Vaisala Energy Support
Why do we show a +/- next to the annual value?
The annual mean wind speed value we provide is our best estimate of the actual mean value. The +/- (plus or minus) symbol indicates that the true annual mean value is within a range plus or minus the number shown after the provided wind speed value. The Prospecting Tools directly incorporate a confidence interval for the annual mean wind speed data, showing a range of expected wind speed values, to provide a realistic assessment. We are 68% confident that the true annual mean wind speed for a given location falls inside the displayed range. The narrower the range of wind speeds, (i.e. the smaller the +/- value we show) the more confidant we are concerning the long-term annual mean wind speed value.
For any location, the annual mean range is only meant to be used at the prospecting stage and doesn’t present the full story of a potential site. Data on annual and diurnal variability, prevailing wind direction, and many other atmospheric factors are necessary to more accurately assess the wind resource at any given location. For a more precise estimate of a wind resource at a location, 3TIER’s FullView Wind Site Climate Variability Analysis can incorporate your observational data.
More Wind Online Tools Questions
- How do I enter a location?
- How do I interpret the graph provided by the Monthly Mean Wind Speed Tool?
- What does the Annual Mean Wind Speed Tool provide?
- How do I interpret the wind rose provided by the Annual Mean Wind Rose Tool?
- What does the Wind Speed Distribution Tool provide?
- What wind speeds are shown on the map?
- How can I compare sites side-by-side?
- What affects wind at a given site?
- How do I change locations for individual tools?
- What is a hub height?
- What makes a good wind resource?
- What is a wind resource assessment?
- What do the colors on the map mean?
- What is the source of the information?
- How accurate are the Wind Prospecting Tools?
- Why does the map disappear?
- How was the 5 km global wind dataset created?
- Does 3TIER incorporate observational data?
- What were 3TIER's data validation procedures for the 5 km global wind dataset?
- What happened to 3TIER’s Reference Wind Time Series Product?
- Why do all the various datasets have different start and end times?
- Doesn’t horizontal resolution matter? What about downscaling with weather models like WRF and MM5?
- Why are the long-term mean values of each data set so similar and why don’t they match the values I get when I download these data directly from the various global modeling centers?
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