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Dataset Title:  Water density data extrapolated by water weight measurements reported in
Histoire Physique de la mer (1725) of L.F. Marsili
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Institution:  Istituto Nazionale di Geofisica e Vulcanologia, Sede di Roma2 (INGV)   (Dataset ID: MARSILI_WATER_DENISTY)
Range: longitude = 3.69 to 5.533°E, latitude = 43.126 to 43.396°N, depth = 0.0 to 0.0m, time = 1706-06-18T00:00:00Z to 1707-01-18T00:00:00Z
Information:  Summary ? | License ? | FGDC | ISO 19115 | Metadata | Background (external link) | Subset | Data Access Form
 
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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:

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";
  }
  station_id {
    String long_name "List of station name";
  }
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range -8.3165184e+9, -8.2980288e+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::";
  }
  depth {
    String _CoordinateAxisType "Height";
    String _CoordinateZisPositive "down";
    Float32 _FillValue -99999.0;
    Float32 actual_range 0.0, 0.0;
    String ancillary_variables "DEPTH_SEADATANET_QC";
    String axis "Z";
    Float64 colorBarMaximum 8000.0;
    Float64 colorBarMinimum -8000.0;
    String colorBarPalette "TopographyDepth";
    String ioos_category "Location";
    String long_name "Depth relative to raw data";
    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 "Metres";
    String sdn_uom_urn "SDN:P06::ULAA";
    String standard_name "depth";
    String units "m";
  }
  DEPTH_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::";
    String standard_name "depth";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float64 actual_range 3.69, 5.533;
    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 43.126, 43.396;
    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::";
  }
  DENSWB01 {
    Float32 _FillValue -99999.0;
    Float32 actual_range 1009.06, 1030.43;
    String ancillary_variables "DENSWB01_SEADATANET_QC";
    Float64 colorBarMaximum 28.0;
    Float64 colorBarMinimum 20.0;
    String comment "Water density data in Kg/m3 were obtained following a sequence of conversions: first, the water weight measurements (ounces, dragme, grains including the weight of the instrument in air) were converted into grains, as indicated in the Preface by Marsili: 1 pound corresponds to 12 ounces, 1 ounce to 8 dragme and 1 dragma to 60 grains. Marsili highlights on Plate IX, page 26, that 6 dragme is equivalent to 360 grains. Then distilled surface water, used by Marsili as reference water and whose weights are given on Table 4 on Plate VIII, page 23 of Histoire Physique de la mer, was converted into gains. Finally, the density was obtained by applying the formula: ρ=1000*P/Pr, where ρ is the density of water in Kg/m3; 1000 is the density of distilled water in Kg/m3; P is the weight of seawater in grains measured by Marsili; Pr is the weight of reference water (distilled water) in grains measured by Marsili. The associated minimum error was ±1,23 Kg/m3.";
    String long_name "Density of the water body by gravimetry";
    String sdn_P02_urn "SDN:P02::SIGT";
    String sdn_parameter_name "Density of the water body by gravimetry";
    String sdn_parameter_urn "SDN:P01::DENSWB01";
    String sdn_uom_name "Kilograms per cubic metre";
    String sdn_uom_urn "SDN:P06::UKMC";
    String standard_name "sea_water_density";
    String units "kilograms per cubic metre";
  }
  DENSWB01_SEADATANET_QC {
    Byte _FillValue -127;
    String _Unsigned "false";
    Byte actual_range 1, 3;
    Float64 colorBarMaximum 150.0;
    Float64 colorBarMinimum 0.0;
    String comment "Raw temperature 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 "DENSWB01 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";
    String contributor_role "Researcher, Researcher, Supervisor, Data Curator/Manager, 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";
    String Conventions "SeaDataNet_1.0, CF-1.6, COARDS, ACDD-1.3";
    String creator_name "Istituto Nazionale di Geofisica e Vulcanologia, Sede di Bologna";
    String creator_url "https://www.ingv.it/";
    String doi "not yet available";
    Float64 Easternmost_Easting 5.533;
    String featureType "Point";
    Float64 geospatial_lat_max 43.396;
    Float64 geospatial_lat_min 43.126;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 5.533;
    Float64 geospatial_lon_min 3.69;
    String geospatial_lon_units "degrees_east";
    Float64 geospatial_vertical_max 0.0;
    Float64 geospatial_vertical_min 0.0;
    String geospatial_vertical_positive "down";
    String geospatial_vertical_units "m";
    String history 
"2024-05-18T15:50:32Z (local files)
2024-05-18T15:50:32Z http://oceano.bo.ingv.it/tabledap/MARSILI_WATER_DENISTY.das";
    String infoUrl "https://www.ingv.it/";
    String institution "Istituto Nazionale di Geofisica e Vulcanologia, Sede di Roma2 (INGV)";
    String institution_edmo_code "251";
    String keywords "body, cdi, code, data, density, denswb01, DENSWB01_SEADATANET_QC, depth, DEPTH_SEADATANET_QC, directory, earth, Earth Science > Oceans > Salinity/Density > Density, earth science>oceans>ocean temperature>ocean temperature profiles, european, extrapolated, flag, geofisica, gravimetry, histoire, ingv, istituto, l.f, latitude, list, longitude, MACMAP, marine, marsili, measurements, mer, name, nazionale, ocean, oceans, organizations, partner, physique, POSITION_SEADATANET_QC, quality, reported, roma2, salinity, science, SDN_EDMO_CODE, sea, sea_water_density, seadatanet, seawater, sede, station, station_id, time, TIME_SEADATANET_QC, vulcanologia, water, weight";
    String keywords_vocabulary "GCMD Science Keywords";
    String last_latitude_observation "43.204";
    String last_longitude_observation "5.514";
    String license "Attribution (CC BY 4.0)";
    String netcdf_version "netCDF-4 classic model";
    Float64 Northernmost_Northing 43.396;
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 43.126;
    String standard_name_vocabulary "CF Standard Name Table v70";
    String subsetVariables "SDN_EDMO_CODE, TIME_SEADATANET_QC, depth, DEPTH_SEADATANET_QC, POSITION_SEADATANET_QC";
    String summary "The water weight measurements reported in Histoire Physique de la mer, a 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 water density collected at different geographic locations in the Golfe du Lion between 18th June 1706 and 18th January 1707";
    String time_coverage_end "1707-01-18T00:00:00Z";
    String time_coverage_start "1706-06-18T00:00:00Z";
    String title "Water density data extrapolated by water weight measurements reported in Histoire Physique de la mer (1725) of L.F. Marsili";
    Float64 Westernmost_Easting 3.69;
  }
}

 

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.

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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