Reference Ellipsoid and the Geodetic Coordinate System

Geodesy ◽  
2014 ◽  
pp. 165-263
Author(s):  
Zhiping Lu ◽  
Yunying Qu ◽  
Shubo Qiao
Keyword(s):  
Coordinate System ◽  
Reference Ellipsoid ◽  
Geodetic Coordinate System

scholarly journals Updating of digital topographic maps in the new national spatial coordinate system: case Fergana valley in Uzbekistan

2021 ◽  
Vol 4 ◽  
pp. 1-5
Author(s):  
Dilbarkhon Fazilova ◽  
Hasan Magdiev
Keyword(s):  
Coordinate System ◽  
Spatial Data ◽  
Information Technologies ◽  
Satellite System ◽  
Topographic Maps ◽  
The North ◽  
New Information ◽  
Global Navigation Satellite ◽  
Geodetic Coordinate System ◽  
Geocentric Coordinate System

Abstract. The classical geodetic coordinate system (CS42) in Uzbekistan uses the Krasovsky ellipsoid. The implementation of new information technologies, such as the Global Navigation Satellite System, became the basis for the development of a new national open geocentric coordinate system. This paper describes the development of a distortion grid for transforming horizontal spatial data from the local geodetic datum CS42 to a geocentric datum WGS84 for 1:100000 scale maps of the Fergana Valley in Uzbekistan. A first version of the distortion grid file has been created for transforming between CS42 and WGS84 for the whole territory of the country. The significant influence of the longitudinal drift of the region has been confirmed. The grid was used to transform topographic maps at a scale of 1:100000 for the Fergana Valley. Changing the map datum has shifted the grid of coordinate systems by 70 m in the East and 7 m in the North.

Chinese Geodetic Coordinate System 2000 and its Comparison with WGS84

2014 ◽  
Vol 580-583 ◽  
pp. 2793-2796 ◽  
Author(s):  
Hou Pu Li ◽  
Shao Feng Bian ◽  
Zhong Mei Li
Keyword(s):  
Coordinate System ◽  
Normal Gravity ◽  
Three Dimensional ◽  
Vertical Gradient ◽  
Coordinate Systems ◽  
Present Measurement ◽  
Three Dimensional Coordinate ◽  
Geodetic Coordinate System ◽  
International Measurement ◽  
Geocentric Coordinate System

It is a general trend to adopt the geocentric coordinate system as a geodetic datum for the international measurement community. The definition and realization of Chinese geocentric three-dimensional coordinate system (CGCS2000) which has been employed since July 1st, 2008 were introduced in detail. The defining parameters and derived constants of the reference ellipsoid used were given. The comparison between CGCS2000 and WGS84 was carried out. The differences of geodetic coordinates of a point between the two coordinate systems, normal gravity and vertical gradient of normal gravity on the two ellipsoids caused by the change of the flattening of the ellipsoid were analyzed. The results show that these differences could be neglected in view of present measurement accuracies.

Rapid Mapping Method Based on Free Blocks of Surveys

2016 ◽  
Vol 10 (2) ◽  
Author(s):  
Xianwen Yu ◽  
Huiqing Wang ◽  
Jinling Wang
Keyword(s):  
Coordinate System ◽  
Large Scale ◽  
Implementation Process ◽  
Mapping Method ◽  
New Method ◽  
Control Points ◽  
Coordinate Systems ◽  
Free Block ◽  
Transformation Parameters ◽  
Geodetic Coordinate System

AbstractWhile producing large-scale larger than 1:2000 maps in cities or towns, the obstruction from buildings leads to difficult and heavy tasks of measuring mapping control points. In order to avoid measuring the mapping control points and shorten the time of fieldwork, in this paper, a quick mapping method is proposed. This method adjusts many free blocks of surveys together, and transforms the points from all free blocks of surveys into the same coordinate system. The entire surveying area is divided into many free blocks, and connection points are set on the boundaries between free blocks. An independent coordinate system of every free block is established via completely free station technology, and the coordinates of the connection points, detail points and control points in every free block in the corresponding independent coordinate systems are obtained based on poly-directional open traverses. Error equations are established based on connection points, which are determined together to obtain the transformation parameters. All points are transformed from the independent coordinate systems to a transitional coordinate system via the transformation parameters. Several control points are then measured by GPS in a geodetic coordinate system. All the points can then be transformed from the transitional coordinate system to the geodetic coordinate system. In this paper, the implementation process and mathematical formulas of the new method are presented in detail, and the formula to estimate the precision of surveys is given. An example has demonstrated that the precision of using the new method could meet large-scale mapping needs.

scholarly journals Conversion of 3-Component Magnetic Data into Geodetic Coordinate System by Using Clinometer and GNSS Compass

2013 ◽  
Vol 16 (2) ◽  
pp. 91-96
Author(s):  
Tae-Hwan Jeon ◽  
Hyoungrea Rim ◽  
Young-Sue Park ◽  
Muteak Lim ◽  
Young-Hong Shin
Keyword(s):  
Coordinate System ◽  
Magnetic Data ◽  
Geodetic Coordinate System

Geocentric Coordinate Systems and Actual Problems of Modernization of the State Geodetic Network

2018 ◽  
Vol 931 ◽  
pp. 687-691
Author(s):  
Anastasia E. Dudnik ◽  
Oksana V. Germak ◽  
Maksim G. Govorukhin ◽  
Galina K. Tupoleva
Keyword(s):  
Coordinate System ◽  
Russian Federation ◽  
Geodetic Network ◽  
The State ◽  
Coordinate Systems ◽  
The Russian Federation ◽  
Geodetic Coordinate System ◽  
Geocentric Coordinate System

The article describes the state of the geocentric coordinate system of the Russian Federation. Current problems of the geodetic coordinate system are described, and a method for solving this problem is proposed.

Combined Positioning Device for the Control System of the Microtunnel Boring Machine

2021 ◽  
Vol 64 (2) ◽  
pp. 65-70
Author(s):  
Alexander Batyukov ◽  
Keyword(s):  
Control System ◽  
Coordinate System ◽  
Local Coordinate System ◽  
Spatial Position ◽  
Positioning Device ◽  
Machine Control ◽  
Geodetic Coordinate System ◽  
Tunneling Shield

The issues of developing a combined positioning device for the microtunnel boring machine control system are considered. A device combining laser and inertial methods of determining coordinates is proposed, which provides the possibility of determining the coordinates and spatial position of the tunneling shield during the construction of straight and curved tunnels by the pushing method. A method for connecting the positioning device with the microtunnel boring machine control system based on the RS-485 wired interface is proposed. A method for calculating coordinates has been developed that takes into account the rotation of the local coordinate system relative to the local geodetic coordinate system.

Merging of the Canadian Triangulation Network with the 1973 Doppler Satellite Data

1974 ◽  
Vol 28 (5) ◽  
pp. 487-495 ◽  
Author(s):  
A. E. Peterson
Keyword(s):  
Coordinate System ◽  
Satellite Data ◽  
Orthogonal System ◽  
Preliminary Results ◽  
Triangulation Network ◽  
Two Systems ◽  
Systems Transformation ◽  
Geodetic Coordinate System

Coordinate estimates resulting from an adjustment of Canadian triangulation were adjusted simultaneously with 1973 reduced Doppler satellite data to investigate differences in scale and rotation between the two systems. Transformation and adjustment involving the geodetic coordinate system and earth centered orthogonal system are discussed and preliminary results of merging the two systems are summarized.

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