Data Access Form

Dataset Title:	Newport Hydrographic Line Nitrate, NH25
Institution:	NOAA NWFSC (Dataset ID: newportNitrate)
Information:	Summary \| License \| Metadata \| Background \| Files \| Make a graph

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Variable	Minimum	Maximum
time (UTC)	2004-11-07T00:00:00Z	2017-07-12T00:00:00Z

station
depth (m)	150	150

nitrate (Nitrate (no3+no2))	4.5802	36.2214

Server-side Functions

distinct()

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File type: (more information)

(Documentation / Bypass this form )

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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.0997856e+9, 1.4998176e+9;
    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";
  }
  station {
    String ioos_category "Identifier";
    String long_name "Station";
  }
  depth {
    String _CoordinateAxisType "Height";
    String _CoordinateZisPositive "down";
    Int32 _FillValue 2147483647;
    Int32 actual_range 150, 150;
    String axis "Z";
    String ioos_category "Location";
    String long_name "Depth";
    String positive "down";
    String standard_name "depth";
    String units "m";
  }
  nitrate {
    Float32 actual_range 4.5802, 36.2214;
    String ioos_category "Other";
    String long_name "Nitrate (no3+no2)";
  }
 }
  NC_GLOBAL {
    String cdm_data_type "Other";
    String Conventions "CF-1.6, ACDD-1.3, COARDS, NCCSV-1.2";
    String defaultGraphQuery "time,nitrate&station=\"NH25\"&.draw=markers";
    Float64 geospatial_vertical_max 150.0;
    Float64 geospatial_vertical_min 150.0;
    String geospatial_vertical_positive "down";
    String geospatial_vertical_units "m";
    String history 
"2025-03-26T09:47:40Z (local files)
2025-03-26T09:47:40Z http://upwell.pfeg.noaa.gov/erddap/tabledap/newportNitrate.html";
    String infoUrl "https://www.noaa.gov/iea/CCIEA-Report/drivers/drivers/environmental.html";
    String institution "NOAA NWFSC";
    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 "(local files)";
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary "Newport Hydrographic Line Nitrate, NH25";
    String time_coverage_end "2017-07-12T00:00:00Z";
    String time_coverage_start "2004-11-07T00:00:00Z";
    String title "Newport Hydrographic Line Nitrate, NH25";
  }
}

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://upwell.pfeg.noaa.gov/erddap/tabledap/datasetID.fileType{?query}
For example,
https://upwell.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.