Difference between revisions of "HIP:wind"
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Colin will look into how to do damping of the direction and speed readimg. | Colin will look into how to do damping of the direction and speed readimg. | ||
| + | |||
| + | == Placement == | ||
| + | *The international standard for anemometer height above the ground is 10 meters (33 feet) with no obstructions. [2] | ||
| + | |||
| + | == Keeping Records == | ||
| + | |||
| + | === Sampling Standards === | ||
| + | * Mean Wind Speed and Direction: 2-minute mean of speed and direction sampled before the observation valid time sampled from high-resoluation data (minimum: 5 second instrument polling). | ||
| + | * Wind direction is recorded in degrees from true north [1 19][2 ]. | ||
| + | |||
| + | === Calculations === | ||
| + | |||
| + | * The mode is consisidered the prevailing wind direction. [1 19] | ||
| + | * Dividing each recording into a north-south and east-west vector, averaging them, and then reassembling the vectors. [1 19] | ||
| + | |||
| + | International Weather Watchers Observer Handbook | ||
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http://www.windustry.org/resources/WIND%20PROSPECTING_Monitoring%20at%20Site_FEB05.pdf | http://www.windustry.org/resources/WIND%20PROSPECTING_Monitoring%20at%20Site_FEB05.pdf | ||
| − | + | ||
*CWOP requires wind direction reports in degrees from true north. | *CWOP requires wind direction reports in degrees from true north. | ||
Revision as of 10:30, 3 April 2006
Colin will look into how to do damping of the direction and speed readimg.
Contents
Placement
- The international standard for anemometer height above the ground is 10 meters (33 feet) with no obstructions. [2]
Keeping Records
Sampling Standards
- Mean Wind Speed and Direction: 2-minute mean of speed and direction sampled before the observation valid time sampled from high-resoluation data (minimum: 5 second instrument polling).
- Wind direction is recorded in degrees from true north [1 19][2 ].
Calculations
- The mode is consisidered the prevailing wind direction. [1 19]
- Dividing each recording into a north-south and east-west vector, averaging them, and then reassembling the vectors. [1 19]
International Weather Watchers Observer Handbook
- Wind Speed
- Wind Gust
http://www.ndbc.noaa.gov/wndav.shtml http://www.windustry.org/resources/WIND%20PROSPECTING_Monitoring%20at%20Site_FEB05.pdf
- CWOP requires wind direction reports in degrees from true north.
Sampling Standards
- Mean Wind Speed and Direction: 2-minute mean of speed and direction sampled before the observation valid time sampled from high-resoluation data (minimum: 5 second instrument polling).
- Gust: Maximum 'instantaneous' wind value observed in the 10 minutes before the observation time.
CWOP
External links
CWOP Weather Station Siting, Performance, and Data Quality Guide
- Averaging Wind Speed and Direction
- Wind Energy Resource Atlas of the United States
- Vector vs. Scalar Averaging of Wind Data
[Farmland] lists wind direction, speed, and gust.
