scholarly journals Aspects Regarding the Tracking of the Behavior in Time of Vâlsan Dam, Arges County, Romania

2017 ◽  
Vol 74 (2) ◽  
pp. 176
Author(s):  
Vlad PĂUNESCU ◽  
Tudor SĂLĂGEAN ◽  
Mariana CĂLIN ◽  
Anca Maria MOSCOVICI ◽  
Elemer Emanuel SUBA ◽  
...  
Keyword(s):  
Measurement Accuracy ◽  
Field Measurements ◽  
Hydrotechnical Construction ◽  
Total Station

This paper aims to highlight the behavior in time monitoring of a hydrotechnical construction by establishing the displacements compared to the base tranche and the previous tranche, processing these measurements and establishing conclusions on the behavior of the analyzed construction. The main purpose of this paper is to study if there are any displacements of the studied hydrotechnical construction between different measurements tranches. Field measurements were performed between September - December 2016, after which the data was processed at the office with specially developed programs for this purpose. For the micro-triangulation stage, respectively for measuring the directions and distances, were used Leica TS02 Plus R500 total stations. The measurement accuracy of this total station is 1” for directional determination and 1.5mm + 2ppm for distances. Tracking the behavior in time of hydrotechnical constructions are of great importance, because it can prevent many calamities like breaking the dam, floods etc.

scholarly journals An updated and quality controlled surface mass balance dataset for Antarctica

2012 ◽  
Vol 6 (5) ◽  
pp. 3667-3702 ◽  
Author(s):  
V. Favier ◽  
C. Agosta ◽  
S. Parouty ◽  
G. Durand ◽  
G. Delaygue ◽  
...  
Keyword(s):  
Quality Control ◽  
Mass Balance ◽  
Measurement Accuracy ◽  
Field Measurements ◽  
Spatial Density ◽  
Surface Mass Balance ◽  
West Antarctica ◽  
Surface Mass ◽  
Data Gaps ◽  
The Antarctic

Abstract. We present an updated and quality controlled surface mass balance (SMB) database for the Antarctic ice sheet. We retrieved a total of 5284 SMB data documented with important meta-data, to which a filter was applied to discard data with limited spatial and temporal representativeness, too small measurement accuracy, or lack of quality control. A total of 3438 reliable data was obtained, which is about four times more than by applying the same data filtering process to previously available databases. New important data with high spatial resolution are now available over long traverses, and at low elevation in some areas. However, the quality control led to a considerable reduction in the spatial density of data in several regions, particularly over West Antarctica. Over interior plateaus, where the SMB is low, the spatial density of measurements remained high. This quality controlled dataset was compared to results from ERA-Interim reanalysis to assess model representativeness over Antarctica, and also to identify large areas where data gaps impede model validation. Except for very few areas (e.g. Adelie Land), the elevation range between 200 m and 1000 m a.s.l. is not correctly sampled in the field, and measurements do not allow a thorough validation of models in regions with complex topography, where the highest scattering of SMB values is reported. Clearly, increasing the spatial density of field measurements at low elevations, in the Antarctic Peninsula and in West Antarctica remains a scientific priority.

Vertical refraction determination using a Trimble S9 total station

2020 ◽  
Vol 954 (12) ◽  
pp. 2-9
Author(s):  
D.V. Dementiev ◽  
I.M. Zhukov ◽  
M.Y. Karavanov ◽  
I.I. Ranov ◽  
N.Yu. Litvinov
Keyword(s):  
Atmospheric Turbulence ◽  
Turbulent Atmosphere ◽  
Measurement Accuracy ◽  
Dynamic Method ◽  
Experimental Studies ◽  
High Accuracy ◽  
Measuring Instruments ◽  
Total Station ◽  
The Real

Classical methods for determining refraction are based on Newton’s formulae for a statically stable atmosphere. However, they do not provide the required measurement accuracy due to random changes in refraction, caused by the influence of atmospheric turbulence. The aim of this work is to study the dynamic method for determining refraction in a turbulent atmosphere. The measurements were performed with a Trimble S9 total station. It was found out, that within a few seconds the angle of vertical refraction can change by dozens of arc seconds. To improve the accuracy of the results, it is necessary to determine the refraction instantly for a specific moment of observation and for a particular path, otherwise the obtained corrections will not correspond to the real angle of refraction. The introduction of a dynamic method for determining refraction requires more extensive experimental studies under various observation conditions. In the case of confirmation of the high accuracy of the dynamic method for determining the fraction, significant prospects open up for taking refraction into account and developing new more effective measuring instruments in a turbulent atmosphere.

scholarly journals Feasibility study of high-precision trigonometric elevation replacing second-order level in tunnel penetration control survey

2020 ◽  
Vol 165 ◽  
pp. 04022
Author(s):  
Zhang Hongfeng
Keyword(s):  
Measurement Error ◽  
High Precision ◽  
Feasibility Study ◽  
Error Propagation ◽  
Measurement Accuracy ◽  
Second Order ◽  
Total Station ◽  
Level Measurement ◽  
Control Survey ◽  
Elevation Measurement

Based on the principle of trigonometric elevation measurement and the law of error propagation, the trigonometric elevation formula is derived in this paper. The factors that cause the trigonometric measurement error are analyzed accurately. It is considered that the use of a high-precision total station for the trigonometric elevation measurement under opposite conditions can reach the second-order level measurement accuracy.

scholarly journals Non-Destructive Testing of the Longest Span Soil-Steel Bridge in Europe—Field Measurements and FEM Calculations

Materials ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 3652 ◽  
Author(s):  
Mikołaj Miśkiewicz ◽  
Bartosz Sobczyk ◽  
Pawel Tysiac
Keyword(s):  
Laser Scanning ◽  
Laser Scanner ◽  
Field Measurements ◽  
Load Test ◽  
Steel Bridge ◽  
Good Correspondence ◽  
Total Station ◽  
Non Destructive ◽  
Inductive Sensors

The article describes interdisciplinary and comprehensive non-destructive diagnostic tests of final bridge inspection and acceptance proposed for a soil-steel bridge made of corrugated sheets, being the European span length record holder (25.74 m). As an effect of an original concept a detailed and precise information about the structure short-term response was collected. Periodic diagnostics of bridge deformations was done one year after it was built. Load test design was based on numerical simulations performed by means of finite element method (FEM). In situ measurements were done with the aid of: inductive sensors, optical total station, and terrestrial laser scanner. The results produced by terrestrial laser scanning were used to build a precise image of structure deformation in 3D space during the tests. The accuracy of laser mapping was significantly increased using the information coming from total station and inductive sensors. These have higher accuracy and therefore can be used as reference. Thus, new quality in measurements is introduced. Good correspondence between in situ values and FEM estimations was achieved. Therefore, such a combination of testing methods can be used in non-destructive diagnostics of structures and is an interesting alternative for the standard approach, in which the measurements are done in limited number of points.

scholarly journals Stage of Potential Identification Irrigation Channel Topography Analysis for Micro-Hydro Power in the Kalibawang Irrigation Primary Channel, Yogyakarta, Indonesia

2021 ◽  
Vol 16 (5) ◽  
pp. 953-964
Author(s):  
Masrur Alatas ◽  
Maria Theresia Sri Budiastuti ◽  
Totok Gunawan ◽  
Prabang Setyono
Keyword(s):  
Selection Criteria ◽  
Field Measurements ◽  
Initial Study ◽  
Google Earth ◽  
Hydro Power ◽  
Total Station ◽  
Irrigation Channel ◽  
Irrigation Channels ◽  
Data Requirements ◽  
Primary Channel

This study was designed to determine the stages in the identification of micro-hydro in irrigation channels based on the classification and level of data requirements in a project, starting from the initial study, feasibility study and detailed engineering design. The study was conducted with site selection criteria using four information systems and technology tools, namely Google Earth, GIS Topography, UAV Drone Phantom DJI 4, and Nikkon DTM 332 Total Station. The results shows through GE and GIS, obtained 23 potential points, 7 of which are high potential, followed by field measurements with 1 selected UAV location Cascade, and detailed with TS to produce Head (H) 12 m, with CM and FDC probability 75% discharge (Q) 5.5 m3/s, generated power (P) 550 kW. This study provides a method and solution for speed in identifying potential with Google Earth and GIS (Macro Class), speed and risk reduction for surveyors with UAVs (Mezo Class), and accuracy and detailing at selected locations with Total Station (Micro Class). So that this research provides accuracy in the stages, methods and tools used in the identification of micro-hydro potential in irrigation channels.

scholarly journals The Improvement and application of elevation measurement method with total station

2020 ◽  
Vol 165 ◽  
pp. 03018
Author(s):  
Yiteng Xu ◽  
Xin Zhao ◽  
Hewen Liu ◽  
Feng Xu ◽  
Xiaoqiang Wang
Keyword(s):  
Mathematical Model ◽  
Measurement Error ◽  
Measurement Method ◽  
Measurement Accuracy ◽  
Accuracy Analysis ◽  
Error Sources ◽  
Total Station ◽  
Elevation Measurement ◽  
Measurement Efficiency

In this paper, by analyzing the limitations of the traditional trigonometric elevation method, and on the basis of establishing a mathematical model of trigonometric elevation, a convenient and fast trigonometric elevation method without instrument height and prism height is improved, and the operation steps of the method are introduced in detail. The accuracy analysis was evaluated and the method was applied to actual engineering. The results show that under the premise of ensuring the measurement accuracy, this method not only reduces the range of measurement error sources, but also improves the measurement efficiency.

Use of a no prism total station for field measurements in Pinus tabulaeformis Carr. stands in China

2012 ◽  
Vol 113 (3) ◽  
pp. 259-265 ◽  
Author(s):  
Fei Yan ◽  
Mohammad Rahmat Ullah ◽  
Yinxi Gong ◽  
Zhongke Feng ◽  
Yusuf Chowdury ◽  
...  
Keyword(s):  
Field Measurements ◽  
Pinus Tabulaeformis ◽  
Total Station ◽  
Pinus Tabulaeformis Carr

scholarly journals EXAMINATION METHOD OF THE EFFECT OF THE INCIDENCE ANGLE OF LASER BEAM ON DISTANCE MEASUREMENT ACCURACY TO SURFACES WITH DIFFERENT COLOUR AND ROUGHNESS

2016 ◽  
Vol 22 (3) ◽  
pp. 420-436 ◽  
Author(s):  
Karol Daliga ◽  
Zygmunt Kurałowicz
Keyword(s):  
Laser Beam ◽  
Measurement Method ◽  
Measurement Accuracy ◽  
Incidence Angle ◽  
Distance Measurement ◽  
Distance Measurements ◽  
Total Station ◽  
Examination Method ◽  
Critical Incidence ◽  
Reflective Foil

Interest in the influence of the incidence angle of a laser beam to distance measurements can be seen in many areas of science and technology: geodesy, glaciology, archaeology, machine automation, and others. This paper presents results of measurements of the effect of the incidence angle of a laser beam to distance measurements to the surfaces of different colour and roughness by Topcon's electro-optical total station with an accuracy of 3 mm. Measurement method and the method of elimination of test stand errors are presented. The results of measurements have been analysed and the influence of selected factors (surface colour and roughness, lack of instrument rectification) on the distance measurement have been discussed. It is also shown the critical incidence angle above which it can be impossible to measure distances to reflective foil with tested total station

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