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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Korean Society for Geospatial Information System
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Journal DOI :
The Korean Society for Geospatial Information System
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Volume & Issues
Volume 7, Issue 1 - Sep 1999
Volume 7, Issue 2 - Jun 1999
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Establishing GPS network for the Perception of Diastrophism in Korea
Kang, Joon-Mook ; Song, Seung-Ho ; Lee, Young-Wook ; Choi, Jong-Hyun ;
Journal of Korean Society for Geospatial Information System, volume 7, issue 1, 1999, Pages 11~20
To establish the basis of GPS network for the perception of diastrophism, we slected 7 stations(baseline
) all around south Korea considering the earthquake and the satellites all-in-view. As a result of periodical measurement, the change of relative positions between selected stations in Korea was very small. We could know that the baseline between Korea and Japan are decreasing by a few centimeters, as one of the results of analysing baseline vector changes by continuous measuring IGS stations and Korea(KAMC) station.
A Study on the Integrated Use of Digital Topographic Maps and Image Data
Kim, Kye-Hyun ; Lee, Kyong-Suk ; Jin, Heui-Chae ;
Journal of Korean Society for Geospatial Information System, volume 7, issue 1, 1999, Pages 21~28
NGIS and other related public projects have contributed to the generalized use of the digital maps. The accuracy and cost-effectiveness of such digital maps can be enhanced from the integrated use with airphotos and satellite imagery. This study mainly focuses on the investigation of a efficient way of integrating the digital map and image data along with searching for a proper standard format for the easier distribution of image data. This includes a thorough investigation of the available oversea image data-DoQ, DEM, DRG-and exisiting data transfer format such as widely used Geo TIFF and BIIF, supported by ISO. Also, major advantages and problems from integrating both data have been discussed to seek alternatives. The major conclusion from the study includes the need for more supports to activate the use of image data by policy-makers and the establishment of standards towards BIIF considering the accuracy, exchangeability, and trends.
Hypothesis Tests For Performances of a New Spline Interpolation Technique
Yu, Ki-Yun ;
Journal of Korean Society for Geospatial Information System, volume 7, issue 1, 1999, Pages 29~40
In vector GIS, natural linear entities (called linear entitles) are usually represented by a set of line segments. As an alternative of the line segments, curve segments can be used to represent the linear entities. The curve segments, as one-dimensional spatial objects, we generated by spline interpolation technique such as Bezier technique. In an effort to improve its accuracy in resembling the linear entities, the Bezier technique was modified generating a new technique (called New technique) (Kiyun, 1998). In this paper, validity of the New technique was tested. Test focused on answering two questions: (1) whether or not the curve segments from the New technique replace line segments so as to enhance the accuracy of representations of linear entities, and (2) whether or not the curve segments from the New technique represent the linear entities more accurately than curve segments from the Bezier technique. Answering these two questions entailed two hypothesis tests. For test data, a series of hydrologic lines on 7.5-minute USGS map series were selected. Test were done using t-test method and statistical inferences were made from the results. Test results indicated that curve segments from both the Bezier and New techniques represent the linear entities more accurately than the line segments do. In addition, curve segments from the New technique represent the linear entities more accurately than the line segments from the Bezier technique do at probability level 69% or higher.
Correcting Inconsistency on the Boundary of Neighboring Maps
Kim, Won-Tae ; Kim, Hak-Cheol ; Li, Ki-Joune ; Ahn, Byeung-Ik ; Kim, Seung-Ryong ;
Journal of Korean Society for Geospatial Information System, volume 7, issue 1, 1999, Pages 41~52
In order to correct mismatches between neighboring digital maps, the middle line method has been widely used. However, it may result in not only a corruption of the topological consistency between the objects near to boundaries but also degeneration of accuracy. In this paper, we propose two edge-matching methods to overcome the problem of the middle line method. The first method is based on the rubber sheeting, which performs an elastic transformation for the objects located around the boundaries. The second method transforms the geometry of objects by the function of the distance from the boundary. These methods have important advantages that they preserve the topology of the original maps and improve tile accuracy, compared with the previous methods.
A Study on the Integrated System Implementation of Close Range Digital Photogrammetry Procedures
Yeu, Bock-Mo ; Lee, Suk-Kun ; Choi, Song-Wook ; Kim, Eui-Myoung ;
Journal of Korean Society for Geospatial Information System, volume 7, issue 1, 1999, Pages 53~63
For the close range digital photogrammetry, multi-step procedures should be embodied in an integrated system. However, it is hard to construct an Integrated system through conventional procedural processing. Using Object Oriented Programming(OOP), photogrammetric processings can be classified with corresponding subjects and it is easy to construct an integrated system lot digital photogrammetry as well as to add the newly developed classes. In this study, the equation of 3-dimensional mathematic model is developed to make an immediate calibration of the CCD camera, the focus distance of which varies according to the distance of the object. Classes for the input and output of images are also generated to carry out the close range digital photogrammetric procedures by OOP. Image matching, coordinate transformation, dirct linear transformation and bundle adjustment are performed by producing classes corresponding to each part of data processing. The bundle adjustment, which adds the principle coordinate and focal length term to the non-photogrammetric CCD camera, is found to increase usability of the CCD camera and the accuracy of object positioning. In conclusion, classes and their hierarchies in the digital photogrammetry are designed to manage multi-step procedures using OOP and close range digital photogrammetric process is implemented using CCD camera in an integrated System.
The Precision 3D Monitoring to Preserve the Cultural Properties
Nym, Young-Bin ; Lee, Kook-Moo ; Bae, Sang-Ho ;
Journal of Korean Society for Geospatial Information System, volume 7, issue 1, 1999, Pages 65~74
The construction of precise digital data and analysis system is very important to fundamental data to preserve and repair cultural properties. This study is about to acquire of digital data and to construct of analysis system for efficient maintenance of cultural properties. On the chinaware with white slip and greyish-green glaze acquiring 3D digital data and carrying the spatial analysis and monitoring were done through the softcopy photogrammetry method. So, we intend to offer the efficient method to preserve cultural properties.
A Study on the Extraction of Building for three dimensional city model
Cha, Young-Su ; Kim, Yong-Il ; Eo, Yang-Dam ; Lee, Byung-Kil ;
Journal of Korean Society for Geospatial Information System, volume 7, issue 1, 1999, Pages 75~86
Three dimensional city model is composed of man-made and natural features, among these, most of man-made features are buildings. Therefore, it is very important to extract the building informations accurately and promptly to update the existing database. To achieve this, DTM can be reconstructed using building Information which is extracted from DTM, then this can be used as three dimensional city model. Thus, this paper aims to extract building boundaries and heights from high resolution DTM and edge informations of aerial photograph using mathematical morphology and image segmentation. We found that it is possible to extract buildings using opening operation in mathematical morphology and to improve the accuracy of building extraction using edge informations from aerial photograph.
An Analysis of the Landuse Classification Accuracy Using PCA Merged Images from IRS-1C PAN Data and Landsat TM Data
Ahn, Ki-Won ; Lee, Hyo-Sung ; Seo, Doo-Chun ; Shin, Sok-Hyo ;
Journal of Korean Society for Geospatial Information System, volume 7, issue 1, 1999, Pages 87~95
The min object of this study was to prove the effectiveness of PCA(principal component analysis) merged images produced by PCA method using high resolution IRS-1C PAN data and multispectral Landsat TM data A sample data which has ten classes was generated for evaluation of the overall classification accuracy. In result, merged sample image which TM13457 bands with IRS-1C PAN data by PCA method showed best result (95.1%). Especially, the largest improve (6.2%) in classification accuracy was resulted when IRS-1C PAN data was merged with TM123457 or TM13457 images. In addition, landuse classification accuracy of the PCA merged images was improved (5.16%) than original color composite images of Landsat TM data.