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Dataset Title:  SPI - Reconstructed sea state using ship motion data recorded during the
Antarctic Circumnavigation Expedition (ACE).
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Institution:  Department of Infrastructure Engineering, The University of Melbourne, 3010, Melbourne, VIC, Australia   (Dataset ID: SPI_10_5281_zenodo_4541563)
Range: longitude = 0.625406 to 359.38934°E, latitude = -72.59164 to 29.711182°N, time = 2016-11-27T10:04:58Z to 2017-03-17T23:54:58Z
Information:  Summary ? | License ? | FGDC | ISO 19115 | Metadata | Background (external link) | Data Access Form
 
Graph Type:  ?
X Axis: 
Y Axis: 
Color: 
-1+1
 
Constraints ? Optional
Constraint #1 ?
Optional
Constraint #2 ?
       
       
       
       
       
 
Server-side Functions ?
 distinct() ?
? ("Hover here to see a list of options. Click on an option to select it.Hover here to see a list of options. Click on an option to select it.Hover here to see a list of options. Click on an option to select it.Hover here to see a list of options. Click on an option to select it.")
 
Graph Settings
Marker Type:   Size: 
Color: 
Color Bar:   Continuity:   Scale: 
   Minimum:   Maximum:   N Sections: 
Draw land mask: 
Y Axis Minimum:   Maximum:   
 
(Please be patient. It may take a while to get the data.)
 
Optional:
Then set the File Type: (File Type information)
and
or view the URL:
(Documentation / Bypass this form ? )
    Click on the map to specify a new center point. ?
Zoom: 
Time range:    |<   -       
[The graph you specified. Please be patient.]

 

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 {
  time {
    Int32 _ChunkSizes 512;
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.480241098e+9, 1.489794898e+9;
    String axis "T";
    String description "time";
    String ioos_category "Time";
    String long_name "Time";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String units "seconds since 1970-01-01T00:00:00Z";
    String x_spi_emodnet_visualise_variable "False";
  }
  latitude {
    Int32 _ChunkSizes 512;
    String _CoordinateAxisType "Lat";
    Float64 actual_range -72.59164, 29.711182;
    String attribute "Latitude of the vessel at the time of the end of the averaging period";
    String axis "Y";
    String description "Latitude of the vessel at the time of the end of the averaging period [degree_north]";
    String ioos_category "Location";
    String long_name "Latitude";
    String spi_original_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
    String x_spi_emodnet_visualise_variable "True";
  }
  longitude {
    Int32 _ChunkSizes 512;
    String _CoordinateAxisType "Lon";
    Float64 actual_range 0.625406, 359.389355;
    String attribute "Longitude of the vessel at the time of the end of the averaging period";
    String axis "X";
    String description "Longitude of the vessel at the time of the end of the averaging period [degree_east]";
    String ioos_category "Location";
    String long_name "Longitude";
    String spi_original_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
    String x_spi_emodnet_visualise_variable "True";
  }
  sea_surface_wave_significant_height {
    Int32 _ChunkSizes 512;
    Float64 actual_range 0.097031, 6.465441;
    String description "Significant wave height [m]";
    String spi_original_name "Hs";
    String standard_name "sea_surface_wave_significant_height";
    String units "m";
    String x_spi_emodnet_visualise_variable "True";
  }
  sea_surface_wave_period_at_variance_spectral_density_maximum {
    Int32 _ChunkSizes 512;
    Float64 actual_range 4.305257, 15.058824;
    String description "Peak wave period [s]";
    String spi_original_name "Tp";
    String standard_name "sea_surface_wave_period_at_variance_spectral_density_maximum";
    String units "s";
    String x_spi_emodnet_visualise_variable "True";
  }
  sea_surface_wave_mean_period_from_variance_spectral_density_inverse_frequency_moment {
    Int32 _ChunkSizes 512;
    Float64 actual_range 6.227044, 13.529391;
    String description "Mean Wave period based on the moment of order-1 [s]";
    String spi_original_name "Tm1";
    String standard_name "sea_surface_wave_mean_period_from_variance_spectral_density_inverse_frequency_moment";
    String units "s";
    String x_spi_emodnet_visualise_variable "True";
  }
  sea_surface_wave_mean_period_from_variance_spectral_density_first_frequency_moment {
    Int32 _ChunkSizes 512;
    Float64 actual_range 5.983175, 12.711772;
    String description "Mean Wave period based on the first moment [s]";
    String spi_original_name "T1";
    String standard_name "sea_surface_wave_mean_period_from_variance_spectral_density_first_frequency_moment";
    String units "s";
    String x_spi_emodnet_visualise_variable "True";
  }
  sea_surface_wave_mean_period_from_variance_spectral_density_second_frequency_moment {
    Int32 _ChunkSizes 512;
    Float64 actual_range 5.788674, 12.318304;
    String description "Mean Wave period based on the second moment [s]";
    String spi_original_name "T2";
    String standard_name "sea_surface_wave_mean_period_from_variance_spectral_density_second_frequency_moment";
    String units "s";
    String x_spi_emodnet_visualise_variable "True";
  }
 }
  NC_GLOBAL {
    String cdm_data_type "Other";
    String citation "Derkani, M.H., Nelli, F., Alberello, A. and Toffoli, A. (2021). Reconstructed sea state using ship motion data recorded during the Antarctic Circumnavigation Expedition (ACE). (Version 1.0) [Data set]. Zenodo. https://doi.org/10.5281/zenodo.4541564";
    String contributors "[{'title': 'Marzieh H. Derkani', 'path': 'https://orcid.org/0000-0001-7989-2192', 'email': 'marzieh.h.derkani@gmail.com', 'role': 'author', 'organisation': 'Department of Infrastructure Engineering, The University of Melbourne, 3010, Melbourne, VIC, Australia'}, {'title': 'Filippo Nelli', 'path': 'https://orcid.org/0000-0003-4206-8516', 'role': 'author', 'organisation': 'Department of Infrastructure Engineering, The University of Melbourne, 3010, Melbourne, VIC, Australia'}, {'title': 'Alberto Alberello', 'path': 'https://orcid.org/', 'role': 'author', 'organisation': 'Graduate School of Frontier Sciences, The University of Tokyo, 277-8561, Kashiwa, Chiba, Japan'}, {'title': 'Alessandro Toffoli', 'path': 'https://orcid.org/', 'email': 'toffoli.alessandro@gmail.com', 'role': 'author', 'organisation': 'Department of Infrastructure Engineering, The University of Melbourne, 3010, Melbourne, VIC, Australia'}, {'title': 'Jen Thomas', 'path': 'https://orcid.org/0000-0002-5986-7026', 'email': 'jen@falciot.net', 'role': 'publisher', 'organisation': 'Swiss Polar Institute, Switzerland'}]";
    String Conventions "COARDS, CF-1.6, ACDD-1.3";
    String creator_name "Marzieh H. Derkani";
    String creator_type "institution";
    String creator_url "https://orcid.org/0000-0001-7989-2192";
    String dataset_date_created "2021-03-08";
    String DOI "https://doi.org/10.5281/zenodo.4541564";
    Float64 Easternmost_Easting 359.389355;
    Float64 geospatial_lat_max 29.711182;
    Float64 geospatial_lat_min -72.59164;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 359.389355;
    Float64 geospatial_lon_min 0.625406;
    String geospatial_lon_units "degrees_east";
    String history 
"2021-06-16T10:52:40Z (local files)
2021-06-16T10:52:40Z https://erddap.emodnet-physics.eu/tabledap/SPI_10_5281_zenodo_4541563.das";
    String infoUrl "https://doi.org/10.5281/zenodo.4541564";
    String institution "Department of Infrastructure Engineering, The University of Melbourne, 3010, Melbourne, VIC, Australia";
    String keywords "ACE, Antarctic Circumnavigation Expedition, sea state, ship motion, Southern Ocean";
    String license "CC-BY-4.0";
    Float64 Northernmost_Northing 29.711182;
    String platform_code "UBXH3_ACE_4541563";
    String platform_name "R/V Akademik Tryoshnikov";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing -72.59164;
    String standard_name_vocabulary "CF Standard Name Table v55";
    String summary "The Antarctic Circumnavigation Expedition (ACE) took place aboard the Russian icebreaker, Akademik Tryoshnikov, from December 2016 to March 2017. Throughout the expedition, the ship's motion was recorded with an Inertial Measurement Unit (IMU) at a sampling rate of 1 Hz. The sea state is reconstructed based on the ship's motion relying on the principle that the vessel is a rigid body with six degrees of freedom that moves in response to the incident wave field and restoring forces. The relation between the ship's motion and the wave field is evaluated via the response amplitude operator R(f), i.e. a ship-specific function that translates the motion spectrum into the wave spectrum. Motion spectra were evaluated by applying a Discrete Fourier Transform to 5-minute time series of heave motion. An approximation of R(f) for the Akademik Tryoshnikov was calculated solving the equation of motion with a model based on the boundary element method.";
    String time_coverage_end "2017-03-17T23:54:58Z";
    String time_coverage_start "2016-11-27T10:04:58Z";
    String title "SPI - Reconstructed sea state using ship motion data recorded during the Antarctic Circumnavigation Expedition (ACE).";
    String type "ferrybox/ship";
    Float64 Westernmost_Easting 0.625406;
  }
}

 

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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