Current Status of Vertical Control Network in Peninsular Malaysia and Plans for Adjustment

2002 ◽  
pp. 38-43
Author(s):  
M. Azhari ◽  
S. Shahrum ◽  
K. Majid
Keyword(s):  
Peninsular Malaysia ◽  
Current Status ◽  
Control Network ◽  
Vertical Control

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).

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.

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.

The Establishment of D, E Grade GPS Control Network and Fourth-Order Leveling Network in Laicheng Industrial Zone of Laiwu City

2013 ◽  
Vol 846-847 ◽  
pp. 888-892
Author(s):  
De Bao Wang ◽  
Mei Lan Yu ◽  
Wen Jing Yang ◽  
Jun Feng Qu
Keyword(s):  
Fourth Order ◽  
Function Method ◽  
Three Dimensional ◽  
Geodetic Network ◽  
Control Network ◽  
Control Points ◽  
Two Dimensional ◽  
Industrial Zone ◽  
Level Control ◽  
Vertical Control

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

scholarly journals Current status of coral reefs in Tioman Island, Peninsular Malaysia

2017 ◽  
Vol 41 ◽  
pp. 294-305 ◽  
Author(s):  
Saad SHAHBUDIN ◽  
Khodzori FIKRI AKMAL ◽  
Salleh FARIS ◽  
Mohammad-Noor NORMAWATY ◽  
Yukinori MUKAI
Keyword(s):  
Coral Reefs ◽  
Peninsular Malaysia ◽  
Current Status

Study on Key Technology in the Control Surveying of Jinan-Qingdao Highway’s South Line

2011 ◽  
Vol 90-93 ◽  
pp. 2853-2857
Author(s):  
De Bao Wang ◽  
Xue Ling Fang
Keyword(s):  
Coordinate System ◽  
High Precision ◽  
Survey Design ◽  
Control Network ◽  
Central Meridian ◽  
Key Technology ◽  
Primary Survey ◽  
Vertical Control ◽  
Vertical Datum ◽  
Selection Of

The south line of Jinan Qingdao highway (which is short of Ji-Qing south line) spans 281km, whose geomorphy is mainly composed by mountain lands and hills. Approximately, it runs from east to west and straddles several projection zones. Systemic conformance of its layout and measurement, high precision in company with multifunctional planes and vertical control nets make up this project’s key technological problems. The report tells of the selection of central meridian in different areas of Ji-Qing south line and the layout, observation, adjustment, height fitting and precision statistics of GPS control network; the layout, observation, adjustment and precision counting of vertical control nets; Meanwhile, it analyses and discusses that how to guarantee the systemic conformance of coordinate system and vertical datum, together with eliminating the division of points’ coordinates and elevation values’ steps when primary survey design are being made synchronously in two super highways or in different areas of the same expressway.

scholarly journals Estimating Canadian vertical datum offsets using GNSS/levelling benchmark information and GOCE global geopotential models

2012 ◽  
Vol 2 (4) ◽  
pp. 257-269 ◽  
Author(s):  
T. Hayden ◽  
B. Amjadiparvar ◽  
E. Rangelova ◽  
M.G. Sideris
Keyword(s):  
High Resolution ◽  
Geoid Height ◽  
Omission Error ◽  
Control Network ◽  
Commission Error ◽  
Vertical Control ◽  
Geopotential Models ◽  
Vertical Datum ◽  
Local Vertical Datum ◽  
Omission Errors

AbstractThe performance of GOCE-based geopotential models is assessed for the estimation of offsets for three regional vertical datums in Canada with respect to a global equipotential surface using the GNSS benchmarks from the first-order vertical control network. Factors that affect the computed value of the local vertical datum offset include the GOCE commission and omission errors, measurement errors, the configuration of the network of GNSS/levelling benchmarks, and systematic levelling errors and distortions propagated through the vertical control network. Among these various factors, the effect of the GOCE omission error on the datum offsets is investigated by extending the models with the high resolution gravity field model EGM2008 and by means of Canada’s official high resolution geoid model CGG2010. The effect of the GOCE commission error in combination with errors from the GNSS/levelling data is also examined, in addition to the effect of systematic levelling errors. In Canada, the effect of the GOCE omission error is at the dm-level when computing local vertical datum offsets. The effect of including accuracy information for the GNSS/levelling data and the GOCE geoid heights can be up to 4 cm over the Canadian mainland and at the dm-level for island regions. Lastly, the spatial tilts found in the levelling network can be modelled with a 2-parameter bias corrector model, which reduces the RMS of the adjusted geoid height differences by 4 cm when compared to the RMS of adjusted geoid height differences computed without the use of a bias corrector model. Thus, when computing local vertical datum offsets in Canada, it is imperative to account for GOCE commission and omission errors, ellipsoidal and levelling height errors, as well as the systematic levelling errors of the vertical control network.

Sign in / Sign up

Export Citation Format

Share Document