• Title, Summary, Keyword: Photogrammetry

Search Result 2,845, Processing Time 0.044 seconds

Analysis of Topography Using RC Helicopter Surveying System (무선조정 헬리콥터 사진측량시스템을 이용한 지형 분석)

  • Jang, Ho-Sik;Lee, Jung-Chool;Kim, Cha-Kyum;Cha, Sung-Yeoul
    • Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
    • /
    • /
    • pp.157-160
    • /
    • 2007
  • In this study, the method of extracting DEM is presented using RC Helicopter Photogrammetry System. From the result of reference points and checkpoints using Total Station which is conventional type of survey, the errors turned out to $-0.194{\sim}0.224m$ on the X-axis, $-0.088{\sim}0.180m$ on the Y-axis and $-0.286{\sim}0.283m$ on the Z-axis when RC Helicopter Photogrammetry System utilized. Through this RC Helicopter Photogrammetry System, they can provide efficient update of digital map on toparchy area or access is not easy area.

  • PDF

Industrial Photogrammetry Method for Precise Measurement of The Steel Box Girder (교량 무가조립을 위한 산업사진측량 기법)

  • 정성혁;박경식;최석근;이재기
    • Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
    • /
    • /
    • pp.189-195
    • /
    • 2004
  • The purpose of this study was to establish the accuracy of the industral photogrammetry system constructed with INCA2 metric camera and V-STARS system on steel box girder measurement under industrial measurement condition. The objective of the measurement was to determine the distances of plane to plane or plane to libs, precise positions of the bolt holes and angles of the plane to plane on the steel box girder using coded targets, tape targets, edge targets and target adapters. The measurement undertaken has shown that industrial photogrammetry method were a very accurate and more importantly were produced quietly to measure the steel box girder.

  • PDF

Measurement of Aircraft using Industrial Photogrammetry (산업사진측량에 의한 항공기 측정)

  • 유정흠;정성혁;함창학;이재기
    • Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
    • /
    • /
    • pp.223-228
    • /
    • 2004
  • As industries developed, industrial goods have got bigger and more precise. It led producers to feel like having a way to confirm whether the goods are good enough for the needs of consumers or not. Because of that, producers got interested in industrial photogrammetry that can get accurate data quickly without coming cotact with customers directly. Based on the need, this study is examined by photographing an O-2A aircraft which is a large and precise one to check the application of Industrial Photogrammetry.

  • PDF

Application of Photogrammetry Method to Measurement of Ground-Surface Displacement on the Slope (사면의 지표변위계측을 위한 사진측량기법의 적용)

  • Han, Jung-Geun;Bae, Sang-Ho;Oh, Da-Young
    • Journal of the Korean Society of Environmental Restoration Technology
    • /
    • v.4 no.3
    • /
    • pp.10-18
    • /
    • 2001
  • The existing measurement system to ground-surface displacement survey of the slope has been including the hazard for the measure in site and the difficulty for install, maintenance and control of expensive instruments, which are impossible of whole survey on the slope surface. To overcome of those defects, Softcopy Photogrammertry method is used, which can measure displacement of ground-surface on the slope and structure deformation vectors. Recently, the survey methods applying the advantages of Photogrammetry and Digital Photogrammetry Survey are widely used. In this study, therefore, the development and application of the new instrument mechanism on the the site example are studied. Through the application of Softcopy Photogrammetry, the 3-D data of ground surface on the dangerous slope could be effectively obtained at the long distance, which are obtained through the reform process of contour line. Those are different to the results of the Close-Range Photogrammetry analysis. In ground instrumentation parts, the new practical system shall be the technical base to improve of the instrument machine as well as can be widely applied in civil engineering and others branch.

  • PDF

Transmission Lines Rights-of-Way Mapping Using a Low-cost Drone Photogrammetry

  • Oh, Jae Hong;Lee, Chang No
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
    • /
    • v.37 no.2
    • /
    • pp.63-70
    • /
    • 2019
  • Electric transmission towers are facilities to transport electrical power from a plant to an electrical substation. The towers are connected using wires considering the wire tension and the clearance from the ground or nearby objects. The wires are installed on a rights-of-way that is a strip of land used by electrical utilities to maintain the transmission line facilities. Trees and plants around transmission lines must be managed to keep the operation of these lines safe and reliable. This study proposed the use of a low-cost drone photogrammetry for the transmission line rights-of-way mapping. Aerial photogrammetry is carried out to generate a dense point cloud around the transmission lines from which a DSM (Digital Surface Model) and DTM (Digital Terrain Model) are created. The lines and nearby objects are separated using nDSM (normalized Digital Surface Model) and the noises are suppressed in the multiple image space for the geospatial analysis. The experimental result with drone images over two spans of transmission lines on a mountain area showed that the proposed method successfully generate the rights-of-way map with hazard nearby objects.

Analysis of Three Dimensional Position According to Photographing Position in Close-Range Digital Photogrammetry (촬영위치에 따른 근접수치사진측량의 3차원 위치 해석)

  • Lee, Jong-Chool;Seo, Dong-Ju;Roh, Tae-Ho;Nam, Shin
    • Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
    • /
    • /
    • pp.181-186
    • /
    • 2003
  • As the approach close-range digital photogrammetry has a variety of merits, the application of precision requiting fields is in Increase for its scope expansion. In the meantime, in case of photographic surveying by use of films, a lot of studies on experiment analysis and theoretical forecast models about a change of the exactness as per photographing coordinates have been conducted, but experiments about approach close-range digital photogrammetry are not enough yet. In consequence, this study has made photographing respectively by changing the photographic distance, converging angle, picturing direction by use of Rollei d7 metric and d7 metric$\^$5/ that is a measurement digital camera. And also in order to minimize the errors happened at the relative orientation, we have sorted out the prototype target that the relative orientation is automatically on the programming and have calculated RMSE by carrying out the bundle adjustment. We think that such a study could be used as very important basic data necessary in deriving the optimal photographic conditions by the close-range digital photogrammetry and in judging such a degree.

  • PDF

A Study on the Determination of the Minimum Number of Control Points for Aerial Photogrammetry Using Simulated GPS Data (GPS 데이터 적용을 위한 항공사진측량 최소 기준점수 결정에 관한 연구)

  • 김용일;배태석
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
    • /
    • v.14 no.1
    • /
    • pp.89-95
    • /
    • 1996
  • As an attempt to apply GPS technique to aerial photogrammetry, an effort is exerted to replace the ground control points that were necessary in the traditional aerial photogrammetry with the aerial control by measuring the position of the camera exposure. In this study, various situations are simulated to test the conditions that affect the positioning of the points in aerial photogrammetry for the use of GPS data. From the result of the simulations, the necessary conditions and the applicable values to produce a 1:1, 000 topographical map were suggested. In the case of a photo block consists of 104 photos, we found a minimum of six ground control points make acceptable accuracy under the condition of below $10\mu{m}$ image positional error and with the ground observations.

  • PDF