• Title, Summary, Keyword: surveying

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Accuracy Evaluation of Cadastral Surveying using Data of Parcel Based Land Information System (필지중심토지정보시스템 자료를 이용한 지적측량 정확도 평가)

  • Ju, Jeong-Jun;Kim, Seong-Sam;Yoo, Hwan-Hee
    • Journal of Korean Society for Geospatial Information System
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    • v.12 no.3
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    • pp.23-31
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    • 2004
  • Cadastral surveying is related to demarcating legal boundaries and areas for the sake of registering a properly on cadastral records or restoring registered boundaries on the ground. It is composed of control surveying (cadastral triangulation and supplementary control surveying) and detail surveying. Detail surveying is classified into plane table surveying by graphical cadastral map and numerical surveying by boundary point coordinates. In this study we compared the accuracy of plane table surveying with numerical surveying using Parcel Based Land Information System(PBLIS) data constructed by the cadastral map digitalization business. In conclusion the result by numerical surveying was analyzed as more accurate than the result of plane table surveying, as Root Mean Square Errors(RMSE) of graphical cadastral surveying is 0.766m and that of numerical cadastral surveying using Total Station(T/S) is 0.683m. Therefore, PBLIS data is expected to be used for surveying legal boundaries and areas in the near future.

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Present and Future Vision of Surveying and Geospatial Information System in Korea

  • YEU, Bock-Mo;SOHN, Duck-Jae
    • Korean Journal of Geomatics
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    • v.3 no.2
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    • pp.87-91
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    • 2004
  • Surveying and GIS have increasingly contributed to improve the quality of humane life through the development of its technology. While the surveying professions are now experiencing the crisis of identity. In this paper, we aim to study the concepts and presence of newly used terminologies, present state and future vision of surveying and GIS in Korea. To cope with various surveying consumers for expanding the market and their demands, enhancement of educational system, complement of laws legal system, construction of cooperative system in business are basically required.

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A Study on the Accurate 3D Terrain Model Using GPS and EDM (GPS와 EDM을 이용한 정밀 3차원 지형구축)

  • 곽영주;장용구;김상석;강인준
    • Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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    • pp.99-104
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    • 2004
  • Recently, the old surveying method for acquiring surveying-geo information results had a low economic efficiency and a low dependence of precision because it took much times and high costs. So, we acquired law data by execution of control surveying through Static positioning of DGPS(Ashtech). It is computed plainmetric(X, Y) positioning through postprocessing by Prism S/W. And we computed height(Z) through control surveying by ring-closed leveling surveying. After control surveying execution, we built DEM(Digital Elevation Model) using LDT S/W and accuracy 3D detail surveying by EDM(Electronic Distance Measurement) surveying. The purpose of this study was to yield automated digital mapping and the automated amount of materials using ahead data. The conclusions were as follows; First, we built the automated amount of materials system and got high efficiency about personnel, times and precision. Second, when, people precisely positioned on railroads of a high-speed railroad and used GPS surveying, the result was permitted. Finally, it was possible to draw automated profile and cross-section using the 3D terrain model build with the DEM technique.

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Development of Positioning System Based on Auto VRS-GPS Surveying

  • Choi, Hyun;Kim, Young-Jong;Park, Woo-Sik
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.32 no.3
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    • pp.253-259
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    • 2014
  • There has been a need for replacing human labors with a robot in such dangerous and hard jobs of various construction sites. For that reason, many researches have been made about the high quality robot, which performs its duty instead of human labors. This study is about auto surveying system development based on VRS-GPS which enables autodriving in dangerous areas where it's difficult for humans to measure directly. This study is about the auto-surveying system development, based on VRS-GPS, which enables auto-drive in dangerous areas, whereas difficult for humans to measure directly. The GPS is made with GRXI and SHC250 controllers of the SOKKIA company. The auto surveying system is composed of DPS module, geomagnetism sensor, bluetooth, gimbals, IMU, etc to automatic drive via enter into a route of position. The developed auto surveying system has installed the carmeras for front and vertical axis as well as systems to grasp situation of surveying with smartphone in real time. The result from analysed RMSE of auto surveying system and VRS-GPS surveying is 0.0169m of X-axis and 0.0246m of Y-axis.

Downtown Area Cadastral Boundary Surveying Using Real-time GPS/GLONASS Combination

  • Seo, Dong-Ju;Kim, Sung-Hwan;Lee, Jong-Chool
    • Korean Journal of Geomatics
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    • v.3 no.1
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    • pp.73-79
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    • 2003
  • To manage national territory and cadastral data efficiently, accuracy and cost-efficiency in cadastral boundary surveying is inevitable. The efficient management of cadastral data is a very important element in national land management. Survey techniques are being introduced. Recently, improvements in survey techniques have been made with the development of satellite surveying, Allowing accurate and fast surveys. If we can calculate the output accurately in real-time in survey fields, it will open a new method in cadastral detail surveying. According to the classification on Law of cadastral surveying, Cadastral surveying can be divided into cadastral control point surveying and cadastral detail surveying. The control point survey can be divided into cadastral triangulation surveying and cadastral traverse surveying. The detailed survey is usually perform by plane surveying. Among these, cadastral detail surveying will be reviewed in this study. In this study, the combination of the satellites, such as US managed GPS and Russian managed GLONASS was used. In the satellite survey in downtown, data interruption symptoms arose(according to the mask angle of the satellite). Therefore; we combined the satellites to get date more accurately. A block of Haewoondae New City in Busan, Korea, which has Numerical Cadastral Law was selected as the sample area for this study. Block II and III are surrounded by high rise apartments. One side of Block I and IV is level ground and the other side is full of high rise apartments. Especially, Block II is surrounded by high rise apartment houses with 20 meters width. In the results of the study Block II did not satisfy the allowable precision, while Block I, II and IV satisfied the allowable precision of the enforcement regulations of Cadastral Law. Therefore, it is judged that the traditionally used Total Station method should be used for supplementary survey on Block II, in stead.

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A Legal Study on Boundary Relocation Surveying (경계복원측량에 관한 법적 고찰)

  • Shin, Gook Mi
    • Journal of Cadastre & Land InformatiX
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    • v.47 no.2
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    • pp.61-78
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    • 2017
  • When a boundary dispute occurs between landowners of adjoining lands, a court deals with a boundary violation on the basis of cadastral register. Boundary relocation surveying is one which reconstructs a boundary in cadastral register on actual land. Boundary relocation surveying includes most of surveyings related with the civil case such as restoration of land and demolition of building and a surveying result affects a ruling critically. However, boundary relocation surveying depends on surveying technician's knowledge and experiences and can lead to different surveying results. This study reviews legal principles of boundary relocation surveying by analyzing law practice of boundary relocation surveying which is used for solving a boundary dispute between landowners of adjoining lands and by examining related laws and Supreme Court precedents. The study seeks to contribute to consistent and reliable results of surveying by leading surveying technician to carry out a boundary relocation surveying on the basis of judicial doctrines.

A Study on the Site Calibration of Network RTK Surveying (네트워크 RTK 측량의 사이트 캘리브레이션 방안에 관한 연구)

  • Choi, Han Jun;Lee, Byoungkil;Yeon, Sang Ho
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.31 no.1
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    • pp.99-107
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    • 2013
  • With the expansion of the development and use of surveying equipment recently, by the establishment of infrastructure for network RTK surveying of the NGII, network RTK surveying has been widely used in surveying industry. Currently, in public surveying regulations, site calibration with minimum 5 evenly spaced bench marks is needed for using network RTK surveying results as leveling. But the range between and the number of bench marks for site calibration can be varied according to the geoid undulation. In this study, in order to verify this, Incheon area having regular geoid undulation and Taebaek area having irregular geoid undulation are selected as study area and network RTK surveying have been done. Then the accuracy of site calibration by range between and the number of bench marks have been compared. As a result of this study, in order to meet a tolerance of vertical precision (0.1m) that has been set in public surveying regulations, there is a necessity for improving the regulations so that the range and number of bench marks, to be used for site calibration of network RTK surveying, can be applied complementarily.

Accuracy Analysis of Network RTK Surveying for Cadastral Re-survey Project (지적재조사사업에서 Network RTK 측량의 적용 정확도 분석)

  • Park, Chun Soo;Park, Ki Heon;Hong, Sung Eon
    • Journal of Korean Society for Geospatial Information System
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    • v.21 no.4
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    • pp.117-123
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    • 2013
  • The purpose of this research is to suggest the reasonable method of Network RTK surveying in future cadastral re-survey project through the accuracy analysis about Network RTK surveying achievement and the conventional TS-based confirmation surveying. To achieve it, we selected the experiment places and succeeded in achieving the result by Network RTK surveying about total of 307 parcel boundary point. We compared it with the result of confirmation surveying for cadastral, and it was shown that total connection errors of RMSE was ${\pm}0.1028m$ and total 48 places exceeded in the cadastral re-survey allowable error tolerance. The research suggested the practical alternatives in cadastral re-survey project after the comprehensive evaluation of those analysis results. Therefore, the author suggested development and adoptation of integrated electronic plane table surveying method. Moreover, we suggested unifying the first parcel boundary point method into the total station surveying and adopt the Network RTK surveying on the cadastral surveying inspection.

Improvement of Positioning Accuracy in Realtime VRS Surveying (VRS 측량에 의한 실시간 위치 정확도 향상 방안)

  • 이준석;강인준;곽재하;강문수
    • Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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    • pp.123-126
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    • 2003
  • In this study we investigate japan VRS system comparing VRS and RTK. and real time VRS surveying and RTK-GPS surveying field test. The pilot VRS surveying project have been done to verify a new technology accuracy and efficiency and we also derived future research and work in korea from that studying.

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