13-Survey & Map Mode
Noggin
82
13.2.7 Collecting Data using the Odometer
If the Smart System is using an odometer wheel, ensure that the Trigger Method is set to
“Odometer” (
13.3.2.2: p.98
).
As the Smart System moves, the odometer triggers the system to collect a data trace at fixed
distance intervals. This interval is called the “station interval” (
13.3.3.3: p.103
).
For the Noggin 100, the normal station interval is 10 centimeters (3.84 inches).
For the Noggin 250, the normal station interval is 5 centimeters (1.92 inches).
For the Noggin 500, the normal station interval is 2.5 centimeters (0.96 inch).
For the Noggin 1000, the normal station interval is 1.0 centimeter (0.48 inch).
The station interval can be changed to a longer or short distance in the Setup (
13.3.3.3: p.103
).
Each data trace is plotted as a vertical strip (called a “trace”) on the screen (see
Figure 13-1
).
The width of this trace, also called the “Plot Interval”, can be changed to 1, 2, 4, or 8 pixels
(
13.3.3.4: p.106
).
The normal Plot Interval for Noggin 100 and Noggin 250 traces is 2 pixels.
The normal Plot Interval for Noggin 500 and Noggin 1000 traces is 1 pixel.
The odometer units that appear across the top of the screen can be set to either meters or feet
(
13.3.1.3: p.95
).
Smart Systems can normally collect data at a very fast walking pace. However, if the system is
moved too quickly, data can be skipped (see below).
During data acquisition, the current odometer position value (in the current units, either meters or
feet) is written to the lower left corner of the screen (see
Figure 13-1
).
Note that Smart systems can be configured to collect data either by pushing the system (forward)
or pulling the system (reverse). See
13.3.2.1: p.98
about changing the direction of data
acquisition.
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