• Title/Summary/Keyword: Electronic surveying

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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 Science
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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.

Comparing Efficiency of Numerical Cadastral Surveying Using Total Station and RTK-GPS (토탈스테이션과 RTK-GPS 측량을 이용한 수치지적측량의 작업효율성 비교)

  • Hong, Sung-Eon
    • Journal of Korean Society for Geospatial Information Science
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    • v.15 no.3
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    • pp.87-96
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    • 2007
  • In the numerical cadastral surveying field, the cadastral surveying would be measured with the Total Station surveying (electronic plane table surveying) system that consist the Total Station for surveying and the computing system for recording and editing the measured coordinates data by the TS. This study would suggest the advanced method, which is used on the RTK-GPS instead of TS for surveying and the computing system for handling the coordinates data and mapping. As a result of this study, although the measurement accuracy of the RTK-GPS and TS surveying make no greate difference, the suggested method reduces the cost of time and work force with the TS surveying. Besides, the new survey method would be more efficient due to directly handling the data and mapping in the field.

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A Study on Automated Production of Digital Cartographic Map by Electronic Tacheometer (전자식 태키미터에 의한 수치지형도의 자동제작에 관한 연구)

  • 최병길;조규전
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.14 no.2
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    • pp.249-253
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    • 1996
  • The development of electronic technology brings the advent of electronic tacheometer which measures, stores and records automatically angles and distances. Electronic tacheometer is the surveying equipment that enable the acquisition of the 3-D terrain information, construction of the database and automatic drafting of the cartographic map. This paper aims at studying the system which can produce automatically the digital cartographic map by us-ing the electronic tacheometer. For this study, cartographic maps of a region are produced by a plane table and an electronic tacheometer and these is analysed. The results of this study show that digital cartographic map by electronic tacheometer is much more accurate and efficient than cartographic map by plane table.

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The removable prosthetic restorations utilizing CAD/CAM system (임상가를 위한 특집 4 - CAD/CAM 시스템을 이용한 가철성 보철 수복)

  • Park, Ji-Man;Park, Eun-Jin;Kim, Seong-Kyun;Koak, Jai-Young;Heo, Seong-Joo
    • The Journal of the Korean dental association
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    • v.50 no.3
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    • pp.140-147
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    • 2012
  • Recently, the digital solution of fabricating removable prosthesis by applying haptic input device, electronic surveying, and rapid prototyping was introduced. This review article covers the concept of electronic surveying, computer-aided denture framework designing procedure, discussions after several digital denture cases, directions of future development, such as digital tooth arrangement and RP flasking.

Simultaneous Adjustment of Closed Traverse Net Considered the Observed Angle and Distance (측각과 측거를 고려한 개합트래버스망의 동시조정)

  • 이계학
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.8 no.1
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    • pp.51-56
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    • 1990
  • Recently, Electronic Distance Meter(EDM) is widely used for the traverse surveying and trilateration net. In this study, the closed traverse network is precisely adjusted by simultaneous adjustment of the observed angle and distance, using the Electronic Total Stations (Set 3). And also, it is examined that each kind accidental errors appear observed angles according to the observed distance and the number of repeating angle. In addition to the result, of checking between the simultaneous adjustment, the compass rule and transit rule, simultaneous adjustment in combination of the observed angle and distance is more accurate and effective than other adjustment.

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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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    • 2004.11a
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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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An Experimental Study on the Reliability of Electronic Distance Meter. (전자파거리측량기(EDM)의 신뢰성에 관한 실험적 연구)

  • 서채연;이계학
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.7 no.1
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    • pp.37-48
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    • 1989
  • Electronic Distance Meter(EDM) is widely used for the traverse surveying and trilateration net recently, therefore, the study on reliability of EDM is very important. In this study, the reliability of EDM is examined by calculating the distortion of traverse surveying net, statistically analyzing the results of side length between triangulation and trilateration. As the result of this study, correction equation of EDM and steel-tape is obtained. And also, linear regression equations with correlation coefficient (0.89-0.98) show resulting from the error analysis of each side length. In addition to checking the distortion of traverse surveying net, distortion calculated with correction EDM appears to be the smallest value.

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A Study on the Accuracy of Field DGPS Using Low-Cost GPS Receiver (저가형 GPS수신기를 이용한 현장 DGPS의 정확도에 관한 연구)

  • Song, Seok-Jin;Gang, Ho-Yun;Kim, Hui-Gyu;Kang, In-Joon
    • Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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    • 2007.04a
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    • pp.73-76
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    • 2007
  • The Global Positioning System(GPS)is an advanced navigation satellite system for determination to position. It can provide three-dimensional positioning, in dependent of weater, 24 hours per day. This paper described the Field DGPS program Using PDA can help a field work and compute the TM rectangular coordinates, compared the output of the Field DGPS program with the results of surveying using EDM(electronic distance measurement).

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Simulation of ND Filter for Terrestrial Laser Scanner (3차원 레이저 스캐너용 ND 필터의 시뮬레이션)

  • Yang, Soo-Hyo;Oh, Dong-Geun;Jeong, Joong-Yeon
    • Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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    • 2009.04a
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    • pp.65-73
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    • 2009
  • The terrestrial laser scanner measures the signal delay time of electronic circuit in EDM(Electronic Distance Measurement) Module for distance measurement. To measure signal delay time precisely, transmitting laser beam of terrestrial laser scanner is divided optically. Therefore, 10% of the laser beam power is entered into the electronic circuit and the others go out through lens. But, measure of delay time is severe in the laser scanner system that the laser beam power is changed dynamically by reflectance of a object, because characters like gain of electronic circuit involving APD(Avalanche Photo Diode) and so on are changed by incident laser beam. Therefore, we adapt ND(Neutral Density) filter that has grid pattern to the laser scanner system to keep constant the incident laser beam power. In this paper, we propose the simulation program for efficient design of ND filter pattern. Finally, to affirm simulation program, we conduct the experimental test of simulated ND filter that has linearly transmittance change, and we consider the experiment result.

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Study on Establishment of Cadastral Surveying Fee System Suitable for Digital Cadastral Management Environment (디지털 지적관리 환경에 적합한 지적측량수수료 체계 확립 연구)

  • Hong, Sung-Eon
    • Journal of Digital Convergence
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    • v.13 no.12
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    • pp.23-30
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    • 2015
  • The current cadastral business is being operated by conversion to a digital cadastral management system through computerized registers (land register and forest land register) and maps (cadastral map and forest cadastral map). Digital surveying methods, such as GPS surveying and electronic plane table surveying, are also used for cadastral surveying. At present, fees for cadastral surveying are calculated based on a standard pursuant to the Construction Standard Production Unit System and an announcement by the Ministry of Land, Infrastructure, and Transportation. In many cases, however, the cadastral surveying fee system announced at present fail to apply the digitalized environment depending on the item. This study sought to analyze the cadastral surveying fee system that requires improvement in the rapidly changing digital cadastral management environment, and to prepare a basis to establish a cadastral surveying fee system suitable to the digital environment by suggesting an improvement method for such system. As a result of the study, the following suggestions were made: a method of changing to terms suitable to the digital environment based on the current status analysis; preparation of a new estimation system regarding new estimation items; and re-survey of an estimation system of cadastral confirmation survey and preparation of an estimation system.