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Dataset Title:	Sea Level data reported in Histoire Physique de la mer (1725) of L.F. Marsili and transformed to calculate the M2 tidal amplitude
Institution:	Istituto Nazionale di Geofisica e Vulcanologia, Sede di Roma2 (INGV) (Dataset ID: SEALEVEL_PLATE_X_XI_PAGE_26)
Range:	longitude = 5.534 to 5.534°E, latitude = 43.214 to 43.214°N, time = 1707-01-05T00:00:00Z to 1707-04-10T00:00:00Z
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Subset \| Data Access Form

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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  SDN_EDMO_CODE {
    Int32 _FillValue 2147483647;
    Int32 actual_range 3917, 3917;
    String long_name "European Directory of Marine Organizations code for the CDI partner";
  }
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range -8.299152e+9, -8.290944e+9;
    String ancillary_variables "TIME_SEADATANET_QC";
    String axis "T";
    String calendar "julian";
    String ioos_category "Time";
    String long_name "Chronological Julian Date";
    String sdn_P02_urn "SDN:P02::AYMD";
    String sdn_parameter_name "Julian Date (chronological)";
    String sdn_parameter_urn "SDN:P01::CJDY1101";
    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";
  }
  TIME_SEADATANET_QC {
    Byte _FillValue -127;
    String _Unsigned "false";
    Byte actual_range 1, 1;
    Float64 colorBarMaximum 150.0;
    Float64 colorBarMinimum 0.0;
    String Conventions "SeaDataNet measurand qualifier flags";
    String flag_meanings "no_quality_control good_value probably_good_value probably_bad_value bad_value changed_value value_below_detection value_in_excess interpolated_value missing_value";
    String flag_value "0b, 1b, 2b, 3b, 4b, 5b, 6b, 7b, 8b, 9b";
    String long_name "SeaDataNet quality flag";
    String sdn_conventions_urn "SDN:L20::";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float64 actual_range 5.534, 5.534;
    String ancillary_variables "POSITION_SEADATANET_QC";
    String axis "X";
    Float64 colorBarMaximum 180.0;
    Float64 colorBarMinimum -180.0;
    String comment "The geographic locations shown on Plate VII page 23 and the amphorae positions on the map (Plate I page 3 and Plate II page 4) were used to extrapolate the coordinates of the 12 sampled points together with a cartographic comparison in QGIS 3.22. Coordinates were only assigned to the locations marked by the amphorae (Plate I page 3 and Plate II page 4) and were not precise since the map in Marsili’s book doesn’t show the coordinates.";
    String ioos_category "Location";
    String long_name "Longitude";
    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";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float64 actual_range 43.214, 43.214;
    String ancillary_variables "POSITION_SEADATANET_QC";
    String axis "Y";
    Float64 colorBarMaximum 90.0;
    Float64 colorBarMinimum -90.0;
    String comment "The geographic locations shown on Plate VII page 23 and the amphorae positions on the map (Plate I page 3 and Plate II page 4) were used to extrapolate the coordinates of the 12 sampled points together with a cartographic comparison in QGIS 3.22. Coordinates were only assigned to the locations marked by the amphorae (Plate I page 3 and Plate II page 4) and were not precise since the map in Marsili’s book doesn’t show the coordinates.";
    String ioos_category "Location";
    String long_name "Latitude";
    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";
  }
  POSITION_SEADATANET_QC {
    Byte _FillValue -127;
    String _Unsigned "false";
    Byte actual_range 2, 2;
    Float64 colorBarMaximum 150.0;
    Float64 colorBarMinimum 0.0;
    String Conventions "SeaDataNet measurand qualifier flags";
    String flag_meanings "no_quality_control good_value probably_good_value probably_bad_value bad_value changed_value value_below_detection value_in_excess interpolated_value missing_value";
    String flag_value "0b, 1b, 2b, 3b, 4b, 5b, 6b, 7b, 8b, 9b";
    String long_name "SeaDataNet quality flag";
    String sdn_conventions_urn "SDN:L20::";
  }
  ASLVZZ01 {
    Float32 _FillValue -99999.0;
    Float32 actual_range 21.5, 46.0;
    String ancillary_variables "ASLVZZ01_SEADATANET_QC";
    Float64 colorBarMaximum 2.0;
    Float64 colorBarMinimum -2.0;
    String long_name "water surface height above a specific datum";
    String sdn_P02_urn "SDN:P02::ASLV";
    String sdn_parameter_name "Surface elevation relative to unspecified datum of the water body";
    String sdn_parameter_urn "SDN:P01::ASLVZZ01";
    String standard_name "sea_surface_height";
    String units "inches";
  }
  ASLVZZ01_SEADATANET_QC {
    Byte _FillValue -127;
    String _Unsigned "false";
    Byte actual_range 0, 0;
    Float64 colorBarMaximum 150.0;
    Float64 colorBarMinimum 0.0;
    String comment "Water surface height flags following seadatanet flags";
    String Conventions "SeaDataNet measurand qualifier flags";
    String flag_meanings "no_quality_control good_value probably_good_value probably_bad_value bad_value changed_value value_below_detection value_in_excess interpolated_value missing_value";
    String flag_value "0b, 1b, 2b, 3b, 4b, 5b, 6b, 7b, 8b, 9b";
    String long_name "ASLVZZ01 SEADATANET QC";
    String sdn_conventions_urn "SDN:L20::";
  }
  ASLVMSTP {
    Float32 _FillValue -99999.0;
    Float32 actual_range -0.06823993, 0.09135273;
    String ancillary_variables "ASLVMSTP_SEADATANET_QC";
    String long_name "water surface height above a specific datum";
    String sdn_P02_urn "SDN:P02::ASLV";
    String sdn_parameter_name "Surface elevation relative to Mean Sea Level datum of the water body by unspecified prediction algorithm";
    String sdn_parameter_urn "SDN:P01::ASLVMSTP";
    String sdn_uom_name "Metres";
    String sdn_uom_urn "SDN:P06::ULAA";
    String standard_name "water_surface_height_above_a_specific_datum";
    String units "Metres";
  }
  ASLVMSTP_SEADATANET_QC {
    Byte _FillValue -127;
    String _Unsigned "false";
    Byte actual_range 0, 0;
    Float64 colorBarMaximum 150.0;
    Float64 colorBarMinimum 0.0;
    String comment "Surface elevation flags following seadatanet flags";
    String Conventions "SeaDataNet measurand qualifier flags";
    String flag_meanings "no_quality_control good_value probably_good_value probably_bad_value bad_value changed_value value_below_detection value_in_excess interpolated_value missing_value";
    String flag_value "0b, 1b, 2b, 3b, 4b, 5b, 6b, 7b, 8b, 9b";
    String long_name "ASLVMSTP SEADATANET QC";
    String sdn_conventions_urn "SDN:L20::";
  }
  AMPLITUDE {
    Float32 _FillValue -99999.0;
    Float32 actual_range -0.03999996, 0.03999993;
    String ancillary_variables "AMPLITUDE_SEADATANET_QC";
    Float64 colorBarMaximum 2.0;
    Float64 colorBarMinimum -2.0;
    String long_name "Ocean tide amplitude at M2 frequency";
    String sdn_uom_name "Metres";
    String sdn_uom_urn "SDN:P06::ULAA";
    String units "Metres";
  }
  AMPLITUDE_SEADATANET_QC {
    Byte _FillValue -127;
    String _Unsigned "false";
    Byte actual_range 8, 8;
    Float64 colorBarMaximum 150.0;
    Float64 colorBarMinimum 0.0;
    String comment "Ocean tide amplitude flags following seadatanet flags";
    String Conventions "SeaDataNet measurand qualifier flags";
    String flag_meanings "no_quality_control good_value probably_good_value probably_bad_value bad_value changed_value value_below_detection value_in_excess interpolated_value missing_value";
    String flag_value "0b, 1b, 2b, 3b, 4b, 5b, 6b, 7b, 8b, 9b";
    String long_name "AMPLITUDE SEADATANET QC";
    String sdn_conventions_urn "SDN:L20::";
  }
 }
  NC_GLOBAL {
    String area "Mediterranean Sea";
    String cdm_data_type "Point";
    String cdm_point_variables "time,latitude,longitude";
    String citation "not yet available";
    String contributor_name "Marina Locritani, Sara Garvani, Giuseppe Manzella, Claudia Fratianni, Antonio Guarnieri, Damiano Delrosso";
    String contributor_role "Researcher, Researcher, Supervisor, Data Curator/Manager, Researcher, Project Leader";
    String contributor_url "orcid.org/0000-0003-2827-5631, orcid.org/0000-0003-4374-3296, orcid.org/0000-0002-7033-1628, orcid.org/0000-0002-4983-4255, orcid.org/0000-0001-8162-6571, orcid.org/0000-0002-3646-9893";
    String Conventions "SeaDataNet_1.0, CF-1.6, COARDS, ACDD-1.3";
    String creator_name "Istituto Nazionale di Geofisica e Vulcanologia, Sede di Bologna (INGV)";
    String creator_url "https://www.ingv.it/";
    String doi "not yet available";
    Float64 Easternmost_Easting 5.534;
    String featureType "Point";
    Float64 geospatial_lat_max 43.214;
    Float64 geospatial_lat_min 43.214;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 5.534;
    Float64 geospatial_lon_min 5.534;
    String geospatial_lon_units "degrees_east";
    String history 
"2024-11-15T08:00:36Z (local files)
2024-11-15T08:00:36Z http://oceano.bo.ingv.it/tabledap/SEALEVEL_PLATE_X_XI_PAGE_26.das";
    String infoUrl "https://www.seadatanet.org/";
    String institution "Istituto Nazionale di Geofisica e Vulcanologia, Sede di Roma2 (INGV)";
    String institution_edmo_code "251";
    String institution_references "www.ingv.it";
    String keywords "above, amplitude, AMPLITUDE_SEADATANET_QC, aslvmstp, ASLVMSTP_SEADATANET_QC, aslvzz01, ASLVZZ01_SEADATANET_QC, calculate, cdi, code, data, datum, directory, earth, Earth Science > Oceans > Sea Surface Topography > Sea Surface Height, earth science>oceans>sea surface topography>sea level> mean sea level, earth science>oceans>tides>tidal height, european, flag, frequency, geofisica, height, histoire, ingv, istituto, l.f, latitude, level, longitude, MACMAP, marine, marsili, mer, nazionale, ocean, oceans, organizations, partner, physique, POSITION_SEADATANET_QC, quality, reported, roma2, science, SDN_EDMO_CODE, sea, sea_surface_height, seadatanet, seawater, sede, specific, surface, tidal, tide, time, TIME_SEADATANET_QC, topography, transformed, vulcanologia, water, water_surface_height_above_a_specific_datum";
    String keywords_vocabulary "GCMD Science Keywords";
    String last_latitude_observation "43.214";
    String last_longitude_observation "5.534";
    String license "Attribution (CC BY 4.0)";
    String netcdf_version "netCDF-4 classic model";
    Float64 Northernmost_Northing 43.214;
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 43.214;
    String standard_name_vocabulary "CF Standard Name Table v70";
    String subsetVariables "SDN_EDMO_CODE, TIME_SEADATANET_QC, longitude, latitude, POSITION_SEADATANET_QC, ASLVZZ01_SEADATANET_QC, ASLVMSTP_SEADATANET_QC, AMPLITUDE_SEADATANET_QC";
    String summary "The Sea Level measurements reported in Histoire Physique de la mer, an historical oceanographic treatise published in 1725 by Luigi Ferdinando Marsili, allowed the reconstruction, in the framework of MACMAP (A Multidisciplinary Analysis of Climate change indicators in the Mediterranean And Polar regions) project, of the M2 tide amplitude at Port of Cassis between 01  January 1707 to 10 April 1707.";
    String time_coverage_end "1707-04-10T00:00:00Z";
    String time_coverage_start "1707-01-05T00:00:00Z";
    String title "Sea Level data reported in Histoire Physique de la mer (1725) of L.F. Marsili and transformed to calculate the M2 tidal amplitude";
    Float64 Westernmost_Easting 5.534;
  }
}

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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.
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(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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