Data Access Form

Dataset Title:	PicoLOOP, LAUV Circumnavigation of Pico Island to Demonstrate Remote Robotic Operations During C3-4OCEAN Activities
Institution:	+ATLANTIC_CoLAB (Dataset ID: LSTS-20250703-LAUV-XP5-WC-PICOLOOP)
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Make a graph

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Variable	Minimum	Maximum
time (UTC)	2025-07-03T10:54:07Z	2025-07-05T08:20:50Z

latitude (degrees_north)	38.35093	38.61699

longitude (degrees_east)	-28.64483	-27.93305

depth (m)	-1.013736128807068	105.0843353271484

ROLL (degrees)	-176.1913412635955	171.8205802702993
PTCH (Pitch, degrees)	-50.15494309433364	64.03253852543847
HDNG (Heading, degrees)	-179.9928196499495	179.9989668202025
APSA (Speed over ground, m s-1)	4.29769008933003E-5	5.090295109946388
APDA (Course over ground, degrees_T)	-179.9960274851765	179.9912952852009
temperature (Sea temperature, degree_C)	15.9370002746582	21.0890007019043
CNDC (Electrical conductivity, S m-1)	0.3939000070095062	5.061000347137451
SVEL (m s-1)	1486.327880859375	1532.080688476562
salinity (Practical Salinity, 0.001)	2.303075075149536	36.42056655883789
PRES (Pressure, hPa)	0.0	1053700.125
SURGE (meters per seconnd)	-2.940395593643188	2.865542888641357
HEAVE (meters per seconnd)	-3.712202787399292	4.702856063842773
SWAY (meters per seconnd)	-1.048435091972351	1.634318709373474
MEDIUM	2.0	3.0

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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.751540047e+9, 1.75170365e+9;
    Float64 ancillary_variables NaN;
    String axis "T";
    String calendar "proleptic_gregorian";
    String ioos_category "Time";
    String long_name "Time";
    String sdn_P02_urn "SDN:P02::AYMD";
    String sdn_parameter_name "Elapsed time relative to 1970-01-01T00:00:00Z";
    String sdn_parameter_urn "SDN:P01::ELTMEP01";
    String sdn_uom_name "Days";
    String sdn_uom_urn "SDN:P06::UTAA";
    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 _FillValue NaN;
    Float32 actual_range 38.35093, 38.61699;
    Float64 ancillary_variables NaN;
    String axis "Y";
    Float64 colorBarMaximum 90.0;
    Float64 colorBarMinimum -90.0;
    String ioos_category "Location";
    String long_name "Latitude of each location";
    String sdn_P02_urn "SDN:P02::ALAT";
    String sdn_parameter_name "Latitude north";
    String sdn_parameter_urn "SDN:P01::ALATZZ01";
    String sdn_uom_name "Degrees north";
    String sdn_uom_urn "SDN:P06::DEGN";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float32 _FillValue NaN;
    Float32 actual_range -28.64483, -27.93305;
    Float64 ancillary_variables NaN;
    String axis "X";
    Float64 colorBarMaximum 180.0;
    Float64 colorBarMinimum -180.0;
    String ioos_category "Location";
    String long_name "Longitude of each location";
    String sdn_P02_urn "SDN:P02::ALAT";
    String sdn_parameter_name "Longitude east";
    String sdn_parameter_urn "SDN:P01::ALONZZ01";
    String sdn_uom_name "Degrees east";
    String sdn_uom_urn "SDN:P06::DEGE";
    String standard_name "longitude";
    String units "degrees_east";
  }
  depth {
    String _CoordinateAxisType "Height";
    String _CoordinateZisPositive "down";
    Float64 _FillValue NaN;
    Float64 actual_range -1.013736128807068, 105.0843353271484;
    Float64 ancillary_variables NaN;
    String axis "Z";
    Float64 colorBarMaximum 8000.0;
    Float64 colorBarMinimum -8000.0;
    String colorBarPalette "TopographyDepth";
    String ioos_category "Location";
    String long_name "Depth";
    String positive "down";
    String sdn_P02_urn "SDN:P02::AHGT";
    String sdn_parameter_name "Depth (spatial coordinate) relative to water surface in the water body";
    String sdn_parameter_urn "SDN:P01::ADEPZZ01";
    String sdn_uom_name "SDN:P06::ULAA";
    String sdn_uom_urn "meters";
    String source_name "DEPH";
    String standard_name "depth";
    String units "m";
  }
  ROLL {
    Float64 _FillValue NaN;
    Float64 actual_range -176.1913412635955, 171.8205802702993;
    Float64 ancillary_variables NaN;
    Float64 comment NaN;
    String ioos_category "Unknown";
    String long_name "Roll";
    String sdn_instrument_name "LAUV Xplore-5";
    Float64 sdn_instrument_urn NaN;
    String sdn_P02_urn "SDN:P02::HEAD";
    String sdn_parameter_name "Orientation (roll angle) of measurement platform by inclinometer";
    String sdn_parameter_urn "SDN:P01::ROLLEI01";
    String sdn_uom_name "Degrees";
    String sdn_uom_urn "SDN:P06::UAAA";
    String sensor_identifier "SDN:L05::115";
    Float64 sensor_manufacturer NaN;
    Float64 sensor_model NaN;
    Float64 sensor_mount NaN;
    Float64 sensor_orientation NaN;
    Float64 sensor_reference NaN;
    Float64 sensor_serial_number NaN;
    String standard_name "platform_roll";
    String units "degrees";
  }
  PTCH {
    Float64 _FillValue NaN;
    Float64 actual_range -50.15494309433364, 64.03253852543847;
    Float64 ancillary_variables NaN;
    Float64 comment NaN;
    String ioos_category "Unknown";
    String long_name "Pitch";
    String sdn_instrument_name "LAUV Xplore-5";
    Float64 sdn_instrument_urn NaN;
    String sdn_P02_urn "SDN:P02::HEAD";
    String sdn_parameter_name "Orientation (pitch) of measurement platform by inclinometer";
    String sdn_parameter_urn "SDN:P01::PTCHEI01";
    String sdn_uom_name "Degrees";
    String sdn_uom_urn "SDN:P06::UAAA";
    String sensor_identifier "SDN:L05::115";
    Float64 sensor_manufacturer NaN;
    Float64 sensor_model NaN;
    Float64 sensor_mount NaN;
    Float64 sensor_orientation NaN;
    Float64 sensor_reference NaN;
    Float64 sensor_serial_number NaN;
    String standard_name "platform_pitch";
    String units "degrees";
  }
  HDNG {
    Float64 _FillValue NaN;
    Float64 actual_range -179.9928196499495, 179.9989668202025;
    Float64 ancillary_variables NaN;
    Float64 comment NaN;
    String ioos_category "Unknown";
    String long_name "Heading";
    String sdn_instrument_name "LAUV Xplore-4";
    Float64 sdn_instrument_urn NaN;
    String sdn_P02_urn "SDN:P02::HEAD";
    String sdn_parameter_name "Orientation (horizontal relative to true north) of measurement device";
    String sdn_parameter_urn "SDN:P01::HEADCM01";
    String sdn_uom_name "Degrees";
    String sdn_uom_urn "SDN:P06::UAAA";
    String sensor_identifier "SDN:L05::115";
    Float64 sensor_manufacturer NaN;
    Float64 sensor_model NaN;
    Float64 sensor_mount NaN;
    Float64 sensor_orientation NaN;
    Float64 sensor_reference NaN;
    Float64 sensor_serial_number NaN;
    String standard_name "platform_orientation";
    String units "degrees";
  }
  APSA {
    Float64 _FillValue NaN;
    Float64 actual_range 4.29769008933003e-5, 5.090295109946388;
    Float64 ancillary_variables NaN;
    Float64 comment NaN;
    String ioos_category "Currents";
    String long_name "Speed over ground";
    String sdn_instrument_name "LAUV Xplore-5";
    Float64 sdn_instrument_urn NaN;
    String sdn_P02_urn "SDN:P02::APDA";
    String sdn_parameter_name "Speed of measurement platform relative to ground surface {speed over ground} by unspecified GPS system";
    String sdn_parameter_urn "SDN:P01::APSAGP01";
    String sdn_uom_name "Metres per second";
    String sdn_uom_urn "SDN:P06::UVAA";
    Float64 sensor_identifier NaN;
    Float64 sensor_manufacturer NaN;
    Float64 sensor_model NaN;
    Float64 sensor_mount NaN;
    Float64 sensor_orientation NaN;
    Float64 sensor_reference NaN;
    Float64 sensor_serial_number NaN;
    String standard_name "platform_speed_wrt_ground";
    String units "m s-1";
  }
  APDA {
    Float64 _FillValue NaN;
    Float64 actual_range -179.9960274851765, 179.9912952852009;
    Float64 ancillary_variables NaN;
    Float64 comment NaN;
    String ioos_category "Unknown";
    String long_name "Course over ground";
    String sdn_instrument_name "LAUV Xplore-5";
    Float64 sdn_instrument_urn NaN;
    String sdn_P02_urn "SDN:P02::APDA";
    String sdn_parameter_name "Direction of motion standard deviation of measurement platform relative to ground surface {course made good} by unspecified GPS system";
    String sdn_parameter_urn "SDN:P01::APDASD01";
    String sdn_uom_name "Degrees True";
    String sdn_uom_urn "SDN:P06::UABB";
    Float64 sensor_identifier NaN;
    Float64 sensor_manufacturer NaN;
    Float64 sensor_model NaN;
    Float64 sensor_mount NaN;
    Float64 sensor_orientation NaN;
    Float64 sensor_reference NaN;
    Float64 sensor_serial_number NaN;
    String standard_name "platform_course";
    String units "degrees_T";
  }
  temperature {
    Float64 _FillValue NaN;
    Float64 actual_range 15.9370002746582, 21.0890007019043;
    Float64 ancillary_variables NaN;
    Float64 colorBarMaximum 32.0;
    Float64 colorBarMinimum 0.0;
    Float64 comment NaN;
    String ioos_category "Temperature";
    String long_name "Sea temperature";
    String reference_scale "ITS-90";
    String sdn_instrument_name "T-Xchange";
    String sdn_instrument_urn "SeaVox_L22_code_TOOL1702";
    String sdn_P02_urn "SDN:P02::TEMP";
    String sdn_parameter_name "Temperature of the water body";
    String sdn_parameter_urn "SDN:P01::TEMPPR01";
    String sdn_uom_name "Degrees Celsius";
    String sdn_uom_urn "SND:P06::UPAA";
    String sensor_identifier "SDN:L05::134";
    String sensor_manufacturer "AML Oceanographic";
    String sensor_model "OEM-X";
    String sensor_mount "mounted_on_glider";
    String sensor_orientation "horizontal";
    String sensor_reference "https://amloceanographic.com/oem-applications";
    Float64 sensor_serial_number 20212;
    String standard_name "sea_water_temperature";
    String units "degree_C";
  }
  CNDC {
    Float64 _FillValue NaN;
    Float64 actual_range 0.3939000070095062, 5.061000347137451;
    Float64 ancillary_variables NaN;
    Float64 colorBarMaximum 40.0;
    Float64 colorBarMinimum 30.0;
    Float64 comment NaN;
    String ioos_category "Salinity";
    String long_name "Electrical conductivity";
    String sdn_instrument_name "C-Xchange";
    String sdn_instrument_urn "SeaVox_L22_code_TOOL1522";
    String sdn_P02_urn "SDN:P02::CNDC";
    String sdn_parameter_name "Electrical conductivity of the water body";
    String sdn_parameter_urn "SDN:P01::CNDCZZ01";
    String sdn_uom_name "Siemens per metre";
    String sdn_uom_urn "SDN:P06::UECA";
    String sensor_identifier "SDN:L05::350";
    String sensor_manufacturer "AML Oceanographic";
    String sensor_model "OEM-X";
    String sensor_mount "mounted_on_glider";
    String sensor_orientation "horizontal";
    String sensor_reference "https://amloceanographic.com/oem-applications";
    Float64 sensor_serial_number 20212;
    String standard_name "sea_water_electrical_conductivity";
    String units "S m-1";
  }
  SVEL {
    Float64 _FillValue NaN;
    Float64 actual_range 1486.327880859375, 1532.080688476562;
    Float64 ancillary_variables NaN;
    Float64 comment NaN;
    String ioos_category "Currents";
    String long_name "Sound velocity in sea water";
    Float64 sdn_instrument_name NaN;
    Float64 sdn_instrument_urn NaN;
    String sdn_P02_urn "SDN:P02::SVEL";
    String sdn_parameter_name "Sound velocity in the water body";
    String sdn_parameter_urn "SDN:P01::SVELXXXX";
    String sdn_uom_name "Metres per second";
    String sdn_uom_urn "SDN:P06::UVAA";
    String sensor_identifier "SDN:L05::185";
    Float64 sensor_manufacturer NaN;
    Float64 sensor_model NaN;
    Float64 sensor_mount NaN;
    Float64 sensor_orientation NaN;
    String sensor_reference "https://amloceanographic.com/oem-applications";
    Float64 sensor_serial_number NaN;
    String standard_name "speed_of_sound_in_sea_water";
    String units "m s-1";
  }
  salinity {
    Float64 _FillValue NaN;
    Float64 actual_range 2.303075075149536, 36.42056655883789;
    Float64 ancillary_variables NaN;
    Float64 colorBarMaximum 37.0;
    Float64 colorBarMinimum 32.0;
    Float64 comment NaN;
    String ioos_category "Salinity";
    String long_name "Practical Salinity";
    String QC_indicator "unkown";
    String sdn_instrument_name "D-Xchange";
    String sdn_instrument_urn "SeaVox_L22_code_TOOL1522";
    String sdn_P02_urn "SDN:P02::PSAL";
    String sdn_parameter_name "Practical salinity of the water body by CTD and computation using UNESCO 1983 algorithm";
    String sdn_parameter_urn "SDN:P01::PSALST01";
    String sdn_uom_name "Dimensionless";
    String sdn_uom_urn "SDN:P06::UUUU";
    String sensor_identifier "SDN:L05::350";
    String sensor_manufacturer "AML Oceanographic";
    String sensor_model "OEM-X";
    String sensor_mount "mounted_on_glider";
    String sensor_orientation "horizontal";
    String sensor_reference "https://amloceanographic.com/oem-applications";
    Float64 sensor_serial_number 20212;
    String standard_name "sea_water_practical_salinity";
    Float64 units 0.001;
  }
  PRES {
    Float64 _FillValue NaN;
    Float64 actual_range 0.0, 1053700.125;
    Float64 ancillary_variables NaN;
    Float64 colorBarMaximum 5000.0;
    Float64 colorBarMinimum 0.0;
    Float64 comment NaN;
    String ioos_category "Pressure";
    String long_name "Pressure";
    String sdn_instrument_name "PAA-6X";
    Float64 sdn_instrument_urn NaN;
    String sdn_P02_urn "SDN:P02::AHGT";
    String sdn_parameter_name "The force per unit area exerted by the water column on a mobile sensor located in the   water column.";
    String sdn_parameter_urn "SDN:P01::PRESPR01";
    String sdn_uom_name "Hectopascal";
    String sdn_uom_urn "SDN:P06::HPAX";
    String sensor_identifier "https://download.keller-druck.com/api/download/SR6kWpFB2xqmjWsQPJ2Tk8/en/latest.pdf";
    String sensor_manufacturer "Keller AG";
    String sensor_model "PAA-6X";
    Float64 sensor_mount NaN;
    Float64 sensor_orientation NaN;
    String standard_name "sea_water_pressure";
    String units "hPa";
  }
  SURGE {
    Float64 _FillValue NaN;
    Float64 actual_range -2.940395593643188, 2.865542888641357;
    Float64 ancillary_variables NaN;
    Float64 comment NaN;
    String ioos_category "Unknown";
    String long_name "Surge";
    String sdn_instrument_name "LAUV Xplore-5";
    Float64 sdn_instrument_urn NaN;
    String sdn_P02_urn "SDN:P02::APDA";
    String sdn_parameter_name "The best estimate using onboard navigation system and algorithm of a platforms velocity along its xaxis.";
    String sdn_parameter_urn "SDN:P01::PTVELX01";
    String sdn_uom_name "Horizontal platform movement";
    String sdn_uom_urn "SDN:P02::APDA";
    Float64 sensor_identifier NaN;
    Float64 sensor_manufacturer NaN;
    Float64 sensor_model NaN;
    Float64 sensor_mount NaN;
    Float64 sensor_orientation NaN;
    Float64 sensor_reference NaN;
    Float64 sensor_serial_number NaN;
    String standard_name "platformvelx_bestestimate";
    String units "meters per seconnd";
  }
  HEAVE {
    Float64 _FillValue NaN;
    Float64 actual_range -3.712202787399292, 4.702856063842773;
    Float64 ancillary_variables NaN;
    Float64 comment NaN;
    String ioos_category "Unknown";
    String long_name "Heave";
    String sdn_instrument_name "LAUV Xplore-5";
    Float64 sdn_instrument_urn NaN;
    String sdn_P02_urn "SDN:P02::APZA";
    String sdn_parameter_name "The best estimate using onboard navigation system and algorithm of a platforms velocity along its z-axis.";
    String sdn_parameter_urn "SDN:P01::PTVELZ01";
    String sdn_uom_name "Horizontal platform movement";
    String sdn_uom_urn "SDN:P02::APDA";
    Float64 sensor_identifier NaN;
    Float64 sensor_manufacturer NaN;
    Float64 sensor_model NaN;
    Float64 sensor_mount NaN;
    Float64 sensor_orientation NaN;
    Float64 sensor_reference NaN;
    Float64 sensor_serial_number NaN;
    String standard_name "platformvelz_bestestimate";
    String units "meters per seconnd";
  }
  SWAY {
    Float64 _FillValue NaN;
    Float64 actual_range -1.048435091972351, 1.634318709373474;
    Float64 ancillary_variables NaN;
    Float64 comment NaN;
    String ioos_category "Unknown";
    String long_name "Sway";
    String sdn_instrument_name "LAUV Xplore-5";
    Float64 sdn_instrument_urn NaN;
    String sdn_P02_urn "SDN:P02::APDA";
    String sdn_parameter_name "The best estimate using onboard navigation system and algorithm of a platforms velocity along its y-axis.";
    String sdn_parameter_urn "SDN:P01::PTVELY01";
    String sdn_uom_name "Horizontal platform movement";
    String sdn_uom_urn "SDN:P02::APDA";
    Float64 sensor_identifier NaN;
    Float64 sensor_manufacturer NaN;
    Float64 sensor_model NaN;
    Float64 sensor_mount NaN;
    Float64 sensor_orientation NaN;
    Float64 sensor_reference NaN;
    Float64 sensor_serial_number NaN;
    String standard_name "platformvely_bestestimate";
    String units "meters per seconnd";
  }
  MEDIUM {
    Float64 _FillValue NaN;
    Float64 actual_range 2.0, 3.0;
    String ioos_category "Unknown";
    String long_name "MEDIUM";
    Float64 missing_value NaN;
  }
 }
  NC_GLOBAL {
    String cdm_data_type "Other";
    String Conventions "OceanSITES v1.4,SeaDataNet_1.0,COARDS, CF-1.10, CMEMS INSTAC v3.2, ACDD-1.3, NCCSV-1.2";
    String creator_name "SeaDataNet";
    String creator_url "https://www.seadatanet.org/";
    String data_assembly_center "+ATLANTIC CoLAB, Portugal";
    Float64 data_assembly_center_edmo_code 5952;
    String data_assembly_center_edmo_uri "https://colabatlantic.com/";
    String data_assembly_center_ror_code "05avbyr67";
    String data_assembly_center_ror_uri "https://ror.org/05avbyr67";
    String data_assembly_center_uri "https://colabatlantic.com/";
    String data_assembly_name "+ATLANTIC CoLAB, Portugal";
    String data_mode "D";
    String data_owner "LaboratÃ³rio de Sistemas e Tecnologia SubaquÃ¡tica (LSTS) - Faculty of Engineering - University of Porto";
    String data_owner_country "Portugal";
    String data_owner_country_code "PT";
    Float64 data_owner_edmo_code 5687;
    String data_owner_edmo_uri "https://edmo.seadatanet.org/report/5687";
    String data_owner_ror_code "014s45j06";
    String data_owner_ror_uri "https://ror.org/014s45j06";
    String data_owner_uri "https://www.fe.up.pt";
    String data_type "OceanSITES trajectory data";
    String date_created "2025-07-16T16:27:08Z";
    Float64 Easternmost_Easting -27.93305;
    Float64 format_version 1.5;
    Float64 geospatial_lat_max 38.61699;
    Float64 geospatial_lat_min 38.35093;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -27.93305;
    Float64 geospatial_lon_min -28.64483;
    String geospatial_lon_units "degrees_east";
    Float64 geospatial_vertical_max 105.0843353271484;
    Float64 geospatial_vertical_min -1.013736128807068;
    String geospatial_vertical_positive "down";
    String geospatial_vertical_units "m";
    String history 
"Autonomous Underwater Vehicle
2025-12-12T21:49:16Z (local files)
2025-12-12T21:49:16Z http://test.colabatlantic.com/erddap/tabledap/LSTS-20250703-LAUV-XP5-WC-PICOLOOP.html";
    String infoUrl "https://www.seadatanet.org/";
    String institution "+ATLANTIC_CoLAB";
    String keywords "+atlantic, 4ocean, acoustic, acoustics, activities, APDA, APSA, bestestimate, body, c3-4ocean, circumnavigation, cndc, colab, column, conductivity, course, currents, data, demonstrate, density, depth, during, earth, Earth Science > Oceans > Ocean Acoustics > Acoustic Velocity, Earth Science > Oceans > Ocean Pressure > Water Pressure, Earth Science > Oceans > Ocean Temperature > Water Temperature, Earth Science > Oceans > Salinity/Density > Conductivity, Earth Science > Oceans > Salinity/Density > Salinity, electrical, ground, HDNG, heading, heave, island, latitude, lauv, longitude, medium, NODC-PT, ocean, oceans, operations, orientation, over, pico, picoloop, pitch, platform, platform_course, platform_orientation, platform_pitch, platform_roll, platform_speed_wrt_ground, platformvelx, platformvelx_bestestimate, platformvely, platformvely_bestestimate, platformvelz, platformvelz_bestestimate, practical, PRES, pressure, psal, PTCH, remote, robotic, roll, salinity, science, sea, sea_water_electrical_conductivity, sea_water_practical_salinity, sea_water_pressure, sea_water_temperature, seawater, sound, speed, speed_of_sound_in_sea_water, surge, svel, sway, TEMP, temperature, time, velocity, water, wc_cond, wc_sal, wc_soundvel, wc_temp, wrt";
    String keywords_vocabulary "GCMD Science Keywords";
    String license "CC-BY";
    String logo "https://erddap.atlanticsense.com/erddap/files/logos/feup.png";
    String network "EMSO-ERIC";
    Float64 Northernmost_Northing 38.61699;
    String principal_investigator "João Borges de Sousa";
    String principal_investigator_email "jtasso@fe.up.pt";
    String project "FRESNEL - ONR - N0014-22-1-2796";
    String QC_indicator "unkown";
    String source "Autonomous Underwater Vehicle";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 38.35093;
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary "PicoLOOP - LAUV Circumnavigation of Pico Island to Demonstrate Remote Robotic Operations During C3-4OCEAN Activities. auv_marine_robotics. +ATLANTIC_CoLAB data from a local source.";
    String testOutOfDate "now-37days";
    String time_coverage_end "2025-07-05T08:20:50Z";
    String time_coverage_start "2025-07-03T10:54:07Z";
    String title "PicoLOOP, LAUV Circumnavigation of Pico Island to Demonstrate Remote Robotic Operations During C3-4OCEAN Activities";
    String update_interval "void";
    Float64 Westernmost_Easting -28.64483;
  }
}

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.