Route Survey Of The Stretch Of Road From Oriawo Along Ogbomoso Road, Oyo To School Of Science, Sabo Oyo Town, Atiba Local Government Area, Oyo State

Procedure: As earlier discussed, the longitudinal section was marked out at regular interval of thirty (30) meters and the cross section at seven and half (7.5),seven and half (7.5) meters offset distance from the centre line, distance measured at each  sides were fifteen (15) metres with intermediate point at seven and half (7.5) meters.
          Leveling operation started from known control pillar (bench mark) FSS2/GPS/121 and closed on another known control pillar (bench mark) FSS2/GPS/03.
The level observations started from a benchmark to the first nail (NL1) marked at the commencement of the route that is, where the centre line of the route started (chainage 0+000) this is also known as the first section. The level instrument was set up and leveled in-between the first nail and the benchmark, then back sighted to the staff held on benchmark (FSS2/GPS/121) as first observation after the set up, the reading was read to the staff and recorded. The instruments was turned to the staff held on C0+0000 which was the beginning of the centre line, intermediate sight was observed, then, the staff was placed at the cross section points and L1,L2,R1,R2  
Where:
L1=7.5m left from the centre line
L2=15m left from the centre line
R1=7.5m right from the centre line
R2=15m right from the centre line
were observed as intermediate points. After these the staffs were moved to the next section. One of the observations made to the next section would be foresight after which the instrument position would then change to backsight the same point used as the foresight then the remaining points were then observed as intermediate points on the observation made on the staff that was vertically held on those points.
The procedure continued by making sure that the back sight was made first, followed by the intermediate sight before taken foresight readings. This method was used throughout the route leveling. All observations and measurements were taken and recorded in the field book in accordance with survey rules, regulations and departmental, project instructions.
3.2.4.5 DETAILING
    Details along the route were fixed by Tacheometry method using Theodolite and Staff.Details within the project area that were fixed are Buildings, Roads, Wall- fence, Culvert, Streetlights, Wells, Boreholes, Electric poles,  etc.
During the observation, the use of tacheometry and offset method were employed to effectively fix the details along the project area.Theodolite was set over station, target was set on back station (reference station) and staffs were held on details to be fixed. After bisecting and reading the horizontal circle on the target, the instrument was turned to the vertically held staff placed at the edges of the details found within the area to be fixed. The horizontal and vertical circle reading as well as upper and lower cross hair readings on each staff position were read and recorded.
          In fixing details like building,staffs was positioned at the corner of the building and in fixing details like road,staff was positioned at every change in direction of the road.