Campbell HydroSense II Series, Руководство по эксплуатации продукта

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HS2 and HS2P
20
more than four satellites, it will use the additional data to determine a more
accurate position.
9.1 GPS Synchronization
The GPS receiver needs a clear view of the sky to reliably calculate position.
When the receiver resolves the current position, it has achieved
“synchronization”.
The GPS antenna is located inside the display above the LCD. The antenna
faces toward the sky when the display is held upright in a comfortable reading
position.
To synchronize the GPS, take the HydroSense II outside, away from tall
buildings or large obstructions and turn it on. GPS synchronization will
normally be achieved in approximately 30 seconds, but may take up to a
minute or more. The HydroSense II indicates that synchronization has been
achieved by displaying the GPS sync icon (
) on the main screen
(p. 15)
.
When the GPS is synchronized, the internal clock of the HydroSense II is
adjusted to match GPS time to within one millisecond. GPS can be disabled
using the
configuration menus
(p. A-1)
.
9.2 Geotagging and Zones
When the GPS module is enabled, the HydroSense II is able to store water
content data tagged with position information (latitude and longitude).
Using this position information, data can be grouped by geographical location.
These geographical areas are referred to as “zones” and are characterized by a
cent re coordinate and radius. Volumetric water content values are grouped,
filtered and charted by the computer software based on the zone in which the
data was collected.
The HydroSense II keeps a table of up to 100 GPS zones in memory and
searches through this table every few seconds to determine if it is within the
boundary of a zone. When it has determined that the user is within a zone, it
displays the zone name on the
main screen
(p. 15)
.
Zones can be created when data are stored. When the Store
(p. 14)
button is
pressed, and the HydroSense II determines that the current location is not in an
existing zone, CREATE A NEW ZONE? is displayed.