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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Korea Spatial Information Society
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Journal DOI :
The Korean Association of Geographic Inforamtion Studies
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Volume & Issues
Volume 15, Issue 4 - Dec 2007
Volume 15, Issue 3 - Nov 2007
Volume 15, Issue 2 - Jul 2007
Volume 15, Issue 1 - Apr 2007
Selecting the target year
Continuous Perspective Query Processing for 3D Objects on Road Networks
Kim, Joon-Seok ; Li, Ki-Joune ; Jang, Byung-Tae ; You, Jae-Joon ;
Journal of Korea Spatial Information Society, volume 15, issue 2, 2007, Pages 95~109
Recently people have been offered location based services on road networks. The navigation system, one of applications, serves to find the nearest gas station or guide divers to the shortest path based 2D map. However 3D map is more important media than 2D map to make sense friendly for the real. Although 3D map's data size is huge, portable devices' storage space is small. In this paper, we define continuous perspective queries to support 3D map to mobile user on road networks and propose this queries processing method.
Accuracy Enhancement using Network Based GPS Carrier Phase Differential Positioning
Lee, Yong-Wook ; Bae, Kyoung-Ho ;
Journal of Korea Spatial Information Society, volume 15, issue 2, 2007, Pages 111~121
The GPS positioning offer 3D position using code and carrier phase measurements, but the user can obtain the precise accuracy positioning using carrier phase in Real Time Kinematic(RTK). The main problem, which RTK have to overcome, is the necessary to have a reference station(RS) when using RTK should be generally no more than 10km on average, which is significantly different from DGPS, where distances to RS can exceed several hundred kilometers. The accuracy of today's RTK is limited by the distance dependent errors from orbit, ionosphere and troposphere as well as station dependent influences like multipath and antenna phase center variations. For these reasons, the author proposes Network based GPS Carrier Phase Differential Positioning using Multiple RS which is detached from user receiver about 30km. An important part of the proposed system is algorithm and software development, named DAUNet. The main process is corrections computation, corrections interpolation and searching for the integer ambiguity. Corrections computation of satellite by satellite and epoch by epoch at each reference station are calculated by a Functional model and Stochastic model based on a linear combination algorithm and corrections interpolation at user receiver are used by area correction parameters. As results, the users can obtain the cm-level positioning.
Accuracy Analysis of Target TS Surveying and Non-target TS Surveying for Building Registration of Cadastral Map
Hong, Sung-Eon ;
Journal of Korea Spatial Information Society, volume 15, issue 2, 2007, Pages 123~134
The building boundary should be registered in the cadastral map for the protection of property using the expansion of the registration items in the cadastral record and the construction of 3D-cadastral information system. In this study, the efficiency of registering the building boundary was suggested by non-target TS survey through the comparison between target TS and non-target TS survey about an accuracy and efficiency. At the result of this research, the RMSE of target TS and non-target TS survey is the X;
. Therefore, non-target TS survey shows the high accuracy. Also, the non-target TS survey is more efficient cost on time and personnel than target TS.
Distribution of Subgenus Lycoctonum in Korea: Analysis and Verification by GIS
Lee, Soo-Rang ; Jeong, Jong-Chul ; Park, Chong-Wook ;
Journal of Korea Spatial Information Society, volume 15, issue 2, 2007, Pages 135~146
The purpose of this study was to ascertain and analyze environmental factors of subgenus Lycoctonum in Korea for conservation and management of rare high land plant species by GIS. We derived the habitat model of Lycoctonum from GPS coordination, habitat factors and digital topology maps. Suitable altitude fur the subgenus Lycoctonum is from 470m to 1320m, and northern slopes(between 15.5 and 36 degrees) are ideal for the Lycoctonum populations. In addition to altitude, slope and aspect, deciduous forest and approximation to water source were found as important factor. Using GIS and the Lycoctonum habitat model, we overlaid elevation, aspect, slope and land cover layers and analyzed buffer from the water source on two topology maps, Yang-Soo and Mock-Dong. After making prediction map for Lycoctonum habitat, we verified the existence of Lycoctonum populations on the predicted sites through field survey. Through this research, we're convinced that GIS software is powerful tool for plants conservation, such as finding unknown habitat or selecting alternative habitat.
A Study on the Impact of Runoff Discharge by Developing in Upper Area
Kang, Sang-Hyeok ; Kim, Kyoung-Nam ;
Journal of Korea Spatial Information Society, volume 15, issue 2, 2007, Pages 147~158
Kangwon province has been suffering from the various types of disasters and these disasters stand In the way to sustainable development. The heavy rainfall by typhoon RUSA in 2002 damaged to property and bodily injury, and gave us a lesson. Even if the refuge activities plan by local government plan for disaster were established with rainfall event, it could not its role in practice. Beside it, the potential disaster risk remains still in existence because the disaster restoration work aims to original state. Therefore, in this study we focused on the point at issue of developing in upper area and its impact on discharge hydrograph.
The Runoff Characteristics due to Heavy Rainfall in Mountainous River
Kang, Sang-Hyeok ; Choi, Jong-In ; Park, Jong-Young ;
Journal of Korea Spatial Information Society, volume 15, issue 2, 2007, Pages 159~167
In this study, we investigated the application of extending the Huff's method to design discharge being used at present up to the event of concentrated rainfall. As our field study site, we selected Odae Cheon basin in Pheongchang, which was affected by concentrated rainfall in July 2006. Actual concentrated rainfall and design rainfall derived from the Huff's method were used to calculate the discharge and storm water levels, which were compared with the directly measured water-level marks of storm discharges. The results showed that the peak storm discharge from the torrential rainfall was twice higher than the design rainfall. The short term discharges from concentrated rainfall closely corresponded to the rainfall discharges of 150 years storm frequency.
A Comparative Study on the 3D Positioning Methods by CCD Images of The Mobile Mapping System
Jeong, Dong-Hoon ;
Journal of Korea Spatial Information Society, volume 15, issue 2, 2007, Pages 169~180
Applicability of Land-based MMS(Mobile Mapping System) having been increased gradually as digitalization of administrative operation and construction of integrated systems of the government and provincial government are growing up. As these requirements, the case can be occurred that the facilities should be surveyed rapidly in the specific area. At this case, the real time field processing method is more necessary than the post processing method and data processing speed should be an essential element as important as accuracy. In this study, the two space intersection methods used in photogrammetry were programmed and compared with each other to select more proper method for the three dimensional positioning in the field processing. Especially, at the analytic space intersection, the traditional close range terrestrial photogrammetry was modified and applied to that to adapt to MMS's characteristics that camera position and attitude are changed according to the vehicle movement. As a result, the difference of the accuracy between two methods is not significant but at the calculation time, the analytic space intersection is faster three times than the space intersection using collinearity condition.
Analysis of Ground Height from Automatic Correlation Matching Result Considering Density Measure of Tree
Eo, Yang-Dam ;
Journal of Korea Spatial Information Society, volume 15, issue 2, 2007, Pages 181~187
To make digital terrain data, automatic correlation matching by stereo airborne/satellite images has been researched. The result of automatic correlation matching has a limit on extracting exact ground height because of angle of sensor, tree of height. Therefore, the amount of editing works depend on the distribution of spatial feature in images as well as image quality. This paper shows that the automatic correlation matching result was affected by density and height of tree.