Campbell RAWS-P Manual descarregar pdf (Página 31)

RAWS-P Remote Automated Weather Station

FIGURE 8.3-2. A declination angle East of True North (positive) is

subtracted from 360 (0) degrees to find True North

FIGURE 8.3-3. A declination angle West of True North (negative) is

subtracted from 0 (360) degrees to find True North

8.3.2 USGS Web Calculator

The USGS provides an easy way of determining 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 8.3-4 shows an

example for Logan, UT.

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Campbell RAWS-P Manual Página 31