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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 21, Issue 4 - Dec 2013
Volume 21, Issue 3 - Sep 2013
Volume 21, Issue 2 - Jun 2013
Volume 21, Issue 1 - Mar 2013
Selecting the target year
Development of Hydrographic Dredging Surveying and Construction Management System Based on Grab Dredger
Lee, Jin Duk ; Lee, Jae Bin ; Kim, Hyun Ho ;
Journal of Korean Society for Geospatial Information System, volume 21, issue 4, 2013, Pages 3~12
DOI : 10.7319/kogsis.2013.21.4.003
In order to evaluate dredging results scientifically the system which can manage and estimate working process by monitoring dredging process in real-time needs to be constructed. We constructed real-time dredging management system for guidance of a dredging vessel and for survey of dredging construction. This system was designed to have functions of dredger location by GPS, ship direction measurement by GPS/Gyroscope combination, Grab position measurement, dredging depth measurement and correction. In addition, we developed the programs for controlling and operating the constructed system. The system could induce the vessel to accurate position and conduct dredging according to plan and the effectiveness of the system was evaluated through the results of application to actual dredging construction site.
Design of Database and System for Application of Forest Biomass
Lee, Hyun Jik ; Koo, Dae Soung ; Ru, Ji Ho ;
Journal of Korean Society for Geospatial Information System, volume 21, issue 4, 2013, Pages 13~20
DOI : 10.7319/kogsis.2013.21.4.013
Due to the global warming, international agreements have been propelled by industrialized countries. These days, there are various studies and projects to reduce the carbon emission quantity in South Korea, because South Korea is a strong candidate for a newly industrialized nation by Kyoto Protocol. Therefore, this study arranges plans to create various thematic map by producing database that can manage various datum based on grid spatial objects to manage quantity of forest biomass and carbon dioxide. Moreover, this study designs a system to create forest biomass by using the best method of calculation with LiDAR data and KOMPSAT-2 satellite images. In addition, this study designs a biomass monitoring system for public institutions to register biomass, suggesting actual plans to extract, manage, and utilized forest biomass.
Vegetation Classification using KOMPSAT-2 Imagery and High-resolution airborne imagery in Urban Area
Park, Jeong Gi ; Go, Shin Young ; Cho, Gi Sung ;
Journal of Korean Society for Geospatial Information System, volume 21, issue 4, 2013, Pages 21~27
DOI : 10.7319/kogsis.2013.21.4.021
Recently, It is increasing that importance of systematic management by carbon sinks in forest resources. Especially, in terms of social, Forest resources in urban areas are important role as well as carbon sinks, and improvement of the natural environment of the city. In this study, through ANOVA analysis that a total of nine different vegetation index from rearranged NIR band of images to Forest tree species classified in urban areas using high-resolution aerial images and satellite images of KOMPSAT-2. And various vegetation indices such as NDVI are divided a species by forest units through statistical analysis. Also, separated species are compared to forest type map by the Forest Service. As a result, it is built as basis for vegetation management in urban areas.
Study of CO2 Absorption in Forest by Airborn LiDAR Data
Go, Sin Young ; Park, Jung Gi ; Cho, Gi Sung ;
Journal of Korean Society for Geospatial Information System, volume 21, issue 4, 2013, Pages 29~35
DOI : 10.7319/kogsis.2013.21.4.029
Generally, Calculation of carbon dioxide absorption in the forest area is calculated using the information of the forest, such as tree height and DBH(Diameter of Breast Height). Tree height and DBH of these are obtained using the remote sensing data such as imagery and information of local forest survey. However, Mixed forest with a high proportion of field survey to lower the accuracy of forest information. In this study, vertical structure of the tree were identified by applying region growing method based on the slope using LiDAR data and height and number of the tree were identified by applying extracting top of the tree algorithm. Through the vertex tree extraction algorithm to identify height of tree and the number of individuals, substitute this for the DBH relation formula which is drawn from data through field surveys. In this, a quantitative calculation of carbon dioxide absorption were able to calculate the basic data. Also, carbon dioxide absorption of three type trees were calculated and average per unit area of carbon dioxide absorption were able to estimate.
Study of Correlation Between Flash Flood and GcIUH Parameters using GIS
Yang, In Tae ; Park, Kheun ;
Journal of Korean Society for Geospatial Information System, volume 21, issue 4, 2013, Pages 37~44
DOI : 10.7319/kogsis.2013.21.4.037
Concentrated localized torrential rains due to global warming and climate change have resulted in much water damage each year. GIS is used as a tool for predicting the peak-outflows caused by these regional torrential rains in mountainous rivers. However, the research of the resolution of the data is limited, and most of approaches are about hydrological geographic. This paper estimates the flood discharge needed for decision of standard rainfall of automatic rainfall warning system by using GIS with GcIUH model, and establishes the criteria of flash flood warning. It also has analyzed the terrain in river basin, extracted the morphological characteristics parameters of water shed such as stream width, channel slope, channel length, shape factor, and GcIUH parameters, and analyzed the relationship between them.
Automatic Coastline Extraction and Change Detection Monitoring using LANDSAT Imagery
Kim, Mi Kyeong ; Sohn, Hong Gyoo ; Kim, Sang Pil ; Jang, Hyo Seon ;
Journal of Korean Society for Geospatial Information System, volume 21, issue 4, 2013, Pages 45~53
DOI : 10.7319/kogsis.2013.21.4.045
Global warming causes sea levels to rise and global changes apparently taking place including coastline changes. Coastline change due to sea level rise is also one of the most significant phenomena affected by global climate change. Accordingly, Coastline change detection can be utilized as an indicator of representing global climate change. Generally, Coastline change has happened mainly because of not only sea level rise but also artificial factor that is reclaimed land development by mud flat reclamation. However, Arctic coastal areas have been experienced serious change mostly due to sea level rise rather than other factors. The purposes of this study are automatic extraction of coastline and identifying change. In this study, in order to extract coastline automatically, contrast of the water and the land was maximized utilizing modified NDWI(Normalized Difference Water Index) and it made automatic extraction of coastline possibile. The imagery converted into modified NDWI were applied image processing techniques in order that appropriate threshold value can be found automatically to separate the water and land. Then the coastline was extracted through edge detection algorithm and changes were detected using extracted coastlines. Without the help of other data, automatic extraction of coastlines using LANDSAT was possible and similarity was found by comparing NLCD data as a reference data. Also, the results of the study area that is permafrost always frozen below
showed quantitative changes of the coastline and verified that the change was accelerated.
Accuracy Evaluation of the Height Determined by Network-RTK VRS Positioning
Lee, Suk Bae ;
Journal of Korean Society for Geospatial Information System, volume 21, issue 4, 2013, Pages 55~63
DOI : 10.7319/kogsis.2013.21.4.055
Network-RTK GPS positioning technique based on national CORS(Continuous Operating Reference Station) and wireless internet access as like VRS and FKP was developed to overcome the limitations of traditional RTK technique. In Korea, NGII(National Geographic Information Institute) provides network-RTK service based on 51 CORS and mobile internet network. The purpose of this study is the accuracy evaluation of the height determined by GPS VRS technique based on network-RTK, So, in this study GPS VRS positioning was accomplished through 1st level BM line located at Sancheong~Jinju and
level BM line located at Geochang~Sancheong and the average error of the each BM line was calculated as 2.15cm and 1.80cm respectively. This result shows that GPS VRS height positioning can be used in
and 4th public BM leveling and also work regulation is needed to apply the GPS VRS height positioning.
Power Law Exponent in Coastal Area of Northeastern Jeju Island for the Investigation of Wind Resource
Moon, Seo Jeong ; Ko, Jung Woo ; Lee, Byung Gul ;
Journal of Korean Society for Geospatial Information System, volume 21, issue 4, 2013, Pages 65~71
DOI : 10.7319/kogsis.2013.21.4.065
Wind shear means the variation of wind speed according to the height. Wind shear is the important factor affecting the energy production of wind turbines. Power Law is used to extrapolate wind speed data. Normally, a Power Law exponent of 0.143 is used and this is referred to as the 1/7th Power Law. The Power Law exponent is affected by atmospheric stability and surface roughness of the site. Thus, it is necessary to calculate the Power Law exponent of the site exactly for an accurate estimation of wind energy. In this study, wind resources were measured at the three Met-masts which were located in the coastal area of northeastern Jeju Island. The Power Law exponents of the sites were calculated and proposed using measured data. They were 0.141 at Handong, 0.138 at Pyeongdae, and 0.1254 at Udo. We compared annual energy productions which are calculated using a Power Law exponent of 0.143, the proposed value of the Power Law exponents for each site, and the measured data. As a result, the cases of calculating using the proposed values were more similar to the cases using the measured data than the cases using the 0.143 value. Finally, we found that the propsed values of the Power Law exponent are available to more accurately estimate wind resources.
Exploring NDVI Gradient Varying Across Landform and Solar Intensity using GWR: a Case Study of Mt. Geumgang in North Korea
Kim, Jun Woo ; Um, Jung Sup ;
Journal of Korean Society for Geospatial Information System, volume 21, issue 4, 2013, Pages 73~81
DOI : 10.7319/kogsis.2013.21.4.073
Ordinary least squares (OLS) regression is the primary statistical method in previous studies for vegetation distribution patterns in relation to landform. However, this global regression lacks the ability to uncover some local-specific relationships and spatial autocorrelation in model residuals. This study employed geographically weighted regression (GWR) to examine the spatially varying relationships between NDVI (Normalized Difference Vegetation Index) patterns and changing trends of landform (elevation, slope) and solar intensity (insolation and duration of sunshine) in Mt Geum-gang of North-Korea. Results denoted that GWR was more powerful than OLS in interpreting relationships between NDVI patterns and landform/solar intensity, since GWR was characterized by higher adjusted R2, and reduced spatial autocorrelations in model residuals. Unlike OLS regression, GWR allowed the coefficients of explanatory variables to differ by locality by giving relatively more weight to NDVI patterns which are affected by local landform and solar factors. The strength of the regression relationships in the GWR increased significantly, by showing regression coefficient of higher than 70% (0.744) in the southern ridge of the experimental area. It is anticipated that this research output will serve to increase the scientific and objective vegetation monitoring in relation to landform and solar intensity by overcoming serious constraints suffered from the past non-GWR-based approach.
Comparative Analyses of Land Appropriateness Degrees Based on the Basic and Alternative Indicators : Focused on Forest Areas Surrounding Management Zones in Chungcheongbuk-Do Jeungpyeong Counties
Lee, Jin Hang ; Kim, Kwang Ju ; Lee, Myoung Beom ; Lee, Man Hyung ;
Journal of Korean Society for Geospatial Information System, volume 21, issue 4, 2013, Pages 83~93
DOI : 10.7319/kogsis.2013.21.4.083
Land Suitability Assessment can help to evaluate whether to preserve or to develop through analysis of various land characteristics. So, the evaluation index and method are very important for making the best result. The principle objective of this dissertation is to identify effective method that can make up for the distortion of land suitability value in the forest bordering the management area. The objective area of this study is comparative flat Jeungpyeong-gun. The procedures of the study are as follows. First, implement land suitability assessment as the normal index on Guideline. Second, verify land suitability grade about the forest bordering the management area. The third, redo land suitability assessment as two alternative index on
Guideline. The fourth, identify effective method between normal index and alternative index. The results of this tests show that the development suitability value is higher than preservation suitability value in the forest bordering the management area near existing development area. For that reason, this study needed to use substitution index in order to make up for the weakness. The level of land price and distance from road were main considerations. Finally, the derivative model is as follows. The derivative model confirmed the best assessment method in the forest bordering the management area near existing development area.
Determination of Precipitable Water Vapor from Combined GPS/GLONASS Measurements and its Accuracy Validation
Sohn, Dong Hyo ; Park, Kwan Dong ; Kim, Yeon Hee ;
Journal of Korean Society for Geospatial Information System, volume 21, issue 4, 2013, Pages 95~100
DOI : 10.7319/kogsis.2013.21.4.095
Several observation equipments are being used for determination of the water vapor content and precipitable water vapor (PWV) because the water vapor is highly variable temporally and spatially. In this study, we used GNSS systems such as GPS and GLONASS in standalone and combined modes to compute PWV and validated their accuracy with respect to the results of other water-vapor monitoring systems. The other systems used were radiosonde and microwave radiometer, and the comparisons were convenient because all three systems were collocated at the test site. The differences of PWW were in the range of 0.6-3.4 mm in the mean sense, and their standard deviations were 1.0-3.8 mm. The relatively large difference of GNSS compared with the other two systems were believed to be caused by the fact that the GNSS antenna used in this study was the kind for which the international standard of phase center variations (PCV) calibration is not available. We expect better accuracy of PWV determination and improved availability of it through integrated data processing of GPS/GLONASS when an appropriate antenna with PCV correction model is used.
Automatic Co-registration of Cloud-covered High-resolution Multi-temporal Imagery
Han, You Kyung ; Kim, Yong Il ; Lee, Won Hee ;
Journal of Korean Society for Geospatial Information System, volume 21, issue 4, 2013, Pages 101~107
DOI : 10.7319/kogsis.2013.21.4.101
Generally the commercial high-resolution images have their coordinates, but the locations are locally different according to the pose of sensors at the acquisition time and relief displacement of terrain. Therefore, a process of image co-registration has to be applied to use the multi-temporal images together. However, co-registration is interrupted especially when images include the cloud-covered regions because of the difficulties of extracting matching points and lots of false-matched points. This paper proposes an automatic co-registration method for the cloud-covered high-resolution images. A scale-invariant feature transform (SIFT), which is one of the representative feature-based matching method, is used, and only features of the target (cloud-covered) images within a circular buffer from each feature of reference image are used for the candidate of the matching process. Study sites composed of multi-temporal KOMPSAT-2 images including cloud-covered regions were employed to apply the proposed algorithm. The result showed that the proposed method presented a higher correct-match rate than original SIFT method and acceptable registration accuracies in all sites.
Assessment of DEM Generated by Stereo C-band and X-band SAR images using Radargrammetry
Song, Yeong Sun ; Kim, Gi Hong ;
Journal of Korean Society for Geospatial Information System, volume 21, issue 4, 2013, Pages 109~116
DOI : 10.7319/kogsis.2013.21.4.109
To extract the 3D geometric information from SAR(Synthetic Aperture Radar) images, two different techniques, interferometric SAR and radargrammetry, have been widely used. InSAR is most widely used for the generation of precise DEM(Digital Elevation Model) until now. But, Interferometric SAR requires severe temporal correlation over areas covered with vegetation and high relief areas. Because radargrammetry is less sensible to temporal correlation, it can provide better results than interferometric SAR in certain, especially X-band SAR. In this paper, we assess the properties of DEMs generated by radargrammetry using stereo C-band RADARSAT-1 images and X-band TerraSAR-X images.
Accuracy Analysis of Network RTK Surveying for Cadastral Re-survey Project
Park, Chun Soo ; Park, Ki Heon ; Hong, Sung Eon ;
Journal of Korean Society for Geospatial Information System, volume 21, issue 4, 2013, Pages 117~123
DOI : 10.7319/kogsis.2013.21.4.117
The purpose of this research is to suggest the reasonable method of Network RTK surveying in future cadastral re-survey project through the accuracy analysis about Network RTK surveying achievement and the conventional TS-based confirmation surveying. To achieve it, we selected the experiment places and succeeded in achieving the result by Network RTK surveying about total of 307 parcel boundary point. We compared it with the result of confirmation surveying for cadastral, and it was shown that total connection errors of RMSE was
and total 48 places exceeded in the cadastral re-survey allowable error tolerance. The research suggested the practical alternatives in cadastral re-survey project after the comprehensive evaluation of those analysis results. Therefore, the author suggested development and adoptation of integrated electronic plane table surveying method. Moreover, we suggested unifying the first parcel boundary point method into the total station surveying and adopt the Network RTK surveying on the cadastral surveying inspection.
Study on Application Plan of Intelligent National Geospatial Data for Review of Unexecuted Urban Planning Facilities Infrastructure in Long-term
Choi, Seung Yong ; Lee, Hyun Jik ; Yang, Seung Ryong ;
Journal of Korean Society for Geospatial Information System, volume 21, issue 4, 2013, Pages 125~134
DOI : 10.7319/kogsis.2013.21.4.125
Since 2012, the local autonomous governments, under the recommendations regarding cancellation of local committees directing overly-unexecuted urban planning facilities, have tried to prove validity of such facilities. Factors such as specific standards of cancelation process, will execute policies, diversification of local conditions, connectivity to nearby facilities and possible arise of civil complaints, however, all hinder overly-unexecuted urban planning facilities from getting revitalized. Considering that these unexecuted facilities that local governments have to manage increase in number every year, the burden continuously increases for the governments due to the difficulty of setting aside budget for performing validity checks on such facilities. This research aims to analyze the criteria regarding efficient and systematic method on confirming validity of overly-unexecuted urban planning facilities, to establish into several different processes according to defined categories, and to objectify and quantify such standards. Also, using intelligent spatial information such as digital map, LiDAR data and ortho-images, spatial information analysis method suitable for reassessment was chosen and applied to execute validity analysis regarding overly-unexecuted urban planning facilities.
Application of Smart Geospatial Information for Modeling and Analysis of City River
Lee, Hyun Jik ; Eom, Jun Sik ; Yu, Young Geol ; Park, Eun Gwan ;
Journal of Korean Society for Geospatial Information System, volume 21, issue 4, 2013, Pages 135~142
DOI : 10.7319/kogsis.2013.21.4.135
This study aims to seek adequate and optimized method of applying high quality three-dimensional spatial data created via high-resolution digital aerial photograph image and aerial LiDAR data onto three-dimensional planning of environmentally friendly, ecological restoration of rivers in accordance with irrigation and flood control objectives of urban rivers. Through three-dimensional modeling of before and after the restoration, the research also offers basic information regarding restorations of rivers. Also the transition from the conventional two-dimensional planning into three-dimensional planning environment using smart spatial information acquire accuracy of river analysis, analyze possible civil complaints and suggest solutions to potential problems.
A Study of Developing Variable-Scale Maps for Management of Efficient Road Network
Joo, Yong Jin ;
Journal of Korean Society for Geospatial Information System, volume 21, issue 4, 2013, Pages 143~150
DOI : 10.7319/kogsis.2013.21.4.143
The purpose of this study is to suggest the methodology to develop variable-scale network model, which is able to induce large-scale road network in detailed level corresponding to small-scale linear objects with various abstraction in higher level. For this purpose, the definition of terms, the benefits and the specific procedures related with a variable-scale model were examined. Second, representation level and the components of layer to design the variable-scale map were presented. In addition, rule-based data generating method and indexing structure for higher LoD were defined. Finally, the implementation and verification of the model were performed to road network in study area (Jeju -do) so that the proposed algorithm can be practical. That is, generated variable scale road network were saved and managed in spatial database (Oracle Spatial) and performance analysis were carried out for the effectiveness and feasibility of the model.
Development of Building 3D Spatial Information Extracting System using HSI Color Model
Choi, Yun Woong ; Yook, Wan Man ; Cho, Gi Sung ;
Journal of Korean Society for Geospatial Information System, volume 21, issue 4, 2013, Pages 151~159
DOI : 10.7319/kogsis.2013.21.4.151
The building information should be up-to-date information and propagated rapidly for urban modeling, terrain analysis, life information, navigational system, and location-based services(LBS), hence the most recent and updated data of the building information have been required of researchers. This paper presents the developed system to extract the 3-dimension spatial information from aerial orthoimage and LiDAR data of HSI color model. In particular, this paper presents the image processing algorithm to extract the outline of specific buildings and generate the building polygon from the image using HIS color model, recursive backtracking algorithm and the search maze algorithm. Also, this paper shows the effectivity of the HIS color model in the image segmentation.