Make A Graph

Dataset Title:	Wavy measurements from 00WO31 starting 2021-10-29T11:15:00
Institution:	Universitat Politècnica de Catalunya, WAVY (Dataset ID: MELOA_00wo31)
Range:	longitude = -21.3843 to -17.8803°E, latitude = 27.8697 to 29.3651°N, time = 2021-10-28T08:22:00.000Z to 2021-12-23T04:35:00.000Z
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Data Access Form \| Files

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Constraints	Optional Constraint #1		Optional Constraint #2

Server-side Functions

distinct()

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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 {
 s {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.63540932e+9, 1.6402341e+9;
    String axis "T";
    String ioos_category "Time";
    String long_name "Timestamp";
    String source_name "timestamp";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String time_precision "1970-01-01T00:00:00.000Z";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  record {
    Byte _FillValue 127;
    String _Unsigned "false";
    Byte actual_range 0, 0;
    String long_name "Record";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float32 actual_range 27.8697, 29.3651;
    String axis "Y";
    String ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float32 actual_range -21.3843, -17.8803;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  height {
    String long_name "Height";
  }
  speed {
    String long_name "Speed";
  }
  course {
    String long_name "Course";
  }
  nb_gnss_sat {
    Byte _FillValue 127;
    String _Unsigned "false";
    Byte actual_range 6, 20;
    String long_name "Nb Gnss Sat";
  }
  validity {
    String long_name "Validity";
  }
  hdop {
    String long_name "Hdop";
  }
  vdop {
    String long_name "Vdop";
  }
  pdop {
    String long_name "Pdop";
  }
  sep {
    String long_name "Sep";
  }
  temp_1 {
    Float32 _FillValue NaN;
    Float32 actual_range 19.0, 24.6;
    String long_name "Sea Surface Temperature 1 (12 - 15 cm depth)";
    String sensor "Thermistor temperature 1";
    String units "degree_C";
  }
  temp_2 {
    Float32 _FillValue NaN;
    String long_name "Sea Surface Temperature 2 (3 - 5 cm depth)";
    String sensor "Thermistor temperature 2";
    String units "degree_C";
  }
  temp_3 {
    Float32 _FillValue NaN;
    Float32 actual_range 11.1, 11.1;
    String long_name "Near Sea Surface Air temperature";
    String sensor "Thermistor temperature 4";
    String units "degree_C";
  }
  temp_4 {
    Float32 _FillValue NaN;
    Float32 actual_range 11.1, 11.1;
    String long_name "Air Temperature";
    String sensor "Thermistor temperature 3";
    String units "degree_C";
  }
  atm {
    Float32 _FillValue NaN;
    String long_name "Air Pressure";
    String sensor "Sensor Pressure";
    String units "Pa";
  }
  Hm0 {
    Float32 _FillValue NaN;
    Float32 actual_range 0.0, 18.0;
    String long_name "Significant Wave Height";
    String units "m";
  }
  Tm01 {
    Float32 _FillValue NaN;
    Float32 actual_range 0.0, 44.0;
    String long_name "Significant Wave Period (First momentum)";
    String units "s";
  }
  Tm02 {
    Float32 _FillValue NaN;
    Float32 actual_range 4.0, 11.0;
    String long_name "Significant Wave Period (Second momentum)";
    String units "s";
  }
  Tp {
    Float32 _FillValue NaN;
    Float32 actual_range 4.0, 14.0;
    String long_name "Peak Wave Period";
    String units "s";
  }
  Mdir {
    Float32 _FillValue NaN;
    Float32 actual_range 0.0, 360.0;
    String long_name "Mean Wave Direction";
    String units "degree";
  }
  PkDir {
    Float32 _FillValue NaN;
    Float32 actual_range 0.0, 360.0;
    String long_name "Peak Wave Direction";
    String units "degree";
  }
  DirSpr {
    Float32 _FillValue NaN;
    Float32 actual_range 36.0, 79.0;
    String long_name "Mean Wave Directional Spreading";
    String units "degree";
  }
  PkDirSpr {
    Float32 _FillValue NaN;
    Float32 actual_range 22.0, 78.0;
    String long_name "Peak Wave Directional Spreading";
    String units "degree";
  }
  WmaxH {
    Float32 _FillValue NaN;
    Float32 actual_range 0.0, 38.2;
    String long_name "Maximum Wave Height";
    String units "m";
  }
  bat {
    Float32 _FillValue NaN;
    Float32 actual_range 3.3, 4.0;
    String long_name "Bat";
  }
  year {
    Int16 _FillValue 32767;
    Int16 actual_range 2021, 2021;
    String long_name "Year";
  }
  month {
    Byte _FillValue 127;
    String _Unsigned "false";
    Byte actual_range 10, 12;
    String long_name "Month";
  }
  day {
    Byte _FillValue 127;
    String _Unsigned "false";
    Byte actual_range 1, 31;
    String long_name "Day";
  }
  hour {
    Byte _FillValue 127;
    String _Unsigned "false";
    Byte actual_range 0, 23;
    String long_name "Hour";
  }
  minute {
    Byte _FillValue 127;
    String _Unsigned "false";
    Byte actual_range 2, 55;
    String long_name "Minute";
  }
  second {
    Byte _FillValue 127;
    String _Unsigned "false";
    Byte actual_range 0, 10;
    String long_name "Second";
  }
  ref {
    String long_name "Ref";
  }
 }
  NC_GLOBAL {
    String campaignid "00064";
    String campaignname "La Palma";
    String cdm_data_type "Point";
    String checksum "df1db62fb8950f32819f0de8bbbab998";
    String contact_email "daniel.mihai.toma@upc.edu";
    String contact_institution "Universitat Politècnica de Catalunya";
    String contact_name "Daniel Toma";
    String Conventions "COARDS, CF-1.6, ACDD-1.3";
    Float64 Easternmost_Easting -17.8803;
    String featureType "Point";
    Float64 geospatial_lat_max 29.3651;
    Float64 geospatial_lat_min 27.8697;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -17.8803;
    Float64 geospatial_lon_min -21.3843;
    String geospatial_lon_units "degrees_east";
    String history 
"2025-11-04T14:39:59Z (local files)
2025-11-04T14:39:59Z http://erddap.emodnet-physics.eu/tabledap/MELOA_00wo31.das";
    String infoUrl "http://catalogue.ec-meloa.eu/dataset/wavydata_166";
    String institution "Universitat Politècnica de Catalunya, WAVY";
    String keywords "atm, bat, course, data, day, dir, DirSpr, gnss, hdop, height, hm0, hour, latitude, local, longitude, mdir, minute, month, nb_gnss_sat, pdop, PkDir, PkDirSpr, record, ref, sat, second, source, speed, spr, temp_1, temp_2, temp_3, temp_4, temperature, time, timestamp, tm01, tm02, validity, vdop, wmax, WmaxH, year";
    String license "Creative Commons Attribution Share-Alike http://www.opendefinition.org/licenses/cc-by-sa";
    String measurements_files "MELOA_TEST_00064_00WO31_20211029T111500_20211223T043500_13_127.csv";
    Float64 Northernmost_Northing 29.3651;
    String number_of_measurements "4428";
    String quality_check "No issues found";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 27.8697;
    String spatial "{\"type\": \"Polygon\", \"coordinates\": [[[-17.8803, 29.3651], [-21.3843, 29.3651], [-21.3843, 27.8697], [-17.8803, 27.8697], [-17.8803, 29.3651]]]}";
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary "Wavy measurements from 00WO31 starting 2021-10-29T11:15:00";
    String time_coverage_end "2021-12-23T04:35:00.000Z";
    String time_coverage_start "2021-10-28T08:22:00.000Z";
    String title "Wavy measurements from 00WO31 starting 2021-10-29T11:15:00";
    String wavyid "297";
    String wavyname "WAVY Ocean 31";
    String wavyserialnumber "00WO31";
    String wavytype "Ocean";
    Float64 Westernmost_Easting -21.3843;
  }
}

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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