CalCOFI ERDDAP
Easier access to scientific data

Brought to you by CalCOFI

Make A Graph

Dataset Title:	CalCOFI CTD Cast Files — full resolution (pre-thinning)
Institution:	CalCOFI (Dataset ID: calcofi_ctd-cast_full)
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Subset \| Data Access Form

To work correctly, this web page requires that JavaScript be enabled in your browser. Please:
1) Enable JavaScript in your browser:
      • Chrome: "Settings : Advanced : Privacy and security : Site Settings : JavaScript"
      • Firefox: (it should be always on!)"
      • Opera: "Settings : Websites : JavaScript"
      • Safari: "Safari : Preferences : Security : Enable JavaScript"
2) Reload this web page.

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

Marker Type:

Size:

Color:

Color Bar:

Continuity:

Scale:

Minimum:

Maximum:

N Sections:

Draw land mask:

Y Axis Minimum:

Maximum:

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

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

or view the URL:
(Documentation / Bypass this form

)

Click on the map to specify a new center point.

Zoom:

Time range:

[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 {
  sample_key {
    String ioos_category "Identifier";
    String long_name "Sample key";
  }
  cruise_key {
    String ioos_category "Identifier";
    String long_name "Cruise key";
  }
  grid_key {
    String ioos_category "Identifier";
    String long_name "Grid key";
  }
  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";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    String axis "Y";
    String ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  depth {
    String _CoordinateAxisType "Height";
    String _CoordinateZisPositive "down";
    String axis "Z";
    String ioos_category "Location";
    String long_name "Depth";
    String positive "down";
    String standard_name "depth";
    String units "m";
  }
  measurement_type {
    String ioos_category "Other";
    String long_name "Measurement type";
  }
  measurement_value {
    String ioos_category "Other";
    String long_name "Measurement value";
  }
  measurement_qual {
    String ioos_category "Other";
    String long_name "Measurement qual";
  }
 }
  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";
    String dataset_key "calcofi_ctd-cast";
    String db_release "v2026.08.08";
    String featureType "Point";
    String geospatial_lat_units "degrees_north";
    String geospatial_lon_units "degrees_east";
    String geospatial_vertical_positive "down";
    String geospatial_vertical_units "m";
    String history 
"2026-08-11T05:51:11Z (source database)
2026-08-11T05:51:11Z http://localhost:8090/tabledap/calcofi_ctd-cast_full.das";
    String infoUrl "https://calcofi.org/data/oceanographic-data/ctd-cast-files/";
    String institution "CalCOFI";
    String license "CC-BY 4.0";
    String references "https://calcofi.io/workflows/publish_to-erddap.html";
    String sourceUrl "(source database)";
    String standard_name_vocabulary "CF Standard Name Table v79";
    String subsetVariables "cruise_key, measurement_type";
    String summary "CTD downcast profiles with temperature, salinity, oxygen, fluorescence, and other sensors at standard depths. 1 m-binned final data for 1993-2002 come from the SIO-CalCOFI Technical Group's own archive (J. Wilkinson), which covers the decade calcofi.org does not publish finals for; 1998 and 2003 onward come from calcofi.org. Where both publish the same cruise, calcofi.org is used; the two agree on 130 of 140 comparable files, and the four cruises that differ are recorded in question calcofi_ctd-cast_20. The full series before adaptive thinning. Much larger than the headline table and provided for scan-level work; most analyses want the thinned table. Source: CalCOFI integrated database release v2026.08.08. Citation: CalCOFI. (2023). CalCOFI CTD Cast Files. CalCOFI.org..";
    String title "CalCOFI CTD Cast Files — full resolution (pre-thinning)";
  }
}

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.

ERDDAP, Version 2.30.0
Disclaimers | Privacy Policy | Contact