Data Access Form

Dataset Title:	VFPA, Vancouver Harbour, 2nd Narrows Rail Bridge, Current, 2sec, v1
Institution:	UCB EOAS, DFO IOS & VFPA (Dataset ID: ubcVFPA2ndNarrowsCurrent2sV1)
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Make a graph

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Variable	Minimum	Maximum
time (UTC)	2017-11-21T00:00:00Z	2024-11-20T23:58:00Z

speed (Current Speed, kts)	0.0	25.0
direction (Current To Direction, degree)	38.0	328.0
longitude (degrees_east)	-123.0247222	-123.0247222

latitude (degrees_north)	49.2938889	49.2938889

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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.5112224e+9, 1.73214708e+9;
    String axis "T";
    String calendar "proleptic_gregorian";
    String cf_role "timeseries_id";
    String comment "time values are UTC";
    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";
  }
  speed {
    Float64 _FillValue -999.9000000000001;
    Float64 actual_range 0.0, 25.0;
    Float64 colorBarMaximum 5.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Currents";
    String long_name "Current Speed";
    String name "speed";
    String standard_name "sea_water_speed";
    String units "kts";
  }
  direction {
    Float64 _FillValue -999.9000000000001;
    Float64 actual_range 38.0, 328.0;
    Float64 colorBarMaximum 360.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Currents";
    String long_name "Current To Direction";
    String name "direction";
    String standard_name "direction_of_sea_water_velocity";
    String units "degree";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float64 _FillValue NaN;
    Float64 actual_range -123.0247222, -123.0247222;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String name "longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float64 _FillValue NaN;
    Float64 actual_range 49.2938889, 49.2938889;
    String axis "Y";
    String ioos_category "Location";
    String long_name "Latitude";
    String name "latitude";
    String standard_name "latitude";
    String units "degrees_north";
  }
 }
  NC_GLOBAL {
    String acknowledgement 
"Fisheries & Oceans Canada,
Vancouver Fraser Port Authority (VFPA)";
    String cdm_data_type "TimeSeries";
    String cdm_timeseries_variables "speed, direction";
    String Conventions "CF-1.6, COARDS, ACDD-1.3";
    String creator_email "sallen@eos.ubc.ca";
    String creator_name "SalishSeaCast Project Contributors";
    String creator_url "https://salishsea-meopar-docs.readthedocs.io/";
    String drawLandMask "over";
    Float64 Easternmost_Easting -123.0247222;
    String featureType "TimeSeries";
    Float64 geospatial_lat_max 49.2938889;
    Float64 geospatial_lat_min 49.2938889;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -123.0247222;
    Float64 geospatial_lon_min -123.0247222;
    String geospatial_lon_units "degrees_east";
    String history 
"2024-11-21T12:09:13Z (local files)
2024-11-21T12:09:13Z https://salishsea.eos.ubc.ca/erddap/tabledap/ubcVFPA2ndNarrowsCurrent2sV1.html";
    String infoUrl "https://salishsea.eos.ubc.ca/";
    String institution "UCB EOAS, DFO IOS & VFPA";
    String institution_fullname 
"Earth, Ocean & Atmospheric Sciences, University of British Columbia,
    Fisheries and Oceans Canada - Institute of Ocean Sciences,
    Vancouver Fraser Port Authority";
    String keywords "2nd Narrows Rail Bridge, ADCP, circulation, current, currents, DFO IOS, direction, Earth Science > Oceans > Ocean Circulation > Ocean Currents, latitude, longitude, ocean, oceans, sea, sea_water_direction, sea_water_speed, seawater, speed, time, UBC EOAS, Vancouver Fraser Port Authority, Vancouver Harbour, velocity";
    String keywords_vocabulary "GCMD Science Keywords";
    String license 
"The SalishSeaCast observation datasets are copyright
by the SalishSeaCast Project Contributors, The University of British Columbia, and Ocean Networks Canada.

They are licensed under the Apache License, Version 2.0. https://www.apache.org/licenses/LICENSE-2.0

Raw instrument data on which this dataset is based were provided by the Vancouver Fraser Port Authority.";
    Float64 Northernmost_Northing 49.2938889;
    String source "Hourly AIS email feed created by DFO IOS.";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 49.2938889;
    String standard_name_vocabulary "CF Standard Name Table v29";
    String summary 
"VFPA, Vancouver Harbour, 2nd Narrows Rail Bridge, Current, 2sec, v1

Current data from Vancouver Fraser Port Authority (VFPA) horizontal acoustic doppler current profiler (HADCP) instrument located at the 2nd Narrows Rail Bridge. The time values are UTC.

v1: current speed and direction variables";
    String testOutOfDate "now-2days";
    String time_coverage_end "2024-11-20T23:58:00Z";
    String time_coverage_start "2017-11-21T00:00:00Z";
    String title "VFPA, Vancouver Harbour, 2nd Narrows Rail Bridge, Current, 2sec, v1";
    Float64 Westernmost_Easting -123.0247222;
  }
}

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.