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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 14, Issue 2 - Dec 1996
Volume 14, Issue 1 - Jun 1996
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A study on the transformation of coordinate on TM projection
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 14, issue 2, 1996, Pages 119~126
TM projection is widely used for surveying and mapping. However, the complicated computations and process are required and, moreover. the different results of computation may occur according to different formulae and coefficients. In this study, the transformation formulae are classified into 4 categories and the computations are executed according to the categories. The computations are also made to different value of the circular constant,
. The result of test shows that the enough number of items in formular have to be used for precise computation and the circular constant has to calculate down the 13 places of decimals in order to obtain the precision of 1mm on the ground scale.
Enhanced Recovery of Gravity Fields from Dense Altimeter Data
Kim, Jeong-Hee ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 14, issue 2, 1996, Pages 127~139
This paper presents a procedure to recover sea surface heights (SSH) and free-air (FA) gravity anomalies from dense satellite altimeter SSH data with enhanced accuracies over the full spectrum of the gravity field. A wavenumber correlation filtering (WCF) of co-linear SSH tracks is developed for the coherent signals of sub-surface geological masses. Orbital cross-over adjustments with bias parameters are applied to the filtered SSH data, which are then separated into two groups of ascending and descending tracks and gridded with tensioned splines. A directional sensitive filter (DSF) is developed to reduce residual errors in the orbital adjustments that appear as track patterned SSH. Finally, FA gravity anomalies can be obtained by the application of a gradient filter on a high resolution estimate of geoid undulations after subtracting dynamic sea surface topography (DSST) from the SSH. These procedures are applied to the Geosat Geodetic Mission (GM) data of the southern oceans in a test area of ca.
to resolve geoid undulations and FA gravity anomalies to wavelengths of-10 km and larger. Comparisons with gravity data from ship surveys, predictions by least squares collocation (LSC), and 2 versions of NOAA's predictions using vertical deflections illustrate the performance of this procedure for recovering all elements of the gravity spectrum. Statistics on differences between precise ship data and predicted FA gravity anomalies show a mean of 0.1 mgal, an RMS of 3.5 mgal, maximum differences of 10. 2 mgal and -18.6 mgal, and a correlation coefficient of 0.993 over four straight ship tracks of ca. 1,600 km where gravity changes over 150 mgals.
Redefinition Procedures of the Korean Geodetic System
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 14, issue 2, 1996, Pages 141~150
A satellite positioning system has been recently introduced in Korea and the applications of the system are in-creasing gradually, and it is, therefore, interested in the geocentric coordinate system. In this paper, the requirements of the redefinition of the Korean geodetic system which is suited to the geocentric datum and the strategies for the establishment of new geodetic networks are considered. It is also taken into account to maintain the control points, in the transition from the old coordinate systems to a new coordinate system.
A study on Accuracy Improvement of Three-Dimension Terrain Modelling
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 14, issue 2, 1996, Pages 151~157
This study, experimentally, aims at presenting the methodology to construct an efficient digital terrain by com-paring and analyzing the accuracy among the existing Digital Terrain Models, develope 3-D fractal terrain model-ling program by applying digital algorithm of fractal geometry and using turbo pascal, and lastly perform basic research on constructing GSIS-based 3-D fractal terrain modelling system by integrating a PC-based GSIS Pack-age and the 3-D fractal terrain modelling program developed by this paper. The results are as follows -First, the method to produce TIN(Triangulated Irregular Network) by the combination of point data and line data was showed as an alternative to construct efficient Digital Terrain Model. Second, developing GSIS-based 3-D fractal terrain modelling system, applying fractal geometry is the basic research in developing the new terrain modelling method. also, this study presented the possibility of 3-D terrain modelling with the use of fractal.
Spatial Analysis of the Cultral Properties Using the Digital Informations
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 14, issue 2, 1996, Pages 159~166
It has the imfortant significance to study of 3 dimensional precision surveying and analysis system for conservation of culutral properties. This study is about to efficient precision surveying methods and analysis of digital information data for conservation of cultral properties. We acquire the photos and construct the 3 dimensional digital information in 1 n accuracy, and carry the spatial analysis to five story pagoda at Chongrimsa temple site of National Treasure No. 9 of Korea. In result, we carry the 3 dimensional modelling accurately and the efficient geometrical analysis of sections, calculation of the aera, volumn, and position and slope of con-trial axis. So, we expect efficient use of as well study of art history as safety diagonise for the preservation of cultural properties.
The advanced Algorithm of Ambiguity Function Method far Realtime Precise GPS Positioning
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 14, issue 2, 1996, Pages 167~179
The AFM (Ambiguity Function Method) is insensitive to the integer ambiguity and the presence of cycle slips in the carrier phase observations. But there are two significant problems with using the AM to determine GPS base-lines. The first problem is the long computation time required to determine the optim position. The second problem is that there may be sever maxima points that the AFM gorithm must discriminate between within the search volume in order to identify the optim position. A new gorithm which enables the AFM to be applied to the OTF (On-the-fly) environments by significantly shortening the computation time is proposed in this paper. In addition to it, sever statistic procedures which verify whether the optim position is true or not are proposed.
Geodetic Point Positioning using the GPS Csrrier Phase
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 14, issue 2, 1996, Pages 181~188
Geodetic Satellite Positioning Techniques (NNSS, Transit, Doppler, VLBI, SLR etc.) still have much difficulty in surveying and necessity of point positions is being amplified in korea. Therefore some research institutes have being investigated point positioning using the GPS. In this study, 1 arranged the theory deal with point positioning using GPS carrier beat phase of dual frequency and estimated corrections of errors that be included in GPS observable. Also, 1 determined point position by the differencing scheme of GPS carrier phase, and analyzed the accuracy of point position. 1 suggested potentiality of geodetic point positioning using GPS carrier phase by comparing result of relative positioning with result of point positioning and analyzing result of network adjustment fixed any point position.
Techniques for Measuring 3-D Positional Data of Terrain Features from Digital Satellite Imagery
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 14, issue 2, 1996, Pages 189~197
Digital Elevation Model, Ortho-image, and 3-D positional data of terrain features are indispensable elements for producing 3-D image information. In this research, digital pbotogrammetric studies were conducted to measure the 3-D positional data on high performance computer systems in order to replace analytical stereo-plotter-oriented tasks with those of digital workstations. Especially, technical approaches to measure these data on stereo workstation were developed and then the results were applied on SPOT satellite images. As the result of this study, the possibilities of the proposed technologies were tested and proved based on the ap-plication of the digital photogrammetric processes to extract 3-D ground coordinates of terrain features from digital satellite imagery.
A study on the Precision Improvement of Baseline Determination by Using the Precise Ephemeris of GPS Satellites
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 14, issue 2, 1996, Pages 199~207
According to the different baseline lengths, we quantitatively analyzed how much precision of the baseline de-termination is improved for GPS survey when using the precise ephemeris instead of the broadcast ephemeris of GPS satellites. For this research, we selected seven baselines ranging from 15 km to 201 km and performed GPS measurements more than six times for each baseline. The observed data for each baseline were processed two times with the same conditions alternately changing the broadcast and the precise ephemeris. The standard deviations from the repeated measurements for each baseline are compared between the results of using the broadcast ephemeris and the precise ephemeris. As the result, the precision, stability and reliability of the base-line determination using the precise ephemeris is better than those of using the broadcast ephemeris for all base-lines. When using precise ephemeris for the baselines longer than 65 km, the precision less than 0.1ppm is always obtained and the precision improvement rate by using the precise ephemeris is considerably greater than that for the shorter baselines. We expect that this result might be a quantative basis for the decision about what ephemeris is better for the baseline length and the demanded precision in GPS survey.
Positioning of Cadastral Control Points Using GPS
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 14, issue 2, 1996, Pages 209~218
This study aims to draw a technique for practical using of GPS surveying to decide the positions of cadastrial control points. GPS surveying is carried out at cadastrial triangulation points and supplementary control points. This paper includes characteristics of transformation of WGS84 into Tokyo datum, two dimensional solutions for GPS baseline vector, and combined solutions of both GPS and terrestrial data. As a results of this study, it is verifiable that GPS surveying is very efficient to check the existing control network. 2-D network adjustment technique using GPS baseline vector is applicable to Tokyo datum without coordinate transformation. And it is expected to improve efficiency by using either rapid-static or stop and go kinematic surveying in cadastrial surveying at small areas.
Study on Development of a Search Program for Surveying Related Papers in Korea and the Renewal of their List
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 14, issue 2, 1996, Pages 219~228
The list of the titles of surveying-related papers and books is updated by adding newly polished paper/book titles to the existing one. A special title-search program is developed for managing and searching the surveying-re-lated paper/book titles, and the database is established from the list of the papers. The total number of papers/books in surveying-related field published in Korea upto now is 971. The number of papers/books published in the specific fields are 206 in the conventional surveying field, 218 in Photogrammetry, 183 in Remote Sensing, 127 in Geodesy and GPS, and 237 in Digital Mapping and GIS. The special title-search program is developed using the Visual Basic 3.0 for Windows 3.1 to be operated in the Window environment. The SQL(Structured Query Language) is used for the searching commands.
A Study on the Shortening Effect of Train Running Time as Railway curve sections improvement
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 14, issue 2, 1996, Pages 229~239
for shortening of running time on existing line, speed up railways feel strongly the necessity of it, for fully realizing a role of transportation system, for human life style is high. and increasing of time value. Especially curved lines zone have crucial effects on the speed of train, in case the shortening of running time, it is thought, speed up in curved lines zone, considering a character of route alignment in korea, we obtain saving time using lateral force index for safety running of train and comfortable ride of passengers. The results of this study show that all curved zone improvements for the shortening of the train running time more efficiently than extension of transition curve.
A Study on Drawing and Analysis of the Highway Projection Drawing for Design of Highway Alignment
Keinosuke Matsui ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 14, issue 2, 1996, Pages 241~247
The most important factor in highway design is to match highway alignment with topography so that the driver can drive the vehicle safely and comfortably. Highway alignment design is completed with combination of horizontal alignment and vertical alignment that is harmony with topography at the last step. In highway alignment design, the use of continuous perspective can meet vehicle's physical requirements, which is useful to keep driver's psychological and physiological balance. The main purpose of this study is to develop a computer pro-gram which is applicable to highway alignment design through study of how to make and analyze perspective by means of computer.
A Study on Automated Production of Digital Cartographic Map by Electronic Tacheometer
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 14, issue 2, 1996, Pages 249~253
The development of electronic technology brings the advent of electronic tacheometer which measures, stores and records automatically angles and distances. Electronic tacheometer is the surveying equipment that enable the acquisition of the 3-D terrain information, construction of the database and automatic drafting of the cartographic map. This paper aims at studying the system which can produce automatically the digital cartographic map by us-ing the electronic tacheometer. For this study, cartographic maps of a region are produced by a plane table and an electronic tacheometer and these is analysed. The results of this study show that digital cartographic map by electronic tacheometer is much more accurate and efficient than cartographic map by plane table.