Determination of a local geodetic network by multi-arc processing of satellite laser ranges

2005 ◽  
pp. 417-445 ◽  
Author(s):  
A. Milani ◽  
E. Melchioni
Keyword(s):  
Geodetic Network

Geodetic Coordinates in Four Dimensions

1974 ◽  
Vol 28 (5) ◽  
pp. 574-581 ◽  
Author(s):  
R. S. Mather
Keyword(s):  
Geodetic Network ◽  
Cost Benefit ◽  
Short Term ◽  
Measuring Systems ◽  
Four Dimensions ◽  
Geodetic Coordinates ◽  
The Earth ◽  
Time Variations ◽  
System Requirements

An attempt is made to summarize arguments for defining geodetic coordinates in the four-dimensional sense, in a manner that will permit their use without undue complexity over extended periods of time for geophysical and geodynamic purposes. Such arguments cannot be isolated from the consideration of techniques for position determination with the highest possible precision for other purposes that are potentially beneficial for the global community, in view of the capital expense involved. The types of observations that offer the most promise in the achievement of these goals are also a factor in the development. A simple system of reference that fulfills the basic requirements of geodetic determinations of this type is described in the context of inter-relations between the geometric and dynamic characteristics of the earth. System requirements for the implementation of such a scheme are outlined. There is disagreement on whether geodesy can contribute any data of significance in the short term, apart from that for studies of gross effects in local regions, toward understanding earthquake mechanisms. However, the overall cost-benefit-oriented geodetic requirements, calling for determinations of the highest precision, appear to warrant the maintenance of a worldwide geodetic network and associated measuring systems in a manner that would also permit the determination of those time variations in geodetic coordinates with global relevance. A historical perspective makes it mandatory that such a scheme be initiated in the next decade, in view of the favorable portents for a significant improvement in the measuring precision.

Accuracy and reliability of gyro measurements at today’s tunnelling projects

2018 ◽  
Vol 12 (1) ◽  
pp. 95-107 ◽  
Author(s):  
Otto Heunecke ◽  
Wolfgang Liebl
Keyword(s):  
Measurement Uncertainty ◽  
Geodetic Network ◽  
Measuring Method ◽  
Reference Line ◽  
Orientation Control ◽  
Reliable Assessment ◽  
Standard Deviations ◽  
Control Of Networks

Abstract Gyro theodolites – briefly gyros – allow the orientation transfer from a reference line to another line without need for a connecting geodetic network. They are routinely used for orientation control of networks in tunnelling projects. This is currently the only way to stabilize accuracy and reliability in tunnelling networks and is indispensable with respect of today’s requirements for excavation and breakthrough accuracy. In order to archive a reliable assessment of correctness, the measuring method has to be planned in a way that systematic influences in the determination of an underground directional angle are minimized. For this purpose, the principle of differential measurements is used for an azimuth determination both in terms of time as well as in space. All required corrections and reductions must be considered correctly to obtain the directional angle of interest with a measurement uncertainty less than 1 mgon ($\stackrel{\wedge }{=}3.{3^{\prime\prime }}$). Some accuracy considerations obtained from own experiences are discussed to state whether the specified standard deviations of the used gyros according to DIN 18723-7 can be confirmed.

scholarly journals Methodology of Analysing Geodetic Network as Basis for Developing Mobile Application for Its Ongoing Update

2021 ◽  
Author(s):  
Anna Przewięźlikowska ◽  
Wioletta Ślusarczyk ◽  
Klaudia Wójcik
Keyword(s):  
Detailed Analysis ◽  
Mobile Application ◽  
Geodetic Network ◽  
Research Paper ◽  
Control Network ◽  
Control Points ◽  
Vertical Control ◽  
Set Of Points ◽  
The Relationship

Abstract The final result of surveys largely depends on the accuracy and timeliness of the control network. This research paper presents the relationship between the condition of the points and the area where they are located. The main goal of this study is to present the methodology of a detailed analysis of the database of vertical control points in a selected area that is used to develop a mobile application intended for the update of the existing set of points of the vertical control network on an ongoing basis. In order to prepare the mobile application for the ongoing update of the control network, it is necessary to define detailed procedures for dealing with the database of points. These procedures concern the determination of the methodology of making an inventory of the existing database, and then the determination of the rules for updating the control network using the developed application.

Coordinate binding of images for designing phototrangulation

2021 ◽  
Vol 972 (6) ◽  
pp. 47-54
Author(s):  
V.A. Pantushin ◽  
A.A. Andreev
Keyword(s):  
Geodetic Network ◽  
Topographic Maps ◽  
Technical Design ◽  
Design Procedures ◽  
Digital Maps ◽  
Areal Coverage ◽  
Subsequent Determination ◽  
Corner Points ◽  
Good For

The technology of the schemes development automation for areal coverage with aerial and space photography materials is proposed. Within its framework, a method for automatic coordinate referencing of images on the Earth’s ellipsoid surface with the subsequent determination of nomenclature sheets of topographic maps on a composite table was substantiated and implemented. The proposed method is based on the algorithms for calculating the azimuths and lengths of lines connecting the projections of the photographing points (inverse geodetic problem) and the coordinates of the images corner points’ projections (direct geodetic problem). The formulas for solving the geodetic tasks of the images coordinate referencing over long distances are obtained as a result of transforming and integrating the equations of geodetic lines described by the Claireau equation though F. Bessel’s method. It can be used when planning and performing aerial and space surveys, as well as to determine the cartographic base in order to select the starting points for photogrammetric condensation of the geodetic network. The technology is focused on the automation of phototriangulation technical design procedures and is good for linking images to the corresponding sections of electronic and digital maps.

scholarly journals The Use of National CORS Networks for Determining Temporal Mass Variations within the Earth’s System and for Improving GRACE/GRACE-FO Solutions

2020 ◽  
Vol 12 (20) ◽  
pp. 3359
Author(s):  
Walyeldeen Godah ◽  
Jagat Dwipendra Ray ◽  
Malgorzata Szelachowska ◽  
Jan Krynski
Keyword(s):  
Geodetic Network ◽  
Satellite System ◽  
Temporal Variations ◽  
Global Scale ◽  
Satellite Mission ◽  
Equivalent Water Thickness ◽  
Grace Satellite ◽  
Gnss Data ◽  
Earth’S System

Temporal mass variations within the Earth’s system can be detected on a regional/global scale using GRACE (Gravity Recovery and Climate Experiment) and GRACE Follow-On (GRACE-FO) satellite missions’ data, while GNSS (Global Navigation Satellite System) data can be used to detect those variations on a local scale. The aim of this study is to investigate the usefulness of national GNSS CORS (Continuously Operating Reference Stations) networks for the determination of those temporal mass variations and for improving GRACE/GRACE-FO solutions. The area of Poland was chosen as a study area. Temporal variations of equivalent water thickness ΔEWT and vertical deformations of the Earth’s surface Δh were determined at the sites of the ASG-EUPOS (Active Geodetic Network of the European Position Determination System) CORS network using GRACE/GRACE-FO-based GGMs and GNSS data. Moreover, combined solutions of ΔEWT were developed by combining ΔEWT obtained from GNSS data with the corresponding ones determined from GRACE satellite mission data. Strong correlations (correlation coefficients ranging from 0.6 to 0.9) between detrended Δh determined from GRACE/GRACE-FO satellite mission data and the corresponding ones from GNSS data were observed at 93% of the GNSS stations investigated. Furthermore, for the determination of temporal mass variations, GNSS data from CORS network stations provide valuable information complementary to GRACE satellite mission data.

scholarly journals Determination of Point Displacements in the Geodetic Network

2006 ◽  
Vol 132 (2) ◽  
pp. 58-63 ◽  
Author(s):  
Simona Savšek-Safić ◽  
Tomaž Ambrožič ◽  
Bojan Stopar ◽  
Goran Turk
Keyword(s):  
Geodetic Network
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