BCO-DMO ERDDAP
Accessing BCO-DMO data

Data Access Form

Dataset Title:	[Chesapeake Bay Nutrients 2021] - Nutrients from CTD casts conducted on R/V Hugh R. Sharp cruise HRS2110 in the Chesapeake Bay during August 2021 (Nitrite Oxidation in Oxygen Minimum Zones)
Institution:	BCO-DMO (Dataset ID: bcodmo_dataset_896158_v1)
Information:	Summary \| License \| Metadata \| Background \| Files \| Make a graph

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Variable	Minimum	Maximum
Cast (unitless)	2	19
Station (unitless)	"CB1.25"	"CB3"
Date (unitless)	"2021-08-04"	"2021-08-10"
Latitude (decimal degrees)	37.27022	39.13996
Longitude (decimal degrees)	-76.43984	-76.09256
Depth (meters (m))	3.92	27.4
NH4 (micromolar (uM))	0.0	10.803
NH4_stdev (micromolar (uM))	0.005	0.698
NO2 (micromolar (uM))	0.0	4.68
NO2_stdev (micromolar (uM))	0.0	1.237
NO3 (micromolar (uM))	0.0	2.115
NO3_stdev (micromolar (uM))	0.0	0.851
Urea (micromolar (uM))	0.115	0.559
Urea_stdv (micromolar (uM))	0.0	0.138

Server-side Functions

distinct()

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File type: (more information)

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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  Cast {
    Int32 actual_range 2, 19;
    String long_name "Cast";
    String units "unitless";
  }
  Station {
    String long_name "Station";
    String units "unitless";
  }
  Date {
    String long_name "Date";
    String units "unitless";
  }
  Latitude {
    Float32 actual_range 37.27022, 39.13996;
    String long_name "Latitude";
    String units "decimal degrees";
  }
  Longitude {
    Float32 actual_range -76.43984, -76.09256;
    String long_name "Longitude";
    String units "decimal degrees";
  }
  Depth {
    Float32 actual_range 3.92, 27.4;
    String long_name "Depth";
    String units "meters (m)";
  }
  NH4 {
    Float32 actual_range 0.0, 10.803;
    String long_name "Nh4";
    String units "micromolar (uM)";
  }
  NH4_stdev {
    Float32 actual_range 0.005, 0.698;
    String long_name "Nh4_stdev";
    String units "micromolar (uM)";
  }
  NO2 {
    Float32 actual_range 0.0, 4.68;
    String long_name "No2";
    String units "micromolar (uM)";
  }
  NO2_stdev {
    Float32 actual_range 0.0, 1.237;
    String long_name "No2_stdev";
    String units "micromolar (uM)";
  }
  NO3 {
    Float32 actual_range 0.0, 2.115;
    String long_name "No3";
    String units "micromolar (uM)";
  }
  NO3_stdev {
    Float32 actual_range 0.0, 0.851;
    String long_name "No3_stdev";
    String units "micromolar (uM)";
  }
  Urea {
    Float32 actual_range 0.115, 0.559;
    String long_name "Urea";
    String units "micromolar (uM)";
  }
  Urea_stdv {
    Float32 actual_range 0.0, 0.138;
    String long_name "Urea_stdv";
    String units "micromolar (uM)";
  }
 }
  NC_GLOBAL {
    String cdm_data_type "Other";
    String Conventions "COARDS, CF-1.6, ACDD-1.3";
    String creator_email "info@bco-dmo.org";
    String creator_name "BCO-DMO";
    String creator_url "https://www.bco-dmo.org/";
    String doi "10.26008/1912/bco-dmo.896158.1";
    String history 
"2024-11-08T05:40:56Z (local files)
2024-11-08T05:40:56Z https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_896158_v1.html";
    String infoUrl "https://www.bco-dmo.org/dataset/896158";
    String institution "BCO-DMO";
    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 summary "This dataset includes nutrient data from R/V Hugh R. Sharp cruise HRS2110 in the Chesapeake Bay during August 2021.";
    String title "[Chesapeake Bay Nutrients 2021] - Nutrients from CTD casts conducted on R/V Hugh R. Sharp cruise HRS2110 in the Chesapeake Bay during August 2021 (Nitrite Oxidation in Oxygen Minimum Zones)";
  }
}

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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