Abstract
The emergence of the Global Positioning System (GPS) receiver over the years has afforded the avenue to acquire data from various geospatial locations. This paper analyses and compares the accuracy of point positions collected using three Global Positioning System (GPS) receivers— South H66/H88, Sokkia radian IS, and ProMark 3. A field study was conducted on 5 control points within the Federal University of Technology Akure (FUTA) Campus. The One-way ANOVA test performed for the coordinates obtained from the three GPS receivers at an alpha level of 0.05 using SPSS version 16 reveals no statistically significant difference between the coordinates. Analysis of the result shows that South GPS, Sokkia GPS, and ProMark GPS receivers had horizontal misclosure values of 0.1337, 0.1625 and 0.2425 respectively, making South GPS best in obtaining accurate information onhorizontal positions. For the vertical position, misclosure values of 0.0902, 0.2336, and 0.2771 respectively were obtained for the Three GPS receivers, thereby revealing that Sokkia GPS performed optimally in obtaining heights above the ellipsoid. However, as a combination of horizontal and vertical positions (3-Dimension), Sokkia GPS performed best while ProMark GPS performed averagely and South GPS performed least. This study shows that any of the three GPS receivers can provide reasonable accurate geographic data. However, a definite conclusion remains that the selection of an optimal GPS receiver in this study for any project will largely depend upon the user’s needs and project requirements as the significant variation observed in the height coordinates should be further investigated.
 Keywords: GPS Receivers, Accuracy, Position Determination, GPS Coordinates
Highlights
Global Positioning System (GPS) receivers have become widely used over recent years to improve efficiency and accuracy with applications, ranging from hunting to surveying, benefiting immensely from these devices
A field study of various GPS receivers for data collection will help to understand the differences in accuracy obtainable from these receivers and their possible areas of application
To ensure the quality of the data acquired in this study, the GPS receivers were subjected to the best operating condition and the observation procedures were identical for all the five stations and days
Summary
GPS receivers have become widely used over recent years to improve efficiency and accuracy with applications, ranging from hunting to surveying, benefiting immensely from these devices When using these receivers to collect data, accuracy is very important. Kindra and Keith (2006) presented a paper comparing the precision and accuracy of five current Global Positioning System (GPS) receivers—Trimble ProXR, Trimble GeoXT without Wide Area Augmentation System (WAAS), Trimble GeoXT with the WAAS, Trimble GeoExplorer II, and an HP/Pharos receiver. They conducted a field study of 15 established survey markers in the City of Pocatello, Idaho. Reconnaissance and field survey planning: A schematic representation of the project procedure is presented in figure 2
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