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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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The Korean Society for Geospatial Information System
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Volume & Issues
Volume 20, Issue 4 - Dec 2012
Volume 20, Issue 3 - Sep 2012
Volume 20, Issue 2 - Jun 2012
Volume 20, Issue 1 - Mar 2012
Selecting the target year
A Study for Removing Road Shields from Mobile Mapping System of the Laser Data using RTF Filtering Techniques
Song, Hyun-Kun ; Kang, Byoung-Ju ; Lee, Sung-Hun ; Choi, Yun-Soo ;
Journal of Korean Society for Geospatial Information System, volume 20, issue 1, 2012, Pages 3~12
DOI : 10.7319/kogsis.2012.20.1.003
It is a global trend to give attention to generating precise 3D navigation maps since eco-friendly vehicles have become a critical issue due to environmental protection and depletion of fossil fuels. To date, Mobile Mapping System (MMS) has been a efficient method to acquire the data for generating the 3D navigation maps. To achieve this goal so far in the Mobile Mapping System using the data acquisition method has been proposed to be most effective. For this study the basic RTF filter algorithm was applied to modify to fit MMS quantitative analysis derived floor 99.71%, 99.95% of the highly non-producers to maintain accuracy and high-precision 3D road could create DEM. In addition, the roads that exist within the cars, roadside tree, road cars, such as the median strips have been removed to shields it takes to get results effectively, and effective in practical applications and can be expected to improve operational efficiency is considered.
The Effect of The Channel Networks Resolution According to Strahler's Ordering Scheme on The Hydrological Response Function
Choi, Yong-Joon ; Ahn, Jung-Min ; Kim, Joo-Cheol ;
Journal of Korean Society for Geospatial Information System, volume 20, issue 1, 2012, Pages 13~20
DOI : 10.7319/kogsis.2012.20.1.013
In this study, the change pattern of hydrological response function as development has been observed. The target watershed was selected Tanbu sub-Basin in the Bocheong Basin. The applied channel networks are composed of 10 cases that are channel networks by strahler's ordering scheme and cases of all grids channel or the hillslope in basin. To each case of grid in basin, channel and hillslope drainage path lengths to outlet of basin are calculated, and hydrological response function was calculated by Nash Model. As results of this analysis, the peak discharge of hydrological response function is increased and peak time is shortened as development of channel networks. And based on statistical characteristics of hydrological response function, mean (lag time) and variance of travel time are reduced exponentially.
Development of a Spatio-Temporal DSMS for the Real-time Management of Moving Objects Data Stream
Shin, In-Su ; Kim, Jang-Woo ; Kim, Joung-Joon ; Han, Ki-Joon ;
Journal of Korean Society for Geospatial Information System, volume 20, issue 1, 2012, Pages 21~31
DOI : 10.7319/kogsis.2012.20.1.021
Recently, according to the development of ubiquitous computing technology, the efficient management of locations of moving objects is increasing rapidly in various fields. However, MODBMS and DSMS can not support the efficient real-time management of spatio-temporal stream data of moving objects. Therefore, this paper designed and implemented a spatio-temporal DSMS which can support the efficient real-time management of spatio-temporal stream data of moving objects. Especially, to develop the spatio-temporal DSMS, we extended STREAM of Stanford University and used GEOS that supports spatial data types and spatial operators of OGC. Finally, this paper proved the efficiency of the spatio-temporal DSMS by applying it to the real-time monitoring field which requires the real-time management of spatio-temporal stream data of moving objects.
Quality Control Scheme of GIS-based Bus Network for Stabilization of BIS - Focusing on Real-Time Public Transportation Information
Ju, Yong-Jin ; Ham, Chang-Hak ;
Journal of Korean Society for Geospatial Information System, volume 20, issue 1, 2012, Pages 33~41
DOI : 10.7319/kogsis.2012.20.1.033
BIS is an arrival guidance system which is able to supply passengers with bus service condition via Kiosks at a bus stop, internet and mobile service through pinpointing bus location in real time. It is very significant to improve the quality of traffic information by quality control of GIS-based bus network so as to maintain navigational information and to implement reliable BIS. Therefore this study aims to build criteria to quantitatively evaluate data quality of the product in accordance with the process in bus network data and to suggest guideline of quality control. To achieve this, we have categorized geometric and logical errors occurring during constructing bus network database by giving a specific case study on TAGO and set up sectional guideline and procedures to examine database for systematic and coherent quality control management. Proceeding from what has been said above, the outcome of our research leads to quality guarantee for objective and reliable bus network database and is fully expected to bring benefit of providing a more accurate public transportation information and improving reliability of BIS through preventing a variety of errors in system operation in advance.
An Assessment on the Hydraulic Characteristics of a Multi-dimensional Model in Response to Measurement Resolution and Spatial Interpolation Methods
Ahn, Jung-Min ; Park, In-Hyeok ;
Journal of Korean Society for Geospatial Information System, volume 20, issue 1, 2012, Pages 43~51
DOI : 10.7319/kogsis.2012.20.1.043
Due to the increasing demand to utilize water fronts and water resource effectively, a multi-dimensional model that provides detailed hydraulic characteristics is required in order to improve the decision making process. An EFDC model is a kind of multi-dimension model, and it requires detailed 3D (3-dimensional) terrain in order to simulate the hydraulic characteristics of stream flow. In the case of 3D terrain creation, especially river reaches, measurement resolution and spatial interpolation methods affect the detailed 3D topography which uses input data for EFDC simulation. Such results make hydraulic characteristics to be varied. This study aims to examine EFDC simulation results depending on the 3D topographies derived by separate measurement resolution and spatial interpolation methods. The study area is at the confluence of the Nakdong and Kuemho Rivers and the event rain implemented was Typhoon Ewiniar in 2006. As a result, in the case of the area-elevation curve, the difference by means of the interpolation methods was significant when applying the same measurement resolution, except at 160m resolution. Furthermore, when the measurement resolution was 80m or above, the difference in a cross-section was occurred. Meanwhile, the water level changes between interpolation methods were insignificant by the measurement resolution except when the Kriging method was used for the 160m measurement data. Velocity changes emerged according to the interpolation methods when measurement resolution was 80m or above and the Kriging method resulted in a velocity that had a considerable gap in relation to the results from other methods at a measurement resolution of 160m.
Application of LiDAR Data & High-Resolution Satellite Image for Calculate Forest Biomass
Lee, Hyun-Jik ; Ru, Ji-Ho ;
Journal of Korean Society for Geospatial Information System, volume 20, issue 1, 2012, Pages 53~63
DOI : 10.7319/kogsis.2012.20.1.053
As a result of the economical loss caused by unusual climate changes resulting from emission of excessive green house gases such as carbon dioxide which is expected to account for 5~20% of the world GDP by 2100, researching technologies regarding the reduction of carbon dioxide emission is being favored worldwide as a part of the high value-added industry. As one of the Annex II countries of Kyoto Protocol of 1997 that should keep the average
emission rate of 5% by 2013, South Korea is also dedicated to the researches and industries of
emission reduction. In this study, Application of LiDAR data & KOMPSAT-2 satellite image for calculated forest Biomass. Raw LiDAR data's tree numbers and tree-high with field survey data resulted in 90% similarity of objects and an average of 0.3m difference in tree-high. Calculating the forest biomass through forest type information categorized as KOMPSAT-2 image and LiDAR data's tree-high data of tree enabled the estimation of
absorption and forest biomass of forest type, The similarity between the field survey average of 90% or higher were analyzed.
Study on MEMS based IMU & GPS Performance in Urban Area for Light-Weighted Mobile Mapping Systems
Woo, Hee-Sook ; Kwon, Kwang-Seok ; Kim, Byung-Guk ;
Journal of Korean Society for Geospatial Information System, volume 20, issue 1, 2012, Pages 65~72
DOI : 10.7319/kogsis.2012.20.1.065
With the development of MEMS, small and low-priced sensors integrating IMU and GPS have produced and exploited for diverse field. In this research, we have judged that MEMS-based IMU/GPS sensor is suitable for light-weighted mobile mapping system and carried out experiments to analyze the characteristics of MTi-G, which was developed from XSens company. From a sensor which fixed to dashboard, coordinates results with no post-processing were achieved for test area. On the whole, the results show satisfactory performances but some errors also were discovered from parts of the road due to sensor properties, XKF characteristics and GPS reception environment. We could confirm the potential of light-weighted mobile mapping system. Experiments considering various GPS reception environments and road condition and more detailed level of accuracy analysis will be performed for further research.
The Development Directions of U-City Competitiveness Index
Kim, Kirl ; Kwak, Su-Jung ; Shin, Dong-Bin ;
Journal of Korean Society for Geospatial Information System, volume 20, issue 1, 2012, Pages 73~81
DOI : 10.7319/kogsis.2012.20.1.073
This study ultimately aims to suggest directions for development of U-City Competitiveness Index through thorough analyses of U-City competitiveness concepts and previous research in U-City-related index. In an attempt to reach the aforementioned goals, the concept of U-City competitiveness is presented based on existing publications on informatization age, future city, and U-City. Next, insights on the development of U-City Competitiveness Index are provided via analysis of research on indices regarding U-City and future city. Finally, the process of developing UCity Competitiveness Index and cautionary comments for each developmental step has been provided. Based on the research results, U-City competitiveness refers to the ability to respond to demands of residents in a timely manner as well as to manage U-City, ICT, U-City infrastructure, and U-City services that maximizes the efficiency of urban space management. In order for proper assessment of these criteria, development of assessment tools, selection of indices, standardization, allocation of weight per index, and construction of assessment framework are required.
Estimation of Canopy Cover in Forest Using KOMPSAT-2 Satellite Images
Chang, An-Jin ; Kim, Yong-Min ; Kim, Yong-Il ; Lee, Byoung-Kil ; Eo, Yan-Dam ;
Journal of Korean Society for Geospatial Information System, volume 20, issue 1, 2012, Pages 83~91
DOI : 10.7319/kogsis.2012.20.1.083
Crown density, which is defined as the proportion of the forest floor concealed by tree crown, is important and useful information in various fields. Previous methods of measuring crown density have estimated crown density by interpreting aerial photographs or through a ground survey. These are time-consuming, labor-intensive, expensive and inconsistent approaches, as they involve a great deal of subjectivity and rely on the experience of the interpreter. In this study, the crown density of a forest in Korea was estimated using KOMPSAT-2 high-resolution satellite images. Using the image segmentation technique and stand information of the digital forest map, the forest area was divided into zones. The crown density for each segment was determined using the discriminant analysis method and the forest ratio method. The results showed that the accuracy of the discriminant analysis method was about 60%, while the accuracy of the forest ratio method was about 85%. The probability of extraction of candidate to update was verified by comparing the result with the digital forest map.
An Analysis on the Change Pattern of Spatio-Temporal Land Price in Gongju City Using the Geostatistical Methods
Kim, Jung-Hee ;
Journal of Korean Society for Geospatial Information System, volume 20, issue 1, 2012, Pages 93~99
DOI : 10.7319/kogsis.2012.20.1.093
This study aims to identify spatio-temporal land price change pattern in Gongju city including the area incorporated and surrounding area depending on the Multifunctional Administrative City Construction. For this, GIS data was built by calculating the average land price each 209 Dong and Ri by the time of the year 2000, 2005 and 2010 based on. The first, the change in the land price was to identify in the 5-year intervals through a kriging interpolation as a kind of geostatistical techniques. The second, a trend analysis was conducted to know directional change pattern of the east-west axis and the north-south axis. Finally, the weighted mean center was calculated by the land price at a weight to examine moving direction on the center point of land price, point of view. The result is that the land price change pattern appeared visible higher growth on the eastern built in the Multifunctional Administrative City, moving direction on the center point of the land price appeared that the phenomenon was concentrated in the northeastern area.
Characteristic Analysis of Urban Traffic Noise in Officially Notified Land Price Evaluation
Eo, Jae-Hoon ; Yoo, Hwan-Hee ;
Journal of Korean Society for Geospatial Information System, volume 20, issue 1, 2012, Pages 101~107
DOI : 10.7319/kogsis.2012.20.1.101
Urban area is being continuously grown traffic volume due to diverse economic activities. Especially, the traffic noise, which occurs on the road of passing by residential district, is dropping quality of life as negative element of obstructing sleep at night. This study analyzed relationship between the officially notified land price and the traffic noise in residential district by using the estimating equation of traffic noise and GIS. As a result, the officially notified land price on a parcel of residential district along the road was indicated to be higher than a parcel where is located in other place. Even traffic noise was indicated to be higher. Accordingly, a plan is judged to be necessarily arranged that can be made appraisal of the officially notified land price, which is reflected the convenience of life and the quality of life at the same time in consideration even of traffic noise together as element of appraisal given evaluating the officially notified land price in residential district where is located in the downtown.
Evaluation of Optimal Grid Resolution for Hydrodynamic Proper Simulation
Ahn, Jung-Min ; Park, In-Hyeok ; Lyu, Si-Wan ; Hur, Young-Teck ;
Journal of Korean Society for Geospatial Information System, volume 20, issue 1, 2012, Pages 109~116
DOI : 10.7319/kogsis.2012.20.1.109
The effect of the grid resolution on the hydrodynamic simulation has been investigated by using CCHE2D and EFDC. Since a high resolution of the grid results in the increase of computation time, an appropriate grid resolution should be selected by considering the efficiency of simulation according to the objectives of projects. In order to understand the effect of grid resolution and determine the optimal grid resolution, several cases with different lateral grid resolutions have been simulated for the reach of Nakdong river at the confluence of Kumho river for the floods in 2006. Orthogonal curvilinear grids for the domain have been constructed from the survey products at the sections with the longitudinal interval of 20 m. Area-elevation curve and the comparison of simulated results with measured stage at the specific station have been used to check the effect of grid resolution. From the results, the existence of optimal grid resolution has been observed, which ensure both efficiency of computation and certainty of results.
Methodology to Develop the Technology of Web-based Satellite Photogrammetry
Kim, Eui-Myoung ;
Journal of Korean Society for Geospatial Information System, volume 20, issue 1, 2012, Pages 117~123
DOI : 10.7319/kogsis.2012.20.1.117
Many nations have been launched their own earth observation satellites due to much interest in space exploration. Because of this, the number of high resolution satellite are increasing day by day. With the development of web environment, general users have easy access to satellite images. The research conducted a basic study about web-based satellite photogrammetry in order to determine three dimensional coordinates easily without having profound knowledge of satellite sensor modeling. Various element technologies were analyzed to decide three dimensional coordinates by using high resolution satellite images in web environment, and case studies were conducted by using IKONOS satellite images. By applying parallel projection model, which is one of sensor modeling methods, epipolar image was created and prototype form of program that can decide three dimensional location in web environment was implemented. Through this, general users could decide three dimensional location easily in web environment and knew that already existed spatial information can be renewed and used in service area.