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As-built Survey Of Medium Layout
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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.
Marks
on boundary walls, a cross ‘x’ with identification number shall be cut
and painted on the outside wall where it intercept surveyline. Public
survey shall carry double arrows.
Large concrete beacons/markers may be used for right of way survey (ROW).
Location of boundary beacons.
All
corners of plot including point of changes in direction and on straight
long lines at intervals of not more than 250m in layouts and 400m in
farmland.
Requirements of boundary beacons.
Adjacent boundary
beacons should be inter visible, but where for some reasons this is not
possible, multiple observation from proven station or pair of stations
to fix a beacon.
Survey of boundaries.
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