• Journal of Korean Society for Geospatial Information Science
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• v.2 no.1 s.3
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• pp.93-98
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• 1994

This image of Kangseogu in Pusan, is a digital merge of aerial photos by scale of 1/1,200 map. The merge was carried out 2nd affine and bilinear interpolation. It can improve digital classification to help choose training sites and interprete classification results, and improve visual interpretation, as in this case, by adding detailed information to the multispectral TM data.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.23 no.3
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• pp.303-312
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• 2005

Digital map, DEM and orthophoto were produced by using PC based digital photogrammetric system and aerial photo images that were obtained with scale of 1/5,000 and scanning density of 1200dpi and 600dpi, and the accuracies of these outputs were evaluated by various methods. Non-skilled operator produced digital map with PC based digital photogrammetric system and aerial photo images scanned by 1200dpi. The results showed that it was impossible to insert contour lines, but the rest elements could be drawn with the accuracy of 1/1,000. In automatic generation of DEM, scanning density of aerial photo and grid interval of DEM didn't affect the accuracy of DEM. In production of orthophoto, we could know that the larger grid interval of DEM, the lower accuracy of orthophoto, but scanning density of original image had more effect on quality of orthophoto. By the way, accuracy comparison between orthophoto and digital map with same check points showed that orthophoto was more accurate than digital map, and orthophoto could be used in more diverse areas. Hereafter in civilian part, aerial photo image and PC based digital photogrammetric system could make practical application of data correction and update in GIS.

• Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
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• 2010.09a
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• pp.298-301
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• 2010

최근 디지털센서가 부착된 항공촬영용 디지털 카메라를 이용하여 수치영상을 취득하는 항공사진측량 방식을 적용하고 있다. 본 연구에서는 지형도제작의 가능성을 분석하기 위하여 1/5,000수치지형도 제작에서 면형방식 디지털카메라인 ULTRA-CAM영상과 촬영당시에 획득된 GPS/INS의 외부표정자료로부터 Direct Georeferencing기법을 적용하여 1/5,000수치지형도(수정)제작에 충분한 정확도를 확보할 수 있었다.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.41 no.5
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• pp.350-356
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• 2013

Photogrammetry has been widely used for measuring the important physical quantities in aerospace areas because it is a remote and non-contact measurement method. In this study, we analyzed photogrammetric error which can be occur in six degrees of freedom(6DOF) analysis among coordinates systems with single camera. Error analysis program were developed, and validated using geometric problem converted from imaging process. We analogized that the statistic from estimated camera pose which is need to 6DOF analysis is normally distributed, and quantified the photogrammetric error using estimated population standard deviation.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.8 no.1
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• pp.31-40
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• 1990

In this study, sample area was selected to compare the conventional method with photogrammetic method in basic planning of country club. Also various elements of planning, such as vegetation and water system, were considered through interpretation of aerial photographs and topographic maps, vegetation maps and water system maps were made as well as digital terrain models. These were used to analyse tophographic changes and landscape. As a result of comparing with the conventional method, it was shown that photographic interpretation could give more detail values than the conventional method, and that the digital terrain model could predict changes of topography, landscape and water system with more asccuracy. Consequently, the method of digital terrain model and photographic interpretation proved to be more effective than the conventional method in the case of water treatment, and planning of landscape and land utility.

• 한국공간정보시스템학회:학술대회논문집
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• 2005.05a
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• pp.327-331
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• 2005

본 연구의 목적은 공간데이터 구축시 아직까지 체계화되어 있지 않은 공간데이터의 품질 평가요소를 정립하는데 있다. 총 17개의 국내 공간데이터 품질관련 법규를 구축 공정, 작업방법, 장비, 정확도 등을 중심으로 분석하였다. 항공사진 촬영이 가능한 대규모 업체를 대상으로 작업순서, 사용장비, 작업순서 전후의 결과물의 정확도를 중심으로 조사하고 팀장급 직원들을 대상으로 현행 관련법규와 실무의 차이에 대하여 조사, 분석하였다. 조사, 분석한 내용을 기반으로 공간데이터의 구축공정을 항공사진을 이용한 수치지도 신규제작, 기존 수치지도 수정제작, 영상지도제작, 수치표고모델 구축 공정으로 구분하고, 각 공정별로 생성되는 공간데이터의 품질을 체크할 수 있는 요소들을 정립하였다.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.37 no.6
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• pp.571-577
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• 2019

Since the introduction of digital cameras in an aerial-photogrammetry field on 2006, the technological paradigm related to the photogrammetry has been shifting from the analog types to digital types. However, current construction standard cost for the aerial-photogrammetry and the digital mapping are being mixed with analog-based concepts and digital-based methods. In the current standard cost, the monthly weather table is closely related to the calculation of the number of flying days in a taking of aerial photograph. The current monthly weather table uses the results calculated from the observation data of total cloud amount from 1999 to 2007. In this study, the monthly weather table was calculated using the total cloud data during ten years from 2009 to 2018. As a result, the newly calculated number of clear days for 29 stations was analyzed as 44 days decreased by 6 days. The maximum number of clear days decreased in Jinju as 23 days, and the highest decreased clearing days was February.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.17 no.1
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• pp.11-19
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• 1999

Lately, with the development of the fields of computer and photogrammetry, Digital Photogrammetric Systems are widely used for the generation of GIS basemap, the acquisition of topographic information and DEM, the formation of digital orthophoto, three-dimensional viewing and so on. According as the demand for the systems is rapidly increasing, we suggest keenly the necessity of domestic technical development, because all of these systems depend on foreign technology until now. In this study, by using digital photogrammetry method, with Visual C++ language, we have developed Digital Photogrammetric Systems for Windows which is able to get three-dimensional coordinates through interior orientation, exterior orientation, epipolar line, image matching from a pair of aerial photos taken with metric camera. This system consists of not only a module which can revise digital map that is being made at National Geographic Institute as a part of data construction project of National Geographic Information System, but also a module which can view three-dimensional image on the screen monitor by using anaglyph for three-dimensional analysis. The digital photogrammetry modules developed in this study are expected to be used as primary modules for the effective management of the urban as well as main modules in developing professional digital photogrammetric systems.

• 한국지형공간정보학회:학술대회논문집
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• 2002.03a
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• pp.93-98
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• 2002

본 연구는 비교적 높은 정확도가 요구되지 않거나 짧은 시간 안에 수치기본도의 수정이 필요한 경우에 활용할 수 있는 기법을 개발하고자 하였으며, 인공위성 영상과 항공사진 및 지상사진 등 다양한 형태의 영상자료를 이용하여 지형도와 준공도면에서 누락된 자료를 보완하여 수치지도를 편집 갱신할 수 있는 가능성을 제시하였다. 또한, 기존의 대학 시설물 관리에 관한 연구가 시설물 DB 설계에 치중되어 있던 반면, 본 연구에서는 다중영상을 활용한 현황도 작성을 바탕으로 안내 및 관리 시스템을 구축함으로써 보다 많은 활용 가능성을 제시하였다.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.10 no.2
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• pp.25-30
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• 1992

Most algorithms in computer vision and digital photogrammetry assume that digital stereo pairs are registered in epipolar geometry. But, an aerial stereo pair is not likely to be in epiplar geometry since the attitude of the camera at the instant of exposure is different at every exposure station. In this paper, stereo digital imagery is obtained from aerial stereo pair by scanner. Then procesure to resample the digital imagery to epipolar geometry using exterior orientation elements after absolute orientation is described. As a result, a stereo imagery in epipolar geometry is produced from stereo digital imagery. Epipolar imagery in this paper is applied to the image matching method by digital image correlation technique. Then, a digital elevation model is produced from the result of image matching. The digital elevation model in this paper is compared to the other digital elevation model produced by analytical plotter. As a result, an economical method to generate digital elevation model is presented.