Campbell Scientific RAWS-H Remote Automated Weather Station - Manual (Page 22)

RAWS-H Remote Automated Weather Station
8. References
AASC, 1985: The State Climatologist (1985) Publication of the American
Association of State Climatologists: Heights and Exposure Standards for
Sensors on Automated Weather Stations, v. 9, No. 4 October, 1985.
(www.stateclimate.org/publications/state-climatologist/NOAA-NCY-
SCBOOKS-SC77097/00000029.pdf)
EPA, 2000: Meteorological Monitoring Guidance for Regulatory Modeling
Applications, EPA-454/R-99-005. Office of Air Quality Planning and
Standards, Research Triangle Park, North Carolina 27711.
EPA, 2008: Quality Assurance Handbook for Air Pollution Measurement
Systems, Vol. IV, Meteorological Measurements, Ver. 2.0, EPA-454/B-08-
002 (revised 2008). Office of Air Quality Planning and Standards,
Research Triangle Park, NC 27711.
Goff, J. A. and S. Gratch, 1946: Low-pressure properties of water from -160°
to 212°F, Trans. Amer. Soc. Heat. Vent. Eng., 51, 125-164.
Lowe, P. R., 1977: An approximating polynomial for the computation of
saturation vapor pressure, J. Appl. Meteor., 16, 100-103.
Meyer, S. J. and K. G. Hubbard, 1992: Nonfederal Automated Weather
Stations and Networks in the United States and Canada: A Preliminary
Survey, Bulletin Am. Meteor. Soc., 73, No. 4, 449-457.
Weiss, A., 1977: Algorithms for the calculation of moist air properties on a
hand calculator, Amer. Soc. Ag. Eng., 20, 1133-1136.
WMO, 2008. Guide to Meteorological Instruments and Methods of
Observation. World Meteorological Organization No. 8, 7th edition,
Geneva, Switzerland.
9. RAWS Orientation
9.1 Determining True North and Sensor Orientation
Orientation of the wind direction sensor is done after the datalogger has been
programmed and the location of True North has been determined. True North
is usually found by reading a magnetic compass and applying the site-specific
correction for magnetic declination; where the magnetic declination is the
number of degrees between True North and Magnetic North. Magnetic
declination for a specific site can be obtained from a USGS map, local airport,
or through the web calculator offered by the USGS (Section 9.2, USGS Web
Calculator). A general map showing magnetic declination for the contiguous
United States is shown in FIGURE 9-1.
Declination angles are always subtracted from the compass reading to find
True North. A declination angle east of True North is reported as positive a
value and is subtracted from 360 (0) degrees to find True North as shown
FIGURE 9-2. A declination angle west of True North is reported as a negative
value and is also subtracted from 0 (360) degrees to find True North as shown
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