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Search Results: 1 - 10 of 516 matches for " ?tefan Sokol "
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Some knowledge from determination of real condition of construction
tefan Sokol,Marek Bajtala
Acta Montanistica Slovaca , 2008,
Abstract: Submitted article deals with establishment of reference points in order to measure real shape of clinker silo. Detail precisionanalysis of reference and observed points measured by means of free station method is given. Also a comparison between theoreticaland by experimental measurement reached precision of reference point determination is discussed.
Estimation of variance components from the measurement in a geodetic network
Bajtala Marek,Sokoltefan
Acta Montanistica Slovaca , 2005,
Abstract: The precision of geodetic instruments used for precise measurements in geodetic networks is described by the dispersion σ2 or the standard deviation σ. Some of geodetic instruments, like electro optic range-finder and its accuracy are characteristized by the formule: .21β σ+= The estimation methods of the parameters 1 and 2 from the data acquired by geodetic measurements on the geodetic baseline. Methods and mathematical models of these parameters estimation (variance coefficients) directly from the measuring experiment in the geodetic network with the estimate of indeterminateness are presented together with the comparison of achieved results of estimates by the mentioned methods.
Analysis of trigonometrically measured elevations
Miroslav Lipták,tefan Sokol
Acta Montanistica Slovaca , 2009,
Abstract: Trigonometric height determination employing total stations has found its wider application. With a construction improvementof total stations the crucial source of systematic errors has become environment where the specific measurement is realized. Variedoptical environments properties by changes of meteorological factors effect vertical refraction which can be regarded as a variablesystematic error.In submitted article the attention is given to an existence of systematic influences by means of ANOVA tool. Subsequently,the dependence between systematic errors and changes of meteorological factors is given on the ground of correlation analysis.
Creation of a Surveying Base for an Ice Rink Reconstruction Project
tefan Sokol,Marek Bajtala,Miroslav Lipták
Acta Montanistica Slovaca , 2011,
Abstract: The contribution deals with surveying works needed for rebuilding project of O. Nepela ice rink in Bratislava. An essential partis review of the existing documentation with actual parameters of the selected elements of ice rink construction, which will serveas a base for the reconstruction project. The most important part of surveying measurement is to establish a control network, fromwhich follows measurement of the detailed points of selected elements. Next section of paper deals with a choice of a suitable typeof control network and its optimization in terms of availability and required accuracy. Finally, the contribution deals withthe measurement of the spatial elements and with a 3D model creation of the main supporting pillars, entries, stands, stairs and icehockey ground.
Possibilities of eliminating the refraction influence on the trigonometric elevation measurement
tefan Sokol,Ján Je?ko
Acta Montanistica Slovaca , 2005,
Abstract: The most of geodetic measurements are carried out in the lowest non-stable air levels over the terrain, which are very difficult and change in time with the optical environment. These air levels are approximately parallel with the earth surface, reaching the elevation of several metres, and about 99 % of all geodetic measurements are realized here. In the last years there was a great development in the area of constructional solution of measuring instruments. Modern electronic theodolites of the highest accuracy class reach the accuracy of direction (angle) measurement of 0,1 – 0,2 mgon and electronic rangefinders more than 0,5 mm for 1 – 2 km distances. That’s why the situation rise up where the important source of systematic errors in the measuring process are not instrumental errors but errors of the environment, in which is the measuring process realized. Because of this high accuracy of geodetic instruments, the refraction influence is a base limiting factor of increasing the measurement accuracy. In the past, the refraction influence was mostly neglected in the engineering geodesy but, in a present, requirements are given on a higher accuracy. That’s why various theoretical refraction models and practical inspecting processes are used, which enable us to decrease the refraction influence on the measured values.
Photogrammetric determination of the spatial shape of the clinker silo
Marek Fra?tia,Marek Bajtala,tefan Sokol
Acta Montanistica Slovaca , 2007,
Abstract: Digital photogrammetry, in comparison with analogue or analytical, streamlines whole process of determination of a spatial point position, whether time reduction or increasing of accuracy. In this sense, a amateur digital cameras can be used for purposes of accurate measurement of objects by the method of stereophotogrammetry or convergent photography. The paper is aimed at using of the close-range photogrammetry for a spatial shape determination of the steel coating of the clinker silo and at a comparison of the photogrammetric and geodetic results.
Geodetic methods of 3D data collection
tefan Sokol,Ján Je?ko,Marek Bajtala
Acta Montanistica Slovaca , 2007,
Abstract: The term Geographic Information System (GIS) was used in 1963 for the first time in establishing of spatial oriented Information system supported by computer in Canada. With this term it was for the first time pointed on the automatized acquisition of spatial information and their consecutive processing using computer technologies. GIS is computer supported system, which consists of hardware, software and enables editing, storage, organisation of modelling and analysis of spatial oriented data, as well as their textual, numerical and graphical presentation. The most important part of GIS are spatial data of spatial region the system works with. Because of that the analogue or digital object acquisition of data is the most decisive base for successful functioning of information model with functional data structure.Brief information about methods of spatial data acquisition and their exploitation for geo-information spatial model is the aim of the proper.
Estimation of network parameters with consideration of the horizontal refraction influence
Marek Bajtala,tefan Sokol,Ján Je?ko
Acta Montanistica Slovaca , 2007,
Abstract: The proposed paper is focused on reviewing the horizontal refraction during measurement in local geodetic networks. Based on elaborated theoretical assumptions the refraction model was arranged in a way that the questions were solved by the identity of the horizontal refraction. The necessary part of the application of the refraction model is the problem of optimizing the geodetic networks and deducting the method of the variance components, which play a major role in the precision of results. The independent acquisition of the thesis lies in the area of modeling the horizontal refraction with a stochastic approach, where the values of the refraction are gained through the measured data of the horizontal direction. In the model, it is necessary to identify the parameters according to the entire measurements and between two points. According to the attained results, I can state that the horizontal refraction was identified mainly on the measurements that were confirmed near the dam in most of the measured experiments. The experimented measurements were confirmed based on the assumptions that are in theoretical capitol, where the assumptions of the effect of the horizontal refraction are measured near the dam, river, shores, and valleys.
Testing and calibration of geodetic instruments
Ján Je?ko,tefan Sokol,Marek Bajtala
Acta Montanistica Slovaca , 2007,
Abstract: The problem of testing, verification and calibration of length-scales (electronic rangefinders) and angle-scales (geodetic instruments). The calibration of coded levelling rods and the systemic calibration of digital levelling instruments. The calibration on linear comparative baseline in a terrain – the elaboration of measured data. The testing of universal measuring instruments in laboratory conditions - specific problems in testing of instruments with the passive reflection. Some knowledge about the calibration of horizontal circles of angle-measuring geodetic instruments.
Use of Dorsal Metacarpal Artery Flaps in Post Burn Reconstruction - Two Cases Report
Sokol Isaraj
Macedonian Journal of Medical Sciences , 2011, DOI: 10.3889/MJMS.1857-5773.2011.0164
Abstract: Perforator flaps based on the dorsal metacarpal arteries, islanded on a reverse flow pattern are used for reconstruction of two patients respectively with an unstable scar located on the MCP joints and a severe contracture of the ring finger, with full survival and excellent long term results.
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