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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography
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Volume & Issues
Volume 12, Issue 2 - Dec 1994
Volume 12, Issue 1 - Jun 1994
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Building of Land Ledger Database Using Land Information System
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 12, issue 2, 1994, Pages 141~146
At the present time the cadastral sections has a document for constructing database of land register and commit to record the assessed cost of land in field. Kumjung-Ku, Pusan is a model in this study. It is possible to investigate the present land record by connecting graphic data with attribute data in author's program. AutoCAD make possible to connect graphic data with attribute data. Because of limitation of constructing database in AutoCAD, authors construct independent database in Clipper's circumstance. Database in AutoCAD and Clipper is connected to the menu-file in AutoCAD's circumstance.
Techniques of Selection of Landslide Hazard Area on Analysis of Topographical Data
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 12, issue 2, 1994, Pages 147~154
Landslides in the close residential area occur loss of life and properties. Usually soil mechanical methods and multi-statistical methods used to analysis the landslide. The factors of landslide analysis by multi-statistical methods are composite operations of geology, topography, vegetation, and climate etc. In this study, existing landslide areas are cheesed to extract the characteristics of their geographical data for adaption of Multi-statical methods. Authors give a weight to their values and analyze the some area using technique of overlap on GSIS.
A study on improvement of positioning accuracy using DGPS technique with low cost GPS modules
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 12, issue 2, 1994, Pages 155~161
Accurate positioning method using low cost GPS modules is proposed, which use the technique of differential GPS. DGPS experiments have been made using two coarse-acquisition (C/A) code GPS modules. Position accuracy of better than 5 m was obtained for position dilution of precision (PDOP) of 2-3 and that of better than 10 m after filtering was obtained for PDOP of about 9 in a local area. Static DGPS experiments were performed at Kookmin university with the DGPS correction data of KRISS reference station at Taejon. The distance between two stations is about 140 km. The results show that precision of the position is about 10 m (2 drms), which is ten times better than the results with the GPS module alone. Accuracy of about 10 meters can be obtained in near real time by the DGPS service with a reference station in our country.
A Study on Effective Range of Baseline Measurement Using Single Frequency
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 12, issue 2, 1994, Pages 163~172
As for the baseline measurement using geodetic GPS receiver, this paper puts forth the effective measurement range of a low-priced GPS system receiving Ll frequency only. Compared with the data of baseline eliminated the ionospheric effects with L1/L2 frequencies, the results with Ll frequency approximate to those with dual frequency within the range of 15 km (the baseline discrepancy of the two methods is less than 2 cm). The results with Ll frequency are better within the range of 18 km. Based upon the analysis of data, we find that the convergence limit of integer ambiguity-applicable to double difference fixed solution- is about 18 km and the ionospheric effects have a great influence on the results when the baseline are longer than 20 km. This study also presents a standard which makes it possible to select the favorable data from the results of the GPS relative distance measurements.
Correction for Scanning Errors of a CCD Camera Scanner
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 12, issue 2, 1994, Pages 173~180
One can see more and more photograrmmetric applications dealing with the extraction of information from images obtained with CCD (Charge Coupled Device) camera scanners. In order for this information to be useful, the scanning errors of scanners must be known through a calibration. Investigation of this study is given to the detailed procedure of the correction for scanning errors created during the scanning of photographs with CCD camera scanner using the three kinds of high resolution reseal plates prepared. The geometric corrected digital images for scanning errors were generated and the accuracy of the resulting new images for each types of plates were checked comparing its image coordinates with there corresponding ground coordinates for the check points.
A Study on the Earthwork Volumes Using Geographic Information Systems
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 12, issue 2, 1994, Pages 181~186
This paper applicate the digital elevation model(DEM) method in geographic information systems(GIS) on the earthwork volumes, intending to present an efficient geographic information-obtain method and an optimum earthwork volumes method after analyzing the obtain method of geographic informations which are made up of as spatial data(X, Y) and attribute data(Z), analyzing area determination method by geographic information-obtain method each other and the accuracy of earthwork volumes computation. The results of this paper showed that the method of earthwork volumes computation, which was based on the earthwork volumes-calculation grid applied by the DEM method of based grid to randomly get the geographic information of geographic transformation point and translated geography into nonlinear and unequal interval, was very efficient.
Development of a PC-Based Water Supply Facilities Information System
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 12, issue 2, 1994, Pages 187~197
The purpose of this study is to develop a PC-based water supply facilities information system. This system will be a major stepping-stone for developing Geographic Information Systems(GIS) in Korea, which is constructed by integrating the technologies related to Automated Mapping(AM) systems and Facilities Management(FM) system. And the results of this study are as follows: (1) After the user needs assessment, it was decided that information management of the water supply facilities including distribution pipes, valves, and leaking management are the most urgent tasks. So, the system was developed focusing on these tasks. (2) After the system design and development, the water supply facilities information system consists of graphic database management system, attribute database management system, internal interface that links graphic data and attribute data, and graphic user interface for user-friendliness. (3) The graphic data and the attribute data including distribution pipes, leading-pipes, valves, and parcels at the study area, Non-Hyun Dong Kang-Nam Gu in Seoul, were used in this system, and the water supply facilities database was established. It was applied to test these facilities, and proved that the system developed in this study is efficient to manage information within the scope of this study. (4) The function using the parcel identification number was efficient to locate the address concerned.
Development of a Basic Software for Land-surveying Computations
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 12, issue 2, 1994, Pages 199~208
A software package for the basic computations in land-surveying is developed. The least square adjustments for the horizontal and vertical control networks are the main functions of the program, with various computational functions for the traverses, intersections and resections. The coordinate transformations are included as well. The coordinates of the stations and the observations are stored in the databases so that they can be used in any stage of the software process. An editor to manipulate the database is also accomplished.
A Study on Triangulated Irregular Network Generation Method for GSIS
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 12, issue 2, 1994, Pages 209~218
This study aims to generate triangulated irregular network in a form of digital terrain model which is being increasingly used. In general, grid digital elevation model and triangulated irregular network are reasonable units for solving terrain problems. But, triangulated irregular network is an efficient alternative to grid digital elevation model because of their efficiency in storing data and their convenient data structure for accommodating irregularly spaced elevation data. Various methods represented for extracting triangulated irregular networks from grid digital elevation model, and then algorithm that get accurate results for triangulation with their data set was introduced. The new approach for triangulation in this study uses the Elevation and Changeable Distance criterion, and adding interpolation points and restricted constraint lines can generate triangulated irregular network which is more close to real surface. This made database efficient construction and could be used for many applications of geo-spatial information system.
A Study on the Selection of the Optimum Route Considering on the Shortest Distance and the Balance of Earthwotk Volume in DTM
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 12, issue 2, 1994, Pages 219~226
When a route is planned, the distance of route and earthwork volume have an important role as an economic factor. In this paper, an investigation is made on the selection of optimum route with respect to two factors above mentioned. For this investigation, a numerical test is also executed to two different types of terrain, i.e. terrain with constant slope and no undulation and terrain with slope and undulation. The results show that the shortest route is determined by the degree of undulation with no relation to the slope of topographic model, and the earthwork volume is affected by the amount of undulation and interpolation function.