CalCOFI ERDDAP
Easier access to scientific data

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Make A Graph

Dataset Title:	CalCOFI Phytoplankton (Venrick)
Institution:	CalCOFI (Dataset ID: calcofi_phytoplankton)
Range:	longitude = -121.577225 to -118.570114°E, latitude = 32.296867 to 33.91421°N, time = 1970-01-01T02:41:49Z to 1970-01-01T05:21:37Z
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Subset \| Data Access Form \| Files

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Graph Type:

X Axis:

Y Axis:

Color:

Constraints

Optional
Constraint #1

Optional
Constraint #2

Server-side Functions

distinct()

Hover here to see a list of options. Click on an option to select it.

Graph Settings

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Draw land mask:

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(Please be patient. It may take a while to get the data.)

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Then set the File Type: (File Type information)
and

or view the URL:
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Click on the map to specify a new center point.

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[The graph you specified. Please be patient.]

Things You Can Do With Your Graphs

Well, you can do anything you want with your graphs, of course. But some things you might not have considered are:

Web page authors can embed a graph of the latest data in a web page using HTML <img> tags.
Anyone can use ERDDAPs Slide Sorter to build a personal web page that displays graphs with the latest data (or other images or HTML content), each in its own, draggable slide.

The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 9709.0, 19297.0;
    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";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float64 actual_range 32.29686733333333, 33.914212;
    String axis "Y";
    String ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float64 actual_range -121.57722533333333, -118.570115;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  region_key {
    String ioos_category "Identifier";
    String long_name "Region key";
  }
  cruise_key {
    String ioos_category "Identifier";
    String long_name "Cruise key";
  }
  season {
    String ioos_category "Time";
    String long_name "Season";
  }
  year {
    Int32 actual_range 1996, 2022;
    String ioos_category "Time";
    String long_name "Year";
  }
  month {
    Int32 actual_range 1, 11;
    String ioos_category "Time";
    String long_name "Month";
  }
  species_code {
    String ioos_category "Identifier";
    String long_name "Species code";
  }
  taxa {
    String ioos_category "Other";
    String long_name "Taxa";
  }
  species {
    String ioos_category "Other";
    String long_name "Species";
  }
  scientific_name_accepted {
    String ioos_category "Other";
    String long_name "Scientific name accepted";
  }
  aphia_id {
    Int32 actual_range 109462, 1778370;
    String ioos_category "Identifier";
    String long_name "Aphia id";
  }
  abundance_cells_per_l {
    Float64 actual_range -13.0, 107258.7;
    String ioos_category "Other";
    String long_name "Abundance cells per l";
  }
 }
  NC_GLOBAL {
    String cdm_data_type "Point";
    String Conventions "COARDS, CF-1.10, ACDD-1.3";
    String creator_name "CalCOFI";
    String creator_url "https://calcofi.org";
    Float64 Easternmost_Easting -118.570115;
    String featureType "Point";
    Float64 geospatial_lat_max 33.914212;
    Float64 geospatial_lat_min 32.29686733333333;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -118.570115;
    Float64 geospatial_lon_min -121.57722533333333;
    String geospatial_lon_units "degrees_east";
    String history 
"2026-06-15T16:45:16Z (local files)
2026-06-15T16:45:16Z http://localhost:8090/tabledap/calcofi_phytoplankton.das";
    String infoUrl "https://calcofi.org";
    String institution "CalCOFI";
    String license "CC-BY 4.0";
    Float64 Northernmost_Northing 33.914212;
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 32.29686733333333;
    String standard_name_vocabulary "CF Standard Name Table v79";
    String subsetVariables "cruise_key";
    String summary "Phytoplankton abundance (cells/L) by taxon, 1996-2022 (Venrick, EDI knb-lter-cce.254). Region-pooled: latitude/longitude are provisional region centroids.";
    String time_coverage_end "1970-01-01T05:21:37Z";
    String time_coverage_start "1970-01-01T02:41:49Z";
    String title "CalCOFI Phytoplankton (Venrick)";
    Float64 Westernmost_Easting -121.57722533333333;
  }
}

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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