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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of The Korean Society of Civil Engineers
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Journal DOI :
Korean Society of Civil Engeneers
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Volume & Issues
Volume 26, Issue 6D - Nov 2006
Volume 26, Issue 6C - Nov 2006
Volume 26, Issue 6B - Nov 2006
Volume 26, Issue 6A - Nov 2006
Volume 26, Issue 5D - Sep 2006
Volume 26, Issue 5C - Sep 2006
Volume 26, Issue 5B - Sep 2006
Volume 26, Issue 5A - Sep 2006
Volume 26, Issue 4D - Jul 2006
Volume 26, Issue 4C - Jul 2006
Volume 26, Issue 4B - Jul 2006
Volume 26, Issue 4A - Jul 2006
Volume 26, Issue 3D - May 2006
Volume 26, Issue 3C - May 2006
Volume 26, Issue 3B - May 2006
Volume 26, Issue 3A - May 2006
Volume 26, Issue 2D - Mar 2006
Volume 26, Issue 2C - Mar 2006
Volume 26, Issue 2B - Mar 2006
Volume 26, Issue 2A - Mar 2006
Volume 26, Issue 1D - Jan 2006
Volume 26, Issue 1C - Jan 2006
Volume 26, Issue 1B - Jan 2006
Volume 26, Issue 1A - Jan 2006
Selecting the target year
An Analysis of the Traffic Noise Measurement Plans of 'Apartment Complexes' - A Case on the North Riverside Expressway in Seoul -
Kang, Jun Mo ; Lee, Sung Kyung ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 1D, 2006, Pages 1~11
This study conducts a theoretical research on road traffic noise. Also, the domestic road noise forecast models were compared each other and analyzed with advanced countries' models to indicate the application possibility and problems. For the establishment of a general formula, we compared the forecasted value with the actual value applied in the formula proposed by the National Environment Institute, and examined the necessary improvement of the domestic road traffic noise forecast model. Also, a regression model was built to examine the relationship between traffic factors and noise. The traffic volume and speed are the main traffic factors used in this formula to affect the noise. From the results, it was found that the speed had a closer relationship with the noise rather than the traffic volume. Therefore, to decrease road noise, it is more important to control traffic speed. The spatial effect of road traffic noise within the apartment complexes was used in the case study to derive location-specific adjustment values. We surveyed the road traffic noise of three apartment complexes, and found that the road traffic noise within each complex was affected at plane level as well as at three-dimensionally. In other words, as the distance from the sound origin grows farther, noise level decreases. Also, it was found that noise increases as heigt goes up, but drops when the height goes beyond a certain level, and that the effect of noise decreases if there are obstacles along the path of the noise direction. Therefore, apartment site design should be done with consideration of the effects of noise in the future.
Developing the Evaluation System of ITS Device's Performance
Baik, Nam Cheol ; Lee, Sang Hyup ; Oh, Seung Hoon ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 1D, 2006, Pages 13~16
Recently, ITS has been deployed nationwide and at the same time, the demand for the better accuracy and higher quality of traffic information has been increased. Yet, there is no standard evaluation methods or evaluation equipments to verify ITS device's performance, being unable to secure reliable traffic data. In this study, the standard evaluation methods for ITS device's performance are studied by reviewing other nations' evaluation methods and the evaluation system is developed.
Developing an ITS Device's Inspection·Calibration System Based on the Study of Similar Cases
Baik, Nam Cheol ; Lee, Sang Hyup ; Oh, Seung Hoon ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 1D, 2006, Pages 17~21
The systematic validation of the ITS devices' performance reliability is very important because it helps their performance reliability to be maintained in a certain level, enabling to assure the reliability of the collected data, processed data and provided information. Although the government's regulation, "Transportation Efficiency Act", which requires ITS devices to be validated, was passed in 2001, no systematic inspection and calibration procedures have been developed so far. Therefore, in this study the systematic and efficient inspection and calibration method or procedure is investigated by reviewing the similar cases and best practices in Korea and overseas and some recommendations are made.
Analysis on Time Dependent Traffic Volume Characteristics on Highways linked to Recreation Areas
Kim, Yun Seob ; Oh, Ju Sam ; Kim, Hyun Seok ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 1D, 2006, Pages 23~30
The variation in the traffic volume on any given roads is the reflection of its user's economic activities and life patterns. And traffic volume flows in every hour usually take different charateristics depending on the location and the function of the roads. This study produced the Monthly Adjustment Factor, Weekly Adjustment Factor and Design hourly Factor, each of which is the index indicating the traffic volume charaterirstics on the highways leading to the recreation areas in the mountainous and seaside tourist sites. Applying these results, it might be possible to calculate the optimal AADT (Annual Average Daily Traffic) and DHV (Design Hour Volume), also be a help to establish a traffic management policy. Finally, it hopes to promote new version of KHCM (Korea Highway Capacity Manual) which includes traffic volume characteristics on recreation areas.
A Study on the Improvement of Applicaton and Performance on Logistics Information System - In the place of Busan·Kyungnam area -
Choi, Yang-Won ; Lee, Sibok ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 1D, 2006, Pages 31~39
The logistics information system has been recently attracting a great deal of attention for its importance in the national economy. It should be noted, however, that the degree of the system utilization differs by the capabilities of the logistics firms such as logistics management skills, robustness of the organization, technical sophistication, and administrative abilities. A survey was conducted in the Busan and Kyungnam area for 174 companies in the logistics and manufacturing industry. The results of this study can be summarized as follows : First, the degree of utilization of the logistics information system varies depending upon business-type details. Secondly, utilization of the logistics information system is equally important for both manufacturing and logistics companies. Thirdly, it was found that the executives of the companies with logistics management skills can play a key role in utilizing the logistics information system. Finally, the degree of utilization has positive relationships with the logistics performance as the companies benefit from the system not just for saving costs, but more importantly for providing higher-quality services for their customers.
The Study on Determination of Benefit Factor as Constructing Traffic Facilities Using ANP
Kim, Man Kyeong ; Jung, Hun Young ; Lee, Sang Yong ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 1D, 2006, Pages 41~47
The construction of traffic facilities has generated a variety of problems in the equality and efficiency when it would be planed and evaluated. One of the reasons for these phenomena isn't the definition of an objective standard about benefit items. Thus, results of evaluation couldn't give a demonstration of confidence. But, the traffic facility construction and its operation costs are securely appeared. Therefor, it will be demonstrated to decide the benefit items in this study. Before deciding the items, user's satisfaction evaluation and economic analysis would be carried. We find out subway user's satisfaction higher than load traffic mode user in satisfaction evaluation, while subway's economic feasibility is lower than load facility, as a result of B/C analysis. In this inconsistent results, we found out that the benefit value is a little lower because of indefinite standard of it's items as comparing Busan Metropolitan City's population with subway's modal split ratio. Accordingly, we enumerate some benefit items in the case of feasibility evaluation as constructing traffic facility. And each of evaluation items' weight is estimated by using ANP. We found out that the weight value of accessibility has the highest one, that of punctuality has second, that of travel time has third, and benefit items according to improvement of user's traffic condition have much more important than those which were considered in the existence economic analysis.
Estimating Development Density Constrained by Traffic Congestion in the Downtown, Seoul
Hwang, Kee Yeon ; Shin, Sang Young ; Kang, Jun Mo ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 1D, 2006, Pages 49~58
The purpose of this study is to develop transportation-sensitive land use densities in a metropolitan context. It analyses traffic impacts according to 20 different development density scenarios in the downtown Seoul, and estimates the density ceiling. The results identify that the transportation-wise sustainable density in the downtown can be extended up to the FAR level of 460% with an option of 2,000 won congestion charge levied on the downtown area. It also finds that the region-wide sustainability measured by congestion level can be improving as the level of congestion charge increases. Without the congestion charge, however, the density ceiling slides down to 430%. It is recommended that, in order to bring in higher density developments in the region, transportation demand management (TDM) measures are indispensible.
The Linear Density Predictive Models on the On-Ramp Junction in the Urban Freeway
Kim, Tae Gon ; Shin, Kwang Sik ; Kim, Seung Gil ; Kim, Jeong Seo ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 1D, 2006, Pages 59~66
This study was to construct the linear density predictive models on the on-ramp junctions in urban freeway. From the analyses of the real-time traffic characteristic data, and the construction and verification of the linear density predictive models, the models showed a considerable explanatory power with the determination coefficients (
) of over 0.7 between the density and speed data. Also, they showed a considerably high correlativeness with the correlation coefficients (r) of over 0.8 between the calculated density data and the expected ones estimated by the models.
A Study on the Temperature Prediction for Asphalt Pavement Using Field Monitoring Data
An, Deok Soon ; Park, Hee Mun ; Eom, Byung Sik ; Kim, Je Won ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 1D, 2006, Pages 67~72
Temperature prediction in asphalt pavements is the one of most important factors for estimating the pavement response and predicting the pavement performance in the mechanistic-empirical pavement design. A study on temperature prediction procedure with variation of time and depth in asphalt pavements was conducted using field monitoring data. After selecting the temperature monitoring sections, the temperature sensors have been installed in different depths and the temperature data have been collected in every one hour. The developed pavement temperature prediction model was calibrated using field monitoring temperature data. The predicted temperatures were compared with measured temperatures at different seasons in selected sections. The results showed that the solar absorptivity and emissivity values in the fall is different from the values in other seasons. The predicted temperatures agree well with the measured temperatures at a wide range of temperatures. The temperature differences between each other fall in the range of
. It is also found that the regional characteristics did not affect the temperature prediction procedure.
Laboratory Performance Evaluation of High Modulus Asphalt Mixes for Long-Life Asphalt Pavements
Kang, Min Gyun ; Lee, Jung Hun ; Lee, Hyun Jong ; Choi, Ji Young ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 1D, 2006, Pages 73~79
A major purpose of this study is to develop high modulus asphalt mixtures for perpetual asphalt pavements which can save maintenance cost by increasing the design and performance periods of the pavements. Various physical and mechanical laboratory tests are performed for the high modulus asphalt binder developed in this study. The test results show that the properties of the high modulus binder are similar to those of the French high modulus binders. In addition to the binder tests, various performance tests are conducted for the high modulus and conventional mixtures. The dynamic modulus test results indicate that the dynamic modulus values of the high modulus mixtures are higher than those of the conventional mixtures by 10~15% at
, 20~25% at
and 100% at
. It is observed from the performance tests that the high modulus mixtures yield better fatigue, rutting and moisture damage performance than the conventional mixtures.
Research on Practical Rubblization in PCC Pavements Equipment Development and Test Construction
Lee, Seung Woo ; Han, Seung Hwan ; Ko, Suck Bum ; Kim, Ji Won ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 1D, 2006, Pages 81~87
The rubblization technique is breaking the aged concrete pavement slab into rubblized concrete aggregate, and use it as an base material at its original position, then builds overlay above the rubblized base. This method has been successively used in USA due to the advantage of good constructibility, cost-effectiveness as well as the capability of preventing of reflection cracks. However, constructibility and economic performance of rubblization on typical Korean concrete pavements needed to be investigate since to typical Korean concrete pavements have thick slab, as well include lean concrete subbase course. Multi-head type breaker suitable for Korean condition was designed and developed. This multi-head type breaker was designed to rubblize old concrete to the suggested optimum rubblized-depth and rubblized-concrete-aggregate size to prevent reflection crack and maintain high bearing capacity. This machine was used for the test of rubblization of old concrete pavement on a non-use old concrete and a in-serviced road. In these two tests, engineering properties of rubblized base and constructability and cost were investigated. In both tests, the old concrete rubblized to targeted size and depth, and high-level bearing capacity was achieved. Also, superior constructability and lower cost compared with traditional reconstruction was examined.
A Study on Behavioral Characteristics of Asphalt Pavements using Wandering Measurement Devices
Kim, Nakseok ; Jeong, Jin-Hoon ; Lee, Jae-Hoon ; Park, Changwoo ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 1D, 2006, Pages 89~94
Premature failures in pavements are frequently reported due to rapid increasement in traffic volume, heavy vehicles, and high temperature in the summer. Based on this concept in mind, Korea Highway Corporation established the Test Road Operation Center to estimate the pavement performance. To evaluate the pavement performance effectively using the field data, wandering is an important topic in pavement analysis. In this study, portable wandering system was developed and analyzed to investigate the pavement responses due to the dynamic truck passes, and analyzed the wandering to dynamic load test. The test results revealed that the advantages of laser devices were noticeable compare to the other measuring ones. To understand the behavioral characteristics of pavements using the wandering measurement devices, dynamic truck tests were conducted in the field. Test results showed that the effects of wandering on asphalt pavement were significant. The data analysis using this wandering effect is considered as an important tool in performance analysis of asphalt concrete pavement.
Development of 4D System based on New Methodology for Visualizing Construction Schedule Data for Civil Engineering Projects
Kang, Leen Seok ; Jee, Sang Bok ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 1D, 2006, Pages 95~103
One of the main functions of the 4D system includes visualizing numerical schedule data in construction. The existing 4D tools have an excellent function for simulating building projects that all activities are progressed according to vertical work zone. However, it is not easy to implement all of it in the civil engineering project because the construction activities of highway and railway projects are progressed on the horizontal work zone and the 4D simulation for those projects should include earthwork objects that depend on the natural ground condition. This study suggests a new methodology for improving those limitations of 4D system for the civil engineering project and develops a new system by the suggested methodology. To verify the developed system, this study attempts to simulate 4D object for horizontal elements such as earthwork, paving work and tunneling work. The morphing and multi-texturing techniques developed in the study can be new approaches to simulate 4D object for the earthwork such as cutting and banking whose activities are progressed on the natural ground condition. The research results can be expected as a draft function for improving the application of 4D system in civil engineering projects.
The Research on Development of Road Cost Index Using Each Representative Item of Expenditure
Chun, Jin Yong ; Woo, Sungkwon ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 1D, 2006, Pages 105~113
Construction cost index is generally used to estimate the new project cost based on past construction data and to adjust the contract cost when the price change of various articles and items of expenditure composing the contract occurs. In Korea, it is mostly used for modulation of construction contract cost due to fluctuation of prices. However the method for making cost index had some problems in calculating cost index of each expenditure item that could not properly reflect the change of construction cost. To supplement these problems, the research of developing construction cost index has been executed. Through the precedent research, these problems were partially resolved but still remain. Therefore this research proposes the method for making cost index that utilizes representative items of labor, material, equipment by analyzing bill of quantity of road construction, through analysis and comparison of precedent studies. By using this method, it is expected to solve the problems which were not reflected in preceeding studies.
The Development of a Web-based Decision Support System for Construction Claim Management
Sung, Nak Won ; Kim, Young Suk ; Lee, Mi Young ; Lee, Jung Sun ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 1D, 2006, Pages 115~123
Recently, construction claims have been increased for protecting the rights of construction participants and effectively adjusting the changes under the contract. Thus, the importance of claim management has been emphasized in the construction industry. In domestic construction industry, some claim issues involved in construction activities are often being developed into disputes and even litigations because of the absence of methods or systems for the dispute resolution, and the lack of judicial precedents which can be provided as the references for resolving a particular dispute. In general, the judicial precedents related to the disputes and litigations occurred among construction participants would be extremely valuable in evaluating and analyzing current claims issues. However, such useful information has not been effectively accumulated and utilized in resolving the similar or sometimes identical types of disputes, thus requiring a large amount of additional costs, time and efforts. The primary objective of this study is to propose a web-based decision support system for construction claim management, which enables contractual participants to easily access and use the information of the judicial precedents related to the current construction claims. The decision support system is composed of 'prevention' and 'settlement' modules for avoiding and systematically resolving the construction claims.
Characteristics of Vibration of Track and Vehicle Body According to Type of Track in Tunnel of High-Speed Railway Lines
Kim, Man Cheol ; Jang, Seung Yup ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 1D, 2006, Pages 125~132
In the present study, in order to elucidate the vibration characteristics of track and train body according to the type of track in tunnel, the vibration accelerations of the track and the KTX train body have been measured in tunnels of Kyong-Bu high-speed railway(HSR) lines, and the frequency analysis of the measured data has been performed. From this, the vibration characteristics of the track components such as rail, sleeper, ballast and slab, the tunnel lining and the vehicle body according to the type of track are investigated and their relation is analyzed. The test results show that the vibration of rail and vehicle body rapidly increases at 80Hz in tunnel, and that is much higher in the tunnel on which the concrete slab track is placed. According to the results of the present study, rail supporting stiffness can variate the vibration characteristics of the total system including the vehicle, and therefore the correlation between the vibration of vehicle should be taken into account to determine the supporting stiffness of the slab track.
The Classification of Railroad Accident Types and Its Standardization
Lim, Kwang-Kyun ; Kim, Sigon ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 1D, 2006, Pages 133~140
This paper suggests to reclassify railroad accident types and to standardize them as the standardized code for the railroad safety management system. The existing railroad accident types in both domestic and foreign cases have been carefully analyzed in the beginning. Based on the case studies, the new railroad accident types are classified into 9 classes which are not overlapped one another and 9 classes have been subdivided into 40 different accident patterns. All these patterns are linked with 9 different accident objects and 6 accident locations. Therefore, this study suggested the combination of 4 distinct code factors: accident class, accident pattern, accident object, and accident location to standardize them. In addition, inter-operation between the proposed codes and the existing accident types is suggested. This code will play a major role in the railroad safety management system composed of accident prevention, accident preparedness, accident response, and accident recovery.
Loss and Sediment Estimation for the Precise Monitoring of Surface Soil
Kang, Young Mi ; Kang, Joon Mook ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 1D, 2006, Pages 141~147
Soil losses are occurred by rainfall has caused productivity decline of a fertile surface soil and inflow sediment on Dam reservoir which are the main reasons of the decrease of storage volume and difficulty of water management. In this study, the amount and location of soil losses which were evaluated using USLE(Universal Soil Loss Equation) were applied on soil, landcover, and topographical conditions on the basis of satellite images and GIS. Furthermore, it was possible to evaluate the amount of riverbed sediments using echo-sounder and sediment rate were analyzed by comparing with soil losses.
A Study on Utilizing 1:1,000 Digital Topographic Data for Urban Landuse Classification
Min, Sookjoo ; Kim, Kyehyun ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 1D, 2006, Pages 149~156
Existing method of landuse classification using aerial photographs or field survey requires relatively higher amount of time and cost due to necessary manual work. Especially in urban area where the pattern of landuse is densely aggregated, a landuse classification using satellite image is more complex. In this background, this study proposes a landuse classification method to utilize 1:1,000 digital topographic data and IKONOS satellite image. To prove the possibility of this method, the method was applied to Seoul metropolitan area. The results shows the total accuracy of approximately 95% and 14 landuse classes extracted. Based on the results from the pilot study, this method is applicable to landuse classification in urban area.
A Study on Method of Framework Data Update and Computing Land Change Ratio using UFID
Kim, Ju Han ; Kim, Byung Guk ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 1D, 2006, Pages 157~167
During the first and second NGIS projects by the Korean government, The first one (1995~2000) was limited on constructing geographic information and the second (2001~2005) was focused on circulation and practical use of geoinformation from the result of the first project. In the latter half of 2nd NGIS project, However, the geographic information from the NGIS projects have not been renewed even though there were significant geographical changes. The accurate renewal of geoinformation is a matter of great importance to the next generation industry (e.g. LBS, Ubiquitous, Telematics). In this respect, it is time to update the geographic information in the latter half of the second NGIS project. Therefore, It is not only important to build an accurate geoinformation but also rapid and correct renewal of the geoinformation. NGII (National Geographic Information Institute) has been studying for improvement of digital map that was constructed by the result of the 1st NGIS project. Through the construction of clean digital map, NGII constructed Framework Data to three kinds of formats (NGI, NDA, NRL). Framework Data was contained to other database, and provided the reference system of location or contents for combining geoinformation. Framework Data is consist of Data Set, Data Model and UFID (Unique Feature Identifier). It will be achieved as national infrastructure data. This paper attempts to explore a method of the update to practical framework data with realtime geoinformation on feature's creation, modification and destruction managed by 'Feature management agency' using UFID's process. Furthermore, it suggests a method which can provide important data in order to plan the Framework update with the land change ratio.
GIS Management on Risk Evaluation of a Road Slope Using Terrestrial LiDAR
Jang, Yong Gu ; Kwak, Young Joo ; Kang, In Joon ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 1D, 2006, Pages 169~175
Recently, slope failures are disastrous when they occur in mountainous area adjoining highways. The accidents associated with slope failures have increased due to rapid urbanization of mountainous area. Therefore, the inspection of slope is conducted to maintain road safety as well as road function. In this study, we apply to the remedy which is comparing existent description to advanced technology using GIS. We utilize a Terrestrial LiDAR, one of the advanced method, to generate precise and complete road slope model from expert point of view. In result, we extract hazardous slope information from external measurements referring to the evaluation criteria of external slope stability. We suggest not only the database but also the method of road risk evaluation based on internet GIS.
A Study on GIS Data Development and Distributed Modeling for Hydrological Simulation of Urban Flood
Kim, Seong-Joon ; Park, Geun-Ae ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 1D, 2006, Pages 177~184
This study is to develop a distributed urban flood runoff model that simulates the road runoff and to test the applicability of the model by applying to Pyeongtaek city of
. To generate the runoff along the runoff, agree burned DEM (Digital Elevation Model) with road networks was suggested and the proper spatial resolution of DEM was identified finer than 15 m. To test the model applicability, 32 points on the road networks were selected and the hydrographs of each point were generated. The test showed reasonable results that increase the road runoff from the high elevation roads to the low elevation roads and the road runoff considering rainwater drainage from the road also showed reasonable results.
Development of Pre-Environmental Investigation GIS Decision Making System Using Spatial Analysis Technique
Kim, Sang Seok ; Jang, Yong Gu ; Kang, In Joon ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 1D, 2006, Pages 185~193
The on-going pre-environmental investigation at present is performed by separate numerical analysis of each provision which makes integrated pre-environmental investigation is difficult. The application of numerical data is insufficient, which results to the deterioration of environmental investigation result's objectivity. A lot of time and money is required for the investigation. In this study, the spacial analysis function of GIS was applied on the 8 pre-environmental investigation factors. Pre-environmental investigation GIS DMS(Decision Making System) was constructed to make integrated investigation possible through the use of investigation results for each factor. Through the use of the developed pre-environmental investigation GIS DMS and the pre-constructed GIS data, the objectivity of environmental investigation is sufficient and time and cost are reduced. Therefore, this system can be used for pre-environmental investigation during route selection in the initial stages of road construction. Through the numerical and visual data obtained from the system developed in this paper, it is easier to gain the approval of the public. Furthermore, environmental problems due to road construction can be investigated with less time and money during the initial stages of road construction.
Analysis of Infiltration Route using Optimal Path Finding Methods and Geospatial Information
Bang, Soo Nam ; Heo, Joon ; Sohn, Hong Gyoo ; Lee, Yong Woong ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 1D, 2006, Pages 195~202
The infiltration route analysis is a military application using geospatial information technology. The result of the analysis would present vulnerable routes for potential enemy infiltration. In order to find the susceptible routes, optimal path search algorithms (Dijkstra's and
) were used to minimize the cost function, summation of detection probability. The cost function was produced by capability of TOD (Thermal Observation Device), results of viewshed analysis using DEM (Digital Elevation Model) and two related geospatial information coverages (obstacle and vegetation) extracted from VITD (Vector product Interim Terrain Data). With respect to 50m by 50m cells, the individual cost was computed and recorded, and then the optimal infiltration routes was found while minimizing summation of the costs on the routes. The proposed algorithm was experimented in Daejeon region in South Korea. The test results show that Dijkstra's and
algorithms do not present significant differences, but A* algorithm shows a better efficiency. This application can be used for both infiltration and surveillance. Using simulation of moving TOD, the most vulnerable routes can be detected for infiltration purpose. On the other hands, it can be inversely used for selection of the best locations of TOD. This is an example of powerful geospatial solution for military application.
Vegetation Height and Age Estimation using Shuttle Radar Topography Mission and National Elevation Datasets
Kim, Jin-Woo ; Heo, Joon ; Sohn, Hong-Gyoo ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 1D, 2006, Pages 203~209
SAR (Synthetic Aperture Radar) technology, which is not influenced by cloud cover because of using electromagnetic wave of long wavelength, has an advantage in mapping the earth. NASA, recognizing these strong points of SAR, launched SRTM (Shuttle Radar Topography Mission), and acquired the topographic information of the earth. SRTM and NED (National Elevation Data) of USGS were used for the research and vegetation height map was produced through differentiating the two data. Correlation between SRTM-NED and planting year was analyzed to see the relationship. Strong correlation was detected and it shows the feasibility of estimating timber age and eventually creating timber age map from SRTM-NED. Additional analyses were conducted to check if the linearity is influenced by regional characteristics and forest uniformity. As results, the correlation between SRTM-NED and timber age is influenced by roughness of the terrain. Overall, this paper shows that timber age estimation using SRTM and NED can be sufficiently practical.
Extraction of Urban Boundary Using Grey Level Co-Occurrence Matrix Method in Pancromatic Satellite Imagery
Kim, Gi Hong ; Choi, Seung Pil ; Yook, Woon Soo ; Sohn, Hong Gyoo ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 1D, 2006, Pages 211~217
Growing urban areas modify patterns of local land use and land cover. Land use changes associated with urban expansion. One way to understand and document land use change and urbanization is to establish benchmark maps compiled from satellite imagery. Old satellite Imagery is useful data to extract urban information. CORONA is a photo satellite reconnaissance program used from 1960 to 1972 and its imagery was declassified and has been available to the public since 1995. Since CORONA images are collected with panoramic cameras, several types of geometric distortions are involved. In this study we proposed mathematical modeling method which use modified collinearity equations. After the geometric modeling, we mosaicked images. We can successfully extract urban boundaries using GLCM method and visual interpretation in CORONA (1972) and SPOT (1995) imagery and detect urban changes in Seoul quantitatively.