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5 In the Field
B Tip
Each time you select a feature from this menu, the Asset Surveyor
software records a quickmark position for that feature, along with the
default attribute values.
Quickmarking is particularly useful when features lie along the
roadside (for example, street furniture, power poles, or bridges).
You can record quickmarks instead of normal (averaged) point
features, and you can record quickmarks within line or area features.
For more information on quickmarking and for more information of
how to configure and edit attributes for quickmarked features, refer to
Chapter 3, Data Collection, in the TSC1 Asset Surveyor Software User
Guide.
– If you are usually unable to travel right over top of each feature,
configure a constant offset for quickmark features, as described in the
following section. You can then travel past each feature at the specified
distance and record it as an offset quickmark.
Offsets and laser rangefinders
The offset feature in the Asset Surveyor software lets you record the
position of a geographical feature, without actually having to position
your GPS receiver directly over that feature. You may often find this
facility very useful because it may be difficult, inconvenient, or even
impossible, to position a GPS receiver over a feature and obtain GPS
positions.
Some examples where offsets might be used are:
86 TSC1 Asset Surveyor Operation Manual
when collecting a tree feature. It is typically easier to stand
some distance (for example, ten paces to the north) from the
tree and record its attributes, firstly to ensure good GPS
receptionandsecondlysoastobeabletoseethetreeclearly
and assess its condition. You can then specify an offset to the
tree of ‘10 m south’. This ensures that the tree will be
positioned correctly in your GIS. This is an example of an offset
point feature.