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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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The Korean Society for Geospatial Information System
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Volume & Issues
Volume 20, Issue 4 - Dec 2012
Volume 20, Issue 3 - Sep 2012
Volume 20, Issue 2 - Jun 2012
Volume 20, Issue 1 - Mar 2012
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Assessment of PM-10 Monitoring Stations in Daegu using GIS Interpolation
Kim, Hyo-Jeong ; Jo, Wan-Kuen ;
Journal of Korean Society for Geospatial Information System, volume 20, issue 2, 2012, Pages 3~13
DOI : 10.7319/kogsis.2012.20.2.003
This study evaluated the feasibility of the location for PM-10 Monitoring Stations utilizing through GIS analysis. In addition, optimal sites were investigated to properly manage PM-10 which are closely related with public health. There are 11 PM-10 monitoring stations in Daegu area and the PM-10 data monitored at these stations are utilized to understand the overall status of PM-10 pollution. However, there are contrastive issues on the locations of current monitoring stations. Thus, this study prepared the map of PM-10 concentrations in Daegu area using IDW and Kriging techniques. Furthermore, average PM-10 concentrations were calculated using zonal statistical methods according to legal divisions and then, the current monitoring stations were evaluated whether their location is appropriate or not for PM-10 pollution distribution. It was found that, on the basis of yearly, seasonal and daily concentration analysis, the location of current PM-10 monitoring stations were not appropriate, particularly as they could not represent regional PM-10 pollution characteristics. In order to supplement this deficiency, seven sites(Namsandong, Namildong, Dongildong, Buksungro 1, Jongro 1, Hyangchondong and Haejeondong) commonly selected from each analytical step are suggested as additional PM-10 monitoring sites. It is further suggested that this kind of scientific evaluation for the location of PM-10 monitoring stations are needed in order to properly manage public heath in other cities as well as Daegu area.
The Study on Assessment of Roughness Coefficient for Designing Wind Farm in Jeju Island
Ko, Jung-Woo ; Quan, He Chun ; Lee, Byung-Gul ;
Journal of Korean Society for Geospatial Information System, volume 20, issue 2, 2012, Pages 15~22
DOI : 10.7319/kogsis.2012.20.2.015
The variation in the wind speed with height above ground is called the wind shear profile. In the field of wind resource assessment, analysts typically use one of two mathematical relations to characterize the measured wind shear profile: the logarithmic profile (log law) and the power law profile (power law). The logarithmic law uses the surface roughness as a parameter, and the power law uses the power law exponent as a parameter. The shape of the wind shear profile typically depends on several factors, most notably the roughness of the surrounding terrain and the stability of the atmosphere. Since the atmospheric stability changes with season, time of day, and meteorological conditions, the surface roughness and the power law exponent also tends to change in time. For this study, Using the observed data from Met-mast, located in Pyeongdae, Handong in Jeju. we used the matlab and windograper to calculate roughness length and the law exponents. These calculations are similar to reference the data, but they have different ranges. In the ocean case, each reference data and calculated data was the same, but the crop area is higher than the earlier studies. In addition, the agricultural village is lower than the earlier studies.
An Optimal Model for Indoor Pedestrian Evacuation considering the Entire Distribution of Building Pedestrians
Kwak, Su-Yeong ; Nam, Hyun-Woo ; Jun, Chul-Min ;
Journal of Korean Society for Geospatial Information System, volume 20, issue 2, 2012, Pages 23~29
DOI : 10.7319/kogsis.2012.20.2.023
Existing pedestrian and evacuation models generally seek to find locally optimal solutions for the shortest or the least time paths to exits from individual locations considering pedestrian`s characteristics (eg. speed, direction, sex, age, weight and size). These models are not designed to produce globally optimal solutions that reduce the total evacuation time of the entire pedestrians in a building when all of them evacuate at the same time. In this study, we suggest a globally optimal model for indoor pedestrian evacuation to minimize the total evacuation time of occupants in a building considering different distributions of them. We used the genetic algorithm, one of meta-heuristic techniques because minimizing the total evacuation time can not be easily solved by polynomial expressions. We found near-optimal evacuation path and time by expressing varying pedestrians distributions using chromosomes and repeatedly filtering solutions. In order to express and experiment our suggested algorithm, we used CA(cellular automata)-based simulator and applied to different indoor distributions and presented the results.
A Study of Effective Method to Update the Database for Road Traffic Facilities Using Digital Image Processing and Pattern Recognition
Choi, Joon-Seog ; Kang, Joon-Mook ;
Journal of Korean Society for Geospatial Information System, volume 20, issue 2, 2012, Pages 31~37
DOI : 10.7319/kogsis.2012.20.2.031
Because of road construction and expansion, Update of the road traffic facilities DB is steadily increased each year, and, Increasing drivers and cars, safety signs for traffic safety are required management and additional installation continuously. To update Safety Sign database promptly, we have developed auto recognition function of safety sign, and analyzed coordinates accuracy. The purpose of this study was to propose methods to update about road traffic facilities efficiently. For this purpose, omni-directional camera was calibrated for acquisition of 3-dimensional coordinates, integrated GPS/IMU/DMI system and applied image processing. In this experiment, we proposed a effective method to update database of road traffic facilities for digital map.
A Study on Strategy for Activation of Mobile Spatial Information Industry
Kim, Tae-Hoon ; Hwang, Jung-Rae ; Lee, Sang-Hoon ; Na, Jun-Yeop ;
Journal of Korean Society for Geospatial Information System, volume 20, issue 2, 2012, Pages 39~46
DOI : 10.7319/kogsis.2012.20.2.039
The application area of spatial information such as urban planing, facility management, traffic service are expanded to new service areas such as environmental pollution, securing resources, u-City. In particular, the increased importance of spatial information application in mobile environment based on smart phone, a mobile spatial data infrastructure and related strategy suggestions to provide mobile spatial information service is required. In this paper, we derived strategy suggestions to foster the next generation strategic industry and proposed the role of public sector, the development of mobile spatial information services, the construction of mobile spatial information infrastructure and the stepwise strategies.
Selective Histogram Matching of Multi-temporal High Resolution Satellite Images Considering Shadow Effects in Urban Area
Yeom, Jun-Ho ; Kim, Yong-Il ;
Journal of Korean Society for Geospatial Information System, volume 20, issue 2, 2012, Pages 47~54
DOI : 10.7319/kogsis.2012.20.2.047
Additional high resolution satellite images, other period or site, are essential for efficient city modeling and analysis. However, the same ground objects have a radiometric inconsistency in different satellite images and it debase the quality of image processing and analysis. Moreover, in an urban area, buildings, trees, bridges, and other artificial objects cause shadow effects, which lower the performance of relative radiometric normalization. Therefore, in this study, we exclude shadow areas and suggest the selective histogram matching methods for image based application without supplementary digital elevation model or geometric informations of sun and sensor. We extract the shadow objects first using adjacency informations with the building edge buffer and spatial and spectral attributes derived from the image segmentation. And, Outlier objects like a asphalt roads are removed. Finally, selective histogram matching is performed from the shadow masked multi-temporal Quickbird-2 images.
LOS Analysis Simulation considering Canopy Cover
Kong, Seong-Pil ; Song, Hyun-Seung ; Eo, Yang-Dam ; Kim, Yong-Min ; Kim, Chang-Jae ;
Journal of Korean Society for Geospatial Information System, volume 20, issue 2, 2012, Pages 55~61
DOI : 10.7319/kogsis.2012.20.2.055
The primary factors of the LOS(Line-of-Sight) analysis process are terrain height, camera capacity, and canopy cover. The canopy cover rate differs depending on the changing season, and its value is influenced by the tree density, tree height, and etc. This study generated the canopy cover value based on relationship between NDVI(Normalized Difference Vegetation Index) and DMT(Density Measure % of Tree/Canopy Cover), which is a digital map attribute, and then performed the LOS analysis on six station of test sites. As results, It was found that NDVI and DMT are correlated with each other through the experiments. Based on this finding, new DMT map can be generated using NDVI. Also, There is a difference between the result of visibility analysis using the present DMT and one using a new DMT. Especially, the spatial distributions of the detected visible areas are significantly different between the two visibility analysis results.
The Removal of Spatial Inconsistency between SLI and 2D Map for Conflation
Ga, Chill-O ; Lee, Jeung-Ho ; Yang, Sung-Chul ; Yu, Ki-Yun ;
Journal of Korean Society for Geospatial Information System, volume 20, issue 2, 2012, Pages 63~71
DOI : 10.7319/kogsis.2012.20.2.063
Recently, web portals have been offering georeferenced SLI(Street-Level Imagery) services, such as Google Streetview. The SLI has a distinctive strength over aerial images or vector maps because it gives us the same view as we see the real world on the street. Based on the characteristic, applicability of the SLI can be increased substantially through conflation with other spatial datasets. However, spatial inconsistency between different datasets is the main reason to decrease the quality of conflation when conflating them. Therefore, this research aims to remove the spatial inconsistency to conflate an SLI with a widely used 2D vector map. The removal of the spatial inconsistency is conducted through three sub-processes of (1) road intersection matching between the SLI trace and the road layer of the vector map for detecting CPPs(Control Point Pairs), (2) inaccurate CPPs filtering by analyzing the trend of the CPPs, and (3) local alignment using accurate CPPs. In addition, we propose an evaluation method suitable for conflation result including an SLI, and verify the effect of the removal of the spatial inconsistency.
Forecast of Land use Change for Efficient Development of Urban-Agricultural city
Kim, Se-Kun ; Han, Seung-Hee ;
Journal of Korean Society for Geospatial Information System, volume 20, issue 2, 2012, Pages 73~79
DOI : 10.7319/kogsis.2012.20.2.073
This study attempts to analyze changes in land use patterns in a compound urban and agricultural city Kimje-si, using LANDSAT TM imagery and to forecast future changes accordingly. As a new approach to supervised classification, HSB(Hue, Saturation, Brightness)-transformed images were used to select training zones, and in doing so classification accuracy increased by more than 5 percent. Land use changes were forecasted by using a cellular automaton algorithm developed by applying Markov Chain techniques, and by taking into account classification results and GIS data, such as population of the pertinent region by area, DEMs, road networks, water systems. Upon comparing the results of the forecast of the land use changes, it appears that geographical features had the greatest influence on the changes. Moreover, a forecast of post-2030 land use change patterns demonstrates that 21.67 percent of mountain lands in Kimje-si is likely to be farmland, and 13.11 percent is likely to become city areas. The major changes are likely to occur in small mountain lands located in the heart of the city. Based on the study result, it seems certain that forecasting future land use changes can help plan land use in a compound urban and agricultural city to procure food resources.
Development of a Spatio-Temporal Query Processing System for Mobile Devices
Shin, In-Su ; Yang, Hyeong-Sik ; Kim, Joung-Joon ; Han, Ki-Joon ;
Journal of Korean Society for Geospatial Information System, volume 20, issue 2, 2012, Pages 81~91
DOI : 10.7319/kogsis.2012.20.2.081
As the recent development of the ubiquitous computing environment, u-GIS is being highlighted as the core technology of the ubiquitous computing environment, and thereby, studies on spatio-temporal data are being actively conducted. In this u-GIS environment, it is still difficult for existing mobile devices to efficiently manage the massive spatio-temporal data of u-GIS that are increasing day by day. Therefore, this paper develops a spatio-temporal query processing system for mobile devices in order to solve the problem. The system provides various spatio-temporal operators to insert/delete/update/search spatio-temporal data and supports a query optimization function that uses a spatio-temporal index for the flash memory and a spatio-temporal histogram for guaranteeing query execution speed. Lastly, by applying the spatio-temporal query processing system developed in this paper to the virtual scenario, this paper has proved that the system can be utilized in various application fields necessary to process spatio-temporal data in the mobile environment.
Evaluation of the Quantitative Practical Use of Smart Phone Stereo Cameras
Park, Kyeong-Sik ; Choi, Seok-Keun ;
Journal of Korean Society for Geospatial Information System, volume 20, issue 2, 2012, Pages 93~100
DOI : 10.7319/kogsis.2012.20.2.093
The interest in 3-dimensional information and its practical use are rapidly increasing and thus some goods with stereoscopic views are being released. Mobile phones, unlike other units, are being closely utilized in everyday life and their applications are undoubtedly limitless. In this study, taking photographs with the stereo-camera of mobile phones has been accomplished and also the possibility of getting the quantitative information has been examined. In addition, this study aims to evaluate the quantitative practical use of mobile phones, evaluating the accuracy of the obtained quantitative information. Thus, interior orientation parameters were decided through the calibration of the lens of two cameras equipped with mobile phones. Using the determined interior orientation parameters, the 3-dimensional coordinates on the targets of the test field were calculated and then compared with precisely observed coordinates. Moreover, the performance of the orientation on the arbitrary building resulted in the standard deviation of $X
Analysis of Foot-and-mouth Disease Diffusion Velocity using Network Tool
Choi, Seok-Keun ; Song, Hae-Hwa ; Park, Kyeong-Sik ;
Journal of Korean Society for Geospatial Information System, volume 20, issue 2, 2012, Pages 101~107
DOI : 10.7319/kogsis.2012.20.2.101
With the foot-and-mouth disease problems emerging as a serious social issue, this study set out to analyze the problems with the current setting of preventive zones against epidemics and find ways to minimize damage through preventive measures. For those purposes, the study analyzed the outbreaks of the foot-and-mouth disease and assumed that the disease would be transmitted via vehicles along the roads based on the network map of national roads and boundaries among administrative districts to conduct network analysis. The analysis results were then used to estimate spread time, whose results were then categorized according to lineal road distance and actual road distance. Then lineal moving speed and actual moving speed on the road were obtained according to the national roads and administrative districts to analyze the problems with the current method of setting preventive zones against the foot-and-mouth disease. As for spread speed around the areas where the foot-and-mouth disease broke out, the average lineal spread speed was 53.9km/day, and the average spread speed on the road was 71.1km/day, which indicates there are problems with the current method of setting preventive zones against epidemics.
Time-critical Disaster Response by Cooperating with International Charter
Kim, Seong-Sam ; Goo, Sin-Hoi ; Park, Young-Jin ;
Journal of Korean Society for Geospatial Information System, volume 20, issue 2, 2012, Pages 109~117
DOI : 10.7319/kogsis.2012.20.2.109
Recently, large-scale multi-hazards have been occurred in the various areas of the world. A variety of Earth observation sensors such as satellite EO, aerial and terrestrial LiDAR have been utilized for global natural disaster monitoring. Especially, commercial satellites which observe the Earth regularly and repeatedly, and acquire images with cm-level high spatial resolution enable its applications to extend in the fields of disaster management from advanced disaster monitoring to timely recovery. However, due to existing satellite operation systems with some limitations in almost real-time and wide regional disaster response, close international collaborations between satellite operating organizations like NASA, JAXA, KARI etc. have been required for collecting satellite images in time through a satellite platform with multi-sensors or satellite constellation. For responding domestic natural disaster such as heavy snowfall and extreme rainfall in 2011, this paper proposes a disaster management system for timely decision-making; rapid acquisition of satellite imagery, data processing, GIS analysis, and digital mapping through cooperation with NDMI in Korea and International Charter-Space and Major disasters.