincheon river, and as the time passes, it is tending upwards in the change of the volume and height as well as of the velocity and direction, of the cold air. It was learned that this phenomenon has made it clear that the spatial features of this area give rise to very good condition in generating and flowing the cold air. Meanwhile, it has been shown that in the area of park in the Ap-mountain, the generation and flow of the cold air are much interrupted because of the overpass traversing the whole area of the park of Ap-mountain, the congested area of large-scaled apartments and the urban development activities constructing the building in the park, and the volume and height of the cold air has been grown very small. In conclusion, It has been learned that for maximization of the spatial effect of the wind corridor, the areas where the cold air is generated, flowed, accumulated, and maintained, have to be connected spatially, and this spatial connection has a close relation with spatial features of the area.
Development of the GIS-based Stream Hydromorphological Structure Assessment System for Small and Midium-size Streams
Kim, Man-Kyu ; Kim, Hye-Ju ; Park, Jong-Chul ;
Journal of the Korean Association of Geographic Information Studies, volume 11, issue 2, 2008, Pages 93~107
Recently, there have been many projects regarding restoration of streams to recover their environmental and ecological functions. For the restoration of streams, it is valuable academically and economically to evaluate the ecological condition of streams and build a plan and an object for restoring streams based on that. On the other hand, one of the methods to figure out the ecological condition of streams is to evaluate the hydromorphological structure of stream. In this study we have developed a field survey system using the stream assessment methode of LAWA (Laenderarbeitsgemeinschaft Wasser in Germany) that can assess the hydromorphological structure of small and medium streams. In addition, we constructed a GIS-based stream assesment system which can support auto mapping system and report writing, using the survey results. These systems are aimed to help people in the area of restoring streams perceive the natural and ecological condition of streams in the process of making plans and managing the projects, and they also try to help in collecting raw data to determine an ideal potential model to which an existing stream should be turned.
Development of a Screening Method for Deforestation Area Prediction using Probability Model
Lee, Jung-Soo ;
Journal of the Korean Association of Geographic Information Studies, volume 11, issue 2, 2008, Pages 108~120
This paper discusses the prediction of deforestation areas using probability models from forest census database, Geographic information system (GIS) database and the land cover database. The land cover data was analyzed using remotely-sensed (RS) data of the Landsat TM data from 1989 to 2001. Over the analysis period of 12 years, the deforestation area was about 40ha. Most of the deforestation areas were attributable to road construction and residential development activities. About 80% of the deforestation areas for residential development were found within 100m of the road network. More than 20% of the deforestation areas for forest road construction were within 100m of the road network. Geographic factors and vegetation change detection (VCD) factors were used in probability models to construct deforestation occurrence map. We examined the size effect of area partition as training area and validation area for the probability models. The Bayes model provided a better deforestation prediction rate than that of the regression model.
Application of Simulation for Road Design Evaluation
Kim, Ga-Ya ; Jung, Beam-Seok ; Kim, Nam-Seok ;
Journal of the Korean Association of Geographic Information Studies, volume 11, issue 2, 2008, Pages 121~131
Two dimensional road design is connoting danger factor because different point between design standard and driver's reaction. Consequently two dimensional road design is difficult to recognize problem that happen beforehand when before construction. Therefore three dimensional road design that can grasp problem after completion is required. In this study, three dimensional road was designed to evaluate road that is designed. Road designed by Inroad that is road design program. DTM is created using digital map and elevation data. Three dimensional road was designed by integrated DTM of road and topography. Road design evaluation was performed in three dimension. Driving simulation and sight distance assessment were carried out to estimate stability of alignment. Shadow simulation was executed on icy road section for bad section of icy road surface. As a result of evaluation, this study could confirm shape of road after completion. And sight distance could be calculated and visually confirmed. Also, icy road sections were extracted through shadow simulation.
Development of U-Service Priority Model Based on Customer and Provider's View
Jang, Jae-Ho ; Um, Jung-Sup ;
Journal of the Korean Association of Geographic Information Studies, volume 11, issue 2, 2008, Pages 132~147
So far ubiquitous service (u-service) priority has seldom been empirically examined based on the customer's view. It is usual to prioritize the relative importance of u-service variables by the supplier's intuition and a few specialist's experienced knowledge. Such approaches have the disadvantage that they provide only limited empirical information on the field practices in relation to u-service since customer demand of u-service is poorly defined despite abundant interest in this problem. Therefore, the aim of this research was to develop u-service priority model in the context of multi-criteria framework integrating customer and supplier's view, using high technology acceptance theory as major controlling factors. An important question was how to measure or represent criteria that is important to u-service and should be included in a priority model. The selection criteria for the model variables were derived from high technology acceptance theory and AHP approach through the analysis of frequency count, elimination of overlapping factors and brainstorming with specialists. Daegu showed top-rankings in transportation-aid service, guidance service for the eyesight disabled and u-telematics service. In contrast, disaster prevention service and industrial specialized town service ranked highly in the typical supplier's approach were not a dominant determining factor in the u-service priority. The model identified the fact that typical high priority service in terms of supplier's view did not necessarily accompany the important predictor for the u-service priority.