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Windrose API

The Windrose API returns Windrose data from a custom location and time range.

  • All parameters are available in their original source spatial resolution.
  • A request computes 227+ parameters, at the Daily Temporal level.
  • Meteorological parameters are derived from the NASA's GMAO MERRA-2 assimilation model.

Methodology

The percent of time the wind is in each power class is computed for 16 Direction Ranges.

Wind Power Classes

There are 8 custom wind power classes used based on National Renewable Energy Laboratory's (NREL) Classes of Wind Power Density.

Wind Power Classes Table
Class Start (m/s) End (m/s)
Class 1 0 4.4
Class 2 4.4 5.1
Class 3 5.1 5.6
Class 4 5.6 6.0
Class 5 6.0 6.4
Class 6 6.4 7.0
Class 7 7.0 9.4
Class 8 9.4 +

Direction Ranges

There are 16 direction ranges computed.

Direction Ranges Table
Direction Start (°) End (°)
N 348.75 11.25
NNE 11.25 33.75
NE 33.75 56.25
ENE 56.25 78.75
E 78.75 101.25
ESE 101.25 123.75
SE 123.75 146.25
SSE 146.25 168.75
S 168.75 191.25
SSW 191.25 213.75
SW 213.75 236.25
WSW 236.25 258.75
W 258.75 281.25
WNW 281.25 303.75
NW 303.75 326.25
NNW 326.25 348.75

Formats

Formats Available Notes
JSON Yes
CSV Yes
ASCII Yes

Request Structure

  • The request arguments can be in any order after the question mark.
  • A single parameter can be requested or a list of Parameters can be requested, with one of the following list separators: ',' or '%2C'.

To help construct and test your API requests please use the API Pages for the POWER Windrose API.

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/api/application/windrose/point?longitude=-84.43&latitude=33.64&start=19900101&end=20141231&format=ASCII
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/api/application/windrose/point?longitude=-84.43&latitude=33.64&start=19900101&end=20141231&format=CSV
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/api/application/windrose/point?Longitude=-84.43&latitude=33.64&start=19900101&end=20141231&format=JSON