A Comparison of RTK-GPS Vertical Component With Precise Digital Level for Estimating Volumes

Zaia, Yousif Youkhanna; Adam, Sarhat Mustafa; Gilyana, Sami Mamlook

doi:10.26682/sjuod.2017.20.1.34

Cited by 2 publications

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References 3 publications

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“…The moving of enormous amounts of earthwork is one of the key building procedures, and earthworks are regarded as the most expensive plan (Deakin, 2005). Data may be gathered for these projects utilizing a variety of surveying methods, including levelling, total stations, GNSS, and laser scanning (Zaia, et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Improved Accuracy of Elevations Obtained From RTK and Kinematic Data and Its Impact in Calculating Earthworks

Shaheen

2023

Journal of Al-Azhar University Engineering Sector

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For many surveying applications in civil engineering, Global Navigation Satellite Systems (GNSS) are proving to be an attractive data collection and measurement technology. Real-Time kinematics (RTK) and kinematics are the most well-known observation techniques. However, the RTK and kinematics accuracy still falls short of the accuracy needed for some engineering projects, particularly those depending on the heights. This research aims to improve the accuracy of heights derived using RTK and kinematic methods data and to evaluate the using of improved heights in estimating earthworks. In the improvement process, the idea of eliminating systematic errors was used. The amount of error was first computed at a control point at the start of the task, and then the amount of this error was subtracted from the heights of the remaining points. A variety of statistical criteria and measures of quality of fit were employed to evaluate the performance of the models under study, and the outputs of the various models were then compared. The study's conclusions showed that the accuracy of heights from RTK and kinematic data had increased by 71% and 52%, respectively. Researchers or professionals that need to successfully adapt RTK and kinematic techniques to their applications might benefit from the experiences with the increased RTK and kinematic data.

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Section: Introductionmentioning

confidence: 99%

Improved Accuracy of Elevations Obtained From RTK and Kinematic Data and Its Impact in Calculating Earthworks

Shaheen

2023

Journal of Al-Azhar University Engineering Sector

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Direct risk factors and cost performance of road projects in developing countries

Ogbu

Adindu

2019

JEDT

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Purpose Globally, road projects are notorious for riskiness, which often results in cost overruns. In developing countries, these risks are amplified by economic instabilities and institutional failures. Majority of road projects in these countries are awarded to notedly inept indigenous contractors. Currently, research on the relationship between risks and cost performance of road projects has predominantly focussed on the client’s perspective. Effects of risks on contractors’ cost performance (profit) are inadequately investigated in literature. The purpose of this paper is to determine the relationship between direct risks and cost performance of road projects by indigenous contractors of developing countries from the contractors’ perspective. Design/methodology/approach The multivariate structural equation modelling technique was used to analyse purposively obtained data from indigenous contractors that recently completed road projects in Nigeria. Findings It was observed that a significant positive relationship exists between the aggregate project risk, i.e. project risk index of cost (PRIC) and cost performance of the projects. Significant positive relationships were also found to exist between identified cost risk centres and PRIC and between risk factors and cost risk centres. The risk centre site environment and location contributes the most to PRIC. Research limitations/implications Indigenous contractors of developing countries are to analyse the identified risk factors and centres prior to bidding for road projects and carefully manage them during project execution. Originality/value Future studies of risks in road project should aim to obtain project risk indices of costs for the projects.

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A Comparison of RTK-GPS Vertical Component With Precise Digital Level for Estimating Volumes

Cited by 2 publications

References 3 publications

Improved Accuracy of Elevations Obtained From RTK and Kinematic Data and Its Impact in Calculating Earthworks

Improved Accuracy of Elevations Obtained From RTK and Kinematic Data and Its Impact in Calculating Earthworks

Direct risk factors and cost performance of road projects in developing countries

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