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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 15, Issue 4 - Dec 2007
Volume 15, Issue 3 - Sep 2007
Volume 15, Issue 2 - Jun 2007
Volume 15, Issue 1 - Mar 2007
Selecting the target year
Automatic Generation of 3D Building Models using a Draft Map
Kim, Seong-Joon ; Min, Seong-Hong ; Lee, Dong-Cheon ; Park, Jin-Ho ; Lee, Im-Pyeong ;
Journal of Korean Society for Geospatial Information System, volume 15, issue 2, 2007, Pages 3~14
This study proposes an automatic method to generate 3D building models using a draft map, which is an intermediate product generated during the map generation process based on aerial photos. The proposed method is to generate a terrain model, roof models, and wall models sequentially from the limited 3D information extracted from an existing draft map. Based on the planar fitting error of the roof corner points, the roof model is generated as a single planar facet or a multiple planar structure. The first type is derived using a robust estimation method while the second type is constructed through segmentation and merging based on a triangular irregular network. Each edge of this roof model is then projected to the terrain model to create a wall facet. The experimental results from its application to real data indicates that the building models of various shapes in wide areas are successfully generated. The proposed method is evaluated to be an cost and time effective method since it utilizes the existing data.
Investigation of Shoreline Change by Photogrammetric Method
Lee, Chang-Kyung ; Kim, Baeck-Oon ; Kim, Nam-Yong ;
Journal of Korean Society for Geospatial Information System, volume 15, issue 2, 2007, Pages 15~23
This paper presents a shoreline change analysis on a reclaimed land, using a pair of aerial photographs taken before and after the reclamation. Shorelines that are defined by a tide datum, i.e. Approximately Highest High Water Level, were mapped by both analytical and digital photogrammetric methods. The past shorelines were overlapped with digital cadastral map from which areas of retracted and protruded lands were computed. Magnitude of shoreline changes was estimated by calculating areas between the past and present shorelines. Comparisons in terms of areas showed a fairly good agreement between the two methods. However, particularly in the estuary of complex morphology, shoreline mapping by digital photogrammetric method requires images to be scanned at a resolution higher than 1200 dpi.
Optimum Scale Evaluation of Sedment Basin Design by Soil Erosion Estimation at Small Basin
Lee, Sang-Jin ; Choi, Hyun ; Kwak, Young-Joo ; Lee, Bae-Sung ;
Journal of Korean Society for Geospatial Information System, volume 15, issue 2, 2007, Pages 25~31
The recent frequent heavy rainfall has caused an increased in soil erosion and the soil drain which drained soil has caused decreased in channel radius and environmental problems by turbidity. In this study, the optimum size of the sediment basin was tested with soil erosion estimated from the Universal Soil Loss Equation (USLE) in the basin using by GIS data. The results show that the estimated soil erosion and the designed soil deposit are
respectively and the size of sediment basin is proper. In this study the water depth was calculated from the Hec-Ras model to test the stability of the bank and to prove submersion of the inside fields from stream overflow.
Impacts of Surface Roughness Integration Using Remote Sensing Data: Concentration of Flood Flow Variation
Kang, Shin-Uk ; Rieu, Seung-Yup ; Lee, Kil-Ha ; Hwang, Man-Ha ;
Journal of Korean Society for Geospatial Information System, volume 15, issue 2, 2007, Pages 33~42
A physical-based aggregation method was suggested to estimate surface roughness, which adequately represents the spatial heterogeneity of vegetation factors, from land cover property obtained from the remote sensing data. For the sensitivity analysis of surface roughness, the peak flow, peak time, and total volume were simulated by the NWS-PC. Effects of surface roughness estimated by three different integration methods (predominant, arithmetic mean, and aggregation approach) on the conceptual rainfall-runoff model parameters was analyzed. In the preliminary sensitivity test to surface roughness, the peak time had 10% variation and total volume had 2% variation. The peak time increased with surface roughness. A physical-based aggregation method was better than the existing method in the Soyanggang Dam basin for the results of STDEV, RMSE, NSE, and PME, but difference between them were small. The parameters related on the total baseflow were changed significantly with change of the surface roughness.
A Study on the Application of Fuzzy membership function in GIS Spatial Analysis - In the case of Evaluation of Waste Landfill -
Lim, Seung-Hyeon ; Hwang, Ju-Tae ; Park, Young-Ki ; Lee, Jang-Choon ;
Journal of Korean Society for Geospatial Information System, volume 15, issue 2, 2007, Pages 43~49
In this study, a GIS spatial analysis method adopted fuzzy concept was introduced and land suitability analysis of waste landfill were conducted through this method. Previous studies conducted site evaluation and land suitability analysis by appling spatial overlay of conventional GIS that based on the boolean logic of crisp set. However these method can not consider the uncertainty of spatial data and the incongruity of data classification criteria, because these method handle spatial data based on the boolean logic of crisp set. As not provided trustable analysis result, conventional GIS spatial overlay method lacks opportunity for expanding use in reality. This study selected waste landfill as facility for analysis and applied fuzzy spatial analysis method as an objective approach. In the concrete contents of study, a series process with regard to the definition procedure of membership function for continuous data and the fuzzy input value generation of spatial data for fuzzy analysis is established. As a result, in this study we proposed a method that derive parameters for deciding the membership function of spatial data by considering the criterion of data classification and factor selection for land suitability analysis of waste landfill.
A Study on the Spatial Determination of Red Tide Occurrence Area Using GSIS
Kim, Jin-Gi ;
Journal of Korean Society for Geospatial Information System, volume 15, issue 2, 2007, Pages 51~57
Few researches related to the spatial determination of areas where red tide occurs have been performed, so accurately determining the area where red tide occurs and disappears poses difficulties. Therefore, a more objective and scientific method is necessary to analyze the occurrence and movement of red tide based on a geo-spatial information system. In this study, the coastline was extracted using a digital topographic map in order to examine areas where red tide occurs each year. An analysis of red tide occurrence areas, which were determined based on red tide data for the last several years, showed that only Yeoja bay had almost a zero case of red tide of the areas studied, whereas Dolsando in the South Sea and NamHaedo Aenggang bay areas exhibited the highest frequency of red tide occurrences. Based on these results, by using a system that determines the geo-spatial distribution status of areas repeatedly hit by red tide every year, it would be possible to predict the course of red tide and prevent consequent damages.
Efficiency Evaluation of Contour Generation from Airborne LiDAR Data
Wie, Gwang-Jae ; Lee, Im-Pyeong ; Kang, In-Gu ; Cho, Jae-Myoung ;
Journal of Korean Society for Geospatial Information System, volume 15, issue 2, 2007, Pages 59~66
The digital working environment and its related technology have been rapidly expanding. In the surveying field, we have changed from using optical film cameras and plotters to digital cameras, multi sensors like GPS/INS etc,. The old analog work flow is replaced by a new digital work flow. Accurate data of the land is used in various fields, efficient utilization and management of land, urban planning, disaster and environment management. It is important because it is an essential infrastructure. For this study, LiDAR surveying was used to get points clouds in the study area. It has a high vegetation penetrating advantage and we used a digital process from planning to the final products. Contour lines were made from LiDAR data and compared with national digital base maps (scale 1/1,000 and 1/5,000). As a result, the accuracy and the economical efficiency were evaluated. The accuracy of LiDAR contour data was average
and showed high ground detail in complex areas. Compared with 1/1,000 scale contour line production when surveying an area over
, approximately 48% of the cost was reduced. Therefore we prepose LiDAR surveying as an alternative to modify and update national base maps.
Tunnel Convergence and Crown Settlement Using 3D Laser Scanning
Lee, Jae-One ; Yun, Bu-Yeol ;
Journal of Korean Society for Geospatial Information System, volume 15, issue 2, 2007, Pages 67~75
There are a number of risks in constructing tunnel-structures. Therefore, the precise and rapid observation about inside deformation of the tunnel is required to prevent these risks from occurring and to secure safety. But currently, the real situation is that the crown settlement, cavity deformation and ground surface settlement rely upon the universal mensuration which uses total station or various kinds of measuring instruments. Recently, according to improvement and progress of measuring technology, three-dimensional laser scanning is used as the method to provide data for maintaining structures. It solves the reliability problem of measuring method for the transformational volume of existing structures, provides data that enables to judge visually by three-dimensioning the shape change of structures and makes it possible to deliberate speedy countermeasure. And it can also be efficiently used in the structure maintenance and field measurement.
Qualitative Analysis of Coast Topographic Using RTK-GPS
Kim, Yong-Suk ; Lee, Jae-One ;
Journal of Korean Society for Geospatial Information System, volume 15, issue 2, 2007, Pages 77~85
According to the survey data during the Japanese Occupation Period, the length of South Korea's coastline is about 11,542 km, including the coastlines of land and islands. It will be very expensive and time-consuming to revise/renew accurately this coastline data through site survey, it will cost great money and time. Also, various development projects such as reclamation works on public waters, constructions of ports/harbors, etc. are frequently changing the coastal areas and coastlines, causing many renewal projects on coastal maps. For such reason, appropriate alternatives for site survey are necessary. This paper demonstrate the utilization of RTK-GPS survey data, qualitative analysis and 3D topographic analysis for extracting the change in five coastal areas (Songjeong, Haeundae, Kwanganri, Songdo and Dadaepo). The local experimental areas subjected for this research were limited to five coastal areas near Busan.
GIS Based Real-Time Transit Information Integration and Its Transit Planning Implications
Hwang, Da-Hae ; Kim, Dong-Young ; Choi, Yun-Soo ; Cho, Seong-Kil ;
Journal of Korean Society for Geospatial Information System, volume 15, issue 2, 2007, Pages 87~93
Over the years, Advanced Public Transportation System (APTS) has been implemented to manage and operate public transportation system. With the expanding mass spatio-temporal data such as comprehensive spatial information of each individual passenger and public transportation vehicle, it has been required to consolidate and analyze these multiple data sets from various sources. This paper demonstrates how GIS is utilized for the consolidation of massive transit related spatio-temporal information. And it presents effective applications to improve transit planning process and support transit related decision-making activities. GIS based system is used to combine multi-agents' data in the areas of transit operation and individual transit ride and transfer management. Due to the unique comprehensiveness and the level of detail of the data provide by the Seoul Transit system, this GIS based information consolidation is the first in its class. Based on the integrated database, this paper describes the effective and efficient GIS based analysis deployed in a transportation system planning process. The data integration systems and analytic models developed in this paper can be transferred and applied by any municipal governments provided that the appropriate data is available.