scholarly journals A Study on Continuous Management Strategy or Published Coordinates of National Geodetic Control Points using GPS Network Adjustment

2011 ◽  
Vol 29 (4) ◽  
pp. 367-380 ◽  
Author(s):  
Kwang-Ho Jung ◽  
Hung-Kyu Lee
Keyword(s):  
Management Strategy ◽  
Control Points ◽  
Network Adjustment ◽  
Gps Network ◽  
Geodetic Control

scholarly journals Design and Geodetic Adjustment of Levelling Network for Establishment of Unified Control Points in Korea

2021 ◽  
pp. 29-40
Author(s):  
H.K Lee ◽  
S.H. Yun ◽  
J.H. Kwon ◽  
J.S. Lee
Keyword(s):  
Pilot Study ◽  
Vertical Component ◽  
Reference Points ◽  
Spatial Density ◽  
Control Points ◽  
Network Adjustment ◽  
Technical Challenge ◽  
Adjustment Procedure ◽  
Geodetic Control ◽  
Horizontal Network

The unified control points (UCPs), the multi-dimensional geodetic reference points installed in the low elevated area, has been established in Korea for the combination of the horizontal and the vertical geodetic control. While the 1st-phase UCPs network was completed in 2011 with a spatial density of about 10km, its densification has been underway as the 2nd-phase project. The UCPs supersedes the legacy geodetic points, such as triangulation points and benchmarks (BMs) once the 2nd-phase implementation. Although the horizontal network of the UPCs can be readily realised by GNSS technology, a technical challenge of the vertical component remains to be settled due to characteristics of the geodetic levelling technique. To this end, a pilot study was conducted to design a new version of the UCPs-based levelling network and to demonstrate its effectiveness with a comparison of the legacy. In this paper, a concept of the UCPs-based levelling network is briefly addressed with some prominent examples, and details of a pilot network and its measurements is given with the network adjustment procedure. Finally, results of the adjustments are provided with an emphasis on the influence of the newly designed network in terms of accuracy, reliability and estimated heights.

scholarly journals A LIBRATION MODEL FOR ENCELADUS BASED ON GEODETIC CONTROL POINT NETWORK ANALYSIS

2016 ◽  
Vol XLI-B4 ◽  
pp. 459-462 ◽  
Author(s):  
I. E. Nadezhdina ◽  
A. E. Zubarev ◽  
E. S. Brusnikin ◽  
J. Oberst
Keyword(s):  
Network Analysis ◽  
Coordinate System ◽  
Control Point ◽  
Image Data ◽  
Control Points ◽  
Global Control ◽  
Cartesian Coordinates ◽  
Voyager 2 ◽  
Librational Motion ◽  
Geodetic Control

A new global control point network was derived for Enceladus, based on Cassini and Voyager-2 image data. Cassini images were taken from 2005 to 2014, for Voyager we have only one flyby in the middle of 1981. We have derived 3D Cartesian coordinates for 1128 control points as well as improved pointing data for 12 Voyager and 193 Cassini images in the Enceladus-fixed coordinate system. The point accuracies vary from 55 m to 2900 m (average point accuracy – 221 m). From tracking of the control points we detect a librational motion described by a model which includes 3 different periods and amplitudes (Rambaux et al., 2011). We determine the amplitudes for each term. Our new control point network has a higher number of point measurements and a higher accuracy than previous data (Giese et al., 2014).

scholarly journals GIScience Theory Based Assessment of Spatial Disparity of Geodetic Control Points Location

2020 ◽  
Vol 9 (3) ◽  
pp. 148
Author(s):  
Elzbieta Bielecka ◽  
Krzysztof Pokonieczny ◽  
Sylwia Borkowska
Keyword(s):  
Nearest Neighbor ◽  
Geodetic Network ◽  
Control Points ◽  
Outlier Analysis ◽  
Geodetic Networks ◽  
Land Administration ◽  
Ex Post ◽  
Spatial Cluster Analysis ◽  
Geodetic Control ◽  
Application Fields

Geodetic networks provide a spatial reference framework for the positioning of any geographical feature in a common and consistent way. An even spatial distribution of geodetic control points assures good quality for subordinate surveys in mapping, cadaster, engineering activities, and many other land administration-oriented applications. We investigate the spatial pattern of geodetic control points based on GIScience theory, especially Tobler’s Laws in Geography. The study makes contributions in both the research and application fields. By utilizing Average Nearest Neighbor, multi-distance spatial cluster analysis, and cluster and outlier analysis, it introduces the comprehensive methodology for ex post analysis of geodetic control points’ spatial patterns as well as the quantification of geodetic networks’ uniformity to regularly dense and regularly thinned. Moreover, it serves as a methodological resource and reference for the Head Office of Geodesy and Cartography, not only the maintenance, but also the further densification or modernization the geodetic network in Poland. Furthermore, the results give surveyors the ability to quickly assess the availability of geodetic points, as well as identify environmental obstacles that may hamper measurements. The results show that the base geodetic control points are evenly dispersed (one point over 50 sq. km), however they tend to cluster slightly in urbanized areas and forests (1.3 and 1.4 points per sq. km, respectively).

Analysis of Geodetic Control Points Density Depending on the Land Cover and Relief – the Opoczno District Case Study

2017 ◽  
Author(s):  
Krzysztof Pokonieczny ◽  
Elzbieta Bielecka ◽  
Paweł Kaminski
Keyword(s):  
Land Use ◽  
Land Cover ◽  
Rural Areas ◽  
Pearson Correlation ◽  
Coefficient Of Determination ◽  
Control Points ◽  
Global Index ◽  
Clustering Methods ◽  
Geodetic Control

The main goal of this study is an analysis of statistical and spatial relationships between land cover, relief and geodetic control points’ location. We aimed at proving the previous results showing that in rural areas the density of horizontal geodetic points depends at least 50% on the land cover. Moreover, two clustering methods, k-means and Kohonen self-organising maps, were used to group surveying districts according to similarity in land use, relief and geodetic control density. The research methods includes statistical methods, ie. Pearson correlation and coefficient of determination computed by Pawlowski method as well as spatial autocorrelation expressed by Moran I global index. The results show that both clustering methods give very similar results, however for the k-means the surveying districts are more spatially clustered, than for Kohonen. The coefficient of determination R2 equals 0.652, what means that geodetic control points density in 65.2% explains by the percentage of built-up areas, forests and the standard deviation of elevation. The analysis was conducted for the 3rd order geodetic control points, for Opoczno district, located in the central part of Poland.

scholarly journals Densification of (GNSS) Control Points for Cadastral and Mapping Purposes

2017 ◽  
Vol 1 (2) ◽  
pp. 287-298 ◽  
Author(s):  
M. O. Ehigiator ◽  
S. O. Oladosu ◽  
R. Ehigiator-Irughe
Keyword(s):  
Data Analysis ◽  
Real Time ◽  
Control Points ◽  
Network Adjustment ◽  
Static Mode ◽  
Continuous Exercise ◽  
Master Station

GNSS control densification is a continuous exercise in the field of Geomatics. This form the basis upon which other Geomatics and Engineering activities geared toward development are referenced. This paper employed the use of Hi-Target GPS to extend and establish controls at the confines of the study area in static mode while topographical survey was carried out using real-time kinematics method. Network adjustment, for the newly established control stations were carried out while the master station was held fixed. Data analysis and production of plans were done using softwares like Hi-Target V30, Carlson Civil Suite 2017 etc. The result of perimeter computation for the study area gave a total of 93.614 hectare

scholarly journals DIRECTIONS OF LINE CONSTRAINTS DILEMMA IN PARAMETRIC LINEAR REGRESSION

2021 ◽  
Vol 56 (5) ◽  
pp. 552-562
Author(s):  
Mohd Azwan Abbas ◽  
Norshahrizan Mohd Hashim ◽  
Mohamad Faiz Mohd Zaim ◽  
Muhammad Husaini Ya’cob ◽  
Ahmad Azmi Hashim ◽  
...  
Keyword(s):  
Linear Regression ◽  
Satellite System ◽  
Control Points ◽  
Process Data ◽  
Network Adjustment ◽  
Positional Accuracy ◽  
Rigorous Approach ◽  
Adjustment Procedure ◽  
Global Navigation Satellite

The demand for positional accuracy and multi-dimensional data have demonstrated drastic changes in the geomatics data adjustment approach. Furthermore, the capability of modern sensors to provide high accuracy data (i.e., global navigation satellite system) has caused the crucial requirement for a rigorous adjustment that can process data from multi-sensors. Geomatics practitioners have gradually transformed the adjustment procedure to the most rigorous approach (i.e., parametric linear regression) to adapt to current demand. However, legacy datasets that utilize independent line constraint in the traditional adjustment approach have caused significant uncertainties in parametric linear regression (LR) adjustment. To resolve this dilemma, this research has designed robust experiments using closed traverse types: single-line constraint, multi-line constraints, and sub-network line constraint. Through errors trend and network form deterioration analyses, the outcomes have visually and numerically verified the insignificant of independent line constraints in parametric LR. However, the establishment of control points at the beginning or end of lines could solve the limitation of the abovementioned issue. In both analyses, control points at initial lines have demonstrated the best solution for constrained adjustment. The obtained results have exemplified the appropriate implementation of network adjustment in the presence of line constraints. As positional accuracy becomes the main priority, it can be concluded that points-based constraints are more advisable in preserving the quality of cadastral network adjustment.

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