• Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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• 2003.04a
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• pp.139-144
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• 2003

3차원 이상의 공간정보의 생성은 우리가 살아가는 현실공간을 입체적으로 조망해 볼 수 있는 가장 일반적인 요구사항이 되었고, 이를 여러 분야에서 다각적으로 활용하려는 연구가 활발히 진행되고 있다. 또한 3차원 이상의 조건을 부여하여 시공간에서 동영상으로 보여주기 위하여 3차원 지형 시뮬레이션을 제작할 수 있는 기술이 보편화 되고 있어 건설분야에서도 적극적인 도입으로 각종 공사계획 및 설계에 이용할 예정이다. 본 연구에서는 이러한 지형공간데이터의 생성을 위하여 원격탐사 데이터와 수치지형도를 이용하여 우리나라 3차원 데이터의 자성 방법과 그 결과를 비교하였으며, 그 결과 DEM에 의한 3차원 수치 기복영상과 위성영상의 합성에 의한 퓨전 영상의 3차원 적용을 통하여 향후 고해상도의 적용시 발생할 수 있는 입체영상의 문제점등을 사전확인 할 수 있었다.

• Journal of Korean Society for Geospatial Information Science
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• v.18 no.2
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• pp.113-118
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• 2010

Recently, 3D-reconstruction for geographic information and study of geospatial information is progressing in various fields through national policy such as R&D business and pilot project. LiDAR system has a advantage of acquisition the 3D information data easily and densely so that is used in many different fields. Considering to characterist of the point data formed with 3D, it need a high specification CPU because it requires a number of processing operation for 2D form expressed by monitor. In contrast, 2D grid structure, like DEM, has a advantage on costs because of simple structure and processing speed. Therefore, purpose of this study is to solve the problem of requirement of more storage space, when LiDAR data stored in forms of 3D is used for 3D-geographic and 3D-buliding representation. Additionally, This study reconstitutes 2D-gird data to supply the representation data of 3D-geographic and presents the storage method which is available for detailed representation applying tree-structure and reduces the storage space.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.34 no.5
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• pp.1463-1476
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• 2014

In order to understand hydrodynamic and morphodynamic characteristics under wave-current interactions in an estuary, a coupled model for two-way analysis between existing 3-d numerical wave tank and newly-developed 3-d morphodynamic model has been suggested. Comparing to existing experimental results it is revealed that computed results of the newly-suggested model are in good agreement with each laboratory test result for wave height distribution, vertical flow profile and topographical change around ocean floor pipeline in wave-current coexisting field. Also the numerical result for suspended sediment concentration is verified in comparison with experimental result in solitary wave field. Finally, it is shown that the 3-D coupled Hydro-Morphodynamic model suggested in this study is applicable to morphological change under wave-current interaction in an estuary.

• Spatial Information Research
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• v.15 no.4
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• pp.363-370
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• 2007

This study has been carried for the development of the basic algorithm of helicopter navigation system based on TRN (Terrain Referenced Navigation) with information input from the GPS. The helicopter determines flight path due to Origination-Destination analysis on the Cartesian coordinate system of 3-D DTM. This system shows 3-D mesh map and the O-D flight path profile for the pilot's acknowledgement of the terrain, at first. The system builds TCF (terrain clearance floor) far the buffer zone upon the surface of ground relief to avid the ground collision. If the helicopter enters to the buffer zone during navigation, the real-time warning message which commands to raise the body pops up using Matlab menu. While departing or landing, control of the height of the body is possible. At present, the information (x, y, z coordinates) from the GPS is assumed to be input into the system every 92.8 m of horizontal distance while navigating along flight path. DTM of 3" interval has been adopted from that which was provided by ChumSungDae Co., Ltd..

• Proceedings of the Korea Contents Association Conference
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• 2009.05a
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• pp.485-487
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• 2009

The Spatial Image contents of Geomorphology 3-D environment is focused by the requirement and importance in the fields such as, national land development plan, telecommunication facility management, railway construction, general construction engineering, Ubiquitous city development, safety and disaster prevention engineering. The currently used DEM system using contour lines, which embodies geographic information based on the 2-D digital maps and facility information has limitation in implementation in reproducing the 3-D spatial city. Moreover, this method often neglects the altitude of the rail way infrastructure which has narrow width and long length. This As the results, We confirmed the solutions of varieties application for railway facilities management using 3-D spatial image contents and database design. Also, I suggested that U-city using topographical modeling about matching methods of high density elevation value using 3-D aerial photo with laser data are best approach for detail stereo modeling and simulation.

• Journal of Korean Society for Geospatial Information Science
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• v.3 no.1 s.5
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• pp.105-113
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• 1995

Three-dimensional landscape map is very useful in terrain analysis as it looks like real shape of terrain. When three-dimensional landscape map is needed, landscape photos achieved at a position of high elevation or by airplane are generally used. But, this approach can not fully satisfy the user's need to get pictures from various view points. In addition, because photos have some geometric displacement caused by the principle of central projection of camera, it is hard to get accurate locations from the photo. This paper aims to get three-dimensional landscape map similar to real terrain feature from vertical stereo aerial photos by digital photogrammetric techniques. This approach can provide a very useful data for three-dimensional terrain analysis as a function of Geo-Spatial Information System.

• Proceedings of the KSR Conference
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• 2003.05a
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• pp.321-325
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• 2003

The technology for the multi-dimensional terrain perspective view can be used as an important factors in planning and designing for the various construction projects. In this study, the stereo image perspective view has been generated for the multi-dimension analysis by combining useful digital map and remotely sensed satellite images. In the course of experimenting with the multi-dimensional topography generated by the combination of the front-projected image by the precise GCP and DEM from the contour line, the technology has been developed to offer the multi-dimensional access to the potential construction sites from the nearby main roads. This stereo image bird's eye view has made it possible to make multi-dimensional analysis on the terrain, which provides real time virtual access to the designated construction sites and will be a versatile application for development planning and construction projects.

• Journal of Korean Society for Geospatial Information Science
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• v.18 no.1
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• pp.63-72
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• 2010

In this study, an earth work design program which will improve the efficiency of earth work and enable to carry out the design using 3D Geospace-based earth work modelling in design stage was developed. Estimate of accurate earth work volume is achievable using 3D grid DEM, and based on this, a mass calculation chart was developed for movement of earth and equipment. In consideration for the resources for various construction equipments needed for civil engineering works, soil conversion and the passage is displayed. In addition, the result is restored in the form of open API-based KLM to make it possible for the users to identify the progress of the construction, thereby enhancing the intuitive understanding of three-dimensional visualization and making it easier to share the result of the analysis.

• 한국공간정보시스템학회:학술대회논문집
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• 2005.05a
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• pp.319-325
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• 2005

지리정보데이터는 공간개념을 가지고 있음에도 불구하고 대부분 2차원 평면 위주의 공간 자료로 이루어져 왔다. 그러나 GIS 데이터는 2차원 평면위주의 공간자료보다 3차원 공간자료를 기반으로 한 시각화를 통하여 다차원적인 분석이 가능해지고 있다. 최근 인터넷 환경에서 구동되는 3D GIS의 중요성이 인식되기 시작하였고, 3D GIS는 초기에는 지형을 단순히 3차원 가시화 하는 기능 위주에서 최근 3차원 지형분석, 3차원 도시, 3차원 시설물 등의 현실감 있는 모델링과 분석기능을 제공하는 단계는 물론, 가상현실 기능이 강조된 3D GIS까지 등장하는 단계에 이르렀다. 본 연구에서는 GIS 툴(ArcView)을 사용하여 대학캠퍼스의 부지, 구조물 및 시설물의 3D GIS를 구축할 수 있었으며 3D 모델링을 통해 다양한 각도에서의 조감도 작정과 경관분석을 행하였고 향후 시설물 확충에 따른 공간활용계획의 기본 자료로서 그 활용성을 검토하고자 하였다 이것은 GIS의 가장 발전적 형태인 Web GIS구축을 위한 인터넷 데이터베이스로서 정보 공유와 조회는 물론 사용자 측면의 분석까지 가능하도록 이용할 수 있다. 따라서 본 연구에서는 추후 웹 GIS 기법을 적용하여 캠퍼스의 3차원 관리를 위해 웹서버를 구축하고 2D를 기반으로 한 인터넷 맵의 한계를 벗어나 3D 모델링으로 웹상에서 사용자에게 다각도의 3차원 공간을 구현함으로써 2차원 데이터와 더불어 3차원 공간영상의 공유가 가능하도록 시도하고자 한다.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.21 no.2
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• pp.165-172
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• 2003

IKONOS satellite images are particularly well suited for stereo feature extraction. But, because IKONOS doesn't offer information about the satellite ephemeris and attitude, we have to use IKONOS RPC(Rational Polynomial Coefficients) data for 3-D feature extraction. In this study, it was intended to increase the accuracy and the efficiency in application of high resolution satellite images. Therefore, this study develop the program to extract 3-D feature information and have analyzed the geometric accuracy of the IKONOS satellite images by means of the change with the number, distribution and height of GCPs. This study will provide basic information for luther studies of the accuracy correction in IKONOS and high resolution satellite images.