• Title, Summary, Keyword: 사진측량

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Accuracy Analysis of Aerial Triangulation using UltraCamX which is Airborne Digital Camera (항공디지털카메라 UltraCamX의 사진기준점 정확도 분석)

  • Lee, Jae-One;Na, Jong-Gi;Jung, Chang-Sik;Bae, Kyoung-Ho
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.27 no.2
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    • pp.177-186
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    • 2009
  • Nowadays, as going to information society based knowledge, the informations are acquired, processed, serviced based digital environment. In surveying field, the trend have been changed from the analog foundation to the digital foundation. Also, aerial photogrammetry is being changed from analog aerial photogrammetry to digital aerial photogrammetry. In this paper, the analysis of accuracy is performed for the comparison of traditional aerial photogrammetry with digital aerial photogrammetry usign UltracamX in AT and Block Adjustment. As the results, Bundle adjustment in digital aerial photogrammetry with GPS/INS have more advantages than traditional independent adjustment in analog aerial photogrammetry. Digital aerial photogrammetry contributes the higher accuracy in AT and block adjustment more than analog aerial photogrammetry.

A Study on Accuracy of Position Analysis by Non-metric photo (비측량용 사진에 의한 위치해석의 정확도 연구)

  • 이종출;이병걸;심봉섭
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.13 no.1
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    • pp.95-106
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    • 1995
  • The purpose of this study is to analyse the accuracy of non-metric photos by close-range photogrammetry. Close-range photogrammetry using non-metric photos is 'economical and convenient to handle, but it is insufficient of study on accuracy. To execute this study, first, the terrain model was made and then taken photographs of this model with metric and non-metric cameras. The Bundle adjustment and the Direct linear transformation methods are used for the analysis close-range photogrammetry. The results of the analysis showed that the Bundle adjustment method is a appropriate method for the analysis of the non-netric photo. Therefore, we concluded that the accuracy of the non-metric photo by close-range photogrammetry is applicability for the photogrammetry.

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The Generation of Accurate Digital Orthophoto by DTM Accuracy Improvement (DTM의 정확도 향상에 의한 정밀 수치정사사진 생성)

  • 박운용;이기부;정성모;이인수
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.16 no.2
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    • pp.243-250
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    • 1998
  • From early plane-table photogrammetry through the analog and analytical stages, photogrammetry has now reached the digital photogrammetry stage using the image stored at computers. Digital Photogrammetry using aerial photograph generates the DTM and digital orthophoto. Expecially, DTM is important for improving the accuracy of digital ortho photo. so Many experimental are required. In this study, therefore deals with the generation process of digital orthophotos using DTM with breakline and without breakline.

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Digital Photogrammetry and Its Role in GIS

  • 조규전;조우석
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.14 no.1
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    • pp.1-7
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    • 1996
  • The idea of digital photogrammetry was first introduced into the photogrammetric community in early 1960s'. At that time, it was impossible to implement the idea due to inferior computer and digital image processing technology With the recent advancements in computer hardware/software and image processing techniques, digital photogrammetry has made its entry into the field of photogrammetry. The advent of digital photogrammetry also resulted from the increasing amount of digital data acquired through satellites, CCD cameras and digital scanning of photographs. Obviously, the major distinction between conventional photogrammetry and digital photogrammetry lies in the nature of primary input data (analogue versus digital), which could lead to a fully automated digital photogrammetric workstation. However, since digital photogrammetry is in its infant stage, virtually every task is an unsolved problem due to lack of understanding of theories and techniques. Upon considering the increasing demand of efficient digital mapping method and economical GIS database generation, the union of GIS and digital photogrammetry becomes ever clear. In this paper, the author addresses the current status of digital photogrammetry such as digital imagery and digital photogrammetric workstation as well as the role of digital photogrammetry in GIS.

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무인항공기를 이용한 해안선변화조사 사례 소개

  • An, Do-Gyeong;Kim, Tae-Hwan
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • pp.144-146
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    • 2019
  • 과거의 해안선조사방법으로는 GNSS가 도입되면서 크게 발전하여 위성측위기를 이용한 현장조사방법과 항공기를 이용한 사진측량 방법이 조사의 주를 이루었다. 그러나, 현재 무인항공기(UAV)를 이용한 저고도 정밀조사 방법이 도입되어 무인항공기를 이용한 정밀사진측량이 가능하게 되었다. 무인항공기 정밀사진측량은 기존 조사방법과 비교시 저비용, 고정밀 성과를 취득 할 수 있다. 무인항공기 정밀사진측량은 해안선변화조사에 적용되어 무인항공기 정밀사진측량에서 취득된 고정밀 정사영상 및 수치표면모형(DSM)자료를 이용해 해안선을 추출하고 해안선변화 지역을 분석하는 자료로 활용되고 있다. 2016년도부터 우리나라 해안선변화조사 사업에 무인항공기를 이용한 조사가 실시되고 있으며 추후 여러 다방면으로 무인항공기를 이용한 다양한 조사가 이루어 질것으로 기대 된다.

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Techniques of deformations measurement in Electric Power structure by using Close Range Photogrammetry (근거리사진측량을 이용한 전력구조물의 미소변위 측정기법)

  • 김감래;김명배
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.12 no.1
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    • pp.77-87
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    • 1994
  • One of the often espoused merits of close-range photogrammetry is the effectiveness of the method for measuring non-accessible objects of unusual and complex shape. In this study, techniques of deformation measurement using close-range photogrammetry for electric power structures were developed. Absolute deformation could be found efficiently through close-range photogrammetry in the structure deformation analysis based on time variation. Also, feasibility of the structures management system was presented based on this study.

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A Study on the Accuracy Evaluation of UAV Photogrammetry using Oblique and Vertical Images (연직사진과 경사사진을 함께 이용한 UAV 사진측량의 정확도 평가 연구)

  • Cho, Jungmin;Lee, Jongseok;Lee, Byoungkil
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.39 no.1
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    • pp.41-46
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    • 2021
  • As data acquisition using unmanned aerial vehicles is widely used, as one of the ways to increase the accuracy of photogrammetry using unmanned aerial vehicles, a method of inputting both vertical and oblique images in bundle adjustment of aerial triangulation has been proposed. In this study, in order to find a suitable method for increasing the accuracy of photogrammetry, the accuracy of the case of adjusting the oblique images taken at different shooting angles and the case of adjusting the oblique images with different shooting angles at the same time with the vertical images were compared. As a result of the study, it was found that the error of the checkpoint decreases as the angle of the input oblique images increases. In particular, when the vertical images and oblique images are used together, the height error decreases significantly as the angle of the oblique images increases. The current 『Aerial Photogrammetry Work Regulation』 requires RMSE (Root Mean Square Error), which is the same as GSD (Ground Spatial Distance) of a vertical image. When using an oblique images with a shooting angle of 50°, a result close to this standard is obtained. If the vertical images and the 50° oblique images were adjusted at the same time, the work regulations could be satisfied. Using the results of this study, it is expected that photogrammetry using low-cost cameras mounted on unmanned aerial vehicles will become more active.

A Study on Efficient Self-Calibration of a Non-Metric Camera for Close-range Photogrammetry (근접 사진측량을 위한 효율적인 비측정카메라 캘리브레이션)

  • Lee, Chang No;Oh, Jae Hong
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.30 no.6_1
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    • pp.511-518
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    • 2012
  • It is well-known that non-metric digital cameras have to be calibrated for the close-range photogrammetry. But, the self-calibration is still not an easy task because it requires rather a large calibration site of accurate control points, multiple image acquisitions in different positions, and accurate image point measurements that are quite labor-intensive and time-consuming. Based on the premise, this study carried out check point accuracy analysis from self-calibration of different control point designs and photo combinations. The test results showed that the calibration using three photos covering three-dimensional control points produced high accuracy, but control points on a plane could attain the comparable accuracy with four photos including a 90-degree rotated photo. We then compared the target accuracy of on-site self-calibration using flat control points to that of laboratory-self calibration and observed comparable results.

Estimation of Bed Elevation of a Shallow River Using the Digital Aerial Photos (디지털 항공사진을 이용한 수심이 얕은 하천의 하상고 산정)

  • Lee, Chan Joo
    • Proceedings of the Korea Water Resources Association Conference
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    • pp.383-383
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    • 2015
  • 하천의 하상고 측량은 하상변동 분석, 서식처 구조 등을 이해하는데 매우 중요한 정보를 제공한다. 하지만, 현재까지 대부분의 하상고 측량은 일정한 간격의 하천 단면 측량에 의해서 행해져 왔다. 최근 GPS와 다중 빔 측심기를 이용하여 하상의 3차원적 형상을 조밀하게 측량하고 있으나 비용이 많이 들기 때문에 긴 하천 구간을 전부 측량하지는 못하고 특정한 부분에 대해서만 집중하고 있다. 항공 LiDAR의 경우 넓은 지역에 대해 신속하고 고해상도로 지형을 측량할 수 있으나 수중 투과 장비가 고가이며, 일반 적색 레이져 기반 LiDAR는 수중을 측정하지 못하여 하상 측량에 한계가 있다. 이에 대한 대안으로 활용할 수 있는 방법은 광학 기반의 원격 탐사에 의한 수심 측량 방법이다. 이 방법은 얕은 수심의 하천에 대한 활용되었는데, 광학 센서 이미지나 항공사진 등을 이용한다. 본 연구에서는 저고도에서 촬영한 고해상도 디지털 항공사진을 이용하여 모래하천의 수심을 추정하였다. 이 방법은 항공사진의 적색 및 녹색 색상값과 현장에서 정밀한 측위 하에 측량한 수심값 사이의 관계를 이용한다. 이를 통해 보정식을 수립하고 검사 자료를 이용하여 검증한 후 항공사진의 해당 지역에 대해 수심 부분을 마스킹 처리하여 하상고를 구축하였다. 검사 자료에 대한 RMSE는 약 12 cm로 나타났다. 이를 활용하여 대상 구간의 3차원적 지형 형상을 구축하였다.

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A Study on the Automation of Interior Orientation and Relative Orientation (내부표정과 상호표정의 자동화에 관한 연구)

  • Jeong, Soo;Park, Choung-Hwan;Yun, Kong-Hyun;Yeu, Bock-Mo
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.17 no.2
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    • pp.105-116
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    • 1999
  • Owing to the rapid development of computer system and the introduction of image processing technique, recent photogrammetric studies have been concentrated on the automation of photogrammetric orientation work that have been carried out by skilled professionals in analog and/or analytical pbotogrammetric field. To automate the whole photogrammetric work, the automation of the orientation processes including interior, relative and absolute orientation should be preceded. This study aims to automate interior orientation and relative orientation process. For this purpose, we applied Hough transform to interior orientation process and object space matching technique to relative orientation process. As the result of this study, we can present a method to automate interior and relative orientation process that has been semi-automatically operated in most commercial digital photogrammetric workstations currently available.

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