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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Association of Geographic Information Studies
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The Korean Association of Geographic Information Studies
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Volume & Issues
Volume 2, Issue 3 - Dec 1999
Volume 2, Issue 2 - Oct 1999
Volume 2, Issue 1 - May 1999
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A Basic Study of an Integrated Digital Map Generation to an Electronic Navigational Chart and a Digital Topographic Map for Coastal Development and Management
Yi, Gi-Chul ; Park, Chang-Ho ; Kim, Jeong-Hee ; Suh, Sang-Hyun ; Jeong, Hui-Gyun ; Choi, Joon-Young ;
Journal of the Korean Association of Geographic Information Studies, volume 2, issue 1, 1999, Pages 1~11
The Korean government is developing a systematic plan of integrated coastal management for effective conservation, utilization, and development of coastal areas. For this plan, integrated maps of land maps and nautical charts are indispensable. However, these maps are not made, nor studied yet in terms of integration, although digital maps(DM) on land and electronic nautical charts(ENC) have been recently developed by Korean Geography Institute and National Marine Investigation Institute, respectively. In this study, as preliminary studies to make eventual integrated maps, the concept of coastal areas are defined, specifically, coastal lines from DM and ENC are matched against each other. Issues on map production procedures, coordinate systems, and map projections, are carefully considered. A test coastal area located in Seo-Gu, Pusan, over 14 km of coastal lines is selected for the edge matching of coastal lines. RMS differences are 13.83 m and 4.37 m over man-made coastal lines and natural coast lines, respectively, which are quite larger considering a scale difference and other factors. However, no systematic differences are found.
Signal Treatement for Topex/Poseidon Satellite Altimetric Data and Its Application near the Korean Seas
Yoon, Hong-Joo ;
Journal of the Korean Association of Geographic Information Studies, volume 2, issue 1, 1999, Pages 12~31
Topex/Poseidon satellite altimetric data are used to estimate characteristics on the oceanic and atmospheric correction factors, and the mean sea level and its variations in the Yellow Sea, the East China Sea and the East Sea from September 1992 through August 1994(70cycles). For the atmospheric correction factors, the variations of dry troposphere, humid troposphere, ionosphere and inverted barometer were very small as a few centimeters, but the variations of electromagnetic bias were higher than other factors. For the oceanic correction factors, the variations of ocean tide(35cm in track 127 and 60cm in track 214) showed high ranges compared to elastic tide(5cm in track 127 and 1cm in track 214) and loading tide(1.8cm in track 127 and 1cm in track 214). It should be understood that the variations of ocean free surface is mainly under the influence of, firstly, ocean tide and, secondly, electromagnetic bias. Mean sea level in the Yellow Sea are higher than in the rest of Seas. Then its range generally comprised between -60cm and 210cm with mean value of about 100cm. Also its variations showed high values in the Yellow Sea and East China Sea, especially 5.689cm in Youngampo. This result is mainly due to the effects of local topography and tidal current.
An Evaluation of the Use of the Texture in Land Cover Classification Accuracy from SPOT HRV Image of Pusan Metropolitan Area
Jung, In-Chul ;
Journal of the Korean Association of Geographic Information Studies, volume 2, issue 1, 1999, Pages 32~44
Texture features can be incorporated in classification procedure to resolve class confusions. However, there have been few application-oriented studies made to evaluate the relative powers of texture analysis methods in a particular environment. This study evaluates the increases in the land-cover classification accuracy of the SPOT HRV multispectral data of Pusan Metropolitan area from texture processing. Twenty-four texture measures were derived from the SPOT HRV band 3 image. Each of these features were used in combination with the three spectral images in the classification of 10 land-cover classes. Supervised training and a Gaussian maximum likelihood classifier were used in the classification. It was found that while entropy produces the best empirical results in terms of the overall classification, other texture features can also largely improve the classification accuracies obtained by the use of the spectral images only. With the inclusion of texture, the classification for each category improves. Specially, urban built-up areas had much increase in accuracy. The results indicate that texture size 5 by 5 and 7 by 7 may be suitable at land cover classification of Pusan Metropolitan area.
A Consideration of the Optimal Thinning Algorithm For Contour Line Vectorizing in the Geographic Information System
Won, Nam-Sik ; Jeon, Il-Soo ; Lee, Doo-Han ; Bu, Ki-Dong ;
Journal of the Korean Association of Geographic Information Studies, volume 2, issue 1, 1999, Pages 45~53
Geographic Information System(GIS) which facilitates efficient storage and retrieval of geographic information is very useful tools. It is of extreme importance to develop automated vectorizing system as input method for GIS, because it takes a large amount of time and effort in constructing a GIS. In all kinds of map processed by GIS, contour line map specially takes a large amount of effort. In this paper we have considered an optimal thinning algorithm for the contour line vectorizing in the GIS. Based on the experimental results, it has been proved that thinning algorithm using the connection value is most excellent algorithm in the similarity and connectivity.
A Consideration of the Optimal Thinning Algorithm for Cadastral Map Vectorizing
Won, Nam-Sik ; Kim, Kwon-Yang ;
Journal of the Korean Association of Geographic Information Studies, volume 2, issue 1, 1999, Pages 54~62
Vectorizing for input processing of map is the most time and cost consuming task, and the quality of vector data depends on that processing result. Therefore, it is an important task to develop a good vectorizing system in the GIS. Thinning algorithm is the most important technology for deciding the quality of vector data in the vectorizing system. In this paper, as a suitable algorithm for map vectorizing we considered several algorithms that preserve topological and geometric characteristics, and have no distortion of the contour line. As a results, we implemented WPTA4 and well known thinning algorithm, and compared WPTA4 execution results with the others.
A Study on Developing GIS User Interface using OLE Automation
Bu, Ki-Dong ;
Journal of the Korean Association of Geographic Information Studies, volume 2, issue 1, 1999, Pages 63~72
This study proposes an easy method to develope user interfaces for the GIS using OLE automation. In the developing stage of user interface, the most important thing is to make the best use of effective windows programming techniques and component software supporting techniques. Using the OLE automation and Visual Basic programming, the study constructs an user interface as case study which performs map overlaying, referencing attribute tables, graph analysis, drawing up of thematic map.
Detecting Land Use Changes in an Urban Area using LANDSAT TM and JERS-1 OPS Imagery
Lee, Jin-Duk ; Yeon, Sang-Ho ; Ryu, Jae-Yup ; Kim, Sung-Gil ;
Journal of the Korean Association of Geographic Information Studies, volume 2, issue 1, 1999, Pages 73~83
The land use/cover information, which is periodically obtained from satellite imagery, can be effectively applied to change detection in rapidly changing urban areas. Also it can be used not only as base maps for spatial database in urban information system but as decision-making data for desired urban planning and development direction. In this study, we carried out both unsupervised and supervised classification on land use from Landsat TM and JERS-1 OPS data, which were collected respectively in 1991 and 1997, covering Kumi City and then detected land use changes.