BMP - Tree Risk Assessment - 15
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Walk-by is a limited visual inspection of one or more sides of the
tree, performed as the inspector walks past a tree. The inspector may
need to stay on the sidewalk or footpath, on public property, or within
a right-of-way. The scope of work may, in some cases, specify that
the assessor must walk around certain trees to gain a more complete
perspective.
Drive-by (windshield) is a limited visual inspection of one side of
the tree, performed from a slow-moving vehicle. The scope of work
also may specify that the inspector must walk around certain trees
or record images to verify or document observations. This type of
inspection is often performed by municipalities, utilities, or other
agencies or landowners who have large populations of trees to inspect
with limited budgets.
Aerial patrol is observation made from an aircraft overflying utility
rights-of-way, other areas, or individual trees. This type of inspection
is conducted by some electric utility companies or their contractors
to identify threats to the electric transmission system. Unmanned
aerial vehicles (UAV) may be used for either Level 1 or Level 3
inspections. Sometimes a more detailed, ground-based inspection
may be specified to confirm observations. Images may be recorded
to document observations.
LiDAR (Light Detection and Ranging), is a remote sensing method
that uses laser technology to measure tree size and location in relation to the target of concern. In this case, the assessor may focus on
the likelihood of impact if a failure were to occur.
When a tree of concern is identified, certain specified information about that
tree should be recorded. At a minimum, this information should include the
tree location and any recommended remedial action. In addition, it may include the species name, tree size, defect or condition identified, and a work
priority. A higher level of inspection may also be recommended, if that option
is included in the scope of work.
A constraint of limited visual inspections is that some conditions may
not be visible from a one-sided inspection of a tree, nor are all conditions
visible on a year-round basis. Also, a Level 1 risk assessment may not be
adequate to make a risk mitigation recommendation. The assessor may use
the Level 1 inspection to determine which trees require further inspection
at the basic or advanced levels after which an appropriate mitigation can
be recommended.
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BMP - Tree Risk Assessment
Table of Contents for the Digital Edition of BMP - Tree Risk Assessment
Table of Contents
BMP - Tree Risk Assessment - Cover1
BMP - Tree Risk Assessment - Cover2
BMP - Tree Risk Assessment - i
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BMP - Tree Risk Assessment - Table of Contents
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