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As-built Survey Of Medium Density Layout
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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.
Available methods of survey
The
boundaries will usually be surveyed by closed theodolite traverse.
Other methods include staring the traverse on checked and proven
boundary beacons and ending same on checked and proven boundary beacons
insofar as the starting and closing beacons form part of the new
boundary of the property surveyed .For any of the methods, the position
closure (after Azimuth adjustment where applicable)shall be 1/5,000.
Field books
All field observation must be entered in the field book clearly with neat booking.
Clear
diagrams: Diagrams of plot survey must be unambiguously represented in
the field book. Such diagram will also show permanent features within
and along area adjacent to the plot.
Electronic field book may also be used.
Computations:
Computation – manual or electronic shall include the following:
Azimuth computation where necessary.
Reduction of bearing showing angular closures.
Distance, measured/corrected.
Un-adjusted/final coordinate/linear closures.
Area computation.
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