scholarly journals Accuracy standards of tying the horizontal and vertical control network to the National Geodetic Control Network.

2014 ◽  
Vol 8 (3) ◽  
pp. 41
Author(s):  
Janusz Dąbrowski
Keyword(s):  
Control Network ◽  
Vertical Control ◽  
Geodetic Control

Establishment of geodetic control network for Quy Nhon University area

2021 ◽  
Vol 15 (1) ◽  
pp. 61-73
Author(s):  
Quang Hien Truong ◽  
◽  
Anh Tu Ngo ◽  
Thi Hien Cu ◽  
◽  
...  
Keyword(s):  
Natural Resources ◽  
Research Result ◽  
Bench Mark ◽  
Control Network ◽  
Total Station ◽  
Network Diagram ◽  
Specialized Software ◽  
General Plan ◽  
Geodetic Control ◽  
The University

Geodetic control network of Quy Nhon University (QNU) is established based on GNSS technology and electronic total station technology in combination with the middle geometrical elevation surveying method, bench mark of network built with firm concrete installed with a centralized insulator cap. The network consists of 11 points, of which 2 points are traversed from the cadastral point of class I, used as the starting points for the traverse. The network is built based on total station method with 2 turns of forward and backward surveying. The network’s leveling height is measured by the middle geometrical elevation surveying method, ensuring compliance with the procedures and rules of the Ministry of Natural Resources and Environment. The research result includes a system of stable and solid network points, together with the coordinates and the leveling height that are closely adjusted by specialized software, control network diagram. Geodetic control network of the QNU is important in setting up map, general plan, planning, construction and serving for teaching and scientific research of the university.

GEODETIC CONTROL SURVEYING, ESPECIALLY WITH THE GEODIMETER AGA NASM 4, AT THE SWEDISH CADASTRAL AND LAND SURVEY ORGANIZATION

1963 ◽  
Vol 17 (4) ◽  
pp. 362-366
Author(s):  
Sven G. Möller
Keyword(s):  
First Order ◽  
Vertical Control ◽  
Land Survey ◽  
Geodetic Control

The early control surveys on which Swedish cadastre was based are being replaced by more modern systems. A first-order triangulation net, local nets, vertical control, surveying methods and results obtained by Swedish cadastral and land survey organizations are briefly discussed.

scholarly journals Extraction of the deterministic ingredient of a dynamic geodetic control network

2012 ◽  
Vol 2 (1) ◽  
pp. 68-75 ◽  
Author(s):  
L. Shahar ◽  
G. Even-Tzur
Keyword(s):  
Kinematic Model ◽  
Simultaneous Estimation ◽  
Physical Parameters ◽  
Control Network ◽  
Deformation Parameters ◽  
Free Network ◽  
Geodetic Control ◽  
Definition Of ◽  
Minimum Constraints ◽  
Entire Network

Extraction of the deterministic ingredient of a dynamic geodetic control networkA minimum constraints solution, which resolves the datum defect of a control network, is an arbitrary solution that may result in a systematic error in the estimation of the deformation parameters. This error is not derived from measurements and is usually inconsistent with the geophysical reality. A free network is affected only by errors of measurement and, therefore, a free network is an accepted way of coping with this problem. Study of deformations, which is based on the use of geodetic measurements, is usually performed today by defining a kinematic model. Such a model, when used to describe a complex geophysical environment, can lead to the partial estimation of the deterministic dynamics, which characterize the entire network. These dynamics are themselves expressed in measurements, as the adjustment systems' residuals. The current paper presents an extension of the definition of the parameters that are revalued. This extension enables the cleaning of measurements by means of the extraction of datum elements that have been defined by geodetic measurement. This cleaning minimizes the effects of these elements on the revaluated deformation. The proposed algorithm may be applied to achieve the simultaneous estimation of the physical parameters that define the geophysical activity in the network.

scholarly journals A New Method for Vertical Deformation Detection Using Survey Control Networks

2009 ◽  
Vol 4 (1) ◽  
pp. 14
Author(s):  
Mudathir Omer Ahmed
Keyword(s):  
Least Squares ◽  
Confidence Level ◽  
Specific Area ◽  
New Method ◽  
Control Network ◽  
Vertical Deformation ◽  
Control Networks ◽  
Vertical Control ◽  
Vertical Deformations ◽  
Step Localization

Usually, the Survey control networks are used for deformation detection in a specific area using observations taken at different epochs. Where the coordinates obtained from two epochs, using least squares technique, are compared in order to assess if a deformation of a specified magnitude exists. Traditionally, the global congruency test is carried out so as to detect if the area of the network has undergone any movement (uplift or subsidence) due to natural or manmade causes. As a next step, localization methods are used to determine deformations at specific points in case there are changes in shape. In this research a new method is developed to establish deformations at specific points directly. The method is tested using a vertical control network simulated at various epochs of observation. The results obtained are compared with those obtained by another used method. Results obtained using this method indicate that vertical deformations greater than 0.03m using a precision of observation less than 10 can be detected at a minimum significant level of 0.05 (95% confidence level).

scholarly journals GPS Satellite Interference in Hungary

2001 ◽  
Vol 196 ◽  
pp. 319-323
Author(s):  
T. Borza ◽  
I. Fejes
Keyword(s):  
Radio Frequency ◽  
Global Positioning System ◽  
Digital Data ◽  
Signal Frequency ◽  
Control Network ◽  
Radio Frequency Interference ◽  
Positioning System ◽  
Gps Measurements ◽  
Global Positioning ◽  
Geodetic Control

Civil users of the NAVSTAR Global Positioning System (GPS) in Hungary occasionally experience interference at the 1575.42-MHz GPS signal frequency. As the application of the GPS technique spreads rapidly in our country, radio frequency interference (RFI) should be considered a serious threat. The new geodetic control network (OG-PSH) in Hungary is based on GPS measurements and incorporates more than 1100 sites. The paper reports the experiences gained during the establishment of the network. Interference sources were tracked to ground-based digital data transmissions for telecommunications, which operate mostly in the Western part of Hungary. Telecommunication regulations exceptionally allow such transmissions in specified countries. In order to warn potential GPS users, the interference sources are being mapped.

The rotation period, direction of the North Pole, and geodetic control network of Venus

1992 ◽  
Vol 97 (E8) ◽  
pp. 13141 ◽  
Author(s):  
M. E. Davies ◽  
T. R. Colvin ◽  
P. G. Rogers ◽  
P. W. Chodas ◽  
W. L. Sjogren ◽  
...  
Keyword(s):  
Rotation Period ◽  
North Pole ◽  
Control Network ◽  
The North ◽  
Geodetic Control

Establishment of High Precision Horizontal and Vertical Control Network in Zoucheng City

2013 ◽  
Vol 864-867 ◽  
pp. 2787-2791
Author(s):  
De Bao Wang ◽  
Yong Xiang Liu ◽  
Wen Jing Yang
Keyword(s):  
Fourth Order ◽  
Function Method ◽  
Three Dimensional ◽  
Geodetic Network ◽  
Control Network ◽  
Control Points ◽  
Two Dimensional ◽  
Level Control ◽  
Vertical Control ◽  
Free Network

The paper uses D level, E level and the level of GPS control network establishment satellite space geodetic network in Zoucheng city, through the baseline calculating, classic adjustment of free network, three-dimensional unconstrained adjustment and two-dimensional constraint adjustment to get the WGS-84 three dimensional coordinates and 1980 xi 'an horizontal coordinates of control points; then using the fourth-order levelling connection survey all D-level and part E-level control points to build vertical control network, for the remaining GPS control points we utilize quadric function method using GPS elevation fitting given its elevation seek to obtain three-dimensional coordinates of all the basic control points.

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