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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 7, Issue 2 - Dec 1989
Volume 7, Issue 1 - Jun 1989
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Combined Adjustment of Geodetic Levelling Net in Korea
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 7, issue 2, 1989, Pages 1~6
The adjustment of levelling net is being done to the order of nets independently by using the least square method. For the small size net, it has difficulties in verification and statistical analysis of the net since the degree of freedom is low At the same time, it is also difficult to evaluate the error of lower order net correctly. The aim of this study is to analyse the properties of combined adjustment method compared with the independent adjustment method by using the data which have been measured during 1967-1987. Another aim is to analyse the influences of normal orthometric correction and changes of datum. Finally, Korean leveling net has been evaluated by applying real redundancy and variance component estimation.
A Study on the Earth-Volume Determination in Road Design by D.T.M.
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 7, issue 2, 1989, Pages 7~19
The developments in remote-sensing, digital mapping, and automation of land information system have provided the impetus for the increasing use of Digital Terrain Models in engineering planing and design. In this paper, an evaluation is made on tile method of accurate earth-volume determination in computerized road design using by Digital Terrain Models. The result of numerical test shows that the
-1 Model is the most efficient model in Earth-volume determination of road design.
Input Module for Levelling Data
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 7, issue 2, 1989, Pages 21~26
This module to input Korean Level Data has 4 capacities of inputing, deleting, referencing and saving. Data file of level line consists of sorted list of node on the basis of “ABSTRACT”. For easy work, interactive method was employed. As the result of removing the boring routine by applying the characteristics of level data, working efficiency was increased. This program was written in C-language and runs on a minimum hardware configuration of IBM PC/XT with 640KB memory, In the future, these unit modules combine to form Generalized Level Information System.
Junction Schemes for the Densified Control Network
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 7, issue 2, 1989, Pages 27~34
Geodetic control networks have been used for more than 200 years by peculiar national system, both to establish the size and shape of the earth, and to determine the positions of points on its surface. Junction schemes for the densified geodetic network are proposed to the case whether the accuracy of existing network is known or unknown, in this paper. The concepts of adjustment, under the condition of partial
＝min., is applied to densification system. Moreover, the technique of epoch analysis, which is often used in small deformation survey net, is introduced to the national control network for unstable point detection.
Combined Adjustment of Photogrammetric and Geodetic Observations for Accuracy Improvement
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 7, issue 2, 1989, Pages 35~43
The improvements of highly accurate and dense control networks are major requirements to carry out numerical surveying and a large scale mapping for cadastral renovation. In the most conventional photogrammetric solutions, adjusted control coordinates have been applied to block triangulations. However, this study, imploying real data and those of simulated as well, contributes to a simultaneously combined adjustment. It also contains such photogrammetric as photocoordinates and geodetic observations like distances, angles and hight differences. Its purpose is to introduce the improved results, despite it is not sufficient for the ground network. In addition, through the detection of gross error, more precise observational data can be selected for the better adjustment. All in all, the result of this study can be summarized as follows : First, even if the ground control points are not sufficient nor existed at all, the combination of pbotogrammetric and geodetic observations are improved its accuracy. Secondly, the case #2 is more accurate than that of #3, and the case #7 comes into close to that of #6.
A Study on the Correction of tens Distortion by Plumb tine Method
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 7, issue 2, 1989, Pages 45~51
Lens distortion would produce image displacement, therefore correction of lens distortion is required urgently to improve accuracy of results in photogrammetry. The objective of this study is to find out lens distortion coefficients versus focussing distance on non-metric and metric camera and to investigate propriety of application of lens distortion coefficients to three dimensional analysis. Analytical plumb line method which needs not perform control survey and space resection and requires only one photograph was used in order to get lens distortion coefficients. As the result of this study, the coefficients of radial and tangential distortion change as focussing distance changes, and consequently it is reasonable to apply the eigenvalues of lens distortion coefficients according to focussing distance. When these coefficients were applied to actual measurement, standard errors decreased about 30% or 76% remarkably.
A Study on Terrain Classification and Interpolation in Digital Terrain Model
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 7, issue 2, 1989, Pages 53~61
In this paper the quantitative classification parameters of terrain which can be practicable to the interpolation of digital terrain model forming a regular grid pattern have been suggested and objective terrain classification have been established by making a cluster analysis using these parameters. Also, interpolation suitable to the classification of terrain has been used by making a descriminant alaysis from description parameters of terrains. The terrain classification in this paper was dependent upon two parameters of the ratio horizontal area to inclined area and the magnitude of harmonic vectors. And the studying area was seperated to three groups of terrains by these two parameters. Three groups of terrains could be classified into the discriminant functions. By determining the ratio of area and harmonic vector magnitude in any terrains using the above discriminant function, it was possible to discriminate the terrains to apply the interpolation practicable to the terrain characteristics.
A Study on the Accuracy of Convergent Photographs Using Non-Metric Camera
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 7, issue 2, 1989, Pages 63~68
This study was to develope the methmatic prediction model of accuracy for the convergent photographs using nonmetric camera in close range photogrammetry. By analyzing positioning error on object distance and convergent angles, the validity of the new formulae for prediction of accuracy were proved. Rational design of camera systems and convergent angles according to accuracy demands in plane and height were developed using these formulae.
Old Atlases Made in Chosen Dynasty
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 7, issue 2, 1989, Pages 69~84
From the beginning of Chosen Dynasty there were growing interest of making maps of Korea as well as world maps. After the 17th century, county maps were especially made extensively through administrative channels, and county maps were collected and bound by each provinces in a form of atlases. Following this line, new simple atlases were appeared for general use. The atlases were consisted with map of the world, China, Japan, Ryukyu, Korea, provincial maps of Korea. This paper wilt put an emphasis on general atlases which used widely during the later Chosen Dynasty until almost to the end of 19th century with a brief description of atlases of county maps.
The Use of Linearly Transformed LANDSAT Data in Landuse Classification
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 7, issue 2, 1989, Pages 85~92
The aim of this study is to find out the combination of effective transformed data, applying Remote Sensing techniques, as to the classification and particular objects by transforming the MSS data and TM data of the satellite LANDSAT into several linearly transformed data. Since one of the problems in the processing of the LANDSAT data is the vastness of the data, the Linear Transformation could be a method to perform analysis of those vast data, more efficiently and economically. This method is carried out as follows : (1) offering the simplicity over complex data, (2) selectional processing over redundant data and removing unnecessary data, (3) emphasizing on the object of the study ; by transforming multispectral data through linear calculation and statistical transformation. In this study, the analysis and transformation of the data have been performed by means of Band Ratioing and Principal Component Analysis. As the classificatory consequence, Infrared/RED Ratioing which expands the characterization of green vegetation, has been useful for a distinctive classification among other classes. For the Principal Component Analysis, band 1,2,7 are efficient in the classification of the green vegetation.