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Dataset Title:	CTD data at OBSEA Underwater Observatory 30 min average
Institution:	Polytechnic University of Catalonia   (Dataset ID: EMSO_OBSEA_CTD_30min)
Information:	Summary | License | FGDC | ISO 19115 | Metadata | Background | Subset | Make a graph

 

Variable	Optional Constraint #1		Optional Constraint #2		Minimum    or a List of Values	Maximum
time (time of measurements, UTC)	!= =~ <= >= = < >		!= =~ <= >= = < >		2010-03-12T09:30:00Z	2022-12-31T23:30:00Z
latitude (degrees_north)	!= =~ <= >= = < >		!= =~ <= >= = < >		41.18212	41.18212
longitude (degrees_east)	!= =~ <= >= = < >		!= =~ <= >= = < >		1.75257	1.75257
depth (depth of measurements, m)	!= =~ <= >= = < >		!= =~ <= >= = < >		20.0	20.0
sensor_id	!= =~ <= >= = < >		!= =~ <= >= = < >		"16P57353-6479" "37SMP47472-5496"
PSAL (Dimensionless)	!= =~ <= >= = < >		!= =~ <= >= = < >		30.6657	38.3993
PRES (Decibars)	!= =~ <= >= = < >		!= =~ <= >= = < >		17.812	20.627
SVEL (Metres per second)	!= =~ <= >= = < >		!= =~ <= >= = < >		1477.31	1543.28
CNDC (Siemens per metre)	!= =~ <= >= = < >		!= =~ <= >= = < >		3.34454	6.07853
TEMP (Degrees Celsius)	!= =~ <= >= = < >		!= =~ <= >= = < >		11.6421	27.9557
PSAL_QC	!= =~ <= >= = < >		!= =~ <= >= = < >		1 3 9
PRES_QC	!= =~ <= >= = < >		!= =~ <= >= = < >		1 3 9
SVEL_QC	!= =~ <= >= = < >		!= =~ <= >= = < >		1 9
CNDC_QC	!= =~ <= >= = < >		!= =~ <= >= = < >		1 3 9
TEMP_QC	!= =~ <= >= = < >		!= =~ <= >= = < >		1 3 9
latitude_QC	!= =~ <= >= = < >		!= =~ <= >= = < >		7
longitude_QC	!= =~ <= >= = < >		!= =~ <= >= = < >		7
depth_QC	!= =~ <= >= = < >		!= =~ <= >= = < >		7

 

Server-side Functions

distinct()

orderBy orderByClosest orderByCount orderByLimit orderByMax orderByMin orderByMinMax orderByMean orderBySum (" time latitude longitude depth sensor_id PSAL PRES SVEL CNDC TEMP PSAL_QC PRES_QC SVEL_QC CNDC_QC TEMP_QC latitude_QC longitude_QC depth_QC time latitude longitude depth sensor_id PSAL PRES SVEL CNDC TEMP PSAL_QC PRES_QC SVEL_QC CNDC_QC TEMP_QC latitude_QC longitude_QC depth_QC time latitude longitude depth sensor_id PSAL PRES SVEL CNDC TEMP PSAL_QC PRES_QC SVEL_QC CNDC_QC TEMP_QC latitude_QC longitude_QC depth_QC time latitude longitude depth sensor_id PSAL PRES SVEL CNDC TEMP PSAL_QC PRES_QC SVEL_QC CNDC_QC TEMP_QC latitude_QC longitude_QC depth_QC time latitude longitude depth sensor_id PSAL PRES SVEL CNDC TEMP PSAL_QC PRES_QC SVEL_QC CNDC_QC TEMP_QC latitude_QC longitude_QC depth_QC ")

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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  time {
    Int32 _ChunkSizes 882;
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.2683862e+9, 1.6725294e+9;
    String axis "T";
    String ioos_category "Time";
    String long_name "time of measurements";
    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 time_precision "1970-01-01T00:00:00Z";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  latitude {
    Int32 _ChunkSizes 1;
    String _CoordinateAxisType "Lat";
    Float32 _FillValue -999999.0;
    Float32 actual_range 41.18212, 41.18212;
    String ancillary_variables "LATITUDE_QC";
    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";
  }
  longitude {
    Int32 _ChunkSizes 1;
    String _CoordinateAxisType "Lon";
    Float32 _FillValue -999999.0;
    Float32 actual_range 1.75257, 1.75257;
    String ancillary_variables "LONGITUDE_QC";
    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";
  }
  depth {
    Int32 _ChunkSizes 1;
    String _CoordinateAxisType "Height";
    String _CoordinateZisPositive "down";
    Float32 _FillValue -999999.0;
    Float32 actual_range 20.0, 20.0;
    String ancillary_variables "DEPTH_QC";
    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";
  }
  sensor_id {
    Int32 _ChunkSizes 1;
    String long_name "Identifier of the sensor that took the measurement";
  }
  PSAL {
    Int32 _ChunkSizes 1, 1, 1, 1, 882;
    Float32 _FillValue -999999.0;
    Float32 actual_range 30.6657, 38.3993;
    String ancillary_variables "PSAL_QC;PSAL_STD";
    String coordinates "LATITUDE;LONGITUDE;DEPTH;SENSOR_ID;TIME";
    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 "Dimensionless";
    String sdn_uom_uri "https://vocab.nerc.ac.uk/collection/P06/current/UUUU";
    String sdn_uom_urn "SDN:P06::UUUU";
    String sensor_manufacturer "Sea-Bird Scientific;Sea-Bird Scientific";
    String sensor_manufacturer_uri "https://vocab.nerc.ac.uk/collection/L35/current/MAN0013/;https://vocab.nerc.ac.uk/collection/L35/current/MAN0013/";
    String sensor_manufacturer_urn "SDN:L35::MAN0013;SDN:L35::MAN0013";
    String sensor_model "Sea-Bird SBE 37 MicroCat SMP-CTP (submersible) CTD sensor;Sea-Bird SBE 16Plus V2 SEACAT C-T Recorder";
    String sensor_mount "mounted_on_fixed_structure;mounted_on_fixed_structure";
    String sensor_orientation "upward;upward";
    String sensor_reference "https://vocab.nerc.ac.uk/collection/L22/current/TOOL1457/;https://vocab.nerc.ac.uk/collection/L22/current/TOOL0870";
    String sensor_SeaVoX_L22_code "SDN:L22::TOOL1457;SDN:L22::TOOL0870";
    String sensor_serial_number "37SMP47472-5496;16P57353-6479";
    String standard_name "sea_water_salinity";
    String units "Dimensionless";
  }
  PRES {
    Int32 _ChunkSizes 1, 1, 1, 1, 882;
    Float32 _FillValue -999999.0;
    Float32 actual_range 17.812, 20.627;
    String ancillary_variables "PRES_QC;PRES_STD";
    String coordinates "LATITUDE;LONGITUDE;DEPTH;SENSOR_ID;TIME";
    String long_name "pressure that exists in the medium of sea water";
    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 sensor_manufacturer "Sea-Bird Scientific;Sea-Bird Scientific";
    String sensor_manufacturer_uri "https://vocab.nerc.ac.uk/collection/L35/current/MAN0013/;https://vocab.nerc.ac.uk/collection/L35/current/MAN0013/";
    String sensor_manufacturer_urn "SDN:L35::MAN0013;SDN:L35::MAN0013";
    String sensor_model "Sea-Bird SBE 37 MicroCat SMP-CTP (submersible) CTD sensor;Sea-Bird SBE 16Plus V2 SEACAT C-T Recorder";
    String sensor_mount "mounted_on_fixed_structure;mounted_on_fixed_structure";
    String sensor_orientation "upward;upward";
    String sensor_reference "https://vocab.nerc.ac.uk/collection/L22/current/TOOL1457/;https://vocab.nerc.ac.uk/collection/L22/current/TOOL0870";
    String sensor_SeaVoX_L22_code "SDN:L22::TOOL1457;SDN:L22::TOOL0870";
    String sensor_serial_number "37SMP47472-5496;16P57353-6479";
    String standard_name "sea_water_pressure";
    String units "Decibars";
  }
  SVEL {
    Int32 _ChunkSizes 1, 1, 1, 1, 882;
    Float32 _FillValue -999999.0;
    Float32 actual_range 1477.31, 1543.28;
    String ancillary_variables "SVEL_QC;SVEL_STD";
    String coordinates "LATITUDE;LONGITUDE;DEPTH;SENSOR_ID;TIME";
    String long_name "speed of sound in sea water";
    String sdn_parameter_name "Sound velocity in the water body by CTD and computation from temperature and salinity by unspecified algorithm";
    String sdn_parameter_uri "https://vocab.nerc.ac.uk/collection/P01/current/SVELCT01/";
    String sdn_parameter_urn "SDN:P01::SVELCT01";
    String sdn_uom_name "Metres per second";
    String sdn_uom_uri "https://vocab.nerc.ac.uk/collection/P06/current/UVAA/";
    String sdn_uom_urn "SDN:P06::UVAA";
    String sensor_manufacturer "Sea-Bird Scientific;Sea-Bird Scientific";
    String sensor_manufacturer_uri "https://vocab.nerc.ac.uk/collection/L35/current/MAN0013/;https://vocab.nerc.ac.uk/collection/L35/current/MAN0013/";
    String sensor_manufacturer_urn "SDN:L35::MAN0013;SDN:L35::MAN0013";
    String sensor_model "Sea-Bird SBE 37 MicroCat SMP-CTP (submersible) CTD sensor;Sea-Bird SBE 16Plus V2 SEACAT C-T Recorder";
    String sensor_mount "mounted_on_fixed_structure;mounted_on_fixed_structure";
    String sensor_orientation "upward;upward";
    String sensor_reference "https://vocab.nerc.ac.uk/collection/L22/current/TOOL1457/;https://vocab.nerc.ac.uk/collection/L22/current/TOOL0870";
    String sensor_SeaVoX_L22_code "SDN:L22::TOOL1457;SDN:L22::TOOL0870";
    String sensor_serial_number "37SMP47472-5496;16P57353-6479";
    String standard_name "speed_of_sound_in_sea_water";
    String units "Metres per second";
  }
  CNDC {
    Int32 _ChunkSizes 1, 1, 1, 1, 882;
    Float32 _FillValue -999999.0;
    Float32 actual_range 3.34454, 6.07853;
    String ancillary_variables "CNDC_QC;CNDC_STD";
    String coordinates "LATITUDE;LONGITUDE;DEPTH;SENSOR_ID;TIME";
    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 sensor_manufacturer "Sea-Bird Scientific;Sea-Bird Scientific";
    String sensor_manufacturer_uri "https://vocab.nerc.ac.uk/collection/L35/current/MAN0013/;https://vocab.nerc.ac.uk/collection/L35/current/MAN0013/";
    String sensor_manufacturer_urn "SDN:L35::MAN0013;SDN:L35::MAN0013";
    String sensor_model "Sea-Bird SBE 37 MicroCat SMP-CTP (submersible) CTD sensor;Sea-Bird SBE 16Plus V2 SEACAT C-T Recorder";
    String sensor_mount "mounted_on_fixed_structure;mounted_on_fixed_structure";
    String sensor_orientation "upward;upward";
    String sensor_reference "https://vocab.nerc.ac.uk/collection/L22/current/TOOL1457/;https://vocab.nerc.ac.uk/collection/L22/current/TOOL0870";
    String sensor_SeaVoX_L22_code "SDN:L22::TOOL1457;SDN:L22::TOOL0870";
    String sensor_serial_number "37SMP47472-5496;16P57353-6479";
    String standard_name "sea_water_electrical_conductivity";
    String units "Siemens per metre";
  }
  TEMP {
    Int32 _ChunkSizes 1, 1, 1, 1, 882;
    Float32 _FillValue -999999.0;
    Float32 actual_range 11.6421, 27.9557;
    String ancillary_variables "TEMP_QC;TEMP_STD";
    String coordinates "LATITUDE;LONGITUDE;DEPTH;SENSOR_ID;TIME";
    String long_name "in situ sea water temperature";
    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 sensor_manufacturer "Sea-Bird Scientific;Sea-Bird Scientific";
    String sensor_manufacturer_uri "https://vocab.nerc.ac.uk/collection/L35/current/MAN0013/;https://vocab.nerc.ac.uk/collection/L35/current/MAN0013/";
    String sensor_manufacturer_urn "SDN:L35::MAN0013;SDN:L35::MAN0013";
    String sensor_model "Sea-Bird SBE 37 MicroCat SMP-CTP (submersible) CTD sensor;Sea-Bird SBE 16Plus V2 SEACAT C-T Recorder";
    String sensor_mount "mounted_on_fixed_structure;mounted_on_fixed_structure";
    String sensor_orientation "upward;upward";
    String sensor_reference "https://vocab.nerc.ac.uk/collection/L22/current/TOOL1457/;https://vocab.nerc.ac.uk/collection/L22/current/TOOL0870";
    String sensor_SeaVoX_L22_code "SDN:L22::TOOL1457;SDN:L22::TOOL0870";
    String sensor_serial_number "37SMP47472-5496;16P57353-6479";
    String standard_name "sea_water_temperature";
    String units "Degrees Celsius";
  }
  PSAL_QC {
    Int32 _ChunkSizes 1, 1, 1, 1, 882;
    Byte _FillValue -63;
    String _Unsigned "false";
    Byte actual_range 1, 9;
    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";
    String flag_values "0;1;2;3;4;7;8;9";
    String long_name "sea water salinity quality control flags";
  }
  PRES_QC {
    Int32 _ChunkSizes 1, 1, 1, 1, 882;
    Byte _FillValue -63;
    String _Unsigned "false";
    Byte actual_range 1, 9;
    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";
    String flag_values "0;1;2;3;4;7;8;9";
    String long_name "pressure that exists in the medium of sea water quality control flags";
  }
  SVEL_QC {
    Int32 _ChunkSizes 1, 1, 1, 1, 882;
    Byte _FillValue -63;
    String _Unsigned "false";
    Byte actual_range 1, 9;
    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";
    String flag_values "0;1;2;3;4;7;8;9";
    String long_name "speed of sound in sea water quality control flags";
  }
  CNDC_QC {
    Int32 _ChunkSizes 1, 1, 1, 1, 882;
    Byte _FillValue -63;
    String _Unsigned "false";
    Byte actual_range 1, 9;
    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";
    String flag_values "0;1;2;3;4;7;8;9";
    String long_name "sea water electrical conductivity quality control flags";
  }
  TEMP_QC {
    Int32 _ChunkSizes 1, 1, 1, 1, 882;
    Byte _FillValue -63;
    String _Unsigned "false";
    Byte actual_range 1, 9;
    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";
    String flag_values "0;1;2;3;4;7;8;9";
    String long_name "in situ sea water temperature quality control flags";
  }
  latitude_QC {
    Int32 _ChunkSizes 1, 1, 1, 1, 882;
    Byte _FillValue -63;
    String _Unsigned "false";
    Byte actual_range 7, 7;
    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";
    String flag_values "0;1;2;3;4;7;8;9";
    String long_name "latitude of measurements quality control flags";
  }
  longitude_QC {
    Int32 _ChunkSizes 1, 1, 1, 1, 882;
    Byte _FillValue -63;
    String _Unsigned "false";
    Byte actual_range 7, 7;
    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";
    String flag_values "0;1;2;3;4;7;8;9";
    String long_name "longitude of measurements quality control flags";
  }
  depth_QC {
    Int32 _ChunkSizes 1, 1, 1, 1, 882;
    Byte _FillValue -63;
    String _Unsigned "false";
    Byte actual_range 7, 7;
    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";
    String flag_values "0;1;2;3;4;7;8;9";
    String long_name "depth of measurements quality control flags";
  }
 }
  NC_GLOBAL {
    String cdm_data_type "Point";
    String Conventions "OceanSITES;EMSO";
    String data_mode "R";
    String data_type "OceanSITES time-series data";
    String date_created "2023-10-25T14:49:16Z";
    String date_modified "2023-10-25T14:49:16Z";
    Float64 Easternmost_Easting 1.75257;
    String emso_facility "OBSEA";
    String featureType "Point";
    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 20.0;
    Float64 geospatial_vertical_min 20.0;
    String geospatial_vertical_positive "down";
    String geospatial_vertical_units "m";
    String history 
"2024-11-23T15:08:21Z (local files)
2024-11-23T15:08:21Z https://data.obsea.es/erddap/tabledap/EMSO_OBSEA_CTD_30min.html";
    String infoUrl "https://edmo.seadatanet.org/report/2150";
    String institution "Polytechnic University of Catalonia";
    String institution_edmo_code "2150";
    String institution_edmo_uri "https://edmo.seadatanet.org/report/2150";
    String keywords "CNDC, PRES, PSAL, SVEL, TEMP";
    String keywords_vocabulary "SeaDataNet Parameter Discovery Vocabulary";
    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 "Joaquin del Rio";
    String principal_investigator_email "joaquin.del.rio@upc.edu";
    String source "mooring";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 41.18212;
    String standard_name_vocabulary "CF Standard Name Table v70";
    String subsetVariables "PSAL_QC, PRES_QC, SVEL_QC, CNDC_QC, TEMP_QC, latitude_QC, longitude_QC, depth_QC, sensor_id";
    String summary "CTD data measured at OBSEA underwater observatory";
    String time_coverage_end "2022-12-31T23:30:00Z";
    String time_coverage_start "2010-03-12T09:30:00Z";
    String title "CTD data at OBSEA Underwater Observatory 30 min average";
    String update_interval "void";
    Float64 Westernmost_Easting 1.75257;
  }
}

 

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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 Data Access Protocol (DAP) and its selection constraints.

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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