Make A Graph

Dataset Title:	EMODnet Physics - Total Suspended Matter - GridSeriesObservation - Concentration of total suspended matter - PO
Institution:	CNR-GOS (Dataset ID: TSM_PO)
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

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

)

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 1.4832288e+9, 1.6724448e+9;
    String axis "T";
    String calendar "Gregorian";
    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";
    Float32 actual_range 44.50186, 45.79872;
    String axis "Y";
    String ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
    Float32 valid_max 46.0;
    Float32 valid_min 30.0;
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float32 actual_range 12.00147, 13.81859;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
    Float32 valid_max 36.5;
    Float32 valid_min -6.0;
  }
  conc_tsm_mean {
    Float32 _FillValue -999.0;
    String applied_flags "(WATER, INLAND_WATER) and not (CLOUD, CLOUD_AMBIGUOUS, CLOUD_MARGIN, INVALID, COSMETIC, SATURATED, SUSPECT, HISOLZEN, HIGHGLINT, SNOW_ICE, ADJAC, OCNN_FAIL)";
    String band_name "OLCI band name TSM_NN";
    String long_name "conc_tsm_mean";
    String source "OLCI - Level2";
  }
  NC_GLOBAL {
    String area "med";
    String cdm_data_type "Grid";
    String cmems_production_unit "OC-CNR-ROMA-IT";
    String contact "technical@gos.artov.isac.cnr.it";
    String Conventions "CF-1.10, COARDS, ACDD-1.3";
    String creation_date "2023-01-08";
    String creation_time "09:23:43 UTC";
    String creator_email "technical@gos.artov.isac.cnr.it";
    String creator_name "TECHNICAL";
    String creator_type "institution";
    String distribution_statement "See CMEMS Data License";
    Float64 Easternmost_Easting 13.81859;
    Float64 geospatial_lat_max 45.79872;
    Float64 geospatial_lat_min 44.50186;
    Float64 geospatial_lat_resolution 0.0027017916666666713;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 13.81859;
    Float64 geospatial_lon_min 12.00147;
    Float64 geospatial_lon_resolution 0.0034285283018867943;
    String geospatial_lon_units "degrees_east";
    String grid_mapping "Equirectangular";
    String grid_resolution "0.3 km";
    String history 
"Sun Jan  8 15:00:01 2023: /usr/bin/ncks -O -d lon,12.0,13.82 -d lat,44.5,45.8 -v TSMNN /DataArchive/OC/OLCI/daily_3.01//2022/365/O2022365-tsmnn-med-fr.nc /store3/snapshot/data2/2022/365/O2022365-tsmnn-nas-fr.nc
2025-04-19T12:18:46Z (local files)
2025-04-19T12:18:46Z http://erddap.emodnet-physics.eu/griddap/TSM_PO.das";
    String infoUrl "https://emodnet.ec.europa.eu/en/physics";
    String institution "CNR-GOS";
    String keywords "cnr, cnr-gos, council, data, gos, local, national, research, source, time, tsmnn";
    String license "See CMEMS Data License";
    String mosaic "/home/gosuser/Processing/OC_PROC_EIS202211/s3olciProcessing/s3olcimosaic.py";
    String naming_authority "CMEMS";
    String NCO "netCDF Operators version 4.7.5 (Homepage = http://nco.sf.net, Code = https://github.com/nco/nco)";
    String netcdf_version "v4";
    String noQI "No climatatology data available for tsmnn variable";
    Float64 Northernmost_Northing 45.79872;
    String platform "Sentinel3A+B";
    String product_level "L3";
    String product_version "v02";
    String reproject "/home/gosuser/Processing/OC_PROC_EIS202211/s3olciProcessing/s3olciL2proc.py";
    String sensor "Ocean and Land Colour Instrument";
    String sensor_name "OLCIA+B";
    String site_name "MED";
    String software_name "GOS Processing chain";
    String source "surface observation";
    String source_files "Oa2022365-tsmnn-med-fr.nc, Ob2022365-tsmnn-med-fr.nc";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 44.50186;
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary "EMODnet Physics - Total Suspended Matter - GridSeriesObservation - Concentration of total suspended matter - PO";
    String time_coverage_end "2022-12-31T00:00:00Z";
    String time_coverage_start "2017-01-01T00:00:00Z";
    String timeliness "NT";
    String title "EMODnet Physics - Total Suspended Matter - GridSeriesObservation - Concentration of total suspended matter - PO";
    Float64 Westernmost_Easting 12.00147;
  }
}

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.