Campbell-scientific RAWS-F Remote Automated Weather Station for Fire W Manual de usuario Pagina 38

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RAWS-F Remote Automated Weather Station for Fire Weather
FIGURE 8-2. A declination angle east of True North (positive) is
subtracted from 360 (0) degrees to find True North
FIGURE 8-3. A declination angle west of True North (negative) is
subtracted from 0 (360) degrees to find True North
8.2 USGS Web Calculator
The USGS provides an easy way of determining the declination of a specific
site. Since magnetic declination fluctuates with time, it should be adjusted
each time the wind sensor orientation is adjusted. The calculator can be
accessed at: www.ngdc.noaa.gov/geomagmodels/Declination.jsp. FIGURE 8-4
shows an example for Logan, UT.
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