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As-built Survey Of Medium Density Layout
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SPECIFICATIONS
Angular Observations:
Type of instrument-minimum of 20â€graduation interval.
Number of observation- 2 zeros(face left/face right).
Accuracy of observation- the maximum spread of 2 zeros valves shall be 20 seconds.
Linear Observations:
Type of equipment: EDM
Method
of measurements: on level smooth ground, surface taping may be
employed. On rough terrain catenary tapping may be used, preferably EDM
Accuracy of measurement: standard error of linear measurements should be
one part in 20,000. Differences between two observations should exceed
1cm.
Instrumentation; Any instrument including electronic
theodolites, total stations or GPS capable of achieving the above
accuracies or better may be used.
Accuracy:
Four set of observations (for doubtful latitude pair East/West observations).
Angular spread -10†0n 4 zeros.
Bearing closure at Azimuth check points not to exceed 30â€Â±N, where “N†is the number of instrument stations.
Plotting of plan:
Plotting should be done by rectangular coordinates, details and irregular boundaries by offsets or bearing and distances.
Plans shall show clearly defined plot boundaries, detail within and along the boundary.
Heading for a certified plan:
Should include:
Title of survey.
Locality- street–town/village, Local Government Area and state.
Scale and with its linear representation
North Arrow/origin ,AREA
Demarcation of Boundaries
Type of beacons:
Property beacons shall be 18cm×18cm×75cm.
Cemetry beacons shall be 10cm×10cm×60cm.
Spikes shall be rod pin 40mm marked with the center punch mark at the top.
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