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非地形 寫眞測量에서 多重露出地點의 Network에 관한 硏究
이진덕 金烏工科大學校 1991 論文集 Vol.12 No.-
In the design of a multi-station close-range photogrammetric network, a number of important problems, such as multiple exposure-network geometries and complex imaging geometries must be involved. This paper illustrates three dimensional coordinate standard errors of object points resulted from bundle adjustments derived from multi-station convergent photographs, which were taken on the circular exposure-network. In convergent case, the characteristics of standard errors according to the angle of convergence and the number of photos were suggested and also, some ideas for improving accuracy in muti-station photogrammetry were suggested through standard error comparisons between convergent case and normal case.
Echosounder와 GNSS 기반 해저지형측량시스템의 구축
이진덕,최용진,이재빈 한국지리정보학회 2023 한국지리정보학회지 Vol.26 No.1
A system that extracts seabed topographic information by simultaneously and continuously observing the horizontal position and water depth in the sea by combining a single beam echosounder and GNSS was constructed. By applying the developed system to actual measurements of small-scale sea areas, the effectiveness of bathymetry and sea-floor topographic data acquisition using GNSS and echosounder was examined. By using the developed outdoor program DS-NAV and indoor program DS-CAD and applying the tide level data at the time of actual measurement of the target sea area, it was possible to derive bathymetry results based on the datum level i.e. approximate lowest low water level(A.L.L.W). By using the developed outdoor program DS-NAV and indoor program DS-CAD and applying the tide level data at the time of actual measurement of the target sea area, it was possible to derive the results of bathymetric survey based on the datum level. From database built through the actual measurement. it was possible to create 3D model of the sea-floor topography and extract cross-sections. The results of this study are expected to be economically useful for extracting seabed topographical information from small sea areas or in dredging sites for offshore construction. 본 연구에서는 소규모 해역을 대상으로 한 해양수심측량을 위해 단빔 음향측심기와 GNSS를 조합하여 해상에서 수평위치와 수심을 동시에 연속적으로 관측하여 해저지형정보를 추출하는 시스템을 구축하고 실측에 적용함으로써 수심측량 및 해저지형데이터 획득의 효용성을 검토하고자 하였다. 개발한 외업용 프로그램 DS-NAV와 내업용 프로그램 DS-CAD를 이용하고 대상 해역의 실측 당시 조위데이터를 적용함으로써 기준면(약최저저조면)을 기준으로 한 수심측량 성과를 도출할 수 있었으며, 또한 자동 구축된 데이터베이스로부터 해저지형을 3D 모델링하고 단면도 등을 추출할 수 있었다. 본 연구결과는 소규모 해역에서 해저지형정보를 추출하거나 해상 준설시공현장 등에 경제적으로 활용할 수 있을 것으로 기대된다.
InSAR 및 3-Pass DInSAR 처리기법을 적용한 DEM 추출에 대한 실험 연구
이진덕,배상우 한국콘텐츠학회 2007 한국콘텐츠학회논문지 Vol.7 No.3
As SAR data have the strong point that is not influenced by weather or light amount in comparison with optical sensor data, they are highly useful for temporary analysis and can be collected in time of unforeseen circumstances like disaster. This study is to extract DEM from L-band data of JERS-1 SAR imagery using InSAR and DInSAR processing techniques. As a result of analyzing the extracted coherence and interferogram images, it was shown that the DInSAR 3-pass method produces more suitable coherence values than the InSAR method. The accuracies of DEM extracted from the SAR data were evaluated by employing the DEM derived from the digital topographic maps of 1:5000 scale as reference data. And it was ascertained that baselines between antenna locations largely affect the accuracy of extracted DEM. SAR 데이터는 기상이나 일조량의 제약을 받지 않고 능동적으로 자료를 취득할 수 있다는 장점 때문에 지표면의 시계열 분석자료로서 활용성이 높고, 재해와 같은 돌발상황의 경우에 신속하게 자료를 취득할 수 있다. 본 연구에서는 JERS-1 SAR 영상의 L-밴드 데이터로부터 InSAR 방법과 DInSAR 기법을 이용하여 DEM을 추출하고자 하였다. 추출한 coherence, interferogram 영상을 분석한 결과, DInSAR 3-pass 방식을 이용할 경우 InSAR 방식에 비해 비교적 안정된 coherence값을 가지는 것을 확인할 수 있었다. 축척 1:5000 수치지형도에서 추출한 DEM을 기준자료로 하여 SAR 영상으로부터 추출한 DEM의 정확도를 평가하였으며, 안테나 간의 기선장이 DEM의 정확도에 크게 영향을 미치는 것을 확인할 수 있었다.
Utilizing 3D Laser Scanning Technology for Remodeling Work of Building Inside
이진덕,한승희,이재빈 한국콘텐츠학회 2009 International Journal of Contents Vol.5 No.3
Laser scanning technology is a maturing measurement technology which is capable of obtaining 3D measurement data of objects with high-accuracy, high-resolution and in a short time. Laser scanners are used more and more as surveying instruments for various applications. This paper describes the procedure of 3D data acquirement using terrestrial LiDAR and section drawing extraction through a series of processing for remodeling the interior of a department building.. Accurate drawings are needed for improvement construction of building interior. However if the design drawings of that time of construction work were lost or damaged or actual dimensions of drawings differ from those of design drawings, the interior should be resurveyed. In this study, the extraction process of interior plane figures were suggested through using laser scanning and related reverse engineering software
CCD 카메라 기반 산업사진측량 시스템의 기하학적 수행성 평가
이진덕,김익환 금오공과대학교 산업기술개발연구원 2001 産業技術開發硏究 Vol.17 No.-
For the purpose of industrial precise measurement, interior orientation parameters and lens distortion coefficients of a CCD camera should be derived since the camera was originally made as non-metric. Digital images were acquired on multi-station convergent configuration and then the geometric calibration of the CCD camera(Panasonic WV_BP310) was conducted by the self-calibration technique and also the accuracies of 3D measurements were evaluated. In the case of the CCD camera based system, the average residual of automatic image measurements was estimated as about 1/25 pixel spacing respectively in x and y and the accuracies of object space coordinates ranged from 1/20,000 to 1/25,000 which corresponds to about 60% of the case of the still-video camera based system.