• Journal of Cadastre & Land InformatiX
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• v.51 no.1
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• pp.67-77
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• 2021

Spatial data is becoming very important as a medium that connects various data produced in smart cities, digital twins, autonomous driving, smart construction, and other applications. In addition, the rapid construction and update of spatial information is becoming a hot topic to satisfy the diverse needs of consumers in this field. This study developed a software prototype that can match the position of an image-based 3D building model produced without Ground Control Points using existing spatial data. As a result of applying this software to the test area, the 3D building model produced based on the image and the existing spatial data show a high positional matching rate, so that it can be widely used in applications requiring the latest 3D spatial data.

• Journal of the Korean GEO-environmental Society
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• v.15 no.6
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• pp.57-65
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• 2014

Recently, Construction business is changing from on the ground to underground space because of deficit of developing space, creation of green space and of incremental of land compensation expenses. Meanwhile, 3D Topographic, Marine and Cadastral maps need to have Spatial Interrelation. Also, understanding of the information is also needed. Spatial information object registration system is impossible to contact and understanding intelligence mutually because the former one is managed as automatic ID system. Therefore, 3D Object information ID System of underground space is managed based on Object Identifier. Construction of Spatial information integration ID System is required and it will offer Division Code (Ground, Index, Underground) and depth information. We are defined and classified Under Spatial Information in this paper. Moreover, we developed the integration ID System based on UFID for cadastral information Construction. We supposed underground spatial information DB Construction and a developed the way of exploiting 3D cadastral information system through the study. The research result will be the base data of Standard ID system, DB Construction and system Development of National spatial data which is considered together with spatial interrelation.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.31 no.2D
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• pp.335-342
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• 2011

Geotechnical Information which had been constructing and offering by Minister of Land, Transport and Maritime Affairs (MLTM) has been target on the whole of country. Today, the 100,000 number of geotechnical data has been managed as 2d GIS database. But, it is difficult to apply this database for analyzing and designing geotechnical works. In this paper, we have developed Geotechnical Information Application System (GIAS) based 3d geo-spatial information technique for the effective uses. First, GIAS based on GIS framework was implemented to effectively find out spatial geologic structure of study area. Second, we invited some experts from each field and listened their opinions. According to the surveying on the applicability-ratio, the experts showed higher interest in this system. In this study, it was verified that the 3d GIS-based system was very useful for the usability-ratio.

• Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
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• 2003.04a
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• pp.88-93
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• 2003

국토공간정보의 기반인 수치지도 제작을 위해서는 위치에 대한 정확한 정보가 요구되며 이러한 정보는 GPS를 이용한 방법이 대표시 되고 있다. 우리나라도 GPS를 이용한 위치결정 방법의 효율성과 정확성을 확보하기 위해 전 국토에 걸쳐 24시간 위성데이터를 취득할 수 있는 70여개의 GPS 상시관측소를 설치 운영하고 있다. 따라서 본 연구는 GPS 상시관측소 데이터의 효과적인 활용 방안을 모색하기 위해 행정자치부와 국리지리원에서 설치 운영하며 호남권에 위치한 5곳의 상시관측소를 대상으로 각기 고정위치를 달리하여 기선해석과 망조정을 수행하여 고정위치에 따른 3차원 절대좌표의 정밀도를 분석하였다. 현재 행정자치부의 3곳의 상시관측소 절대위치는 고시되지 않아 국립지리원 고시 성과를 기준으로 고시성과와 계산성과의 3차원 절대 좌표를 비교하였다.

• Journal of Cadastre & Land InformatiX
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• v.51 no.2
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• pp.185-198
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• 2021

Researches using UAVs are being actively conducted in the field of quickly constructing 3D spatial information in small areas. In this study, without using ground control points, a stereo camera was mounted on a UAV to collect images and quickly construct three-dimensional positions through image matching, bundle adjustment, and the determination of a scale factor. Through the experiment, when bundle adjustment was performed using stereo constraints, the root mean square error was 1.475m, and when absolute orientation was performed in consideration of a scale, it was found to be 0.029m. Through this, it was found that when using the data processing method of a UAV equipped with a stereo camera proposed in this study, high-accuracy 3D spatial information can be constructed without using ground control points.

• Korean Journal of Remote Sensing
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• v.35 no.5_1
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• pp.705-714
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• 2019

Precision positioning is necessary for various use of high-resolution UAV images. Basically, GCP is used for this purpose, but in case of emergency situations or difficulty in selecting GCPs, the data shall be obtained without GCPs. This study proposed a method of improving positional accuracy for x, y coordinate of UAV based 3 dimensional point cloud data generated without GCPs. Road vector file by the public data (Open Data Portal) was used as reference data for improving location accuracy. The geometric correction of the 2 dimensional ortho-mosaic image was first performed and the transform matrix produced in this process was adopted to apply to the 3 dimensional point cloud data. The straight distance difference of 34.54 m before the correction was reduced to 1.21 m after the correction. By confirming that it is possible to improve the location accuracy of UAV images acquired without GCPs, it is expected to expand the scope of use of 3 dimensional spatial objects generated from point cloud by enabling connection and compatibility with other spatial information data.

• Spatial Information Research
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• v.9 no.2
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• pp.325-340
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• 2001

This research is to construct more useful Geo-spatial data by building spatial data to three dimensional and utilize the database effectively for development of application, maintenance and management program, and application technology, which is on going based on “Haeundae three dimensional database construction project”. Furthermore, the acquisition of geographic information data and the technological improvement of effective construction would be the important factors to judge the qualitative reputation of GIS. Above all, studies to create accurate data and overcome the error limitation are much more important than any other thing. Final form of Spatial Data to materialize efficient GIS(Geographic Information System) must be three dimensional spatial data which has attribute data, actual concept and numerical value of real world. In connection to that, development is on the move to improve building technique of useful spatial data and digitalize the entire country in cryberspace. $\ulcorner the cyber country lrcorner$is designed to mange the entire country systematically. This simulation would be able to cover administration of government institution, public service, corporate business and even the public life in the cyeberspace though the computer. Materialization of efficient GIS and establishment of condition as technically strong nation through the early realization of $\ulcorner the cyber country lrcorner$will provide a great opportunity to open up the global market with exportation of advanced technology.

• Journal of Cadastre & Land InformatiX
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• v.53 no.1
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• pp.37-46
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• 2023

As real estate values rise, interest in cadastral resurvey is increasing. Accordingly, a cadastral resurvey project is actively underway for drone operation through securing work efficiency and improving accuracy. The need for utilization and management of cadastral resurvey results (drone images) is being raised, and through this study, a 3D spatial information platform was developed to solve the existing drone image management and utilization limitations and to provide drone image-based 3D cadastral information. It is proposed to build and use. The study area was selected as a district that completed the latest cadastral resurvey project in which the study was organized in February 2023. Afterwards, a web-based 3D platform was applied to the study to solve the user's spatial limitations, and the platform was designed and implemented based on drone images, spatial information, and attribute information. Major functions such as visualization of cadastral resurvey results based on 3D information and comparison of performance between previous cadastral maps and final cadastral maps were implemented. Through the open platform established in this study, anyone can easily utilize the cadastral resurvey results, and it is expected to utilize and share systematic cadastral resurvey results based on 3-dimensional information that reflects the actual business district. In addition, a continuous management plan was proposed by integrating the distributed results into one platform. It is expected that the usability of the 3D platform will be further improved if a platform is established for the whole country in the future and a service linked to the cadastral resurvey administrative system is established.

• Proceedings of the Korea Water Resources Association Conference
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• 2009.05a
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• pp.1717-1722
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• 2009

국토공간정보 녹색뉴딜사업의 일환으로 전국을 대상으로 실시되고 있는 국토정보화 사업은 국토의 현실 세계와 동일한 환경 구현을 목적으로 위성영상, 항공사진, 3차원 모델링, 라이다, 유비쿼터스 등 다양한 공간정보기술이 접목되고 있다. 본 연구는 고해상 위성영상 중 현재 가장 많이 상용화가 된 위성영상과 항공사진 영상지도서비스를 대상으로 하천 시설물 현황 파악을 실시하여, 가장 효과적인 방안을 도출하여 기존의 문제점을 해결하고자 한다. 이를 위해 가장 먼저 영상지도서비스 현황분석과 하천 시설물 중 가장 많이 실무에 활용되고 있는 하천 시설물 현황을 파악하여 영상별 시설물 판독을 비교하였다. 하천 시설물 판독에 가장 적합한 영상지도서비스는 시설물 판독뿐만 아니라 시스템화하여 체계적이고 과학적인 시설물 관리가 가능한 시스템 개발을 통해 활용성 극대화 방안을 모색하고자 한다.

• Spatial Information Research
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• v.19 no.3
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• pp.33-42
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• 2011

Since the method of generating 3D Spatial Information using aerial photographs was introduced, lots of researches on effective generation methods and applications have been performed. Nadir and oblique imagery are acquired in a same time by Pictometry system, and then 3D positioning is processed as Multi-Looking Camera procedure. In this procedure, the number of GCPs is the main factor which can affect the accuracy of true-orthoimage. In this study, 3D positioning accuracies of true-orthoimages which had been generated using various number of GCPs were estimated. Also, the standard of GCP number and distribution were proposed.