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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 19, Issue 4 - Dec 2011
Volume 19, Issue 3 - Sep 2011
Volume 19, Issue 2 - Jun 2011
Volume 19, Issue 1 - Mar 2011
Selecting the target year
Approach for Suitable Site Selection and Analysis for Reforestation CDM using Satellite Image and Spatial Data in North Korea
Yoo, Seong-Jin ; Lee, Woo-Kyun ; Lee, Seung-Ho ; Kim, Eun-Sook ; Lee, Jong-Yeol ;
Journal of Korean Society for Geospatial Information System, volume 19, issue 3, 2011, Pages 3~11
The objective of this study was to select appropriate sites for reforestation CDM using satellite image and spatial data in North Korea. A suitable site for reforestation CDM can be defined as non-forest area since 1990. To detect land cover change between two different years and to delineate potential reforestation CDM site(unstocked forest, converted crop land, denuded bare land), Landsat TM satellite image which was scanned in 1988 and SPOT Pan-sharpened image which was scanned in 2007 were used. As a result of classification, 1,214 ha of forest area in 1989 had been converted to other land cover types in 2007. and 2,245 ha of the total study area was detected to be suitable for reforestation CDM. 79.2% of total potential CDM sites was converted crop land. Through topography and accessibility analysis for potential reforestation CDM sites detected by satellite image, suitability index was calculated and the potential reforestation area was reclassified into suitability grades.
Design and Implementation of Moving Object Model for Nearest Neighbors Query Processing based on Multi-Level Global Fixed Gird
Joo, Yong-Jin ;
Journal of Korean Society for Geospatial Information System, volume 19, issue 3, 2011, Pages 13~21
In mobile environment supporting mobility technologies, user requirements have been increased with respect to utilization of location information. In particular, moving object DBMS has consistently posed in order to efficiently maintain traffic information related to location of vehicle which tents to tremendously change over time. Despite the fact that these sorts of researches must be taken into consideration, empirical studies on moving object in terms of map database for lbs service, spatial attribute of which is continuously changed over time, have rarely performed. Therefore, aim of this paper is to suggest efficient spatial index scheme, which is capable of supporting query processing algorithm and location of moving object over time, by developing new empirical model. As a result, we can come to the conclusion that moving object model based on multi-fixed grid index makes it possible to cut down on the number of entity for retrieving. What's more, this model enables hierarchical data to be accessed through efficient spatial filtering on large-scale lbs data and constraints in accordance with level in order to display map.
Extraction of Soil Wetness Information and Application to Distribution-Type Rainfall-Runoff Model Utilizing Satellite Image Data and GIS
Lee, Jin-Duk ; Lee, Jung-Sik ; Hur, Chan-Hoe ; Kim, Suk-Dong ;
Journal of Korean Society for Geospatial Information System, volume 19, issue 3, 2011, Pages 23~32
This research uses a distributed model, Vflo which can devide subwater shed into square grids and interpret diverse topographic elements which are obtained through GIS processing. To use the distributed model, soil wetness information was extracted through Tasseled Cap transformation from LANDSAT 7
satellite data and then they were applied to each cell of the test area, unlike previous studies in which have applied average soil condition of river basin uniformly regardless of space-difference in subwater shed. As a resut of the research, it was ascertained the spatial change of soil wetness is suited to the distributed model in a subwater shed. In addition, we derived out a relation between soil wetness of image collection time and 10 days-preceded rainfall and improved the feasibility of weights obtained by the relation equation.
The Landslide Probability Analysis using Logistic Regression Analysis and Artificial Neural Network Methods in Jeju
Quan, He Chun ; Lee, Byung-Gul ; Lee, Chang-Sun ; Ko, Jung-Woo ;
Journal of Korean Society for Geospatial Information System, volume 19, issue 3, 2011, Pages 33~40
This paper presents the prediction and evaluation of landslide using LRA(logistic regression analysis) and ANN (Artificial Neural Network) methods. In order to assess the landslide, we selected Sarabong, Byeoldobong area and Mt. Song-ak in Jeju Island. Five factors which affect the landslide were selected as: slope angle, elevation, porosity, dry density, permeability. So as to predict and evaluate the landslide, firstly the weight value of each factor was analyzed by LRA(logistic regression analysis) and ANN(Artificial Neural Network) methods. Then we got two prediction maps using AcrView software through GIS(Geographic Information System) method. The comparative analysis reveals that the slope angle and porosity play important roles in landslide. Prediction map generated by LRA method is more accurate than ANN method in Jeju. From the prediction map, we found that the most dangerous area is distributed around the road and path.
Extraction of Ground Points from LiDAR Data using Quadtree and Region Growing Method
Bae, Dae-Seop ; Kim, Jin-Nam ; Cho, Gi-Sung ;
Journal of Korean Society for Geospatial Information System, volume 19, issue 3, 2011, Pages 41~47
Processing of the raw LiDAR data requires the high-end processor, because data form is a vector. In contrast, if LiDAR data is converted into a regular grid pattern by filltering, that has advantage of being in a low-cost equipment, because of the simple structure and faster processing speed. Especially, by using grid data classification, such as Quadtree, some of trees and cars are removed, so it has advantage of modeling. Therefore, this study presents the algorithm for automatic extraction of ground points using Quadtree and refion growing method from LiDAR data. In addition, Error analysis was performed based on the 1:5000 digital map of sample area to analyze the classification of ground points. In a result, the ground classification accuracy is over 98%. So it has the advantage of extracting the ground points. In addition, non-ground points, such as cars and tree, are effectively removed as using Quadtree and region growing method.
Object-based Building Change Detection from LiDAR Data and Digital Map Using Adaptive Overlay Threshold
Lee, Sang-Yeop ; Lee, Jeong-Ho ; Han, Su-Hee ; Choi, Jae-Wan ; Kim, Yong-Il ;
Journal of Korean Society for Geospatial Information System, volume 19, issue 3, 2011, Pages 49~56
Because urban areas change rapidly, it is necessary to reflect urban changes in a digital map database in a timely manner. To address these issues, LiDAR data was used to detect changes in urban area buildings. The purpose of this study is to detect object-based building change using LiDAR data and existing digital maps, and classify change types. In the study, we classified change type using overlay and shape comparison with building layer of the digital maps and point-based extracted building outline from the LiDAR data. When applying the overlay method, we were able to increase the accuracy and objectivity of the change detection process throughout an adaptive threshold applied to each object. In the experiments, it was demonstrated that classifying and detecting changes in urban areas using the proposed method can provide superior classification accuracy compared with the existing methodology.
A Study on the Selection Method of Subject Parcel to Alter Land Category by Fuzzy GIS Analysis - Focused on Road State of Government Owned and Public Land -
Cho, Tae-In ; Choi, Byoung-Gil ;
Journal of Korean Society for Geospatial Information System, volume 19, issue 3, 2011, Pages 57~66
The purpose of this study is to research into a method of selecting the subject parcel with a change in the category of land given surveying the land alteration state focusing on the present state of road in the government-owned and public land by using the fuzzy membership function and GIS spatial analysis. It selected the old town center of Incheon Jung-gu, and the new downtown & the forest land of Gyeyang-gu as the research subject region, and carried out GIS spatial analysis on a serial cadastral map, urban planning road layer of Korea Land Information System, practical width of road layer of Road Name Address Management System & cadastral data base, and then calculated the suitable index for the subject parcel with a change in the category of land by using the fuzzy membership function with having the critical value as the area ratio of each parcel on a serial cadastral map that was incorporated into road layer or practical width of road layer. It finally selected the parcel, which is different in land category from the real land usage, as the final subject parcel for altering land category, by using the screen of visualizing the suitable index and the aerial ortho photograph. As a result of the final selection, the fuzzy GIS spatial analysis method, which was suggested in this study, is judged to be efficient in the selection period and the methodology compared to the existing manual method. It could be confirmed to be more suitable method for downtown than forest land and for the new downtown than the old town center.
Study on the Method to Create a Pedestrian Network and Path using Navigation Data for Vehicles
Ga, Chill-O ; Lee, Won-Hee ; Yu, Ki-Yun ;
Journal of Korean Society for Geospatial Information System, volume 19, issue 3, 2011, Pages 67~74
In recent years, with increasing utilization of mobile devices such as smartphones, the need for PNS(Pedestrian Navigation Systems) that provide guidance for moving pedestrians is increasing. For the navigation services, road network is the most important component when it comes to creating route and guidance information. In particular, pedestrian network requires modeling methods for more detailed and vast space compared to road network. Therefore, more efficient method is needed to establish pedestrian network that was constructed by existing field survey and manual editing process. This research proposed a pedestrian network creation method appropriate for pedestrians, based on CNS(Car Navigation Systems) data that already has been broadly constructed. Pedestrian network was classified into pedestrian link(sidewalk, side street, walking facility) and openspace link depending on characteristics of walking space, and constructed by applying different methodologies in order to create path that similar to the movements of actual pedestrians. The proposed algorithm is expected to become an alternative for reducing the time and cost of pedestrian network creation.
Analysis on the Initialization Time of Each Mode using OmniSTAR HP
Lee, In-Su ; Park, Byung-Woon ; Song, June-Sol ;
Journal of Korean Society for Geospatial Information System, volume 19, issue 3, 2011, Pages 75~82
In this study, author analyzed the overview and the convergence time of Fixed solutions (<15cm) of OmniSTAR, one of SBAS(Satellite Based Augmentation System) as WADGPS (Wide Area Differential GPS), which can compensate the drawbacks of the existed GNSS (Global Navigation Satellite System) that require the expensive receiver and is impossible to position in case of the radio interference in urban sometimes. As a result, the test shows that the less than 15cm 3D standard deviation converges in 39 minutes at Dynamic mode and 28 minutes at Static mode. It is expected that we can apply OmniSTAR to a variety of fields such as LBS(Location Based Service), mobile positioning, and the geo-spatial information industry that does not necessarily guarantee the high position accuracy.
A Development of Trend Analysis Models and a Process Integrating with GIS for Industrial Water Consumption Using Realtime Sensing Data
Kim, Seong-Hoon ;
Journal of Korean Society for Geospatial Information System, volume 19, issue 3, 2011, Pages 83~90
The purpose of this study is to develop a series of trend analysis models for industrial water consumption and to propose a blueprint for the integration of the developed models with GIS. For the consumption data acquisition, a real-time sensing technique was adopted. Data were transformed from the field equipments to the management server in every 5 minutes. The data acquired were substituted to a polynomial formula selected. As a result, a series of models were developed for the consumption of each day. A series of validation processes were applied to the developed models and the models were finalized. Then the finalized models were transformed to the average models representing a day's average consumption or an average daily consumption of each month. Demand pattern analyses were fulfilled through the visualization of the finally derived models. It has founded out that the demand patterns show great consistency and, therefore, it is concluded that high probability of demand forecasting for a day or for a season is available. Also proposed is the integration with GIS as an IT tool by which the developed forecasting models are utilized.
Efficient Methods for Road Sign Database Construction
Kim, Eui-Myoung ; Cho, Du-Young ; Chong, Kyu-Soo ; Kim, Seong-Hoon ;
Journal of Korean Society for Geospatial Information System, volume 19, issue 3, 2011, Pages 91~98
Road signs are part of the traffic facilities intended to guide drivers to their destinations in a safe and comfortable manner. Due to the creation of new routes, changes to the old routes, and the deterioration of road signs, road signs do require efforts to do ongoing field investigations and put the results in a database. The purpose of this study was to propose methodologies to do field investigations and build a database for road signs efficiently. For that purpose, a mobile mapping system was designed for field investigations. The designed mobile mapping system was comprised of three cameras to produce image information about road signs, GPS/IMU/DMI to obtain information about the position and attitude of a vehicle, and a laser scanner to generate information about the locations of road signs and routes. Also proposed in the study was a procedure to automatically detect the areas of road signs in the road signs images and recognize their characters.
Research on the Design of Korea Land Spatialization Program's Test-bed - Focused on Surveying Equipments -
Song, Ki-Sung ; Park, Jae-Min ; Woo, Hee-Sook ; Kim, Byung-Guk ;
Journal of Korean Society for Geospatial Information System, volume 19, issue 3, 2011, Pages 99~105
The Korean Government is promoting Korean Land Spatialization Program(KLSP) to commercialize and practice of the technology from 2006 to 2012. It is preparing for field test to make research achievements verified in Sejong City by selecting a test-bed area. It creates the conditions to be satisfied standards that can be recognized at internal and external. This paper proposes to design a test bed considering site conditions and various requirements for performance verification of Surveying Equipments in KLSP.
Changes of Drainage Paths Length and Characteristic Velocities in Accordance with Spatial Resolutions
Choi, Yong-Joon ; Kim, Joo-Cheol ;
Journal of Korean Society for Geospatial Information System, volume 19, issue 3, 2011, Pages 107~114
In this study, when interpreting leakage using the concept of geographical dispersion based on grid, to choose an appropriate spatial resolution, the statistical characteristics of drainage path length and the pattern of change of hydrodynamic parameters have been observed. Drainage path length has been calculated using an 8-direction algorithm from digital elevation model, from which the hydrodynamic parameters of the watershed were estimated. The scales of topographical map for this analysis are 1:5,000 and 1:25,000, appling grid sizes 5, 10, 15, 20 m and 20, 30, 50, 100, 150, 200 m, respectively. As results of this analysis, depending on the scale of stream networks, the statistical characteristics of drainage path length by spatial resolution and hydrodynamic parameters of the watershed have been changed. Based on the above results, when interpreting leakage using the concept of the geographical dispersion based on grid, in the case of 1:5,000 scale topographical map, a spatial resolution of 5 m will be better showing geographical and hydrodynamic characteristics to apply to the well developed stream network in basins, spatial resolution of 5~20 m to the less developed stream network in basins. And in the case of 1:25,000 scale topographical map, spatial resolution below 50 m is more desirable to show above two characteristics to apply to both cases.
Geometric Calibration and Accuracy Evaluation of Smartphone Camera
Kim, Jin-Soo ; Jin, Cheong-Gil ; Lee, Seong-Kyu ; Lee, Sun-Gu ; Choi, Chul-Uong ;
Journal of Korean Society for Geospatial Information System, volume 19, issue 3, 2011, Pages 115~125
The smartphones which have been recently are embedded with high resolution quality camera, assisted GPS, accelerometer, gyroscope and various sensors including magnetometer sensor that could be directly used for measurement. This study aims to suggest the possible application of smartphone camera providing high resolution images in terms of photogrammetry by calibrating it and assessing its accuracy. First of all, prior to the accuracy assessment of smartphone camera, camera calibration was conducted to correct lens distortion of each camera and the accuracy of image coordinates and object coordinates calculated by bundle adjustment during this procedure was analyzed. Also regarding three-dimensional positioning, result analysis depending on considering lens distortion coefficients was conducted, and finally relative accuracy of smartphone camera on metric camera was assessed. The result showed that in terms of distortion correction of smartphone camera, also higher order symmetric radial lens distortion coefficients should be considered, and three dimensional position determined by smartphone images was a little difference from that by metric camera. Therefore it is expected that smartphone images have huge possibility to be used for photogrammetry.
A Case Study to Estimate the Unit Standard Infrastructure Cost in Levying the Korean Development Impact Fees
Choei, Nae-Young ;
Journal of Korean Society for Geospatial Information System, volume 19, issue 3, 2011, Pages 127~136
The typical unit infrastructure cost estimation techniques adopted so far in implementing the Korean Impact Fee Zoning have rather been centered around the unilateral simple cost models. The techniques, as such, have frequently been criticized for their lack of flexibility in properly reflecting the regional differences as well as the peculiarities of individual development projects. The Ministry of Land, Transport, and Maritime Affairs (MLTM), in this regard, has recently introduced an enhanced alternative technique. Using the NGIS data, the study probes the viability of the MLTM's new technique by testing the entire estimation process based on the case area in Ansung City. Reflecting the City's characteristics, the study assumes a composite land use plan that accommodates the industrial area in addition to typical residential areas. As an extensive empirical case study, the research has found from the new technique considerable technical merits to overcome the existing shortcomings and summarized its significant policy implications.