Campbell-scientific WINDSONIC 2-D Sonic Wind Sensors Manual do Utilizador descarregar pdf (Página 38)

Appendix A. WindSonic Orientation

Declination angles east of True North are considered negative, and are

subtracted from 360 degrees to get True North as shown FIGURE A-2 (0° and

360° are the same point on a compass). Declination angles west of True North

are considered positive, and are added to 0 degrees to get True North as shown

in FIGURE A-3.

For example, the declination for Longmont, CO (10 June 2006) is 9.67°, thus

True North is 360° ─ 9.67°, or 350.33° as read on a compass. Likewise, the

declination for McHenry, IL (10 June 2006) is ─2.68°, and True North is

0° ─ (─2.68°), or 2.68° as read on a compass.

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

subtracted from 360 (0) degrees to find True North

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

subtracted from 0 (360) degrees to find True North

A-2

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Campbell-scientific WINDSONIC 2-D Sonic Wind Sensors Manual do Utilizador Página 38