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박운용,곽두호,정성모 동아대학교 건설기술연구소 2000 硏究報告 Vol.24 No.2
This study deals with the derivation of coefficient of coordinate transformation suitable for TAEGU, KYUNG-SANG BUKDO to transform WGS-84 ellipsoid into Bessel ellipsoid according to the type of GPS network design and dimension. 2D + 1D and 3D results are shown similar through the dimensional analysis, and the accuracy of latitude, longitude using 3-parameters is less accurate than that of 2D + 1D and 3D, but height was more precise. But, overall accuracy was low. So, it is required that development of geoid model and complete check of reference control points is necessary to extract the coefficient of precise coordinate transformation using the result of GPS satellite surveying in small area.
LIS를 이용한 數値地圖와 數値地積圖의 重疊에 따른 正確度 分析에 관한 연구
박운용,곽두호,정성모,김정동 동아대학교 건설기술연구소 2000 硏究報告 Vol.24 No.1
The cadastral administration is centered around cadastral maps. It increasing that demand of the public for effective administration and higher quality of service through the development of application program of cadastral maps maintenance. Also, there has been much demands for the digital information of cadastral maps in other systems. Land Information System is the answer to meet with the public for effective administration and higher quality of service. In this study, The graphic and attribute data of cadastral maps were integrated on the same DBMS. Also, pointing out difficulties of database implementation and many experiences in the development of application program will be used effectively for further expansion of the automation of cadastral administration.
박운용,곽두호,정성모,김천영 동아대학교 건설기술연구소 2001 硏究報告 Vol.25 No.1
The aim of our research is to find out how digital photogrammetry responds to image compression. Specially, we wish to know if using JPEG image compression leads to loss of accuracy in DTM derived by digital methods. We first review JPEG compression, and since we use the PCI OrthoEngine Airphoto Edition v6.3 digital phtogrammetry software, we briefly review it's principle of principle of operation. We use knowledge of the effect of JPEG compression on the geometric accuracy of images to predict the influence of compression on DTM accuracy. We then compare this to estimates derived from actual measurements. We find that the actual effect om DTM accuracy is greater than predicted, and consistent with geometric error due to compression in the region of 0.33 pixel.
GPS를 이용한 항공삼각측량의 정확도 향상에 관한 연구
박운용,이동락,곽두호 동아대학교 건설기술연구소 1997 硏究報告 Vol.21 No.1
This study deals with the airborne kinematic GPS position for aerotriangulation. It can decrease the cost which in necessary for the setting up and the preservation of the control points through the use of aerial control points, substitutes for ground control points which is required for the block adjustment with the exact determination of the camera exposure station at the instance of photo flight. This papers introduce the theory of GPS code and the additional parameters required to correct the sysnetic errors in the combined block adjustment. Also we intend to upgrade the reliability by the robust estimation method which can detect a few gross errors at a time. However, it is expected that aerotriangulation map production will be effective thanks to the fast improvement of C/A-code receiver and the development of observation method at the coastland which is difficult to set up the control points.
GPS/GLONASS 결합에 의한 차량의 이동궤적의 정확도 분석
박운용,이인수,곽두호,정성모 동아대학교 건설기술연구소 2000 硏究報告 Vol.24 No.2
Satellite visibility, accuracy, and availability were increased by the combined GPS/GLONASS. But, there are some problems such as differences in the time frame, differences in the coordinate datum, and the problem of solving carrier phase ambiguities in the combined carrier frequency solutions due to different GLONASS frequency. Therefore, the author will access the accuracy analysis of positioning using the combined PGS/GLONASS, and intend to study the characteristics of the combined GPS/GLONASS with considered the rate of data acquisition according to satellite visibility, elevation mask angle and kinematic relative position at the combined GPS/GLONASS.
GPS를 이용한 항공삼각측량의 정확도 향상에 관한 연구
박운용,이동락,곽두호 東亞大學校 建設技術硏究所 1997 硏究論文集 Vol.21 No.1
This study deals with the airborne kinematic GPS position for aero triangulation. It can decrease the cost which in necessary for the setting up and the preservation of the control points through the use of aerial control points, substitutes for ground control points which is required for the block adjustment with the exact determination of the camera exposure station at the instance of photo flight. This papers introduce the theory of GPS code and the additional parameters required to correct the sysnetic errors in the combined block adjustment. Also we intend to upgrade the reliability by the robust estimation method which can detect a few gross errors at a time. However, it is expected that aero triangulation map production will be effective thanks to the fast improvement of C/A-code receiver and the development of observation method at the coastland which is difficult to set up the control points.
박운용,정성모,곽두호,이흥규 東亞大學校 大學院 1999 大學院論文集 Vol.24 No.-
Real Time Kinematic GPS will allow a multitude of monitoring, navigation and engineering applications. Applications inclued real time deformation and movement monitoring and real time automated plant control. In a low dynamic environment, with a short baseline length, it is possible to position a roving receiver to an approximate accuracy of less than 5mm within a few seconds of thestart of the ambiguity. One Engineering application is the monitoring of the movement of cable suspension bridges. Such structures are capable of movements of up to a few meters under adverse wind conditions or heavy traffic loads. The use of relative OTF positioing at strategic points upon the bridge would allow close monitoring of the bridge's movements and calculate deformation and long-term deterioration factors for the bridge. Future bridge designs and traffic management schemes could also benefit from the monitoring system.
박운용,차성렬,곽두호,정성모 동아대학교 건설기술연구소 2000 硏究報告 Vol.24 No.2
DTM(Digital Terrain Model) can play a key rule in a great number of the fields of construction Engineering. One of the most important application fields is to determine volume in that the total construction expenses is usually calculated through this. It therefore is necessary to the study on improving the precise of the determination using DTM on account of saving time and cost. On this study, 1:5000 topographic maos issued by NGI in 15 districts involved in Pusan city was digitalized to generate DTM at first. After this step, not only was the determination of the volume as well as readjusted area and height done for the sake of estimating the changable topography caused by cut & fill volume in future but also provided the model to calculate it as results. In addition, comparison among the interpolations, such as Inverse Distance Method and Nearest Neighbor, was respectively done to look over the differences of the volume estimated from each interpolation and also to find the most suitable method. As a result, the former yielded the largest values of area and the volume while the latter gave the smallest ones. Moreover, the values estimated on this study were closely similar to ones obtained by the government of Pusan.