1. Documentation
2. Wind
3. Wind Toolkit Data Downloads
4. WTK-LED Alaska

WTK-LED Alaska (/api/wind-toolkit/v2/wind/wtk-led-alaska-download)

Collect and download, as CSV, a configurable set of data fields from a national collection of wind stations. This data represents wind-speed, temperature, direction, and air pressure values at multiple heights above the surface for the years 2018 to 2020.

Request URL

GET|POST /api/wind-toolkit/v2/wind/wtk-led-alaska-download.format?parameters

Request Parameters

NOTE: when using POST to submit a request the api_key must still be included as a query parameter in the url. All other parameters may be included in a POST request as part of the payload.

Response Fields

The response is composed of service-related informational fields and the results of the data query.

Data File Format

Generated data files are formatted in accordance with the Standard Time Series Data File Format. This file format has been developed to support SAM and other NREL models and is documented fully in this PDF. More information on SAM file formats available on the SAM weather page.

Examples

Examples may not reflect this specific dataset.

JSON Output Format

{
    "inputs": {
        "query": {
            "attributes": "winddirection_180m",
            "names": "2017",
            "utc": "false",
            "leap_day": "true",
            "email": "user@company.com",
            "wkt": "POLYGON((-130.756145509839060 48.75520578942107,-130.75571635639668 48.75520578942107,-130.75571635639668 48.75485477666326,-130.75614550983906 48.75485477666326,-130.75614550983906 48.75520578942107))"
        }
    },
    "metadata": {
        "version": "2.0.0",
        "resultset": {
          "count": 1
        }
    },
    "status": 200,
    "outputs": {
        "message": "File generation in progress. An email will be sent to user@company.com when the download is ready.",
        "downloadUrl": "https://mapfiles.nrel.gov/data/wind/ebc9bbbc34f91c65ac50707d43176c6c.zip"
    },
    "errors": []
}

CSV Output Format

Direct streaming of CSV data is supported for single location, single year only. The following response example is truncated after the first few rows of data.

SiteID,Site Timezone,Data Timezone,Longitude,Latitude,Country
80,-9,-9,-130.756,48.75498,b'Canada'
Year,Month,Day,Hour,Minute,wind direction at 180m (deg)
2017,1,1,0,0,347.18
2017,1,1,0,5,347.3
2017,1,1,0,10,347.40000000000003
2017,1,1,0,15,347.52
2017,1,1,0,20,347.66
2017,1,1,0,25,347.79
2017,1,1,0,30,348
2017,1,1,0,35,348.18
2017,1,1,0,40,348.35

POST request example in Python

import requests

url = "http://developer.nrel.gov/api/wind-toolkit/v2/wind/wtk-led-alaska-download.json?api_key=yourapikeygoeshere"

payload = "api_key={{API_KEY}}&attributes=winddirection_180m&names=2017&utc=true&leap_day=true&interval=60&email=user@company.com&wkt=POINT(-179.99 -15.94)"

headers = {
    'content-type': "application/x-www-form-urlencoded",
    'cache-control': "no-cache"
}

response = requests.request("POST", url, data=payload, headers=headers)

print(response.text)

Rate Limits

Rate limits for this application are significantly less than the standard rate limits for developer.nrel.gov. This decrease in the limit is required as the data provided through this service is significantly more computationally intensive to generate and provide. These rate limits are carefully calculated to allow all users the maximum throughput that our servers can sustain.

There are several levels of rate limiting for this service. The first limit determines how many requests a given user can make per 24 hour period. For requests utilizing the .csv format this rate limit is set at 5000 a day at a frequency of no more than 1 per second. For all other requests this limit is set at 1000 requests per day at a frequency of no more than 1 every 2 seconds.

Secondly each user is limited to 20 in-flight requests at any given time.

In addition, the service has a fail-safe mechanism to prevent significant performance decreases that can be caused by unexpectedly high usage of the service. This limit will cause the service to stop accepting requests when the queue reaches a point where additional requests will significantly lower server performance. When this limit is hit, the service will error with a message describing that the request queue is full.

For some tips and tricks to maximize data downloads please read the guide here.

Contact

For questions about the API or the data models please contact wind-toolkit@nrel.gov

Errors

Standard errors may be returned. In addition, the following service-specific errors may be returned: