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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 4, Issue 2 - Dec 1996
Volume 4, Issue 1 - Jun 1996
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Analysis of Baseline Accuracy by GPS Relative Positioning
Kang, Joon-Mook ; Nim, Young-Bin ; Song, Seung-Ho ; Park, Joung-Hyoun ;
Journal of Korean Society for Geospatial Information System, volume 4, issue 2, 1996, Pages 15~22
As the exact geographical information has been nowadays required for effective developing and using of national land, in the country, there has been interested in using of GPS, and its practical use is expected. Various kinds of fundamental research for practical use of GPS is being accomplished. In this study, a test was carried out over 9 stations with baseline of the range of 1.5 to 210km, and the accuracy of baseline length by GPS relative positioning was variously considered. As result of this study, using a GPS receiving L1 frequency only, baseline accuracy for 2 hour observation was of the order of 0.3ppm for the 10km, and for I hour was below 1ppm. Using a GPS receiving dual frequency(L1/L2), baseline accuracy was of the order of 0.3ppm for the 100km to 200km as 3 hour observation using double difference methods by carrier phase. With basic on the result of this study, when observation and baseline processing are proceeded by the selected optimum observation time and using of baseline processing method, we can expect that geographical information will be acquired effectively.
Monitoring of Lake Water Quality Using LANDSAT TM Imagery Data
Kim, Tae-Geun ; Kim, Kwang-Eun ; Cho, Gi-Sung ; Kim, Hwan-Gi ;
Journal of Korean Society for Geospatial Information System, volume 4, issue 2, 1996, Pages 23~33
The conventional monitoring of water quality constrained by time and equipment produce neither complete nor synoptic geographic coverage of pollutant distribution, transport, and water quality. To circumvent these limitations in temporal and spatial measurements, the use of remote sensing is increasingly being involved in the lacustrine environmental research. Consequently, satellite remote sensing, with its synoptic coverage, is used to obtain the eutrophication-related water quality parameters in Daecheong reservoir in this study. The approach involved acquisition of water quality samples from boats of 15 sites on 20 June 1995 and 30 sites on 18 March 1996, simultaneous with Landsat-5 satellite overpass. Regression models have been developed between the water quality parameters and Landsat Thematic Mapper(TM) digital data. The best regression model was determined based on the correlation coefficient which was higher than 0.6. As a result, satellite remote sensing can provide meaningful information on water quality parameters. The regression models developed in this study show good relationship for transparency, turbidity, SS, and chlorophyll, but not for TN and TP because their spectral characteristics are not well defined.
Analysis of Chlorophyll Reflectance and Assessment of Trophic State for Daecheong Reservoir Using Remote Sensing
Kim, Tae-Geun ; Kim, Tae-Seung ; Cho, Gi-Sung ; Kim, Hwan-Gi ;
Journal of Korean Society for Geospatial Information System, volume 4, issue 2, 1996, Pages 35~45
The reflectance of chlorophyll was measured using UV-VIS spectrophotometer with the reflectance integrator in the laboratory in order to define its spectral characteristics. Sharp peaks appear at around 485nm and 655nm due to fluorescence and scattering, and the reflectance of chlorophyll increases at 580nm. With the increase in the chlorophyll concentration, the reflectance also increases. We have applied TM data to the reflectance spectrum of chlorophyll and have developed two formula with which one can estimate the chlorophyll concetration. Satellite re sensing, with its synoptic overage, is used to obtain the chlorophyll concentration in Daecheong reservoir. The approach involved acquisition of water quality samples front boat simultaneous with Landsat 5 satellite overpass. The remotely-sensed data and the ground truth data were obtained oil 20 June 1995 and on 18 March 1996. Regression models have been developed between the chlorophyll concentration and Landsat Thematic Mapper digital data. As the regression model was determined based on the correlation coefficient which was higher than 0.7 and the spectral characteristics of chlorophyll, and we have applied it to the entire study area to genelate a distribution map of trophic state. According to the trophic state map made based upon Aizaki's TSI and chlorophyll a concentration, the area where Okchun stream was flowing into was shown to be polluted the most all over the Daechung reservoir by showing an eutrophic state in June 1995 and a mesotrophic state in March 1996.
Development of Digital Image Acquisition Technique for Momentary Positioning of Dynamic Object
Han, Seung-Hee ; Kang, Joon-Mook ;
Journal of Korean Society for Geospatial Information System, volume 4, issue 2, 1996, Pages 47~54
It needs more than two images which are obtained in real time to decide 3D positioning of dynamic object. Though we use digital camera which is became wide utilization, but it can't obtain sequential image. So, in this study, we constructed momentary image acquisition system using video camera. Also, we took a photograph of LCD timer and dynamic object together for real time stereo image, and we obtained independent digital image from sequential image using video editor. As a result of the study, we could obtain the independent image as true color digital image of
pixels with 1/100sec accuracy in the same time. And it was good when we tested object target. For comparing 3D positioning accuracy, we could obtained negative with metric camera using B-shutter.
Optimal Design of Branched Water Supply System with GIS
Kim, Joong-Hoon ; Yeon, Sang-Ho ; Geem, Zong-Woo ;
Journal of Korean Society for Geospatial Information System, volume 4, issue 2, 1996, Pages 55~61
The objective of this paper is to show an optimal design model for branched water supply system which also can find the optimal location of pumping stations using linear programming. GIS is utilized in this model to better handle the data and the results front the optimization. The developed model considers hydraulic influences of some appurtenances such as supply tunnels and a filtration plant The model also considers tunnel construction cost which should be treated differently from pipe construction cost Different from other models presently available, the model guarantees a nonnegative pressure at every junction node in the system. The objective function includes annual operation cost (electricity rate) ill addition to initial construction cost, thus producing a more reasonable decision. The model selects the optimal diameter not in the form of continuous number but in the form of commercial discrete diameter (pipe size) using the pipe lengths as decision variables instead of pipe diameters. The model not only determines the optimal pumping head for each pumping station but also finds the optimal location and number of pumping stations. GIS is used to handle hydraulic and budgetary data automatically and to visualize the results for the of optimal design of the system. The model has been applied to an existing water supply system. 'The results show that the optimization model with the aid of GIS is helpful in the decision-nulling process for the design of more economical systems, and can be dot into practice successfully.
An Application of the Experts' GDSS to Housing Facility Allocation Processes
Chin, Yang-Kyo ; Ahn, Jae-Young ;
Journal of Korean Society for Geospatial Information System, volume 4, issue 2, 1996, Pages 63~77
This study suggests that experts' group decision support system (Experts'GDSS) should be helpful to solve specific planning/design problems. Dealing with AHP (Analytic Hierarchical Process), as a group decision model, maximal covering model, as a facility allocation model, and GIS (Geographic Information System; ARC/INFO in this study), as a spatial representation model, this study seeks to examine the implication of GDSS (Group Decision Support System) in the housing facility allocation. The results of this study clearly demonstrated that experts' GDSS acted its positive role, systematically providing the relative weights among the planning variables and objectives. Among different expert groups (e.g., planners, scholars, and public administrators), this study showed that there were certain differences in their decision structures, which generated different solutions in facility allocation. The further study, however, remains to investigate the more systematic implementation of GDSS in planning problems; for example, reducing the conflicts between different groups with different purposes.
Error Budget Analysis of Pseudorange for Improving the GPS Positioning Accuracy
Kim, Yong-Il ; Kim, Dong-Hyun ; Kim, Byung-Guk ;
Journal of Korean Society for Geospatial Information System, volume 4, issue 2, 1996, Pages 79~90
It is well known that point positioning using a C/A-code receiver is severely biased by errors in pseudorange. This paper shows the procedures of quantitive analysis for several error elements and that some methods to monitor SA(selective availability) of witch process is not opened are proposed. It is possible to verify the effects of SA in the Doppler shift and receiver clock drift variation. Easy methods to reduce SA effects are to fit second order polynomials for the one and a linear function for the other. With periodic autocorrelation functions. SA effects are analyzed and first order Gauss-Markov process parameters are decided.
The Technique of GIS Application for Transportation Impact Assessment
Yang, In-Tae ; Kim, Dong-Moon ; Kim, Yeon-Jun ;
Journal of Korean Society for Geospatial Information System, volume 4, issue 2, 1996, Pages 91~98
Transportation impact assessment which can take precaution for the traffic problem to control a plan on to expand traffic facilities through these results analyzed with the business for making a big problem of traffic is a very important course on the traffic management system as well as the traffic plan and it is necessary to collect and to edit and to analyze a great deal of data fully in object zone. So it is worth while to treat the collected data on to computer. Therefore Geographic Information System will give a remarkable result to Traffic Influence Evaluation everywhere. GIS not only can join the graphic or attribute data correctly and fast, but can achieve it prominent function for intention decision means. Then total system for Landuse of surrounding district, development-plan state, traffic-facility state, traffic-development public plan state and traffic demand is animated on Traffic Influence Evolution.
A study on the development of application-model in UIS using GSIS -A case of changwon city-
Park, Jung-Nam ;
Journal of Korean Society for Geospatial Information System, volume 4, issue 2, 1996, Pages 99~108
Recently, the view of value and the national consciousness are expressed in various fields because of a rapid urban expanding, enforcement of local self-government system and tendency of democratization over the whole fields of society. It is difficult to satisfy this tendency of social environment change with only existing data management system. Therefore, we would use GSIS mainly used in facility management to develop the integrated urban management system which is connected the related information to related Agency. As a result, we can expect the efficient development, maintenance-management of urban and much civil affairs. On this study, firstly, we select a study area and present a basic direction of various urban facility management system. secondly, we develop the integrated urban information system with related Agency that combined the various urban facility management. Finally, we intended of its expression. It aims to manage as far as the step which is presented a model of urban integrated management system at the study area
Design and Implementation of a Data Conversion System between SDTS and Informap
Oh, Byoung-Woo ; Lee, Kang-Jun ; Han, Ki-Joon ;
Journal of Korean Society for Geospatial Information System, volume 4, issue 2, 1996, Pages 109~121
It is very difficult to exchange geographical data among geographical information systems which store their spatial data with independent storage structures. Since, moreover, large amount of storage space is necessary to store spatial data and ex pen sive cost is required to input them, waste will grow as they are stored redundantly. Therefore, it is essential to share them with other geographical information systems by exchanging spatial data among them. In order to exchange spatial data efficiently, there exist several international standards for data exchange format. In this paper, we design and implement a data conversion system that converts geographical data between SDTS (Spatial Data Transfer Standard) which is adopted as the national standard for common data exchange format and Informap which is the existing mapping system. We first analyze the storage structures of SDTS and Informap, respectively and develop gateway functions according to these analyses for efficient conversion. Finally, we design and implement the overall data conversion system between SDTS and Informap using the gateway functions.
A Framework for Quality Evaluation of Geospatial Data
Cho, Gi-Sung ;
Journal of Korean Society for Geospatial Information System, volume 4, issue 2, 1996, Pages 123~136
Lately, the demand for data standardization become increased to obtain various data jointly along with development of information technology and diversity of society. Thus the research on tile definition and evaluation of data quality indicating accuracy and confidence of geospatial data, is required for this standardization. In this study, by virtue of comparison of definitions and evaluation methods of data quality element being selected from representative countries, the following results were obtained: (1) Application of ISO/TC211's Draft having accepted evaluation standard to KSDTS(Korea Spatial Data Transfer Standard) is desirable for definitions of data quality elements. (2) This study presented the quality evaluation of much more resonable geospatial data accompaning with quality element. Furthermore, this study suggests that this evaluation be applicable to KSDTS and be contained in the digital map product specification of National Geography Institute with more clearness of a report form of data quality evaluation result. (3) Studies on various sampling methods, establishment of AQL(Acceptable Quality Level) suitable for our country, and computer programming which can rapidly and automatically evaluate mass much of data are required.
Performance Comparision of Multilayer Perceptron Nueral Network and Maximum Likelihood Classifier for Category Classification
Lim, Tae-Hun ; Seo, Yong-Su ;
Journal of Korean Society for Geospatial Information System, volume 4, issue 2, 1996, Pages 137~147
In this paper, the performances between maximum likelihood classifier based on statistical classification and multilayer perceptrons based on neural network approaches were compared and evaluated Experimental results from both neural network method and statistical method are presented. In addition, the nature of two different approches are analyzed based on the experiments.
Development of coastal wetland inventory using Geographic Information System & Remote Sensing
Yi, Gi-Chul ; Im, Byung-Sun ; Woo, Chang-Ho ; Yang, Hyo-Sik ;
Journal of Korean Society for Geospatial Information System, volume 4, issue 2, 1996, Pages 149~159
It's required such information as location, size, distribution and abundance of wetlands as well as categorization of adjacent land-uses to manage effectively and to make wise planning decisions about resources of coastal area. Wetland inventory derived from the technology of Geographic Information System and remote sensing is inexpensive compared to the data based on conventional field data collection and cartographic methods. Furthermore, wetland inventory may prove to be useful references in the wetland management.
Integrating Video Image into Digital Map
Kim, Yong-Il ; Pyeon, Mu-Wook ;
Journal of Korean Society for Geospatial Information System, volume 4, issue 2, 1996, Pages 161~172
The objective of this research is to develope a process of integrating video image into digital map. In order to reach the research objective, the work includes the development of georeferencing technique for video images, the development of pilot system and the assesment process. Georeferencing technique for video images is composed of DGPS positioning, filtering of abnormal points, map conflation, indexing locations for key frames via time tag and indexing locations for total frames. By using the proposed building process, we could find the result that the accuracy of image capturing test points is
. The eventual meaning of this study is that it is possible to find a new conception of digital map, which overcomes a limitation of exiting two dimensional digital map.
A Study on the Interpolation Characteristics of the Scattered Geographic Data according to the Gridding methods
Lee, Yong-Chang ;
Journal of Korean Society for Geospatial Information System, volume 4, issue 2, 1996, Pages 173~180
In a grid based data transformation, the different gridding methods provide different interpretations of scattered data because each method calculate grid node values using a different weighted mathematical algorithms. Therefore, it is necessary to review the interpolated characteristics of some gridding methods according to search distance, search area and search options before determing the best method with a data set. For this, in this paper, six different gridding methods with the same search conditions are applied to a scattered data obtained from sterro-plotter. The interpolated characteristics of the scattered geographic data considered through comparison of coincidence between the data point and the grid node being interpolated. And also, shows the real application of gridding methods through calculating volumes and creating cross sections.
Development of Classification Method for the Remote Sensing Digital Image Using Canonical Correlation Analysis
Kim, Yong-Il ; Kim, Dong-Hyun ; Park, Min-Ho ;
Journal of Korean Society for Geospatial Information System, volume 4, issue 2, 1996, Pages 181~193
A new technique for land cover classification which applies digital image pre-classified by unsupervised classification technique, clustering, to Canonical Correlation Analysis(CCA) was proposed in this paper. Compared with maximum likelihood classification, the proposed technique had a good flexibility in selecting training areas. This implies that any selected position of training areas has few effects on classification results. Land cover of each cluster designated by CCA after clustering is able to be used as prior information for maximum likelihood classification. In case that the same training areas are used, accuracy of classification using Canonical Correlation Analysis after cluster analysis is better than that of maximum likelihood classification. Therefore, a new technique proposed in this study will be able to be put to practical use. Moreover this will play an important role in the construction of GIS database
Effective Decision of the Route Alignment with Digital Terrain
Kang, Joon-Mook ; Yoon, Hee-Cheon ; Lee, Hyung-Seok ; Lee, Sung-Soong ;
Journal of Korean Society for Geospatial Information System, volume 4, issue 2, 1996, Pages 195~203
The 3-D analysis of terrain for route design and selection is being used as important basic data for effective judgement of political draft. This study is to decide efficient alignment of the entry route and design bridge by modeling, analyzing and displaying surface with digital terrain data. In this study we analyze slope, aspect, shaded-relief, line of sight and watershed on the base of DTM such as contour, TIN and grid. And we can not only esti mate end-area volume for road construction by calculating cut and fill and displaying mass-curve but also recognize the scene after execution with simulation of road and terrain. The result of this study reveals that visual effects of the 3-D terrain data are very effective for designer and decisionmaker to select and review alternative route with regard to terrain characteristics.