On the Conversion of Coordinates from Nigeria Transverse Mercator to Universal Transverse Mercator Using a Simple Mathematical Model
Edan, J. D; Amadi, J. W; Bem, A. A.; Amadi, C. A

Abstract
In this paper, effort has been made to transform coordinates from Nigerian Transverse Mercator (NTM) system to Universal Transverse Mercator (UTM) system using a Simple Mathematical Model. The data used are the simulated UTM coordinates of points in the Mid Belt of UTM projection system which also fall in zone 32 of the UTM projection system, which also covers Rivers State of Nigeria. The equivalent NTM coordinates of these points were obtained using the Defense Mapping Agency (DMA) Multiple Regression Equations as programmed in Geographic Calculator software. An orthophoto imagery used by the Rivers State Government Geographic Information System (RIVGIS) to chart surveys in the State was used to overlay the results obtained by the Model All the computations were carried out using Microsoft excel program. Based on the results obtained by the Mathematical Model, it can be inferred that the Model is an alternative tool for coordinate transformation from NTM system to UTM system. The analysis further revealed that the error does not follow a progressive pattern, which indicates that the Model is not good enough for geodetic or engineering purposes. However, the results show that the Model is significant for plane surveys where calculating land composition and topography considers a set expanse of land as a flat plane.

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