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5 In the Field
76 TSC1 Asset Surveyor Operation Manual
Point features: You can remain stationary at a point for a
period of time. The Asset Surveyor software records a number
of GPS positions during this time, based on the configured
logging intervals. After differential correction of these GPS
positions, they are averaged together (in the GPS Pathfinder
Office software) to produce an accurate position for the point
feature.
You can also record point features using a technique known as
quickmarking. To record a quickmark, you press a key on the
TSC1 datalogger at the moment you travel past the feature. The
Asset Surveyor software computes a single instantaneous
position for the feature. Positions obtained by quickmarking are
less accurate, even after differential correction, than averaging a
number of GPS positions together, but quickmarking lets you
collect many features very quickly.
Line features: In order to record a line feature, you travel along
the line. As you do so, the Asset Surveyor software periodically
records GPS positions. These positions are joined together to
form a line.
Area features: In order to record an area feature, you travel
around the perimeter of the area, and the Asset Surveyor
software periodically records GPS positions. These positions
are joined together to form the perimeter of the area. The first
and last GPS positions are joined together to close the area, so
there is no need to return right to the start point.
For applications in which higher accuracy is required, you can
configure the Asset Surveyor software to record GPS carrier phase
data, provided your GPS receiver can compute such data. You can
then process this data with the GPS Pathfinder Office software to yield
accuracy of a few decimeters, or down to centimeter level using the
GPS Pathfinder Pro XR/XRS Centimeter Option.
In general, you must finish collecting one feature before you can
collect another. The exception to this rule is the ability to collect point
features within line or area features, by either nesting or quickmarking
point features.