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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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Journal DOI :
Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography
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Volume & Issues
Volume 9, Issue 2 - Dec 1991
Volume 9, Issue 1 - Jun 1991
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우리나라의 천문측지 지오이드에 관한 연구
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 9, issue 2, 1991, Pages 1~8
The geoid is the one of major suject in Geophysics and Geodesy. The iregularities of the geoid will affect the computation of precise geodetic coordinates and moreover will cause an errors in trajectory computations and reference directions for inertial guidance system. The aim of this study is to develope the best local geoid model for Korea. For this purpose, an astrogeodetic levelling and surface fitting techniques have been applied in determination of the geoid as a first trials. As a result of it, a local geoid has been obtained with the standard errors of
0.66m respectively and the maximum geoid undulation in Korea is found as 22m~23m approximately.
A Study on the Traffic Accident Analysis using by 3-D Photogrammetric System
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 9, issue 2, 1991, Pages 9~18
A diagram has been annexed to the spot inspection record of the traffic accident were drawn up with measuring-tape heretofor. However, conventional reduction method have been usually contained the various problems according to the social development. To solve these problems, it was performed that photogrammetric method are measured 3-D coordinate of needed points and precised plotting of traffic accident spot investigation. Also, they have produced some good effects on speedy spot investigation and settlement of traffic stagnation. Because semi-metric camera and MR2 system are utilize for low cost, simple operation and almost unnecessary for control point surveying, these fittings being at the close-range photogrammetry will be extremely powerful over versatile fields like traffic accident in police.
A Study on the Earthwork Calculation on Unequal Intervals by Nonlinear Analysis
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 9, issue 2, 1991, Pages 19~36
The purpose of this paper is to calculate the excavation volume of unequal interval grid using nonlinear boundary in earthwork volume determination. The formulas by unmerical annlysis in this paper is compared with linear and nonlinear spot level method of unequal interval grid. As a result algorithm of derived formula by numerical analysis should provide a better accuracy than the linear and unlinear spot level method currently in use. Practical application of each method is illustrated by three model test.
A Study on the Network Adjustment Analysis for Planimetric Positioning
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 9, issue 2, 1991, Pages 37~48
In this study, conventional network adjustment and combined network adjustment methods for single network adjustment methods for single network and centric combination network were compared by the analysis of root mean square error and standard error ellipse of observed points. It can be concluded from this study that for conventional surveying methods, the accuracy is in theorder of trilateration, traverse and triangulation, and for the case of combined surveying method, the accuracy is in the order of multilateration surveying, combined traverse and combined triangulation-trilateration surveying. And when establishing new control points, the accuracy can be improved by increasing redundant observations of centric combination network instead of using the single network. Also, in case of combined traverse surveying by adding observable laterals, accuracy level of trilateration could be achieved, and it was found that traverse is effective for large areas where sighting is easy, and combined traverse surveying is effective for urban areas where sighting is difficult.
A Study on Three Dimensional Positioning of SPOT Satellite Imagery by Image Matching
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 9, issue 2, 1991, Pages 49~56
In this study, 3D positioning of CCT digital imagery was done by using a personal computer image processing method to increase the economic and time efficiency of SPOT satellite imagery. Image matching technique which applies statistical theories, was applied to acqusition of satellite imagery. The reliability of these coordinates was anlysed to presente a new algorithm for three dimensional positioning necessary in digital elevation modelling and orthophoto production. In acquiring image coordinates from CCT digital satellite imagery, accuracy of planimetric and height coordinates was improved by applying the image matching technique and it was found through analysis of correlation factors between sizes of target window that 19
19 pixels was the most suitable size for image coordinate acquisition. From these results, it was able to present an algorithm about utility of digital imagery in the analysis of SPOT satellite data.
A study on the Improvement of the National Surveying System
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 9, issue 2, 1991, Pages 57~66
This study aims to study the present situation of our national surveying system, in fields such as professional surveyor system, the surveying industry, the consultancy pricing system. The problems are identified to present an improvement plan for the system. The professional surveyor system was compared to other systems in the Asia Zone and the surveying industry related laws and regulations, were compared with those of foreign countries as well as with the regulations of the architectural industry. The improvements suggested include upgrading of surveying technology and of surveying personnel, increase investment into education and research and development. The government should support in policy upgrading such as providing aids to small scale companies and in distributing the concentrated activities in the capital city to other regional areas. Also the pricing for the surveying activities and consulting activities should he adjusted in fields such as price items, grades of surveyors and overhead costs.
A Study on the Geoid in and around the Korean Peninsula by analysing OSU89B
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 9, issue 2, 1991, Pages 67~72
OSU89B is analysed for study about the geoidal undulation and the vertical deflection in and around the korean peninsula. Geoidal undulations vary from 3m to 35m in this area referred to GRS1980 ellipsoid.
values vary from -8.9" to 8.0" and
values vary from -13. 1" to 9.0". High westward deflection is a distinctive feature in and around the Korean peninsula.he Korean peninsula.
A Study on the Monitoring of the parts of Precision Machine using Non-Metric Camera
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 9, issue 2, 1991, Pages 73~80
Identifying linear form of the parts of precision machine, precise monitoring is indispensable. Therefore, in this study, close-range photogrammetry being tried to screw one of the parts of precision machine, using non-metric camera that is calibrated by plumb line method. Also, it is analyzed three dimensional values of tortien, offset, section and thickness. From results of this study, monitoring of the parts of precision machine was conducted efficiently using non-metric camera and possibility of this application was proved.
Improving Correctness in the Satellite Remote Sensing Data Analysis -Laying Stress on the Application of Bayesian MLC in the Classification Stage-
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 9, issue 2, 1991, Pages 81~91
This thesis aims to improve the analysis accuracy of remotely sensed digital imagery, and the improvement is achieved by considering the weight factors(a priori probabilities) of Bayesian MLC in the classification stage. To be concrete, Bayesian decision theory is studied from remote sensing field of view, and the equations in the n-dimensional form are derived from normal probability density functions. The amount of the misclassified pixels is extracted from probability function data using the thres-holding, and this is a basis of evaluating the classification accuracy. The results indicate that 5.21% of accuracy improvement was carried out. The data used in this study is LANDSAT TM(1985.10.21 ; 116-34), and the study area is within the administrative boundary of Seoul.
A Study on the Generation of Digital Elevation Model from SPOT Satellite Data
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 9, issue 2, 1991, Pages 93~102
This study aims to develop techniques for generating Digital Elevation Model(DEM) from SPOT Computer Compatible Tape(CCT) data, so as to present an effective way of generation of DEM for large area. As the first phase of extracting ground heights from SPOT stereo digital data, the bundle adjustment technique was used to determine the satellite exterior orientation parameters. Because SPOT data has the characteristics of multiple perspective projection, exterior orientation Parameters were modelled as a function of scan lines. In the second phase, a normalized cross correlation matching technique was applied to search for the conjugate pixels ill stereo pairs. The preliminary study showed that the matching window size of 13
13 was adequate. After image coordinates of the conjugate pixels were determined by the matching technique, the ground coordinates of the corresponding pixels were calculated by the space intersection method. Then DEM was generated by interpolations. In addtion an algorithm for the elimination of abnormal elevation was developed and applied. The algorithm was very effective to improve the accuracy of the generated DEM.
Merging of SPOT P-mode and XS-mode Images using Color Transformation and Image Enhancement
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 9, issue 2, 1991, Pages 103~113
The accuracy of input coordinates of ground control points and check points affects great influences to the results of ground coordinate computation in using SPOT digital image data. The original SPOT images displayed on CRT are not usually adequate for identifying the object features and determining the point positioning. Hence, appropriate image processing techniques such as contrast enhancement, subpixel interpolation, edge enhancement, and spatial filtering are needed. In this study, the principles of digital image processing needed for accurate three dimensional positioning and spectral characteristic analysis are investigated. The algorithms for the actual applications are developed and programmed. And using the developed image processing software, some SPOT P-mode and XS-mode images are merged into the SPOT P＋XS, the high-resolution color composite image.
Developement of Data Process Techniques of Land Information System Using Satellite Image
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 9, issue 2, 1991, Pages 115~118
Land information system is a data base describing physical or legal characteristics of land areas, sometimes called a land records system. The digital remote sensor data is useful to calculate some fundamental statistics of the spectral data. This normally involves computing the minimum and maximum value for each band imagery, the mean, the standard deviation, a variance-covariance matrix, and frequencies of brightness values in each channel which are used to produce histograms. In this paper, author emphasize scanning for aerial photos, and next paper will be scanning for satellite image.
A study on the Analysis of Land Slide Using Aerial Photogrammetry
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 9, issue 2, 1991, Pages 119~125
On hill slope, apartment, housing, and school construction may be many potential problems and damagemay be involved in construction. Model sites for landslides are two apartment and high school areas in Pusan, 1991. This paper is described the landslides forecasting in photointerpretation of aerial photographs.
A Study on the selection of the optimum route using geographic information system
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 9, issue 2, 1991, Pages 127~138
This is a study on the selection of the optimum route using geographic information system. In general, the selection of route was classifed in order of candidate route zone, optimum route zone and optimum route, this study comes under optimum route that is the last part in the route planning. The optimum route is get attined on the weighted matrix table that based on landuse status, land value, slope degree of each grid cell of the test area, and also we suggest application possibility of geographic information system in the route planning with the comparision and analysis of the three selection route in this study.
The Selection of Significant Points from Grid DEM by High-Pass Filtering
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 9, issue 2, 1991, Pages 139~149
In general, Digital Elevation Models(DEM) are constructed in a grid format for this form is advantageous to capture data automatically and is easy to manipulate. But, grid DEM requires vast volumes of data to represent terrain features finely and accurately as its data is sampled in a regular space. This paper aims at constructing compact DEM by selecting the significant points from grid DEM which affect well the terrain features. For the purpose, the significant points is detected by the high-pass filtering using Laplacian operator and gradient operator. The results of this study show that the Laplacian operator is more efficient than the gradient operator in selecting the significant points for compact DEM.