Version 2 of the national transformation between NAD27 and NAD83 and its importance for GPS positioning in Canada

Junkins, D R; Erickson, Caroline

doi:10.4095/327554

1996

DOI: 10.4095/327554

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Version 2 of the national transformation between NAD27 and NAD83 and its importance for GPS positioning in Canada

D R Junkins¹,

Caroline Erickson

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“…Consequently, the transformation accuracy computation at each grid node is based on the model proposed by [21] [22] as shown in Equation (22). It gives us the reliability of the transformation process.…”

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confidence: 99%

Modern Development for the Improvement of Accuracy of Nigerian Coordinate Transformation Process Using the Adapted NTv2 Model: The Critical Issues of the Mathematical Algorithm

Hart¹,

Jackson²,

Okeke³

2020

IJG

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Changing coordinates using appropriate mathematical models from one reference system to another may be influenced if the operation requires the change of datum. A set of transformation parameters has been adopted for Nigeria. However, the critical concern usually associated with the problem of transformation of coordinates is the issue of recoverability of the original values of transformed coordinates. The recursive effect of variables associated with spatial problems can be aptly modelled with an appropriate algorithm that set out a process to achieve a definite output. Consequently, the main thrust of this paper is to highlight the critical elements of the mathematical algorithm associated with the National Transformation Version 2 (NTv2) model adapted for the Nigerian Datum Transformation process. The adapted NTv2 model adopts the bi-linear interpolation approach and the covariance function obtained were used to generate transformation elements in latitude (Δφ p) and longitude (Δλ p) and corresponding accuracies at the lattice nodes. The mathematical algorithm of this adapted NTv2 model underscores the likely attainment of better and significant values and statistical indicator of the improved accuracy as the average shift values for latitude and longitude for any transformed points in Nigeria. This capability makes the mathematical algorithm to be adaptable and fit for the purpose of the transformation process. The improvement in the positional accuracy is directly attributable to the application of the NTv2 model which provides a flexible and robust system of modelling any inherent systematic error in the national network.

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confidence: 99%

Modern Development for the Improvement of Accuracy of Nigerian Coordinate Transformation Process Using the Adapted NTv2 Model: The Critical Issues of the Mathematical Algorithm

Hart¹,

Jackson²,

Okeke³

2020

IJG

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Options and strategies fortransition to GPA94

Collier

Leahy

Argeseanu

1997

Australian Surveyor

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Geochemical data management – issues and solutions

Adcock

Spirito

Garrett

2013

GEEA

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Geochemical data are complex, and becoming more so as analytical techniques advance. This complexity gives rise to many data management issues that have no simple solutions. The Geological Survey of Canada (GSC) has a long history of collecting and managing geochemical data. The challenges of managing the data are continuously evolving. The emergence of the WWW is causing a revolution in how scientific data are delivered. This paper documents how one group within the GSC is responding to this rapidly changing environment.

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Version 2 of the national transformation between NAD27 and NAD83 and its importance for GPS positioning in Canada

Cited by 3 publications

References 0 publications

Modern Development for the Improvement of Accuracy of Nigerian Coordinate Transformation Process Using the Adapted NTv2 Model: The Critical Issues of the Mathematical Algorithm

Modern Development for the Improvement of Accuracy of Nigerian Coordinate Transformation Process Using the Adapted NTv2 Model: The Critical Issues of the Mathematical Algorithm

Options and strategies fortransition to GPA94

Geochemical data management – issues and solutions

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