Make A Graph

Dataset Title:	Example 01: Simple dataset with only one CTD at a fixed depth
Institution:	UPC - Universitat Politècnica de Catalunya (Dataset ID: example02)
Range:	longitude = 1.75257 to 1.75257°E, latitude = 41.18212 to 41.18212°N, depth = 0.8043524 to 150.33092m, time = 2024-01-01T00:00:00Z to 2024-01-02T00:00:00Z
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Subset \| Data Access Form \| Files

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Graph Type:

X Axis:

Y Axis:

Color:

Constraints

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Constraint #1

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Constraint #2

Server-side Functions

distinct()

Hover here to see a list of options. Click on an option to select it.

Graph Settings

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Color Bar:

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N Sections:

Draw land mask:

Y Axis Minimum:

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Click on the map to specify a new center point.

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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 {
    UInt32 _ChunkSizes 49;
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.7040672e+9, 1.7041536e+9;
    String axis "T";
    String ioos_category "Time";
    String long_name "time of measurements";
    String monotonic "increasing";
    String sdn_parameter_name "Elapsed time relative to 1970-01-01T00:00:00Z";
    String sdn_parameter_uri "https://vocab.nerc.ac.uk/collection/P01/current/ELTMEP01/";
    String sdn_parameter_urn "SDN:P01::ELTMEP01";
    String sdn_uom_name "Seconds";
    String sdn_uom_uri "https://vocab.nerc.ac.uk/collection/P06/current/UTBB/";
    String sdn_uom_urn "SDN:P06::UTBB";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String units "seconds since 1970-01-01T00:00:00Z";
    String variable_type "coordinate";
  }
  depth {
    UInt32 _ChunkSizes 49;
    String _CoordinateAxisType "Height";
    String _CoordinateZisPositive "down";
    Float64 _FillValue -9999.99;
    Float64 actual_range 0.8043524, 150.3309186;
    String axis "Z";
    String ioos_category "Location";
    String long_name "depth of measurements";
    String positive "down";
    String sdn_parameter_name "Depth (spatial coordinate) relative to water surface in the water body";
    String sdn_parameter_uri "https://vocab.nerc.ac.uk/collection/P01/current/ADEPZZ01";
    String sdn_parameter_urn "SDN:P01::ADEPZZ01";
    String sdn_uom_name "Metres";
    String sdn_uom_uri "https://vocab.nerc.ac.uk/collection/P06/current/ULAA/";
    String sdn_uom_urn "SDN:P06::ULAA";
    String standard_name "depth";
    String units "m";
    String variable_type "coordinate";
  }
  latitude {
    UInt32 _ChunkSizes 49;
    String _CoordinateAxisType "Lat";
    Float64 _FillValue -9999.99;
    Float64 actual_range 41.18212, 41.18212;
    String axis "Y";
    String ioos_category "Location";
    String long_name "latitude of measurements";
    String sdn_parameter_name "Latitude north";
    String sdn_parameter_uri "https://vocab.nerc.ac.uk/collection/P01/current/ALATZZ01";
    String sdn_parameter_urn "SDN:P01::ALATZZ01";
    String sdn_uom_name "Degrees";
    String sdn_uom_uri "https://vocab.nerc.ac.uk/collection/P06/current/UAAA/";
    String sdn_uom_urn "SDN:P06::UAAA";
    String standard_name "latitude";
    String units "degrees_north";
    String variable_type "coordinate";
  }
  longitude {
    UInt32 _ChunkSizes 49;
    String _CoordinateAxisType "Lon";
    Float64 _FillValue -9999.99;
    Float64 actual_range 1.75257, 1.75257;
    String axis "X";
    String ioos_category "Location";
    String long_name "longitude of measurements";
    String sdn_parameter_name "Longitude east";
    String sdn_parameter_uri "https://vocab.nerc.ac.uk/collection/P01/current/ALONZZ01";
    String sdn_parameter_urn "SDN:P01::ALONZZ01";
    String sdn_uom_name "Degrees";
    String sdn_uom_uri "https://vocab.nerc.ac.uk/collection/P06/current/UAAA/";
    String sdn_uom_urn "SDN:P06::UAAA";
    String standard_name "longitude";
    String units "degrees_east";
    String variable_type "coordinate";
  }
  sensor_id {
    String long_name "Identifier of the sensor that took the measurement";
    String sdn_parameter_name "Name of sampling instrument";
    String sdn_parameter_uri "https://vocab.nerc.ac.uk/collection/P01/current/NMSPINST/";
    String sdn_parameter_urn "SDN:P01::NMSPINST";
    String variable_type "coordinate";
  }
  platform_id {
    String cf_role "timeseries_id";
    String long_name "Platform where the sensor was deployed";
    String sdn_parameter_name "Name of sampling platform";
    String sdn_parameter_uri "https://vocab.nerc.ac.uk/collection/P01/current/NMSPPF01/";
    String sdn_parameter_urn "SDN:P01::NMSPPF01";
    String standard_name "platform_id";
    String variable_type "coordinate";
  }
  TEMP {
    UInt32 _ChunkSizes 49;
    Float64 _FillValue -9999.99;
    Float64 actual_range 12.0041, 27.9959;
    String ancillary_variables "TEMP_QC";
    String coordinates "time latitude longitude depth sensor_id platform_id";
    String long_name "sea water temperature";
    String reference_scale "ITS-90";
    String sdn_parameter_name "Temperature of the water body by CTD or STD";
    String sdn_parameter_uri "https://vocab.nerc.ac.uk/collection/P01/current/TEMPST01";
    String sdn_parameter_urn "SDN:P01::TEMPST01";
    String sdn_uom_name "Degrees Celsius";
    String sdn_uom_uri "https://vocab.nerc.ac.uk/collection/P06/current/UPAA/";
    String sdn_uom_urn "SDN:P06::UPAA";
    String standard_name "sea_water_temperature";
    String units "degC";
    String variable_type "environmental";
  }
  CNDC {
    UInt32 _ChunkSizes 49;
    Float64 _FillValue -9999.99;
    Float64 actual_range 4.0005, 5.9995;
    String ancillary_variables "CNDC_QC";
    String coordinates "time latitude longitude depth sensor_id platform_id";
    String long_name "sea water electrical conductivity";
    String sdn_parameter_name "Electrical conductivity of the water body by CTD";
    String sdn_parameter_uri "https://vocab.nerc.ac.uk/collection/P01/current/CNDCST01";
    String sdn_parameter_urn "SDN:P01::CNDCST01";
    String sdn_uom_name "Siemens per metre";
    String sdn_uom_uri "https://vocab.nerc.ac.uk/collection/P06/current/UECA/";
    String sdn_uom_urn "SDN:P06::UECA";
    String standard_name "sea_water_electrical_conductivity";
    String units "S/m";
    String variable_type "environmental";
  }
  PRES {
    UInt32 _ChunkSizes 49;
    Float64 _FillValue -9999.99;
    Float64 actual_range 0.8109656, 151.5668923;
    String ancillary_variables "PRES_QC";
    String coordinates "time latitude longitude depth sensor_id platform_id";
    String long_name "sea water pressure";
    String sdn_parameter_name "Pressure (spatial coordinate) exerted by the water body by profiling pressure sensor and correction to read zero at sea level";
    String sdn_parameter_uri "https://vocab.nerc.ac.uk/collection/P01/current/PRESPR01";
    String sdn_parameter_urn "SDN:P01::PRESPR01";
    String sdn_uom_name "Decibars";
    String sdn_uom_uri "https://vocab.nerc.ac.uk/collection/P06/current/UPDB/";
    String sdn_uom_urn "SDN:P06::UPDB";
    String standard_name "sea_water_pressure";
    String units "dbar";
    String variable_type "environmental";
  }
  PSAL {
    UInt32 _ChunkSizes 49;
    Float64 _FillValue -9999.99;
    Float64 actual_range 34.001, 37.999;
    String ancillary_variables "PSAL_QC";
    String coordinates "time latitude longitude depth sensor_id platform_id";
    String long_name "sea water salinity";
    String sdn_parameter_name "Practical salinity of the water body by CTD and computation using UNESCO 1983 algorithm";
    String sdn_parameter_uri "https://vocab.nerc.ac.uk/collection/P01/current/PSALST01/";
    String sdn_parameter_urn "SDN:P01::PSALST01";
    String sdn_uom_name "Practical salinity units";
    String sdn_uom_uri "https://vocab.nerc.ac.uk/collection/P06/current/PSUX/";
    String sdn_uom_urn "SDN:P06::PSUX";
    String standard_name "sea_water_practical_salinity";
    String units "PSU";
    String variable_type "environmental";
  }
  TEMP_QC {
    UInt32 _ChunkSizes 49;
    Byte _FillValue -1;
    String _Unsigned "true";
    Byte actual_range 1, 1;
    String conventions "OceanSITES QC Flags";
    String flag_meanings "unknown good_data probably_good_data potentially_correctable_bad_data bad_data nominal_value interpolated_value missing_value";
    Byte flag_values 0, 1, 2, 3, 4, 7, 8, 9;
    String long_name "sea water temperature quality control flags";
    String variable_type "quality_control";
  }
  CNDC_QC {
    UInt32 _ChunkSizes 49;
    Byte _FillValue -1;
    String _Unsigned "true";
    Byte actual_range 1, 1;
    String conventions "OceanSITES QC Flags";
    String flag_meanings "unknown good_data probably_good_data potentially_correctable_bad_data bad_data nominal_value interpolated_value missing_value";
    Byte flag_values 0, 1, 2, 3, 4, 7, 8, 9;
    String long_name "sea water electrical conductivity quality control flags";
    String variable_type "quality_control";
  }
  PRES_QC {
    UInt32 _ChunkSizes 49;
    Byte _FillValue -1;
    String _Unsigned "true";
    Byte actual_range 1, 1;
    String conventions "OceanSITES QC Flags";
    String flag_meanings "unknown good_data probably_good_data potentially_correctable_bad_data bad_data nominal_value interpolated_value missing_value";
    Byte flag_values 0, 1, 2, 3, 4, 7, 8, 9;
    String long_name "sea water pressure quality control flags";
    String variable_type "quality_control";
  }
  PSAL_QC {
    UInt32 _ChunkSizes 49;
    Byte _FillValue -1;
    String _Unsigned "true";
    Byte actual_range 1, 1;
    String conventions "OceanSITES QC Flags";
    String flag_meanings "unknown good_data probably_good_data potentially_correctable_bad_data bad_data nominal_value interpolated_value missing_value";
    Byte flag_values 0, 1, 2, 3, 4, 7, 8, 9;
    String long_name "sea water salinity quality control flags";
    String variable_type "quality_control";
  }
  SBE37SMP_SN47472_5496 {
    String long_name "Sea-Bird Scientific SBE37 SMP CTD Sensor";
    String sdn_instrument_name "Sea-Bird SBE 37 MicroCat SMP-CTP (submersible) CTD sensor";
    String sdn_instrument_uri "https://vocab.nerc.ac.uk/collection/L22/current/TOOL1457";
    String sdn_instrument_urn "SDN:L22::TOOL1457";
    String sensor_id "SBE37SMP_SN47472_5496";
    String sensor_manufacturer_name "Sea-Bird Scientific";
    String sensor_manufacturer_uri "https://vocab.nerc.ac.uk/collection/L35/current/MAN0013/";
    String sensor_manufacturer_urn "SDN:L35::MAN0013";
    String sensor_mount "mounted_on_seafloor_structure";
    String sensor_orientation "upward";
    String sensor_reference "https://www.seabird.com/moored/sbe-37-sm-smp-smp-odo-microcat/family?productCategoryId=54627473786";
    String sensor_SeaVoX_L22_code "SDN:L22::TOOL1457";
    String sensor_serial_number "37SMP47472-5496";
    String sensor_type_name "CTD";
    String sensor_type_uri "https://vocab.nerc.ac.uk/collection/L05/current/130/";
    String sensor_type_urn "SDN:L05::130";
    String variable_type "sensor";
  }
  OBSEA_seabed_station {
    String comment "The seafloor section of the OBSEA multiparametric cabled observatory seafloor observatory, located at NW mediterranean sea";
    String emso_platform_name "OBSEA seabed station";
    String emso_platform_uri "https://w3id.org/earthsemantics/OSO#OBSEA_seabed_station";
    Float64 latitude 41.18212;
    String long_name "OBSEA seabed station";
    Float64 longitude 1.75257;
    String platform_id "OBSEA_seabed_station";
    String platform_reference "https://obsea.es";
    String platform_type_name "mooring";
    String platform_type_uri "https://vocab.nerc.ac.uk/collection/L06/current/48/";
    String platform_type_urn "SDN:L06::48";
    String variable_type "platform";
    String wmo_platform_code "6103565";
  }
 }
  NC_GLOBAL {
    String cdm_data_type "TimeSeries";
    String cdm_timeseries_variables "platform_id,sensor_id,latitude,longitude,depth";
    String contributor_name "Bart Simpson, Peter Griffin, Rick Sánchez";
    String contributor_role "DataCollector DataManager Researcher";
    String Conventions "OceanSITES EMSO CF-1.8";
    String data_mode "D";
    String data_processing_level "L1";
    String data_processing_steps "L0a L1a L1b";
    String data_type "OceanSITES profile data";
    String date_created "2026-05-26";
    String doi "https://doi.org/10.5281/zenodo.20071769";
    Float64 Easternmost_Easting 1.75257;
    String emso_regional_facility_name "Balearic Sea";
    String emso_regional_facility_uri "https://w3id.org/earthsemantics/OSO#Balearic_Sea";
    String emso_site_name "OBSEA";
    String emso_site_uri "https://w3id.org/earthsemantics/OSO#OBSEA";
    String featureType "TimeSeries";
    String format_version "1.4";
    Float64 geospatial_lat_max 41.18212;
    Float64 geospatial_lat_min 41.18212;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 1.75257;
    Float64 geospatial_lon_min 1.75257;
    String geospatial_lon_units "degrees_east";
    Float64 geospatial_vertical_max 150.3309186;
    Float64 geospatial_vertical_min 0.8043524;
    String geospatial_vertical_positive "down";
    String geospatial_vertical_units "m";
    String history 
"2026-08-18T15:25:49Z (local files)
2026-08-18T15:25:49Z http://localhost:8080/tabledap/example02.das";
    String infoUrl "https://edmo.seadatanet.org/report/2150";
    String institution "UPC - Universitat Politècnica de Catalunya";
    String institution_edmo_code "2150";
    String institution_edmo_uri "https://edmo.seadatanet.org/report/2150";
    String institution_ror_uri "https://ror.org/03mb6wj31";
    String keywords "Balearic Sea, CTD, Earth Science > Oceans > Ocean Pressure > Water Pressure, Earth Science > Oceans > Ocean Temperature > Water Temperature, Earth Science > Oceans > Salinity/Density > Salinity, Electrical conductivity of the water column, mooring, OBSEA, OBSEA seabed station, physical oceanography, Salinity of the water column, sea_water_electrical_conductivity, sea_water_practical_salinity, sea_water_pressure, sea_water_temperature, Temperature of the water column";
    String keywords_type "infrastructure, device, discipline, discipline, discipline, variable, platform, infrastructure, infrastructure, discipline, variable, variable, variable, variable, variable, variable";
    String keywords_uri "https://w3id.org/earthsemantics/OSO#Balearic_Sea https://vocab.nerc.ac.uk/collection/L05/current/130/ https://cmr.earthdata.nasa.gov/kms/concept/dd025312-0d27-44e0-ae05-7cfcc1aa17f0 https://cmr.earthdata.nasa.gov/kms/concept/46206e8c-8def-406f-9e62-da4e74633a58 https://cmr.earthdata.nasa.gov/kms/concept/7e95b5fc-1d58-431a-af36-948b29fa870d https://vocab.nerc.ac.uk/collection/P02/current/CNDC/ https://vocab.nerc.ac.uk/collection/L06/current/48/ https://w3id.org/earthsemantics/OSO#OBSEA https://w3id.org/earthsemantics/OSO#OBSEA_seabed_station http://www.eionet.europa.eu/gemet/concept/6224 https://vocab.nerc.ac.uk/collection/P02/current/PSAL/ https://vocab.nerc.ac.uk/collection/P07/current/CFSN0394/ https://vocab.nerc.ac.uk/collection/P07/current/IADIHDIJ/ https://vocab.nerc.ac.uk/collection/P07/current/CFSN0330/ https://vocab.nerc.ac.uk/collection/P07/current/CFSN0335/ https://vocab.nerc.ac.uk/collection/P02/current/TEMP/";
    String keywords_vocabulary "GCMD Science Keywords, Observatories of the Seas Ontology, SeaDataNet Parameter Discovery Vocabulary, GEMET, SeaDataNet device categories, SeaVoX Platform Categories, Climate and Forecast Standard Names";
    String keywords_vocabulary_uri "https://gcmd.earthdata.nasa.gov/ https://earthportal.eu/ontologies/OSO https://vocab.nerc.ac.uk/collection/P02/current/ https://www.eionet.europa.eu/gemet/ https://vocab.nerc.ac.uk/collection/L05/current/ https://vocab.nerc.ac.uk/collection/L06/current/ https://vocab.nerc.ac.uk/collection/P07/current/";
    String license "CC-BY-4.0";
    String license_uri "https://spdx.org/licenses/CC-BY-4.0";
    String network "EMSO";
    Float64 Northernmost_Northing 41.18212;
    String principal_investigator "Homer Simpson";
    String principal_investigator_email "homer.simpson@fake.com";
    String project "DIGI4ECO GEORGE";
    String project_code "101112883 101094716";
    String project_uri "https://cordis.europa.eu/project/id/101112883 https://cordis.europa.eu/project/id/101094716";
    String source "mooring";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 41.18212;
    String standard_name_vocabulary "CF Standard Name Table v70";
    String subsetVariables "platform_id,sensor_id,depth,TEMP_QC,CNDC_QC,PRES_QC,PSAL_QC";
    String summary "Simple dataset with only one CTD at a fixed depth. Metadata files are split in 4 yaml files: global, platforms, sensors and variables";
    String time_coverage_end "2024-01-02T00:00:00Z";
    String time_coverage_start "2024-01-01T00:00:00Z";
    String title "Example 01: Simple dataset with only one CTD at a fixed depth";
    String update_interval "void";
    Float64 Westernmost_Easting 1.75257;
  }
}

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.