Make A Graph

Dataset Title:	Ocean Heat Content, D26 and D20 Fields (UOHC), 0.25°, 2016-present
Institution:	USDOC/NOAA/NESDIS/OSPO (Dataset ID: noaa_aoml_6b09_4e6f_46dd)
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Data Access Form

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Graph Type:
X Axis:
Y Axis:
Color:

Dimensions

Start

Stop

time (UTC)

specify just 1 value →

latitude (degrees_north)

longitude (degrees_east)

Graph Settings
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

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Click on the map to specify a new center point.

Zoom:

[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 {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.3460688e+9, 1.7149968e+9;
    String axis "T";
    String calendar "Gregorian";
    String CoordinateAxisType "Time";
    String ioos_category "Time";
    String long_name "Reference 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 -90.0, 90.0;
    String axis "Y";
    String CoordinateAxisType "Lat";
    String ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float64 actual_range -180.0, 180.0;
    String axis "X";
    String CoordinateAxisType "Lon";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  Ocean_Heat_Content {
    Float32 _FillValue NaN;
    Float32 actual_range 0.0, 298.93;
    Float64 colorBarMaximum 300.0;
    Float64 colorBarMinimum 0.0;
    String coordsys "geographic";
    String ioos_category "Other";
    String long_name "Ocean Heat Content";
    String standard_name "integral_of_sea_water_potential_temperature_wrt_depth_expressed_as_heat_content";
    String units "KJcm-2";
    String variable_info "Ocean Heat Content";
  }
  D26 {
    Float32 _FillValue NaN;
    Float32 actual_range 0.316, 193.065;
    Float64 colorBarMaximum 200.0;
    Float64 colorBarMinimum 0.0;
    String coordsys "geographic";
    String ioos_category "Temperature";
    String long_name "D26";
    String standard_name "depth_of_isosurface_of_sea_water_potential_temperature";
    String units "m";
    String variable_info "Depth of the 26deg isotherm";
  }
  D20 {
    Float32 _FillValue NaN;
    Float32 actual_range 1.092, 305.176;
    Float64 colorBarMaximum 400.0;
    Float64 colorBarMinimum 0.0;
    String coordsys "geographic";
    String ioos_category "Temperature";
    String long_name "D20";
    String standard_name "depth_of_isosurface_of_sea_water_potential_temperature";
    String units "m";
    String variable_info "Depth of the 20deg isotherm";
  }
  NC_GLOBAL {
    String cdm_data_type "Grid";
    String comment 
"NOAA OSPO Ocean Heat Content
https://www.ospo.noaa.gov/Products/ocean/ocean_heat.html.";
    String contact "Joaquin.Trinanes@noaa.gov";
    String Conventions "COARDS, CF-1.6, ACDD-1.3";
    String creator_email "Joaquin.Trinanes@noaa.gov";
    String creator_name "USDOC/NOAA/NESDIS/OSPO";
    String creator_type "institution";
    String creator_url "https://www.aoml.noaa.gov/phod/";
    String data_source "USDOC/NOAA/NESDIS/OSPO";
    Float64 Easternmost_Easting 180.0;
    Float64 geospatial_lat_max 90.0;
    Float64 geospatial_lat_min -90.0;
    Float64 geospatial_lat_resolution 0.25;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 180.0;
    Float64 geospatial_lon_min -180.0;
    Float64 geospatial_lon_resolution 0.25;
    String geospatial_lon_units "degrees_east";
    String history 
"2024-05-06T13:58:40Z https://cwcgom.aoml.noaa.gov/thredds/dodsC/UOHC/UOHC.nc
2024-05-06T13:58:40Z http://upwell.pfeg.noaa.gov/griddap/noaa_aoml_6b09_4e6f_46dd.das";
    String id "UOHC";
    String infoUrl "https://cwcgom.aoml.noaa.gov/thredds/dodsC/UOHC/UOHC.nc.html";
    String institution "USDOC/NOAA/NESDIS/OSPO";
    String keywords "altimeter, commerce, common, conservation, content, d20, d26, data, department, depth, depth_of_isosurface_of_sea_water_potential_temperature, earth, Earth Science > Oceans > Ocean Temperature > Potential Temperature, Earth Science > Oceans > Ocean Temperature > Water Temperature, environmental, expressed, fields, format, habitat, heat, heat content, height, hurricane, hurricane intensification, information, integral, integral_of_sea_water_potential_temperature_wrt_depth_expressed_as_heat_content, isosurface, latitude, longitude, national, nesdis, network, nmfs, noaa, ocean, Ocean_Heat_Content, oceans, office, ohc, operations, osdpd, ospo, potential, product, satellite, science, sea, seawater, service, ssh, sst, states, surface, temperature, time, united, uohc, usdoc, water, wrt";
    String keywords_vocabulary "GCMD Science Keywords";
    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 Contri
butor, 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.";
    Float64 Northernmost_Northing 90.0;
    String origin "USDOC/NOAA/NESDIS/OSPO";
    String source_data "Altimeter SHA+GOES/POES Blended SST";
    String sourceUrl "https://cwcgom.aoml.noaa.gov/thredds/dodsC/UOHC/UOHC.nc";
    Float64 Southernmost_Northing -90.0;
    String spatial_resolution "0.25 degree";
    String standard_name_vocabulary "CF Standard Name Table v32";
    String summary "Ocean Heat Content, D26 and D20 Fields. The Satellite Ocean Heat Content (Office of Habitat Conservation (OHC)) Suite system produces two OHC files in ASCII and Network Common Data Format (NetCDF) where the output is defined on a 0.25 degree grid. For the daily files, the fields are: latitude, longitude, sea surface temperature (SST) in °C, sea surface height anomaly (SSHA) in cm, mapping error, depths of 20°C (D20) and 26°C (D26) isotherms, ocean mixed layer depth (MLD), all in meters, and a satellite derived ocean heat content (OHC) in kJ/cm2. Maintenance level is 8x7, since it runs once daily during normal working hours. Return to service should be as soon as possible. The requirements were for ASCII and NetCDF output files, as well as GIF images. The files were to contain latitude, longitude, sea surface height anomaly, OA mapping error, sea surface temperature, depth of the 20°C isotherm, depth of the 26°C isotherm, mixed layer depth, and ocean heat content. OHC is mapped at 0.25 degree resolution with an accuracy within 10 to 15% of in situ data and a latency of 36 hours. The latency of 36 hours is due to the receipt/processing required for the Sea Surface Height Anomaly data. Five GIF images were also to be created each day for OHC, SST, 20 degree isotherm, 26 degree isotherm, and Mixed Layer Depth.";
    Float64 temporal_extent 86400.0;
    String temporal_extent_unit "seconds";
    String testOutOfDate "now-1day";
    String time_coverage_end "2024-05-06T12:00:00Z";
    String time_coverage_start "2012-08-27T12:00:00Z";
    String title "Ocean Heat Content, D26 and D20 Fields (UOHC), 0.25°, 2016-present";
    Float64 Westernmost_Easting -180.0;
  }
}

Using griddap to Request Data and Graphs from Gridded Datasets

griddap lets you request a data subset, graph, or map from a gridded dataset (for example, sea surface temperature data from a satellite), via a specially formed URL. griddap uses the OPeNDAP (external link)

Data Access Protocol (DAP) (external link)

and its projection 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. It makes 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.

griddap request URLs must be in the form
https://upwell.pfeg.noaa.gov/erddap/griddap/datasetID.fileType{?query}
For example,
https://upwell.pfeg.noaa.gov/erddap/griddap/jplMURSST41.htmlTable?analysed_sst[(2002-06-01T09:00:00Z)][(-89.99):1000:(89.99)][(-179.99):1000:(180.0)]
Thus, the query is often a data variable name (e.g., analysed_sst), followed by [(start):stride:(stop)] (or a shorter variation of that) for each of the variable's dimensions (for example, [time][latitude][longitude]).

For details, see the griddap Documentation.