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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 17, Issue 4 - Dec 1999
Volume 17, Issue 3 - Sep 1999
Volume 17, Issue 2 - Jun 1999
Volume 17, Issue 1 - Mar 1999
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The Study on the Digital Orthophoto Generation and Improvement of it's Quality
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 17, issue 2, 1999, Pages 97~104
Digital elevation models(DEMs) represent an important data base for orthophoto generation The quality of a DEM depends on the geometrical accuracy of the original point or line data. This study analyzes the effects of grid space and scanning resolution in DEM creation with image matching method. The less standard deviation of DEM error was introduced when we adopted small grid space, but no effects in scanning resolution. Based on the bias error analysis of the DEM, we found that the error of a large scale of aerial photograph was bigger than that of a small scale case, and that such error mainly came from the closed area in large scale photographs. In order to reduce the closed area, the experiment has been conducted using multi scale and different overlap of aerial photo images. The result shows that the size of closed area and the shaded area has been dramatically decreased due to the adoption of multi scale aerial images instead of a couple of stereo images.
A Study on the Automation of Interior Orientation and Relative Orientation
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 17, issue 2, 1999, Pages 105~116
Owing to the rapid development of computer system and the introduction of image processing technique, recent photogrammetric studies have been concentrated on the automation of photogrammetric orientation work that have been carried out by skilled professionals in analog and/or analytical pbotogrammetric field. To automate the whole photogrammetric work, the automation of the orientation processes including interior, relative and absolute orientation should be preceded. This study aims to automate interior orientation and relative orientation process. For this purpose, we applied Hough transform to interior orientation process and object space matching technique to relative orientation process. As the result of this study, we can present a method to automate interior and relative orientation process that has been semi-automatically operated in most commercial digital photogrammetric workstations currently available.
A Study on The Improvement of Douglas-Peucker's Polyline Simplification Algorithm
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 17, issue 2, 1999, Pages 117~128
A Simple tree-structured line simplification method, which exactly follows the Douglas-Peucker algorithm, has a strength for its simplification index to be involved into the hierarchical data structures. However, the hierarchy of simplification index, which is the core in a simple tree method, may not be always guaranteed. It is validated that the local property of line features in such global approaches as Douglas-Peucker algorithm is apt to be neglected and the construction of hierarchy with no thought of locality may entangle the hierarchy. This study designed a new approach, CALS(Convex hull Applied Line Simplification), a) to search critical points of line feature with convex hull search technique, b) to construct the hierarchical data structure based on these critical points, c) to simplify the line feature using multiple trees. CALS improved the spatial accuracy as compared with a simple tree method. Especially CALS was excellent in case of line features having the great extent of sinuosity.
Estimating the Spatial Distribution of Satellite Image Classification Error Using Index of Spatial Distribution
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 17, issue 2, 1999, Pages 129~136
The quality of image classification results is not always uniform over entire image. Thus, this study proposes the concept of ISDd (Index of Spatial Distribution by distance) and ISDs (ISD by scatteredness) for the evaluation of unevenness of result quality, and spatial distribution of satellite image classification errors. The ISDd is indexed mean distance of misclassified pixels and the ISDs is statistical indicator of scatteredness of misclassified pixels. In this study, the ISDd and the ISDs are calculated and evaluated for some satellite images, then misclassified area is extracted and the reasons of misclassification are examined. As the result of this study, using both the ISDd and the ISDs, the basis of decision on adoption/rejection of classification results is offered at sub-image level by evaluation of the local aggregation of misclassified pixels. Using Index of Spatial Distribution. as well as overall classification accuracy, users can understand the spatial distribution of misclassified pixels, and can have the additional criterion of the judgement on suitability and reliability of classification results.
A study on the reduction of the distance on reference ellipsoid to the distance on geoid
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 17, issue 2, 1999, Pages 137~143
The straight spatial distance or geodesic distance on WGS84 ellipsoid measured by GPS should be reduced on geoid to be used in Korean Geodetic System. The factors for this reduction are geoidal height and mean radius of the earth. On this study the effects of these factors on reducing distance were analyzed and the result showed that mean geoidal height should be multiplied by
per unit distance for reducing geodesic distance on reference ellipsoid to that on geoid. Condsidering that the geoidal height on Bessel ellipsoid in Korea is -45 m in northeast and -75 m in middle west. It also showed that the difference of geodesic distance between on reference ellipsoid and on geoid is about 7-12 mm per km.
The Coordinates Computation of the GPS Base Station by Precise Point Positioning
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 17, issue 2, 1999, Pages 145~152
JPL(Jet Propulsion Laboratory) has been routinely produced the precise GPS ephemeris and clock's correction parameter using data collected from globally distributed permanent GPS tracking stations, and has been offering the automated GPS data analysis(Precise Point Positioning： PPP) service by using them. In this study, after investigating the potential capacity of JPL's PPP service, the coordinates computation of the GPS base station by this service were investigated. For this, the dual frequency P codes data of 24 hours were observed from continuously operating four reference stations in USA. sent to the JPL's main computer through E-mail and/or ftp, and then were processed by Gipsy/Oasis-II (GOA-II) software with the precise GPS transmitter parameters. Centimeter-level positioning results were available to obtain in X, Y, Z geocentric rectangular coordinate system.
A Study on Landscape Modeling based on Visibility using DTM
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 17, issue 2, 1999, Pages 153~160
On this study, We apply terrain analysis method using DTM(Digital Terrain Model) to mountainous district development to present the example of terrain-change modeling when we develop mountainous district, and the landscape-change modeling which is geographically referenced when a large scale utility was constructed on mountainous district. Finally, we present an one way which raise a efficiency of national land use and future oriented, environmentally friendly national land development.
A test on deformation detection ability of GPS
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 17, issue 2, 1999, Pages 161~166
The GPS ability for detecting the deformation is experimently tested by analyzing how precisely GPS can detect the true movement value of the GPS test bed with three axis. As the result, we found that GPS can detect the deformation with the precision of 2 mm in horizontal componts and 8 mm in vertical component for the short baseline of 16 km. The applicable possibilities of GPS for measuring the structure deformation are discussed on the base of this result.
The Digital Image Acquisition of High-resolution by Enhancing the Multiple Images
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 17, issue 2, 1999, Pages 167~176
The study about quantitative or qualitative analysis of object using digital image is being progressed actively with the development of the image medium and image process technique. But, it is very high that the dependency about image acquisition system of high resolution for image analysis of high accuracy and it is a equipment of high-price. In this study, I extracted the optimum condition of image enhancement by analyzing and enhancing the multiple images which were acquired by system of low-price. And I carried out the analysis of 3D accuracy by being applied the optimum condition of image enhancement. In the result of analysis of average 3D positioning error using law image and enhanced image which is acquired by applying the optimum condition of image enhancement, I could obtain the progressed accuracy about 10％ on the enhanced image.
The application of fuzzy spatial overlay method to the site selection using GSIS
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 17, issue 2, 1999, Pages 177~187
Up to date, in many application fields of GSIS, we usually have used vector-based spatial overlay or grid-based spatial algebra for extraction and analysis of spatial data. But, because these methods are based on traditional crisp set, concept which is used these methods. shows that many kinds of spatial data are partitioned with sharp boundary. That is not agree with spatial distribution pattern of data in the real world. Therefore, it has a error that a region or object is restricted within only one attribution (One-Entity-one-value). In this study, for improving previous methods that deal with spatial data based on crisp set, we are suggested to apply into spatial overlay process the concept of fuzzy set which is good for expressing the boundary vagueness or ambiguity of spatial data. two methods be given. First method is a fuzzy interval partition by fuzzy subsets in case of spatially continuous data, and second method is fuzzy boundary set applied on categorical data. with a case study to get a land suitability map for the development site selection of new town, we compared results between Boolean analysis method and fuzzy spatial overlay method. And as a result, we could find out that suitability map using fuzzy spatial overlay method provide more reasonable information about development site of new town, and is more adequate type in the aspect of presentation.
A Methodology for GIS Database Implementation using Fuzzy Maximum Likelihood Classification Products of Remotely Sensed Images
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 17, issue 2, 1999, Pages 189~196
Until now, Many approach to use the layer or attribute items in GIS the classification results of remotely sensed images is going on, but It was rarely ever tried to use the results of fuzzy classification in GIS. The fuzzy classification can be accurate than any other classification methods of remotely sensed images and can separately extract the result for each classification items. In this study, We applied to GIS database implementation with fuzzy classification result. In the process of this study, We convert the fuzzy classification image into the grid of GIS database, and Membership Grade Value files transformed to table database into the GIS. And then Membership Grade Values related to each grid-cell of database be able to verify with pointer layer. Finally, we can use the fuzzy classification images in GIS database.