Abstract
This study was carried out to determine 3D-position of selected points within Obafemi Awolowo University. The points were located at Africa Regional Institute for Geospatial Information Science and Technology (AFRIGST), Central Technological and Laboratory Workshops (CTLW), main Bus Stop, Religion ground, New Environmental Design and Management (New EDM), and Spider building. China HuaCe Corporation (CHC) GPS and Promark 3 GPS were used to carry out observation on the selected points. The data gotten were post processed using GNSS solution software for Promark3, Compass software for CHC GPS and the result gotten were compared with the known coordinates of those points. The data was analyzed using Statistical Package for Social Sciences (SPSS) to determine the most accurate instrument between the two. The occupation time for the two instruments on each station was 45 minutes. Analysis of Variance (ANOVA) and Chi square Variance analysis were conducted, the result showed that there is no significant difference between the observations of the two instruments in comparison with the adjusted coordinate. It can be concluded that any of the two instruments can be used for 3D point positioning to obtain accurate result.
Highlights
To determine a position, it must be referenced to a known point, such as control [2]
Software for data processing The software that was used for data collection, processing and spatial analysis include Global Navigation Satellite System (GNSS) Solution software for ProMark 3 post processing, Statistical Package for Social Sciences (SPSS), Notepad, Matlab, Compass post processing software for China HuaCe Corporation (CHC) Global Positioning System (GPS), and AutoCAD
Since the two-sided asymptotic significance of the Chisquare value (0.375) is greater than α at 0.05, and Chi-square (χ2) calculated is 36 which is less than Chi-square critical value at degree of freedom of 55.76, the null hypothesis (Ho) states that there is no significant difference between pattern of Easting resulted from the Adjusted coordinates and any of Static or Stop-and Go coordinates the result is hereby accepted
Summary
It must be referenced to a known point, such as control [2]. During the 1970s advent of technology in the field of surveying brought about new and unique approach to surveying, different instruments which give better accuracy and save time such as Global Positioning System (GPS), Total Station, Work Station and other Global Navigation Satellite System (GNSS) instruments emerged. These systems can be operated day or night and do not require clear line of sight between base and rovers at survey stations. This study will compare different GNSS techniques in 3D position determination
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