Data Access Form

Dataset Title:	RV Sikuliaq : Anemometer Metek_8639 : Relative Wind Direction : 600 s binned
Institution:	UAF (Dataset ID: relativewinddirection_degrees_anemom098639_600sbin)
Information:	Summary \| License \| Metadata \| Background \| Make a graph

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Variable	Optional Constraint #1		Optional Constraint #2		Minimum	Maximum
time (UTC)
spot_time (UTC)
spot_value (degrees)
mean (degrees)
stddev (degrees)
minimum (degrees)
maximum (degrees)
median (degrees)
num_values (unitless)

Server-side Functions

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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  time {
    String _CoordinateAxisType "Time";
    String axis "T";
    String ioos_category "Time";
    String long_name "Time";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  spot_time {
    String ioos_category "Time";
    String long_name "Spot Time";
    String time_origin "01-JAN-1970 00:00:00";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  spot_value {
    String ioos_category "Statistics";
    String long_name "Relative Wind Direction Spot_Value";
    String short_name "relative_wind_direction_spot_value";
    String special_notes "Binning type: circular";
    String standard_name "x_spot_value";
    String units "degrees";
  }
  mean {
    String ioos_category "Statistics";
    String long_name "Relative Wind Direction Mean";
    String short_name "relative_wind_direction_mean";
    String special_notes "Binning type: circular";
    String standard_name "x_mean";
    String units "degrees";
  }
  stddev {
    String ioos_category "Statistics";
    String long_name "Relative Wind Direction Stddev";
    String short_name "relative_wind_direction_stddev";
    String special_notes "Binning type: circular";
    String standard_name "x_stddev";
    String units "degrees";
  }
  minimum {
    String ioos_category "Statistics";
    String long_name "Relative Wind Direction Minimum";
    String short_name "relative_wind_direction_minimum";
    String special_notes "Binning type: circular";
    String standard_name "x_minimum";
    String units "degrees";
  }
  maximum {
    String ioos_category "Statistics";
    String long_name "Relative Wind Direction Maximum";
    String short_name "relative_wind_direction_maximum";
    String special_notes "Binning type: circular";
    String standard_name "x_maximum";
    String units "degrees";
  }
  median {
    String ioos_category "Statistics";
    String long_name "Relative Wind Direction Median";
    String short_name "relative_wind_direction_median";
    String special_notes "Binning type: circular";
    String standard_name "x_median";
    String units "degrees";
  }
  num_values {
    String ioos_category "Statistics";
    String long_name "Relative Wind Direction Num_Values";
    String short_name "relative_wind_direction_num_values";
    String special_notes "Binning type: circular";
    String standard_name "x_num_values";
    String units "unitless";
  }
 }
  NC_GLOBAL {
    String cdm_data_type "Other";
    String contributor_name "RV Sikuliaq";
    String contributor_role "Data collector";
    String creator_name "CORIOLIX, RDESC, RCRV Project, Oregon State University";
    String creator_url "http://ceoas.oregonstate.edu";
    String history 
"2026-05-02T17:23:01Z (source database)
2026-05-02T17:23:01Z https://coriolix.sikuliaq.alaska.edu/erddap/tabledap/relativewinddirection_degrees_anemom098639_600sbin.html";
    String infoUrl "https://www.uaf.edu/cfos/sikuliaq/";
    String institution "UAF";
    String keywords "atmosphere, data, observations, ocean";
    String license 
"The data may be used and redistributed for free but is not intended
for legal use, since it may contain inaccuracies. Neither the data
Contributor, ERD, NOAA, nor the United States Government, nor any
of their employees or contractors, makes any warranty, express or
implied, including warranties of merchantability and fitness for a
particular purpose, or assumes any legal liability for the accuracy,
completeness, or usefulness, of this information.";
    String sourceUrl "(source database)";
    String standard_name_vocabulary "CF standard name";
    String summary 
"Relative Wind Direction 600 s binned time series data.
Vessel: RV Sikuliaq. Sensor Model: Metek uSonic-3 Scientific {formerly: USA-1} ultrasonic anemometer
Sensor S/N: 0114098639
Sensor Location Onboard: Forward Mast
Sensor Description: Metek Ultrasonic Anemometer uSonic-3 omni HD, RS422
Parameter Description: Calculated meteorological relative wind is defined as the wind vector measured relative to the ship. The relative wind direction is the direction relative to the bow of the ship from which the wind is blowing with the relative wind speed. Direction conventions are 0 deg for wind from the bow, 90 deg for wind from the starboard side, 180 deg for wind from the stern, and 270 deg for wind from the port side.";
    String title "RV Sikuliaq : Anemometer Metek_8639 : Relative Wind Direction : 600 s binned";
  }
}

Using tabledap to Request Data and Graphs from Tabular Datasets

tabledap lets you request a data subset, a graph, or a map from a tabular dataset (for example, buoy data), via a specially formed URL. tabledap uses the OPeNDAP (external link)

Data Access Protocol (DAP) (external link)

and its selection constraints (external link)

The URL specifies what you want: the dataset, a description of the graph or the subset of the data, and the file type for the response.

(easy) You can get data by using the dataset's Data Access Form or Subset form. They make the URL for you.
(easy) You can make a graph or map by using the dataset's Make A Graph form. It makes the URL for you.
(not hard) You can bypass the forms and get the data or make a graph or map by generating the URL by hand or with a computer program or script.

Tabledap request URLs must be in the form
https://coastwatch.pfeg.noaa.gov/erddap/tabledap/datasetID.fileType{?query}
For example,
https://coastwatch.pfeg.noaa.gov/erddap/tabledap/pmelTaoDySst.htmlTable?longitude,latitude,time,station,wmo_platform_code,T_25&time>=2015-05-23T12:00:00Z&time<=2015-05-31T12:00:00Z
Thus, the query is often a comma-separated list of desired variable names, followed by a collection of constraints (e.g., variable<value), each preceded by '&' (which is interpreted as "AND").

For details, see the tabledap Documentation.

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