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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Korean Society for Geospatial Information System
Journal Basic Information
Journal DOI :
The Korean Society for Geospatial Information System
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Volume & Issues
Volume 15, Issue 4 - Dec 2007
Volume 15, Issue 3 - Sep 2007
Volume 15, Issue 2 - Jun 2007
Volume 15, Issue 1 - Mar 2007
Selecting the target year
Comparative Analysis of Terrain Slope Using Digital Map, LiDAR Data
Kang, Joon-Mook ; Yoon, Hee-Cheon ; Min, Kwan-Sik ; Rhee, Won-Yong ;
Journal of Korean Society for Geospatial Information System, volume 15, issue 4, 2007, Pages 3~9
Recently, the efforts of systematic understanding and utilization of geographic phenomenon for human life as a important factor among activity of mankind are increasing. It is necessary to express topography connected with space. Especially, the technology of geographic analysis using DEM can supply the information rapidly and accurately about elevation and terrain slope of the subject area under the necessity of high 3D quality geographic information. In this study, creating more precise DEM derived from LiDAR data, quantitative analysis on the subject area about elevation and terrain slope is done under comparison with Digital Topographic map Scale 1:1000. LiDAR data is more detailed than Digital Topographic map to express the elevation of the subject area (
), and terrain slope by analysis using DEM derived from LiDAR data come out minutely about 90%. It can be concluded that the LiDAR data is very applicable and accurate for 3D topographic terrain slope analysis.
An Evaluation of Landslide Probability by Maximum Continuous Rainfall in Gangwon, Korea
Yang, In-Tae ; Park, Jae-Kook ; Jeon, Woo-Hyun ; Chun, Ki-Sun ;
Journal of Korean Society for Geospatial Information System, volume 15, issue 4, 2007, Pages 11~20
Most natural disasters in Korea are caused by meteorological natural phenomena, which include storms, heavy rains, heavy snow, hail, tidal waves, and earthquakes. Rainfall is the most frequent cause of disasters and accounts for about 80% of all disasters. Particularly in recent years, Korea has seen annual occurrences of natural disasters associated with landslides (slope and retaining wall collapse and burying) due to meteorological causes from the increasing intensity of heavy rains including local heavy rainfalls. In Korea, it is critical to analyze the characteristics of landslides according to rainfall characteristics and to take necessary and proper measures for them. This study assessed the possibility of landslides in the Gangwon region with a geographic information system by taking into account the inducer factors of landslides and the maximum continuous rainfall of each area. It also analyzed areas susceptible to landslides and checked the distribution of landslide-prone areas by considering the rainfall characteristics of those areas.
Advancing National Geographic Information Clearinghouse to Extend Functionality and to Improve Usability
Shin, Dong-Bin ; Kim, Dong-Han ; Park, Si-Young ; Ahn, Jong-Wook ;
Journal of Korean Society for Geospatial Information System, volume 15, issue 4, 2007, Pages 21~29
The National Geographic Information Clearinghouse (NGIC) in Korea has been established to share dispersed geographic information in many government organizations. The NGIC has become a main hub for sharing and exchanging geographic information in Korea. However, due to rapid technological advancement, citizens not only require more information but also demand more functions for NGIC. In this regards, this research tries to find the way of developing NGIC from a means of 'information sharing' to an arena of 'information use'. To do so, it suggests new technical frameworks and functionalities for NGIC. Then it recommend policy measures to improve current NGIC.
Updating Building Layer of Digital Map Using Airborne Digital Camera Image
Hwang, Won-Soon ; Kim, Kam-Rae ;
Journal of Korean Society for Geospatial Information System, volume 15, issue 4, 2007, Pages 31~39
As the availability of images from airborne digital camera with high resolution is expanded, a lot of concern are shown about the production of orthoimage and digital map. This study presents the method of updating digital map using orthoimage from airborne digital camera image. Images were georectified using GPS surveying data. For the generation of orthoimage, Lidar DEM was used. The absolute positional accuracy of orthoimage was evaluated using GPS surveying data. And that of the building layer of digital map was estimated using the existed digital map at the scale of 1:1,000. The absolute positional accuracy of orthoimage was as followed: RMSE in X and Y were
. The RMSE of the building layer were
in X and Y directions, respectively. The RMSE of the digital map using orthoimage from Aerial Digital Camera image fell within allowable error range established by NGII. Consequently, updating digital map using orthoimage from Aerial Digital Camera image can be applied to various fields including the construction of the framework data and the GIS of local government.
A Study on Application of Global Positioning System for Cadastral Surveying
Yim, Hyon-Cheol ;
Journal of Korean Society for Geospatial Information System, volume 15, issue 4, 2007, Pages 41~50
This study aims to suggest efficient setting up of GPS (Global Positioning System) for cadastral surveying. In order to perform it effectively, worldly used modern surveying technology GPS introduced. In a practical analysis, GPS observation had been performed in the research area and the results had been compared and analysed with the results of Total Station. As a results, it is shown that GPS is more efficient rather than current surveying method in terms of time, cost and economy. The results of GPS surveying were included in the scope of error tolerance, being accepted by cadastral laws, showing high accuracy of GPS surveying method. With the results of analysis, how to application of GPS for cadastral surveying was suggested.
Forest Cover Change Detection Analysis in the Eastern Ghats of Tamil Nadu, India - a Remote Sensing and GIS Approach
Jayakumar, S. ; Ramachandran, A. ; Bhaskaran, G. ; Lee, Jung-Bin ;
Journal of Korean Society for Geospatial Information System, volume 15, issue 4, 2007, Pages 51~58
Information on forest type and cover density status of the present and past on large scale (1:50,000) is very much needed for conservation of any forest region. Such large-scale maps are not available for the Eastern Ghats (EG) of Tamil Nadu. This study deals with the preparation of forest type and cover density map of EG of Tamil Nadu during 2003 and the changes it has undergone between 1990 and 2003 using appropriate satellite data. About 10 forest types have been identified and mapped. Major changes have been observed in the forest types such as evergreen, and deciduous.
Development of Cutting Slope Management System Using PDA
Kim, Jae-Cheol ; Park, Jae-Kook ; Yang, In-Tae ;
Journal of Korean Society for Geospatial Information System, volume 15, issue 4, 2007, Pages 59~69
The scale of a natural disaster grows bigger and bigger every year. The government spends much of its budget on recovering the resulting damage on a national scale. It is important to shift the paradigm from taking measures after a disaster to that of taking preventive actions before a disaster in order to bring a fundamental resolution to such problems. In taking preventive actions and policies, it is necessary to integrate various kinds of advanced technologies including IT, high-tech information gathering technology and operational technology, and to predict and evaluate natural disasters on a comprehensive level. Although Korea is a country with a strong IT sector, most information gathering is still performed in paper. In particular, information about the areas of previous landslide occurrences and slopes remains on paper, which makes it difficult to share the information and to discern the contents, and also raises the possibility of missing documents. Thus this study set out to develop an information gathering and management system for cutting slopes using PDA from the perspective of information gathering, system compatibility, and information management. As a result, field information may be gathered in a variety of forms (location, photos, and texts) real-time. A rough judgment was also made of the stability of rock slopes using the SMR method on the field.
An Experimental Study on the Applied Method for Land Suitability Assessment
Kim, Woo-Hyeok ; Hwang, Eui-Jin ; Ryu, Ji-Hyub ;
Journal of Korean Society for Geospatial Information System, volume 15, issue 4, 2007, Pages 71~79
Land suitability assessment has been enforced by the National Land Planning and Utilization Act since 2003 to prevent urban sprawl and protect natural environment. It assesses developmental, agricultural or preservable suitability of land parcel according to such criteria as soil, location and usability by local governments. Land suitability assessment system (LSAS) has been introduced to prevent cursory development by urban sprawl and to lead a harmonious development with conservation in the non-urban area. However, with the lack of experience and knowledge various problems have been arisen in the operation of this system, raising a question for the improvement of the assessment unit of land. The purpose of this study is to investigate methods of developing land assessment as a sustainable land use management tool. In this study, land suitability assessment has been executed through geographic information systems. On the basis oh the results of analysis, practical and institutional problems are described, and technical and institutional solutions are suggested.
Epipolar Resampling for High Resolution Satellite Imagery Based on Parallel Projection
Noh, Myoung-Jong ; Cho, Woo-Sug ; Chang, Hwi-Jeong ; Jeong, Ji-Yeon ;
Journal of Korean Society for Geospatial Information System, volume 15, issue 4, 2007, Pages 81~88
The geometry of satellite image captured by linear CCD sensor is different from that of frame camera image. The fact that the exterior orientation parameters for satellite image with linear CCD sensor varies from scan line by scan line, causes the difference of image geometry between frame and linear CCD sensor. Therefore, we need the epipolar geometry for linear CCD image which differs from that of frame camera image. In this paper, we proposed a method of resampling linear CCD satellite image in epipolar geometry under the assumption that image is not formed in perspective projection but in parallel projection, and the sensor model is a 2D affine sensor model based on parallel projection. For the experiment, IKONOS stereo images, which are high resolution linear CCD images, were used and tested. As results, the spatial accuracy of 2D affine sensor model is investigated and the accuracy of epipolar resampled image with RFM was presented.
The Efficiency Evaluation of One Person Non-Prism Surveying System for Tunnel Measurement
Park, Kyeong-Sik ; Hahm, Chang-Hahk ; Lee, Jae-Kee ;
Journal of Korean Society for Geospatial Information System, volume 15, issue 4, 2007, Pages 89~96
The tunnel measurement data such as deficiency quantity, outbreak quantity, inner displacement and crown settlement are very important elements in tunnel sites under construction and obtained mostly by displacement gauge and total station. However, it is difficult and dangerous to install targets or measurement equipments on the points in tunnel construction site and also we need several persons to work in the tunnel. Non-prism total station with remote control system which is developed recently has various efficient functions for tunnel measurement. Therefore, for efficient tunnel measurement, this study suggested one person surveying system which consisted of non-prism total station and notebook PC to control total station remotely, and we evaluated the suggested tunnel measurement system. In this study, the tunnel site under construction was chosen as the test field and tunnel surveying was done by existing surveying method and suggested method separately. As result of the test, we analyzed processing time and accuracy to demonstrate the superiority of suggested one person non-prism surveying system.
Production of Flood Expectation Map in the Reclaimed Land Using 3-D Spatial Information
Lee, Jae-One ;
Journal of Korean Society for Geospatial Information System, volume 15, issue 4, 2007, Pages 97~102
Recently, coastal damage according to the natural disaster like storm-surge, overflowing of the sea has been massively increased. In case of earth fill at the seaside, there are a lot of weak areas of the natural disaster and it has also high possibility that a large disaster happens. Thus flood expectation map in the reclaimed land using 3D spatial information was produced in this study. The area around Myungji, Kangsugu, Busan which was made with the large scale earth fils at the seaside was designated as a study area. Observation of both costal datum and ground height using the tidal date and field surveying dates was conducted. Terrain model using the GIS program was produced and than 3D building model was produced using 3D MAX. It was shown that there are possibility more than 50% if over 4.5m storm-surge is happening, as a result of calculating the virtual flooded area on the produced cartographic map.
Application Possibility of Control Points Extracted from Ortho Images and DTED Level 2 for High Resolution Satellite Sensor Modeling
Lee, Tae-Yoon ; Kim, Tae-Jung ; Park, Wan-Yong ;
Journal of Korean Society for Geospatial Information System, volume 15, issue 4, 2007, Pages 103~109
Ortho images and Digital Elevation Model (DEM) have been applied in various fields. It is necessary to acquire Ground Control Points (GCPs) for processing high resolution satellite images. However surveying GCPs require many time and expense. This study was performed to investigate whether GCPs automatically extracted from ortho images and DTED Level 2 can be applied to sensor modeling for high resolution satellite images. We analyzed the performance of the sensor model established by GCPs extracted automatically. We acquired GCPs by matching satellite image against ortho images. We included the height acquired from DTED Level 2 data in these GCPs. The spatial resolution of the DTED Level 2 data is about 30m. Absolution accuracy of this data is below 18m above MSL. The spatial resolution of ortho image is 1m. We established sensor model from IKONOS images using GCPs extracted automatically and generated DEMs from the images. The accuracy of sensor modeling is about
pixel. We also established sensor models using GCPs acquired based on GPS surveying and generated DEMs. Two DEMs were similar. The RMSE of height from the DEM by automatic GCPs and DTED Level 2 is about 9 m. So we think that GCPs by DTED Level 2 and ortho image can use for IKONOS sensor modeling.
Accuracy Analysis of Sounding Data Caused by Speed of Robot-ship
Choi, Byoung-Gil ; Park, Hong-Gi ; Cho, Kwang-Hee ;
Journal of Korean Society for Geospatial Information System, volume 15, issue 4, 2007, Pages 111~116
This study is aimed to analyze the accuracy of depth information of reservoir using the robot-ship equipped with GPS and echosounder. The accuracy of depth measurements by sounding data was analyzed according to change of robot-ship's speed in the water. The field experiment results showed that as robot-ship's speeds were slow, accuracy of sounding data were increased. Until Robot-ship's speed was up to 5 km/hr, the accuracy of sounding data were included reliable section of normal distribution.