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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography
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Volume & Issues
Volume 27, Issue 6 - Dec 2009
Volume 27, Issue 5 - Oct 2009
Volume 27, Issue 4 - Aug 2009
Volume 27, Issue 3 - Jun 2009
Volume 27, Issue 2 - Apr 2009
Volume 27, Issue 1 - Feb 2009
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GPS Satellite Repeat Time Determination and Orbit Prediction Based on Ultra-rapid Orbits
Lee, Chang-Moon ; Park, Kwan-Dong ; Kim, Hye-In ; Park, Jae-Min ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 27, issue 4, 2009, Pages 411~420
To plan a GPS survey, they have to decide if a survey can be conducted at a specific point and time based on the predicted GPS ephemeris. In this study, to predict ephemeris, we used the repeat time of a GPS satellite. The GPS satellite repeat time was determined by analysing correlation among three-dimensional satellite coordinates provided by the 48-hour GPS ephemeris in the ultra-rapid orbits. By using the calculated repeat time and Lagrange interpolation polynomials, we predicted GPS orbits f3r seven days. As a result, the RMS of the maximum errors in the X, Y, and Z coordinates were 39.8 km 39.7 km and 19.6 km, respectively. And the maximum and average three-dimensional positional errors were 119.5 km and 48.9 km, respectively. When the maximum 3-D positioning error of 119.5 km was translated into the view angle error, the azimuth and elevation angle errors were 9.7'and 14.9', respectively.
Accuracy Evaluation of DEM Construction for River Region using ALS & MBES
Kwon, O-Chul ; Kwon, Jay-Hyoun ; Lee, Ji-Sun ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 27, issue 4, 2009, Pages 421~428
In Korea, the change of river flux due to seasons change is so considerable because of the mountainous terrain with the sharp slope and leaned rainfall. This unfavorable natural condition and the difficulties in precise grasping of the river status made the water resource management difficult so that the necessity of the precise river management has been continuously increased. In this study, a precise river-region DEM using the latest equipments of ALS and MBES is constructed. After acquiring DEM from each senor on the river region, a single DEM was generated by combining them. Also, the field inspection was carried out in the overlapped region of ALS and MBES in order to verify the quality of DEM. The verification of DEM was carried out by comparison between TINs obtained from the combined result of ALS and MBES and the surveying result from total station at more than 10 points in the selected two test areas. As a result, NO.1-area's RMSE of 0.322m and 0.113m are obtained for NO. 1 and NO. 2 areas, respectively. The result of this study shows the feasibility of DEM construction for river region using ALS and MBES as seen in the case of NO. 2 area. At the same time, it was appeared that a better method on the data fusion should be developed as seen in the result of NO. 1 area.
Color Assessment for Mosaic Imagery using HSI Model
Woo, Hee-Sook ; Noh, Myoung-Jong ; Park, June-Ku ; Cho, Woo-Sug ; Kim, Byung-Guk ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 27, issue 4, 2009, Pages 429~435
This paper propose color assessment method using HSI model to evaluate quantitative quality of mosaic images by aerial digital frame camera. Firstly, we convert RGB color into HSI model and we extract six pixel information of S and I corresponding to H from adjacency image by using HSI model. Secondly, a method to measure similarity and contrast is proposed and performed for assesment of observation regarding adjacency images. Through these procedure, we could generate four parameters. We could observe that both of the evaluation results by proposed method and the evaluation results by visual were almost similar. This facts support that our method based on several formula can be an objective method to evaluate a quality of mosaic images itself.
Precision GPS Orbit Determination and Analysis of Error Characteristics
Bae, Tae-Suk ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 27, issue 4, 2009, Pages 437~444
A bi-directional, multi-step numerical integrator is developed to determine the GPS (Global Positioning System) orbit based on a dynamic approach, which shows micrometer-level accuracy at GPS altitude. The acceleration due to the planets other than the Moon and the Sun is so small that it is replaced by the empirical forces in the Solar Radiation Pressure (SRP) model. The satellite orbit parameters are estimated with the least-squares adjustment method using both the integrated orbit and the published IGS (International GNSS Service) precise orbit. For this estimation procedure, the integration should be applied to the partial derivatives of the acceleration with respect to the unknown parameters as well as the acceleration itself. The accuracy of the satellite orbit is evaluated by the RMS (Root Mean Squares error) of the residuals calculated from the estimated orbit parameters. The overall RMS of orbit error during March 2009 was 5.2 mm, and there are no specific patterns in the absolute orbit error depending on the satellite types and the directions of coordinate frame. The SRP model used in this study includes only the direct and once-per-revolution terms. Therefore there is errant behavior regarding twice-per-revolution, which needs further investigation.
Decision of Optimal Density of Airbone LiDAR Points for City zone
Kim, Kam-Lae ; Kim, Sang-Bong ; Kim, Nam-Yong ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 27, issue 4, 2009, Pages 445~452
Through the Airbone LiDAR point, the study for three-dimensional modeling of the city zone has been in progress. So, deciding the Density of Airbone LiDAR point for that is very important to get a result of three-dimensional modeling of the city zone and make efficient use of airbone LiDAR. This study made the standard density to decide the optimum density of Airbone LiDAR point in the city zone. Through each standard density point of DSM and the outline of the buildings, It executed the visual evaluation and the accuracy inspection to decide the optimum density point, and presented the optimum density for the airbone LiDAR point in the city zone.
A Study on Generation of Free Stereo Mosaic Image Using Video Sequences
Noh, Myoung-Jong ; Cho, Woo-Sug ; Park, June-Ku ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 27, issue 4, 2009, Pages 453~460
For constructing 3D information using aerial photograph or video sequences, left and right stereo images having different viewing angle should be prepared in overlapping area. In video sequences, left and right stereo images would be generated by mosaicing left and right slice images extracted in consecutive video sequences. Therefore, this paper is focused on generating left and right stereo mosaic images that are able to construct 3D information and video sequences could be made for the best use. In the stereo mosaic generation, motion parameters between video sequences should be firstly determined. In this paper, to determine motion parameters, free mosaic method using geometric relationship, such as relative orientation parameters, between consecutive frame images without GPS/INS geo-data have applied. After determining the motion parameters, the mosaic image have generated by 4 step processes: image registration, image slicing, determining on stitching line, and 3D image mosaicking. As the result of experiment, generated stereo mosaic image and analyzed result of x, y-parallax have showed.
Development of GPS-RTK Algorithm for Improving Geodetic Performance in Short Baseline
Choi, Byung-Kyu ; Lee, Sang-Jeong ; Park, Jong-Uk ; Baek, Jeong-Ho ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 27, issue 4, 2009, Pages 461~467
Relative positioning technique by GPS that can obtain the high positioning accuracy has been used for generation of high precision positioning with elimination or the reduction of the common errors. This paper gives some algorithms for RTK and considers the filter to estimate the positioning information and integer ambiguities at each epoch in the whole algorithms. The extended kalman filter has been employed to estimate the state parameters and the modified LAMBDA to resolve the integer ambiguities. The data processing was performed by GPS single frequency and dual frequency in short baseline. The verification procedure of these positioning compared with results from Bernese 5.0 software. We presented some statistic values on positioning errors and the rates of integer ambiguity resolution.
A Development of lidar data Filtering for Contour Generation
Wie, Gwang-Jae ; Kim, Eun-Young ; Kang, In-Gu ; Kim, Chang-Woo ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 27, issue 4, 2009, Pages 469~476
The new laser scanning technology allows to attain 3D information faster with higher accuracy on surface ground, vegetation and buildings of the earth surface. This acquired information can be used in many areas after modifying them appropriately by users. The contour production for accurate landform is an advanced technology that can reveal the mountain area landscapes hidden by the trees in detail. However, if extremely precise LiDAR data is used in constructing the contour, massive-sized data intricates the contour diagram and could amplify the data size inefficiently. This study illustrates the algorithm producing contour that is filtered in stages for more efficient utilization using the LiDAR contour produced by the detailed landscape data. This filtering stages allow to preserve the original landscape shape and to keep the data size small. Point Filtering determines the produced contour diagram shape and could minimize data size. Thus, in this study we compared experimentally filtered contour with the current digital map(1:5,000).
A Study on Organization of Service Function on the Integrated Management Platform of the u-City
Kang, Joon-Mook ; Baik, Song-Hoon ; Kim, Nam-Gyu ; Park, Joon-Kyu ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 27, issue 4, 2009, Pages 477~484
An Integrated Management Platform, which plays a core role in managing u-City, intelligently control various infra-structure components by accommodating a large number of sensors and devices; and analyzing data received from these sensors and devices through wired/wireless sensor networks. In this paper, the services provided by the integrated management platform for u-City are classified into common application service, operational management service, and platform gateway service, and furthermore detailed functions for each service are defined. These functions, through their roles and information flows, will clarify the requirements of the integrated management platform, and through their addition and modification will be utilized as a reference model for the functional organization of the integrated management platform.
Realization of GIS Service Scenario on the Basis of the Urban Control System
Park, Joon-Kyu ; Baik, Song-Hoon ; Seo, Dong-Seob ; Kang, Joon-Mook ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 27, issue 4, 2009, Pages 485~493
The u-City offers diverse u-services, which are integrated with information and GIS technologies, by utilizing an integrated management platform for controlling the city efficiently, increasing convenience of city lift, and improving the quality of lives. An urban control system is a core element of the u-City to connect organically and expand all kinds of information through various u-interfaces. This study presents the implementation of a GIS service module based on the urban control system for the efficient development of u-services, which contributed to the successful execution of GIS service scenarios that include processes of unexpected events, air pollution monitoring, and emergences. The results of the study can be used as basic data for the design and operation of practical u-City services.
Analysis of Three Dimension Landscape Impact Using Intelligent Spatial Data
Lee, Hyun-Jik ; Yang, Seung-Ryong ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 27, issue 4, 2009, Pages 495~503
A landscape represents a part of the local environmental characteristics consisting of nature, artificial factors, and human living condition, and is now emerging as the very important factor in the development and conservation of national land. However, due to the rapid economic growth and development-based land businesses during the past, environment-friendly and nature-friendly development was not realized so that the development considering the landscape of downtowns and highlands was not achieved as well. Thus, in this study, targeting the area in which development and rehabilitation are being Intelligent Spatial Data, and through the three-dimensional simulation before and after the development and rehabilitation, realistic landscape impact could be analyzed and the consequential problems by the development and rehabilitation were easily figured out.
Experiment of Propagation for Development of the RTLS to the Consturction site
Park, Jae-Sun ; Lim, Sang-Boem ; Pyeon, Mu-Wook ; Hong, Tae-Min ; Lee, Byoung-Kil ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 27, issue 4, 2009, Pages 505~513
Recently, researches on the construction information for construction of high-tech cities are under performed. RTLS(Real-Time location system) for gathering the dynamic location information of construction resources in construction sites, such as workers, materials and equipments, is one of the developments. Especially, construction resources can be managed efficiently with the dynamic location information and the improvement of safety and the reduction of cost are expected. To introduce the RTLS to the construction sites, the installation location of AP(Access Point) must be simulated using the 3-dimensional visibility analysis considering the propagation distance of AP. In this research, 3-dimensional signal simulation software based on the spatial data using surveying terrestrial LiDAR is developed. The simulated results are compared with the signal strength of field experiments for 4 test sites. As a result, the signal strength from the propagation model is most similar to that of field experiment at the front of the main building and the maul playground of Konkuk University. The visibilities in that sites are higher than other sites. among 4 test sites.