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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Korean Society for Geospatial Information System
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Journal DOI :
The Korean Society for Geospatial Information System
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Volume & Issues
Volume 19, Issue 4 - Dec 2011
Volume 19, Issue 3 - Sep 2011
Volume 19, Issue 2 - Jun 2011
Volume 19, Issue 1 - Mar 2011
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Spatio-Temporal Trends in Temperature, Acidification and Dissolved Oxygen in Lower Mekong Basin for 1985-2005
Ratanavong, Nilapha ; Lim, Sam-Sung ; Lee, Hyung-Seok ;
Journal of Korean Society for Geospatial Information System, volume 19, issue 4, 2011, Pages 3~12
Understanding of water sediment trends is an important part of water quality monitoring. Water quality variables change over time and space, and cannot be modeled or explained clearly by either temporal or spatial analysis alone. This research analysed the trends of temperature, pH levels and dissolved oxygen levels based on the sediment records and spatial data obtained in Lower Mekong Basin (LMB) during 1985-2005. Our aim is to evaluate spatio-temporal trends and graphical analyses using an Inverse Distance Weighting (IDW) interpolation method. The main results from this research can be summarized as follows. The maximum temperature and pH have been stable during the study period and the maximum dissolved oxygen has been increasing gradually until 2002. The minimum pH and dissolved oxygen have been changing in an unsteady trend during the period. A spatial analysis shows that the water temperature in this region has been increasing over time. The pH trend shows that it is decreasing during 1993-2005. Dissolved oxygen concentration has been increasing from 1989 onwards and stays in that track.
A Study on Atmospheric Environment Visualization by Integrating 3D City Model and CFD Model
An, Seung-Man ; Lee, Ho-Yeong ; Sung, Hyo-Hyun ; Choi, Yeong-Jin ; Woo, Jung-Hun ;
Journal of Korean Society for Geospatial Information System, volume 19, issue 4, 2011, Pages 13~21
The purpose of this study is enhancing CFD model by applying detailed and accurate CFD input data produced from 3D City model and integrating CFD model with 3D city model with OpenGL, 3D city aerodynamic simulation, and visualization tool. CFD_NIMR_SNU model developed by NIMR and SNU and 3D City model produced by NGII were used as input data. Wind flow and pollution diffusion simulator and viewer were developed in this study. Atmospheric environment simulation and visualization tool will save time and cost for urban climate planning and management by enhancing visual communication.
The Analysis of Chloride Ion of Ground Water in the West Coast District of Jeollabuk-Do using Spatial Interpolation
Lee, Geun-Sang ; Im, Dong-Gil ; Choi, Yun-Woong ; Cho, Gi-Sung ;
Journal of Korean Society for Geospatial Information System, volume 19, issue 4, 2011, Pages 23~33
In this study, the data that examined the chloride ion concentration of ground water wells in the west coast of Jeollabukdo applying the GIS spatial estimation method were analyzed. In particular, through the designation of a validation point among ground water wells and then the analysis of error characteristics of the chloride ion concentration by each method of IDW (Inverse Distance Weight), Spline, and Kriging Interpolation method which is proper for estimating salt water intrusion was selected. The main conclusion from this study is as follows. First, as a result of analyzing the error characteristics of various spatial estimation methods by using the data from the chloride ion concentration of 485 ground water wells, the IDW method was found to be the most appropriate for estimating chloride ion concentration by salt water intrusion. Second, analyzing the average chloride ion concentration of the targeted regions has revealed that Gunsan-si with the record of
did not meet water quality standards even for industrial use. Both Gimje-si and Gochang-gun satisfied drinking water quality standards and Buan-gun with
was slightly below the standards for drinking water. Third, concerning the results of analysis according to administrative districts, as the areas adjacent to the west coast such as Daemyeong-dong, Joong-dong, Jangjae-dong and Guemam-dong in Gunsan-si are found to have very high chloride ion concentration, and both Hoehyeon-myeon and Daeya-myeon bounded by the Mankeong river did not meet water quality standards even for industrial use. From these facts, it is concluded that salt water intrusion has a great effect on Gunsan-si generally.
A Study on Climate Change KML Contents Publishing by using Meteorological Model
An, Seung-Man ; Choi, Yeong-Jin ; Eum, Jung-Hee ; Jeon, Sang-Hee ; Sung, Hyo-Hyun ;
Journal of Korean Society for Geospatial Information System, volume 19, issue 4, 2011, Pages 35~45
The purpose of this study is visualizing climate change contents from Weather Research and Forecasting model and providing useful tool to anyone who want to use them for communication and actual movement. As a results, we have built a process and user interface for publishing Arrow KML, BWS KML, and DI KML. Arrow KML provide wind rose service and wind attribute information for each arrow. BWS KML provide a wind power index and DI KML provide a thermal comfort. All KML contents are more reliable because those are visualized from the scientifically verified climate change prediction model. Further study will focus on searching for climate change contents mining and useful contents design for wide range of climate change mitigation/adaptation activity.
Development of Disaster Prevention Information System using Disaster Prevention Map Based on Digital Image
Park, Joon-Kyu ;
Journal of Korean Society for Geospatial Information System, volume 19, issue 4, 2011, Pages 47~53
As global warming and has caused the number of abnormal changes, much damage has occurred recently in Korean Peninsula from natural disaster. To prevent and cope with these annually repeated natural hazards, scientific analysis are needed in Disaster Management, including systematic management. In this study, As part of scientific disaster prevention measures, digital image based hazard map for solution to overcome the existing hazard map with schematic representation was constructed. which was combined digital image, digital map and hazard information, and than hazard information system was developed using the hazard map. The hazard information map and hazard information system are able to provide great service to the public and to support quick decision making for hazard management and analysis of natural hazard damage.
Distortion Correction of Boundary Lines in a Tunnel Image Captured by Fisheye Lens
Kim, Gi-Hong ; Jeong, Soo ;
Journal of Korean Society for Geospatial Information System, volume 19, issue 4, 2011, Pages 55~63
Having a wide angle of view, a fisheye lens is useful for obtaining images of the inside wall of a tunnel. A circular fisheye tunnel image can be transformed into a familiar rectangular image by applying the concept of cylindrical projection. This projection transformation causes several types of distortions in the projected image. This paper discusses the distortion on the boundary lines between smoothly curved wall and flat ground. We analyzed the cause of this boundary distortion, developed transformation model, and derived a correction formular. A distortion correction software programmed in Visual C++ applied to projected image. Consequently, boundary-corrected image could be obtained. Research into other distortions of projected image will helpful in obtaining tunnel image that resembles real tunnel from fisheye tunnel image.
Accuracy Analysis of Cadastral Supplementary Control Points by Using Virtual Reference Station-Real Time Kinematic GPS Surveying - Focused on Geoje City -
Choi, Woo-Seok ; Yoo, Hwan-Hee ;
Journal of Korean Society for Geospatial Information System, volume 19, issue 4, 2011, Pages 65~70
National Geographic Information Institute provides VRS service using permanent GPS networks. VRS-RTK(Virtual Reference System-Real Time Kinematic)GPS surveying which enable to accomplish the real time-based GPS surveying has been increasingly popular. However the positioning accuracy tends to deteriorate as the distance between the rover and base station increases in the VRS-RTK GPS surveying. To analysis this problem in this study, the accuracy of VRS-RTK data was analyzed with 2 different test sites of Geoje city, Gyeongnam province within and without the permanent GPS networks in order to accomplish the cadastral supplementary control surveying. As a result of surveying accuracy analysis at two test sites, positioning errors were
(RMSE) in both sites. The result was that within the tolerance specified in cadastral surveying law, and indicated the possibility of VRS-RTK GPS surveying in cadastral surveying.
Flood Damage Assessment According to the Scenarios Coupled with GIS Data
Lee, Geun-Sang ; Park, Jin-Hyeg ;
Journal of Korean Society for Geospatial Information System, volume 19, issue 4, 2011, Pages 71~80
A simple and an improved methods for the assessment of flood damage were used in previous studies, and the Multi-Dimensional Flood Damage Assessment (MD-FDA) has been applied since 2004 in Korea. This study evaluated flood damage of dam downstream using considering MD-FDA method based on GIS data. Firstly, flood water level with FLDWAV (Flood Wave routing) model was input into cross section layer based on enforcement drainage algorithm, water depth grid data were created through spatial calculation with DEM data. The value of asset of building and agricultural land according to local government was evaluated using building layer from digital map and agricultural land map from landcover map. Also, itemized flood damage was calculated by unit price to building shape, evaluated value of housewares to urban type, unit cost to crop, tangible and inventory asset of company connected with building, agricultural land, flooding depth layer. Flood damage in rainfall frequency of 200 year showed 1.19, 1.30 and 1.96 times to flood damage in rainfall frequency of 100 year, 50 year and 10 year respectively by flood damage analysis.
GIS based Estimation of Carbon Emission for a Local Government Unit
Kim, Tae-Hoon ;
Journal of Korean Society for Geospatial Information System, volume 19, issue 4, 2011, Pages 81~89
Low-carbon Green Growth is highlighted as the main issue from in and outof Korea. Recently Korean government and local goverment constructed a master plan and related database. Considering this as a starting point the carbon gross emission has become an important factor in the city planning and management of local goverment unit. This research was focused on the analysis of carbon gross emission and the environment of carbon occurrence using statistics and digital forest map for the Gyeonggi-do. Further research need to analysis the carbon absorption using satellite image for periodic database. These database will be available basic data for the policy making.
Accuracy Improvement for Building Inundation Trace Map using Accurate DEM Data and Flood Damage Information
Goo, Sin-Hoi ; Kim, Seong-Sam ; Park, Young-Jin ; Choi, Jae-Won ;
Journal of Korean Society for Geospatial Information System, volume 19, issue 4, 2011, Pages 91~99
With increasing astronomically damage costs caused by frequent and large-sized flood, a hazard map containing comprehensive analysis results such as inundation trace investigation, flood possibility analysis, and evacuation plan establishment for flooded regions is a fundamental measure of non-structural flood prevention. Though an inundation trace map containing flood investigation results occurred by typhoon, rainfall and tsunami is a basic hazard map having close relationship with a flood possibility map as well as a hazard information map, it is often impossible to be produced because of financial deficiency, time delay of investigation, and the lack of maintenance for flood traces. Therefore, this study proposes the accuracy enhancement procedure of inundation trace map with flood damage information and three-dimensional Digital Elevation Model (DEM) for the past frequent flooded regions according to a guideline for inundation trace map of National Emergency Management Agency (NEMA).
Generation of Topographic Map Using GeoEye-1 Satellite Imagery for Construction of the Jangbogo Antarctic Station
Kim, Eui-Myoung ; Hong, Chang-Hee ;
Journal of Korean Society for Geospatial Information System, volume 19, issue 4, 2011, Pages 101~108
Construction of the Jangbogo antarctic station was planned, and it requires detailed information on topography of the area around the station. The purpose of this research is to generate the topographic map to construct the Jangbogo antarctic station using the satellite image. To do this, surveying and pre-test of equipment were conducted. In addition, for sensor modeling of the GeoEye-1 satellite image, RPC-bias correction was done, and it showed that at least two control points are required. In generating the map, a 1/2,500 scale was deemed suitable in consideration of resolution of the image and the fact that supplementary topographic surveying would be impossible. In order to provide detailed information on the topography around the Jangbogo station, the digital elevation model based on image matching was created, and compared with GPS-RTK data, accuracy of vertical location about 0.6m was exhibited.
An Filtering Automatic Technique of LiDAR Data by Multiple Linear Regression Analysis
Choi, Seung-Pil ; Cho, Ji-Hyun ; Kim, Jun-Seong ;
Journal of Korean Society for Geospatial Information System, volume 19, issue 4, 2011, Pages 109~118
In this research estimated accuracies that were results in all the area of filtering of the plane equation that was used by whole data set, and regional of filtering that was driven by the plane equation for each vertual Grid. All of this estimates were based by all the area of filtering that deduced the plane equation by multiple linear regression analysis that was used by ground data set. Therefore, accuracy of all the area of filtering that used whole data set has been dropped about 2~3% when average of accuracy of all the area of filtering was based on ground data set while accuracy of Regional of filtering dropped 2~4% when based on virtual Grid. Moreover, as virtual Grid which was set 3~4 cm was difference about 2% of accuracy from standard data. Thus, it leads conclusion of set 3~4 times bigger size in virtual Grid filtering over LiDAR scan gap will be more appropriated. Hence, the result of this research allow us to conclude that there was difference in average accuracy has been noticed when we applied each different approaches, I strongly suggest that it need to research more about real topography for further filtering accuracy.
Availability Evaluation of Quasi Static RTK Positioning for Construction of High Rise Buildings and Civil Structures
Kim, In-Seop ;
Journal of Korean Society for Geospatial Information System, volume 19, issue 4, 2011, Pages 119~126
During precise survey on the top of High rise buildings and civil structures, optical surveying equipments like a Total Station are not recommended to use because of some reasons that uneasier alignment with reflectors located at the top of building, increasing error depends on increasement of observation distance and unavailable dynamic positioning etc. Recently various GPS positioning methods have been applied to this job however almost of them are post-processing method which is required much longer time during for whole process includes stake-out, cross checking, fixing positions and final inspections. Therefore, in this study, we applied with RTK surveying system which allows stake-out and inspection in realtime to avoid delaying of construction schedule and also applied with Quasi Static RTK measurement and network adjustment to get a high accuracy within a few millimeters in structure positioning to achieve a successful management for process and quality control of the project. As a result, very high accurate surveying for structures within approx. 2mm in realtime has been achieved when surveyor conduct a network adjustment using least square method for 4 base lines created by Quasi Static RTK data and we expect this method will be applied to construction survey for high rise buildings and civil structures in the future.
An Analysis on the Results of Cadastral Coordinate Computation of Urban Control Point for Connection to Cadastral Control Point -A Case Study of Changwon-si of Kyungnam-
Hong, Sung-Eon ;
Journal of Korean Society for Geospatial Information System, volume 19, issue 4, 2011, Pages 127~138
This study aimed at suggesting the possibility of an application that connects cadastral control point and urban control point. In order to do this, we calculated and analyzed the cadastral coordinate on urban control point by using the GPS observation data of Changwon-si urban control point (32 points) which was announced based on the result of global coordinate system. We calculated cadastral coordinate through using three different kinds of calculation S/Ws, and compared the results of the calculation with the preexisting result of urban control point. The comparison suggested that the gap between the new results and the existing results is in the range of error specified by a law. Therefore, the result can be used in cadastral surveying. However, for the safe application in practical works, we suggested that it would be better to carry out new cadastral surveying and use its result than to use the result of the current urban control point directly in surveying cadastral. In addition, we suggested that it is necessary to examine precisely the local station of triangulation. Finally, we recommended that one should use trilateral network adjustment S/W as one's calculation S/W.
Classification of Terrestrial LiDAR Data Using Factor and Cluster Analysis
Choi, Seung-Pil ; Cho, Ji-Hyun ; Kim, Yeol ; Kim, Jun-Seong ;
Journal of Korean Society for Geospatial Information System, volume 19, issue 4, 2011, Pages 139~144
This study proposed a classification method of LIDAR data by using simultaneously the color information (R, G, B) and reflection intensity information (I) obtained from terrestrial LIDAR and by analyzing the association between these data through the use of statistical classification methods. To this end, first, the factors that maximize variance were calculated using the variables, R, G, B, and I, whereby the factor matrix between the principal factor and each variable was calculated. However, although the factor matrix shows basic data by reducing them, it is difficult to know clearly which variables become highly associated by which factors; therefore, Varimax method from orthogonal rotation was used to obtain the factor matrix and then the factor scores were calculated. And, by using a non-hierarchical clustering method, K-mean method, a cluster analysis was performed on the factor scores obtained via K-mean method as factor analysis, and afterwards the classification accuracy of the terrestrial LiDAR data was evaluated.
Estimation of Actual Evapotranspiration using Multi-Satellite Data over Korea Peninsula
Lee, Min-Ji ; Han, Kyung-Soo ; Kim, In-Hwan ;
Journal of Korean Society for Geospatial Information System, volume 19, issue 4, 2011, Pages 145~151
Evapotranspiration (ET) is an important process acrossa wide range of disciplines, including ecology, hydrology and meteorology.In this study, daily actual evapotranspiration (ETa) is based energy balance equation and considering high surface roughness length to estimate. This study was used variety of satellite data and ground observation data in Korea Peninsula from 1 January to 31 December 2009. In this study, sensible heat flux is one of the important parameters of ETa. Measurements of sensible heat flux are, however, complex and can't be easily obtained. So this study was used an empirical coefficient B to simplify estimate of sensible heat flux. The coefficient B in the ETa model requires a careful definition of aerodynamic resistance. So this study proposed ETa model considering aerodynamic resistance and high surface roughness length. This study was conducted validation in comparison of the proposed daily ETa results with Priestley-Taylor ETp.
The Trend Analysis of Vegetation Change Applied to Unsupervised Classification Over East Asia: Using the NDVI 10-day data in 1999~2010
Kim, Sang-Il ; Han, Kyung-Soo ; Pi, Kyoung-Jin ;
Journal of Korean Society for Geospatial Information System, volume 19, issue 4, 2011, Pages 153~159
Vegetative land cover is an important variable many Earth system process, general circulation and carbon exchange model requires vegetative cover as boundary layer necessary to run model. The purpose of this study is to detect and to understand land surface change. To monitor changes of East Asia vegetation, we used NDVI 10-day MVC data derived from SPOT VEGETATION during 12 years from 1999 to 2010. Finally, according to the land cover of classified class, we performed analysis for dynamic zone(positive change zone and negative change zone), static zone in 1999, 2010. Therefore, land covers corresponding to each class have appeared change by 2010. Land cover change was confirmed by analyzing data during 12 years which appeared vegetation change of surrounding the actual desert area to east.