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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 8, Issue 2 - Dec 1990
Volume 8, Issue 1 - Jun 1990
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The Construction of Digital Terrain Models by a Triangulated Irregular Network
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 8, issue 2, 1990, Pages 1~8
A regular grid or a triangulated irregular network is generally used as the data structure of digital terrain models. A Regular grid is simple and easy to manipulate, but it can't describe well terrain surface features and requires vast volumes of data. In the meantime, a triangulated irregular network has complex data structure, but it can describe well terrain surface features and can achieve the accuracy suitable to its application with relatively little data. This paper aims at the construction of efficient digital terrain models by the improvment of a triangulated irregular network based on Delaunay triangulation. Regular and irregular data set are sampled from existing contour maps, and the efficiency and the accuracy of the two data structures are compared.
A Study on the Shoreline Changes By the Geodetic Characteristics of the East Sea and on the Numerical Model for its Predicting
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 8, issue 2, 1990, Pages 9~16
This is a geodetic study on the the shoreline changes occurred by the facilities constructed in the beach. There are emperical, hydrological and numerical methods in predicting of the shorline changes. Numerical method is the most suitable method in the field of geodesy. There are many predicting models. This study adopted one-line model because it has a few hydrological factor and simplify the natural phenomena. This study established the ideal seawall boundary condition, applied the explicit model and the implicit model in the Dongsan harbour in East Sea, and could predict the optimum seawall position for protection of shore. The results are following ; Seawall protect shore of which input angle of wave is below 20
, a ratio of wave height bleak/line does not effect in shoreline changes. The implicit model is accuracy but can not predict longtime change. But the explicit model is the opposite of the implicit model.
The Survey of Interpolation Methods for the Digital Terrain Model in the Geographic Information System
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 8, issue 2, 1990, Pages 17~22
The Digital Terrain Model(DTM) data in the Geographic Information System(GIS) needs to be interpolated for various purposes. Three interpolation methods-Bilinear, Bicubic Spline, and Gregory-Newton interpolation-were used, compared, and analyzed in terms of the visual comparison and numerical analysis in the hilly terrain and relatively flat terrain.
Analysis of very close-range photogrammetry by non-metric camera
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 8, issue 2, 1990, Pages 23~29
Non-metric camera is more profitable than metric camera for geometric analysis of small and elaborate structures, because focal length control of non-metric camera is flexible while generally metric camera has limited focal length. And if the problem of conventional method requiring much time and endeavor to measure three dimensional positions of control points will be solved effectively, it is possible to analyze very close-range photogrammetry more easily and quickly. The purposes of this study are to propose the efficiency of non-metric camera and to reduce difficulty of control survey sharply by introducing self-control survey method. For these, very close-range photographs of the small object were obtained by using non-metric camera calibrated for systematic errors and then bundle adjustment is used for analysis procedure. As a result, the superiority of non-metric camera in analyzing very close-range photographs and the application proptriety of self-control survey were proved, therefore it is expected to be able to apply to precise analysis of small structures or spearhead parts.
Theoretical Adjustment of Closed Errors in Traverse Surveying
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 8, issue 2, 1990, Pages 31~34
In this study, the closed errors appeared in traverse surveying are precisely adjusted in consideration of the weights both observed angle and distance. The results of this study show that the theoretical adjustment is more accurate than the compass rule or the transit rule by distribution of the observed angle errors.
A Study on the Improvement of Accuracy in Plane Positioning by Trilateration
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 8, issue 2, 1990, Pages 35~43
In this paper a two dimensional network adjustment theory is developed to analyze the plane trilateration network of single triangle network, of quadrilateral network, of polygon trilateration network and of combined network. The characteristics of error were analysed by developing an error propagation equation for each form of plane trilateration network. In case of combined network, the result of error analysis was represented by error ellipses and gross error detection was carried out by data snooping method.
The Effects of Declination and Curvature Weight in DEM
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 8, issue 2, 1990, Pages 45~51
DEM must have a high accuracy against the actual topographic model. A model which can compute heights responding to random plane position by using of the topographic data and interpolation must be constructed. Interpolation affected by the accuraccy of the observations included noise, which affected by the slop and curvature weight. Data smoothing is a method to reduce the noise. Average declination and area ratio are variable which result similarity in according to slope. But in local area, area ratio well shows a local change. This study try to classify the terrain by the declination to analysis the effects of the declination and curvature weights, and then to represent the most probable model. The result are following : In terrain classification by the slop, p16 and p24 were fitted in the plane surface fit p16 and S in the varying surface, and S and p24 in the irregular surface in classification by curvature, p24 and S were fitted in the plane or varying surface, and p16 in the irregular surface In case of hybrid, p16, p24 and S are fitted in the plane, varying and irregular surface respectively. Smoothing is the most effective in case of slope of 50 persentage and of curvature weight of 0.0015.
A Study on the Application of Combined Interpolation and Terrain Classification in Digital Terrain Model
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 8, issue 2, 1990, Pages 53~61
In this study, terrain classification was done by using the quantitative classification parameter and suitable interpolation method was applied to improve the accuracy of digital terrain models and to increase its practical applications. A study area was classified into three groups using the quantitative classification parameters and an interpolation equation suitable for each group was used for economical application of the interpolation method. The accuracy of digital terrain models was improved in case of large grid intervals by applying combined interpolation method suitable for each terrain group.