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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
Journal Basic Information
Journal DOI :
Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography
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Volume & Issues
Volume 3, Issue 2 - Dec 1985
Volume 3, Issue 1 - Jun 1985
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A Study on Mapping using Projection Moir Technique
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 3, issue 2, 1985, Pages 1~10
Moire technique is generally divided into shadow Moire Technique and Projection Moire Technique. In this paper, determinating the direction of reference planes for this system, by comparing the results of this system with those of general terrestrial photogrammetry, is an objective of this paper. For the objective, control surveying is done and the results of control surveying are compared with those of moire photograph. In this technique, it is found that though the positions of a projector and a reference grid are not moved, a desired moire contour whose the reference plane is different respectively is easily obtained by changing the pitches of a master grid and a reference grid on an object. Also it is found that when the pitches of the two grids on an object are equal, a moire contour which has the reference plane parallel to the object can be obtained.
A Study on Astro-Geodetic Geoid in Korea
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 3, issue 2, 1985, Pages 11~17
In the three dimensional Cartesian Coordinate System such as the satellite geodesy the relationship of the geoid and the reference ellipsoid must be known. Therefore, the determination of geoidal heights is regarded as one of the most important problem in geodesy. This paper deals with determination of astro-geodetic geoid by the spherical surface polynomials interpolation method. The data that astronomical deflection of the vertical was published by National Geography Institute is applied. The map of geoidal heights is drawn out. This shows that Tokyo Datum have influenced on Korea.
A Study on the Analysis of Trilateration Adjustment by Finite Element Method (FEM)
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 3, issue 2, 1985, Pages 18~31
The object of this study is to analize the trilateration adjustment by FEM. FEM is a numerical method for analysis dealing with problems of displacement and variation about the object. Since a plane trilateration net can be likend to a plan structural frame work in stress analysis, the technic of FEM can be used for trilateration adjustment Thus, this study applied FEM and Condition Equation Method to a trilateration adjustment, and investigated precision and characteristics of them.
Development of Analytical Calibration Model of Camera in Photogrammetry
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 3, issue 2, 1985, Pages 32~38
The purpose of this paper is to develope the analytical calibration model and to present its efficiency and problems for elimination of systematic errors. For this purpose, lens distortion in close-range photogrammetry is analized. From the obtained accuracy of object space coordinates, it is found that the calibration model included only
term is effective for metric camera, and film deformation has to be considered not only in non-metric camera but also in metric camera.
A Study on the Analysis of Accuracy for Terrestrial Convergent Photos by Collinearity Condition
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 3, issue 2, 1985, Pages 39~47
This study analyzes space resection and space intersection for terrestrial convergent photos taken on the straight line and the circular line by collinearity condition. The purpose is to investigate the properties of convergent case, and to suggest the optimum angle of convergence. Accuracies at convergent angles less than 20
are lower than those in normal photos, but by changing from 20
the accuracy is improving with the highest at 90
convergence. Also, convergent photos on circular line is far higher than those on straight line in accuracies of results, therefore it is expected to apply this results effectively for precise analysis of various facilities.
Free Network Adjustment by Application of Generalized Inverse
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 3, issue 2, 1985, Pages 48~62
A method for the free network adjustment is proposed, based on the application of generalized inverse matrix (g-inverse). If the network adjustment is executed according to the solution with parameters, especially when all coordinates are considered as parameters to keep unity strength, the matrix of normal equation will be singular. This paper discusses the problem of singular matrix and the analysis of accuracy between conventional method and the free network adjustment of trilateration. In case of the adjustment, the RMS errors of adjusted X, Y coordinates are increased to 35.6% in a polygon, central-point figure, and 50.5% in a quadrilateral. In the elements of error ellipse, the RMS errors are decreased by
24.5% (a) and
5.0 % (b) in the polygon,
42.6% (a) and
49.2% (b) in the quadrilateral. Introduction of free network adjustment, therefore, could be applied to improvement of relative accuracy in the horizontal positioning.