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Dataset Title:	Density of in-situ measurements of Water Salinity from platforms available in EMODnet- Physics - Global, 0.1°x0.1°, Monthly
Institution:	ETT S.p.A. (Dataset ID: DENSITY_WATERSALINITY_test)
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Data Access Form \| Files

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Graph Type:
X Axis:
Y Axis:
Color:

Dimensions

Start

Stop

depth (m)

specify just 1 value →

time (UTC)

specify just 1 value →

latitude (degrees_north)

longitude (degrees_east)

Graph Settings
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Minimum:	Maximum:	N Sections:
Draw land mask:
Y Axis Minimum:	Maximum:

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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 {
  depth {
    String _CoordinateAxisType "Height";
    String _CoordinateZisPositive "down";
    UInt16 actual_range 0, 2500;
    String axis "Z";
    String ioos_category "Location";
    String long_name "Depth";
    String positive "down";
    String standard_name "depth";
    String units "m";
  }
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.6409952e+9, 1.738368e+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";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float64 actual_range -89.94999999998977, 89.95;
    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 -179.95, 179.94999999997953;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  DENSITY {
    Byte _FillValue -1;
    String _Unsigned "true";
    Float64 colorBarMaximum 100.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Unknown";
    String long_name "Number of days with measurements";
    String units "days";
    Byte valid_max 31;
    Byte valid_min 0;
  }
  In_situ_thematic_centre {
    Byte _FillValue -1;
    String _Unsigned "true";
    Float64 colorBarMaximum 40.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Unknown";
    String long_name "Data from source in situ thematic centre";
    String units "source";
    Byte valid_max 31;
    Byte valid_min 0;
  }
  Pangaea {
    Byte _FillValue -1;
    String _Unsigned "true";
    Float64 colorBarMaximum 40.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Unknown";
    String long_name "Data from source pangaea";
    String units "source";
    Byte valid_max 31;
    Byte valid_min 0;
  }
  Argo {
    Byte _FillValue -1;
    String _Unsigned "true";
    Float64 colorBarMaximum 40.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Unknown";
    String long_name "Data from source argo";
    String units "source";
    Byte valid_max 31;
    Byte valid_min 0;
  }
  Icesctd {
    Byte _FillValue -1;
    String _Unsigned "true";
    Float64 colorBarMaximum 40.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Unknown";
    String long_name "Data from source icesctd";
    String units "source";
    Byte valid_max 31;
    Byte valid_min 0;
  }
  Meop {
    Byte _FillValue -1;
    String _Unsigned "true";
    Float64 colorBarMaximum 40.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Unknown";
    String long_name "Data from source meop";
    String units "source";
    Byte valid_max 31;
    Byte valid_min 0;
  }
  Ioos {
    Byte _FillValue -1;
    String _Unsigned "true";
    Float64 colorBarMaximum 40.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Unknown";
    String long_name "Data from source ioos";
    String units "source";
    Byte valid_max 31;
    Byte valid_min 0;
  }
  Other {
    Byte _FillValue -1;
    String _Unsigned "true";
    Float64 colorBarMaximum 40.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Unknown";
    String long_name "Data from source other";
    String units "source";
    Byte valid_max 31;
    Byte valid_min 0;
  }
  QC_0 {
    Byte _FillValue -1;
    String _Unsigned "true";
    Float64 colorBarMaximum 150.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Unknown";
    String long_name "Data with QC value 0";
    String units "QC value";
    Byte valid_max 31;
    Byte valid_min 0;
  }
  QC_1 {
    Byte _FillValue -1;
    String _Unsigned "true";
    Float64 colorBarMaximum 150.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Unknown";
    String long_name "Data with QC value 1";
    String units "QC value";
    Byte valid_max 31;
    Byte valid_min 0;
  }
  QC_2 {
    Byte _FillValue -1;
    String _Unsigned "true";
    Float64 colorBarMaximum 150.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Unknown";
    String long_name "Data with QC value 2";
    String units "QC value";
    Byte valid_max 31;
    Byte valid_min 0;
  }
  QC_3 {
    Byte _FillValue -1;
    String _Unsigned "true";
    Float64 colorBarMaximum 150.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Unknown";
    String long_name "Data with QC value 3";
    String units "QC value";
    Byte valid_max 31;
    Byte valid_min 0;
  }
  QC_4 {
    Byte _FillValue -1;
    String _Unsigned "true";
    Float64 colorBarMaximum 150.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Unknown";
    String long_name "Data with QC value 4";
    String units "QC value";
    Byte valid_max 31;
    Byte valid_min 0;
  }
  QC_9 {
    Byte _FillValue -1;
    String _Unsigned "true";
    Float64 colorBarMaximum 150.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Unknown";
    String long_name "Data with QC value 9";
    String units "QC value";
    Byte valid_max 31;
    Byte valid_min 0;
  }
  CNDC {
    Byte _FillValue -1;
    String _Unsigned "true";
    Float64 colorBarMaximum 40.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Unknown";
    String long_name "CNDCZZ01";
    String units "P01";
    Byte valid_max 31;
    Byte valid_min 0;
  }
  DENS {
    Byte _FillValue -1;
    String _Unsigned "true";
    Float64 colorBarMaximum 40.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Unknown";
    String long_name "SIGTEQ01";
    String units "P01";
    Byte valid_max 31;
    Byte valid_min 0;
  }
  SVEL {
    Byte _FillValue -1;
    String _Unsigned "true";
    Float64 colorBarMaximum 40.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Unknown";
    String long_name "SVELXXXX";
    String units "P01";
    Byte valid_max 31;
    Byte valid_min 0;
  }
  TEMP_DOXY {
    Byte _FillValue -1;
    String _Unsigned "true";
    Float64 colorBarMaximum 40.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Unknown";
    String long_name "OXYTAAOP";
    String units "P01";
    Byte valid_max 31;
    Byte valid_min 0;
  }
  ASAL {
    Byte _FillValue -1;
    String _Unsigned "true";
    Float64 colorBarMaximum 40.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Unknown";
    String long_name "PSAL";
    String units "P01";
    Byte valid_max 31;
    Byte valid_min 0;
  }
  PSAL {
    Byte _FillValue -1;
    String _Unsigned "true";
    Float64 colorBarMaximum 40.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Unknown";
    String long_name "PSLTZZ01";
    String units "P01";
    Byte valid_max 31;
    Byte valid_min 0;
  }
  SIGMA_THETA {
    Byte _FillValue -1;
    String _Unsigned "true";
    Float64 colorBarMaximum 40.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Unknown";
    String long_name "SIGTPR01";
    String standard_name "sea_water_sigma_theta";
    String units "P01";
    Byte valid_max 31;
    Byte valid_min 0;
  }
  NC_GLOBAL {
    String cdm_data_type "Grid";
    String Conventions "COARDS, CF-1.10, ACDD-1.3";
    Float64 Easternmost_Easting 179.94999999997953;
    Float64 geospatial_lat_max 89.95;
    Float64 geospatial_lat_min -89.94999999998977;
    Float64 geospatial_lat_resolution 0.09999999999999432;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 179.94999999997953;
    Float64 geospatial_lon_min -179.95;
    Float64 geospatial_lon_resolution 0.0999999999999943;
    String geospatial_lon_units "degrees_east";
    String history 
"2025-10-13T17:18:39Z (local files)
2025-10-13T17:18:39Z http://erddap.s4oceandata.eu/griddap/DENSITY_WATERSALINITY_test.das";
    String infoUrl "https://emodnet.ec.europa.eu/en/physics";
    String institution "ETT S.p.A.";
    String keywords "argo, array, ASAL, centre, CNDC, cndczz01, data, days, DENS, Density, density, depth, earth, Earth Science, geostrophic, icesctd, In_situ_thematic_centre, integrated, ioos, latitude, local, longitude, measurements, meop, number, observing, Ocean, ocean, oceanography, oceans, Other, oxytaaop, pangaea, psal, psltzz01, QC_0, QC_1, QC_2, QC_3, QC_4, QC_9, real, real time, real-time, realtime, salinity, Salinity/Density, science, sea, sea_water_sigma_theta, seawater, sigma, SIGMA_THETA, sigteq01, sigtpr01, situ, source, SVEL, svelxxxx, system, TEMP_DOXY, thematic, theta, time, value, water, with";
    String keywords_vocabulary "GCMD Science Keywords";
    String license "CC-BY";
    Float64 Northernmost_Northing 89.95;
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing -89.94999999998977;
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary "The dataset provides monthly density maps of water salinity measurements aggregated into a spatial grid with a resolution of 0.1° x 0.1°. Each grid cell contains the total number of days in the month on which salinity measurements were recorded, with values ranging from 0 (no data) to the number of days in the month. The data comes from EMODnet Physics, which integrates in situ observations from different platforms. The dataset highlights the temporal availability of salinity data at different locations.";
    String testOutOfDate "now-109days";
    String time_coverage_end "2025-02-01T00:00:00Z";
    String time_coverage_start "2022-01-01T00:00:00Z";
    String title 
"Density of in-situ measurements of Water Salinity from platforms available in EMODnet-
Physics - Global, 0.1°x0.1°, Monthly";
    Float64 Westernmost_Easting -179.95;
  }
}

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