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Date submitted2022-06-25
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Date accepted2023-06-20
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Date published2024-02-29
Determination of the accuracy of leveling route based on GNSS/leveling and Earth gravitational model data SGG-UGM-2 at some typical regions in Vietnam
- Authors:
- Bui Thi Hong Tham
- Phi Truong Thanh
This paper presents the accuracy of leveling routes determined by using GNSS/leveling at three grades and Earth gravitational model data SGG-UGM-2 in four regions of Vietnam by calculating the difference between the measured height anomalies and the model of pairs of points. The calculation is made based on the total points of three grades for four regions (99 in the Northwest, 34 in the Red River Delta, 130 in the Central Highlands, and 96 in the Mekong River Delta) with the leveling routes, connected between pair of points in each region are 189, 92, 294, and 203. The calculated results of the percentage of accuracy of the leveling routes of the four regions have shown that most of the leveling routes are satisfactory (grades I-IV, and technical leveling). The determination of the accuracy of the leveling route is completely applicable to other areas when the points have simultaneous ellipsoid and leveling heights and it also helps managers and surveyors to predict the accuracy of the height points when the above-mentioned leveling routes are connected and to take reasonable measures when implementing the project.
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Date submitted2009-07-27
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Date accepted2009-09-30
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Date published2010-04-22
Results of repeated geodetic observations аt the Мukhanovsk technogenic geodynamic polygon
Results of repeated leveling observations on the geodynamic range, organised on the Muhanovsky oil field (Samara region) are presented. It is shown that the most abnormal vertical displacement of a terrestrial surface (120 mm) are dated to fault to a zone located in the western part of the field and represent an essential danger to objects of the infrastructure of an oil field. Vertical displacement along the profile crossing Otradny town, located at oil field, are insignificant and it makes value of 2 to3 mm.
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Date submitted2009-07-11
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Date accepted2009-09-25
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Date published2010-04-22
Control of deformations of buildings and constructions at the built-up territories within mining diversions of oil and gas fields under conditions of Far North
Results of monitoring of buildings’ deformations in Noviy Urengoi town (situated inside the lease of giant oil and gas Urengoi field) are presented. Monitoring consists of multi-pass satellite radar imaging, GPS-measurements and repeated geometric leveling.
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Date submitted1950-07-17
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Date accepted1950-09-03
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Date published1951-04-30
On the asymptotic representation of average distances in a random point set on the plane
- Authors:
- M. L. Verzhbinskii
- R. E. Soloveichik
In this paper, we give a solution to a general problem in geometric probability theory, which is the subject of a number of issues in modern technology (aviation agricultural technology, visibility in turbid environments, etc.). Let us consider a set A of points A₀, A..., An, randomly distributed in a circle K of radius R. We assume that the occurrence of each individual point of this set in parts of the circle K equal in area is equally probable (the law of equal probability). Let, further, the number of points in the set A be related to the value of the radius R such that the limit of the ratio exists and is finite. In other words, the average concentration of points in the circle K, with n and R increasing without limit, tends to a finite limiting concentration. We will study the random variable r, which is the smallest of the distances of an arbitrary point A₀ of set A, with its random position in the circle K, to the other points of set A. The random variable under consideration will obviously be equal to the radius of a circle with its center at point A₀, which does not contain other points of set A and has at least one point of this set on its boundary.