Campbell-scientific RAWS-F Remote Automated Weather Station for Fire W Manuel d'utilisateur télécharger pdf (Page 38)

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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Campbell-scientific RAWS-F Remote Automated Weather Station for Fire W Manuel d'utilisateur Page 38