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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 28, Issue 6 - Dec 2010
Volume 28, Issue 5 - Oct 2010
Volume 28, Issue 4 - Aug 2010
Volume 28, Issue 3 - Jun 2010
Volume 28, Issue 2 - Apr 2010
Volume 28, Issue 1 - Feb 2010
Selecting the target year
Analysis of Short-Term and Long-Term Characteristics of GPS Satellite Clock Offsets
Son, Eun-Seong ; Park, Kwan-Dong ; Kim, Kyeong-Hui ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 28, issue 6, 2010, Pages 563~571
The GPS satellite has three or four atomic clocks that consist of cesiums and rubidiums and the NANU messages can be used to identify the kind of the onboard atomic clock because they classify the clock type on a daily basis. In this study, for long-term analysis of the GPS satellite clock behavior, we extracted satellite clock errors for every PRN from years 2001 through 2009 using the SP3 files that are provided by the IGS. As a result, the cesium clock offsets usually have a linear trend of drifting. On the other hand, rubidium offsets show curvilinear variations in general, even though they cannot be represented as anyone specific polynomial function. For short-term analysis, we extracted satellite clock errors for each PRN for a week-long period using the CLK files that are also provided by the IGS and curve-fitted them with first-order and second-order polynomial functions. In cases of cesium clock errors, they were well-represented by first-order polynomial functions and rubidium clock errors were similar with second-order polynomials. However, some of rubidium clock errors could not be represented as any polynomial fitting function. To analyze the characteristic of GPS satellite by each block and atomic clock, we applied Modified Allan Deviation criterion to the dataset from years 2007 and 2010. We found that the Modified Allan Deviation characteristics changed significantly according the block and atomic clock type.
Accuracy Analysis of GLONASS Orbit Determination Strategies for GLONASS Positioning
Lee, Ho-Seok ; Park, Kwan-Dong ; Kim, Hye-In ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 28, issue 6, 2010, Pages 573~578
Precise determination of satellite positions is necessary to improve positioning accuracy in GNSS. In this study, GLONASS orbits were predicted from broadcast ephemeris using the 4th-order Runge-Kutta numerical integration method and their accuracy dependence on the integration step and the integration time was analyzed. The 3D RMS (Root Mean Square) differences between the results from I-second integration step and 300-second integration step was about 3 cm, but the processing time was one hundred times less for the I-second integration time case. For trials of different integration times, the 3D RMS errors were 8.3 m, 187.3 m, and 661.5 m for 30-, 150-, and 300-minutes of integration time, respectively. Though this integration-time analysis, we concluded that the accuracy gets higher with a shorter integration time. Thus we suggest forward and backward integration methods to improve GLONASS positioning accuracy, and with this method we can achieve a 5-meter level of 3-D orbit accuracy.
The Application of Geospatial Information Acquisition Technique and Civil-BIM for Site Selection
Moon, Su-Jung ; Pyeon, Mu-Wook ; Park, Hong-Gi ; Ji, Jang-Hun ; Jo, Jun-Ho ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 28, issue 6, 2010, Pages 579~586
Due to the recent development of measuring technology and 3D programs, it has become possible to obtain various spatial data. This study utilizes the 2-dimensional data and 3-dimensional data extraction technology based on the existing empirical and statistical DB. The data obtained from geospatial data technology are integrated with civil engineering BIM to conduct the modeling of the topography of the target region and select the optimum location condition by using the cut and fill balance of the volume of earth. The target area is the land around Tamjin River, Jangheong-gun, Jeolla-do. The 3-dimensional topology linked with 3-dimensional mapping technology by using the orth-image and aerial LiDAR that uses aerial photo of the target area is visualized with Civil3D of AutoDesk. By using Civil3D program, the Thanks to the recent development of measuring technology and 3D programs, target area is analyzed through visualization and related data can be obtained for analysis. The method of using civil engineering BIM enables to obtain various and accurate information about the target area which is helpful for addressing the issues risen from the existing methodology. In this regard, it aims at searching for the alternatives and provides suggestions to utilize the information.
Optimal Network Design for Enhancing the Precision of National Geodetic Network
Cho, Jae-Myoung ; Yun, Hong-Sik ; Wie, Gwang-Jae ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 28, issue 6, 2010, Pages 587~594
This paper describe the optimal design of geodetic network by analytical technique based on the quality criteria of network. We described an example of geodetic network design taking into account the precision, reliability and robustness that are the main criteria of network design. The main goal of this paper is to evaluate the criteria to design the geodetic network coinciding with the criteria of high precision(error ellipse, 2DRMS, CEP), reliability(internal and external reliability) and robustness(maximum shear strain, principal strain, dilatation). The network design parameters computed in this study show that precision and reliability has not much improved by about 2% and 3%, respectively, than the observed network, while robustness has much improved by about 3, 100%. It also shown that maximum errors of precision, reliability and robustness were reduced by 5%, 7% and 16,957%, respectively.
The Suitability Analysis of National Environmental Zoning Map for Selection of Location Possibility about Specific Development Projects
Um, Dae-Yong ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 28, issue 6, 2010, Pages 595~604
In this study, I estimated the development possibility region reflecting of characteristics on region and development projects according to various development projects in order to evaluate the usability of National Environmental Zoning Map(NEZMap). I produced the development possibility maps by rating, and evaluated whether coincidence or not by comparison with NEZMap. As a result, I was able to identity that occurs difference between the development possibility map and NEZMap. I was able to verify that NEZMap which is produced by a uniform standard the entire country did not reflect the the regional & project characteristics. In the future, In order to improve the practical usabilty of NEZMap, the system is thought to be complementary that can further analyze characteristics of region & specific development projects in the NEZMap service system.
A Study on Geometric Correction Method for RADARSAT-1 SAR Satellite Images Acquired by Same Satellite Orbit
Song, Yeong-Sun ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 28, issue 6, 2010, Pages 605~612
Numberous satellites have monitored the Earth in order to detect changes in a large area. These satellites provide orbit information such as ephemeris data, RPC coefficients and etc. besides image data. If we can use such orbit data afforded by satellite, we can reduce the number of control point for geo-referencing. This paper shows the efficient geometric correction method of strip-satellite RADARSAT-l SAR images acquired by same orbit using ephemeris data, single control point and virtual control points. For accuracy analysis of proposed method, this paper compared the image geometrically corrected by the proposed method to the image corrected by ERDAS Imagine.
Improving Field Investigation Process of Digital Mapping with Location-based Image Data
Hwang, Jin-Sang ; Yoon, Hong-Sic ; Jung, Tae-Jun ; Park, Jeong-Ki ; Kim, Chang-Woo ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 28, issue 6, 2010, Pages 613~620
This study focused on the improvement of field investigation process of digital mapping by location-based image data and structured digital map. We analyzed previous methods to find the parts to be improved and suggested new methods. Main concepts of new methods are conducting investigation work indoor and linked the work with map editing for carrying out both work simultaneously by using location-based image data and structured digital map. Pilot project were carried out to compare suggested new methods with previous methods and the applicability were analyzed.
Coregistration of QuickBird Imagery and Digital Map Using a Modified ICP Algorithm
Han, Dong-Yeob ; Eo, Yang-Dam ; Kim, Yong-Hyun ; Lee, Kwang-Jae ; Kim, Youn-Soo ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 28, issue 6, 2010, Pages 621~626
For geometric correction of high-resolution images, the authors matched corresponding objects between a large-scale digital map and a QuickBird image to obtain the coefficients of the first order polynomial. Proximity corrections were performed, using the Boolean operation, to perform automated matching accurately. The modified iterative closest point (ICP) algorithm was used between the point data of the surface linear objects and the point data of the edge objects of the image to determine accurate transformation coefficients. As a result of the automated geometric correction for the study site, an accuracy of 1.207 root mean square error (RMSE) per pixel was obtained.
Development and Evaluation of Image Segmentation Technique for Object-based Analysis of High Resolution Satellite Image
Byun, Young-Gi ; Kim, Yong-Il ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 28, issue 6, 2010, Pages 627~636
Image segmentation technique is becoming increasingly important in the field of remote sensing image analysis in areas such as object oriented image classification to extract object regions of interest within images. This paper presents a new method for image segmentation to consider spectral and spatial information of high resolution satellite image. Firstly, the initial seeds were automatically selected using local variation of multi-spectral edge information. After automatic selection of significant seeds, a segmentation was achieved by applying MSRG which determines the priority of region growing using information drawn from similarity between the extracted each seed and its neighboring points. In order to evaluate the performance of the proposed method, the results obtained using the proposed method were compared with the results obtained using conventional region growing and watershed method. The quantitative comparison was done using the unsupervised objective evaluation method and the object-based classification result. Experimental results demonstrated that the proposed method has good potential for application in the object-based analysis of high resolution satellite images.
Development of a Portable Multi-sensor System for Geo-referenced Images and its Accuracy Evaluation
Lee, Ji-Hun ; Choi, Kyoung-Ah ; Lee, Im-Pyeong ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 28, issue 6, 2010, Pages 637~643
In this study, we developed a Portable Multi-sensor System, which consists of a video camera, a GPS/MEMS IMU and a UMPC to acquire video images and position/attitude data. We performed image georeferencing based on the bundle adjustment without ground control points using the acquired data and then evaluated the effectiveness of our system through the accuracy verification. The experimental results showed that the RMSE of relative coordinates on the ground point coordinates obtained from our system was several centimeters. Our system can be efficiently utilized to obtain the 3D model of object and their relative coordinates. In future, we plan to improve the accuracy of absolute coordinates through the rigorous calibration of the system and camera.
Characteristic Analysis of Crustal Movement around Korean Peninsula By IGS Data
Park, Joon-Kyu ; Kang, Joon-Mook ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 28, issue 6, 2010, Pages 645~653
In this study, IGS(International GNSS Service) stations were processed by the method of PPP(Precise Point Positioning), and velocities of crustal movements about the region of the Korean Peninsula were calculated precisely. The characteristics of crustal movements around Korean Peninsula were understood by velocity calculation of crustal movements. We confirmed from the result which calculated by crustal movement velocity shows the movement Eurasia and North America plate move to south-east, and Philippine plate moves to north-west. This result is respected to be utilized as a basic data about analysis of earthquake and earth physics.
Applicability Analysis of UAV for Storm and Flood Monitoring
Kim, Min-Gyu ; Jung, Gap-Yong ; Kim, Jong-Bae ; Yun, Hee-Cheon ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 28, issue 6, 2010, Pages 655~662
Recently, disasters are increasing rapidly due to global warming and abnormal weather conditions, and the scale of damage is also getting wider. In this study, the application of UAV is analyzed based on previous study about disaster and analysis of regulations for disaster. Also, this study is proposed application model to prepare, reponse and restoration from natural disaster to make use of the UAV. This UAV is quick and economic for existing technology, and available to various disaster monitoring. UAV application for disaster monitoring is able to support effective management of disaster by real time aerial monitoring for reponse from natural disaster and damage assessment.
The Accuracy of Stereo Digital Camera Photogrammetry
Kim, Gi-Hong ; Youn, Jun-Hee ; Park, Ha-Jin ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 28, issue 6, 2010, Pages 663~668
In this study a stereo digital camera system was developed. Using this system, we can collect informations such as coordinates, lengths of all objects shown in the photo image just by taking digital photograph in field. This system has the advantage of obtaining stereo images with settled exterior orientation parameters, while the accuracy slightly worsen because in a close range photogrammetry with stereo digital camera system, the base line distance is restricted within about 1m. We took images with various exposure distances and angles to objects for experimental error assessment, and analyzed the affection of image coordinates errors.
3D Stereo Display of Spatial Data from Various Sensors
Park, So-Young ; Yun, Seong-Goo ; Lee, Young-Wook ; Lee, Dong-Cheon ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 28, issue 6, 2010, Pages 669~676
Visualization requires for effective analysis of the spatial data collected by various sensors. The best way to convey 3D digital spatial information which is modeling of the real world to the users, realistic 3D visualization and display technology. Since most of the display is based on 2D or 2.5D projection to the plane, there is limitation in representing real world in 3D space. In this paper, data from airborne LiDAR for topographic mapping, Flashi-LiDAR as emerging sensor with great potential to 3D data acquisition, and multibeam echo-sounder for underwater measurement, were stereoscopically visualized. 3D monitors are getting popular and could be information media and platform in geoinformatics. Therefore, study on creating 3D stereoscopic contents of spatial information is essential for new technology of stereo viewing systems.