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| Determination of Displacement In Obajana And Environs Using Precise Point Positioning |
Guma, Edward Pishikeni, Matthew N. Ono, Sule, Zekeri Onucheyo
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Abstract:
The knowledge of displacement tends to explain the rate of dynamism in and around an area. Of course, displacement can be horizontal and vertical. The horizontal has to do with the Easting and Northing direction of any point whereas, the vertical displacement deals with the Height coordinate alone. This study aimed at determining the displacement of Obajana and environs using Precise Point Positioning. The study involved establishing of observation points at Obajana and few other towns. Observations were carried out with a Single Point Positioning (SPP) technique on static mode. The duration at which the receiver acquired satellite signal was averagely one hour. Raw GNSS data acquire were downloaded from the receiver and then, uploaded to online CSRS-PPP online solution. The results were processed into Eastings, Northings and Heights coordinates of the various observation points. The horizontal peak displacement formula was used to find the horizontal displacement between last phase of observation and the first phase of observation. For the vertical displacement, height differencing between last and first observation was computed. The results were in centimeter and millimeter range. The horizontal displacement were in centimeter and millimeter level and same for the vertical displacement was achieved. It is therefore recommended that, geoidal heights of all the major regions in Nigeria, be determined because reliance on global geoid may not provide accurate height information than regional geoidal undulations.
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