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Locating the ISS and Anemometer
16
For agricultural applications (Important for evapotranspiration (ET) calculations):
• Install the ISS and anemometer as a single unit with the radiation shield 5'
(1.5 m) above the ground and in the middle of the farm between similar crop types
(i.e. two orchards, two vineyards or two row crops), if possible.
• Avoid areas exposed to extensive or frequent applications of agricultural chemicals
(which can degrade the sensors).
• Avoid installation over bare soils. The ET formula works best when the ISS is
installed over well-irrigated, regularly mowed grass.
• If the last three guidelines cannot be met, install the weather station at the edge of
the primary crop of interest.
Anemometer Siting Guidelines
• For best results, place the anemometer at least 7' (2.1 m) above surrounding obstruc-
tions such as trees or buildings that obstruct wind flow.
• If mounting on a roof, mount the anemometer at least 7' (2.1 m) above the roof apex
(when using a Mounting Tripod, install the anemometer at the very top of the pole).
• If mounting the ISS and the anemometer together, such as on a pole or a wooden post,
mount the anemometer so it is at least 12'' (0.3 m) above the top of the rain collector
cone for best results.
• The standard for meteorological and aviation applications is to place the anemometer
33' (10 m) above the ground. Seek professional help for this type of installation.
• The standard for agricultural applications is to place the anemometer 6' (2 m) above
the ground. This is important for evapotranspiration (ET) calculations.
Note: For roof mounting, and ease of installation, we recommend using the optional mounting tripod
(#7716). For other installations, use the Mounting Pole Kit (#7717).
Note: For more detailed siting suggestions, see Application Note #30 on the Davis Support web site
(http://www.davisnet.com/support/weather).
07395.249 Manual ISS Installation_RevE_Final_Print.pdf 18 4/7/2008 1:44:49 PM