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Dataset Title:  AIS Ship Traffic: Johnston Atoll: 2011-2012 Subscribe RSS
Institution:  University of Hawaii   (Dataset ID: ais_john_20112012)
Range: longitude = -179.3014 to 180.0°E, latitude = -24.99945 to 5.0°N, time = 2011-08-01T00:07:18Z to 2012-08-16T23:58:08Z
Information:  Summary ? | License ? | FGDC | ISO 19115 | Metadata | Background (external link) | 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 {
  obs {
    Int32 actual_range 1, 139235;
    String long_name "observation";
    String short_name "obs";
    String units "0";
  }
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.312157238e+9, 1.345161488e+9;
    String axis "T";
    String ioos_category "Time";
    String long_name "Time";
    String short_name "time";
    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 actual_range -24.99945, 5.0;
    String axis "Y";
    String ioos_category "Location";
    String long_name "Latitude";
    String short_name "lat";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float32 actual_range -179.3014, 180.0;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String short_name "lon";
    String standard_name "longitude";
    String units "degrees_east";
  }
  ship_id_mmsi {
    Int32 actual_range 0, 888888888;
    String ioos_category "Identifier";
    String long_name "ship identification number (MMSI)";
    String short_name "ship_id";
    String units "0";
  }
  navigational_status {
    Int32 actual_range 0, 15;
    Float64 colorBarMaximum 15.0;
    Float64 colorBarMinimum 0.0;
    String flag_meanings "under_way_using_engine at_anchor not_under_command restricted_manoeuvrability constrained_by_her_draught moored aground engaged_in_fishing under_way_sailing reserved_for_future_use reserved_for_future_use reserved_for_future_use reserved_for_future_use reserved_for_future_use AIS_SART_active not_defined";
    Int32 flag_values 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15;
    String ioos_category "Other";
    String long_name "navigational status";
    String short_name "navstat";
    String units "0";
    Int32 valid_range 0, 15;
  }
  speed_over_ground {
    Float32 actual_range 0.0, 1.0;
    Float64 colorBarMaximum 100.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Other";
    String long_name "speed over ground";
    String short_name "sog";
    String standard_name "platform_speed_wrt_ground";
    String units "kts";
  }
  course_over_ground {
    Float32 actual_range 0.0, 4.1;
    Float64 colorBarMaximum 360.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Other";
    String long_name "course over ground";
    String short_name "cog";
    String standard_name "platform_course";
    String units "deg";
  }
  true_heading {
    Float32 actual_range 0.0, 5.0;
    Float64 colorBarMaximum 360.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Other";
    String long_name "true heading";
    String short_name "thead";
    String units "deg";
  }
  rate_of_turn {
    Float32 actual_range -128.0, 127.0;
    Float64 colorBarMaximum 128.0;
    Float64 colorBarMinimum -128.0;
    String ioos_category "Other";
    String long_name "rate of turn";
    String short_name "rot";
    String units "degrees minutes-1";
  }
  position_accuracy {
    Int32 actual_range 0, 1;
    Float64 colorBarMaximum 1.0;
    Float64 colorBarMinimum 0.0;
    String flag_meanings "high_<=_10m low_>_10m";
    Int32 flag_values 0, 1;
    String ioos_category "Other";
    String long_name "position accuracy";
    String short_name "pflag";
    String units "0";
    Int32 valid_range 0, 1;
  }
 }
  NC_GLOBAL {
    String cdm_data_type "Point";
    String Conventions "CF-1.6";
    Float64 Easternmost_Easting 180.0;
    String featureType "Point";
    Float64 geospatial_lat_max 5.0;
    Float64 geospatial_lat_min -24.99945;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 180.0;
    Float64 geospatial_lon_min -179.3014;
    String geospatial_lon_units "degrees_east";
    String history 
"2018-04-27T02:36:49Z http://pacioos.org
2018-04-27T02:36:49Z http://oos.soest.hawaii.edu/tabledap/ais_john_20112012.das";
    String infoUrl "http://www.pacioos.hawaii.edu";
    String institution "University of Hawaii";
    String ISO_Topic_Categories "oceans,transportation";
    String license 
"The data may be used and redistributed for free but is not intended
for legal use, since it may contain inaccuracies. Neither the data
Contributor, ERD, NOAA, nor the United States Government, nor any
of their employees or contractors, makes any warranty, express or
implied, including warranties of merchantability and fitness for a
particular purpose, or assumes any legal liability for the accuracy,
completeness, or usefulness, of this information.";
    Float64 Northernmost_Northing 5.0;
    String sourceUrl "http://pacioos.org";
    Float64 Southernmost_Northing -24.99945;
    String summary "Ship position data from a satellite-based Automatic Identification System (AIS) were obtained jointly by PacIOOS (J. Potemra), SOEST/ORE of the University of Hawaii (E. Roth), and the Papahanaumokuakea Marine National Monument (PNMN) (D. Graham) through a one-time purchase from ORBCOMM LLC. The purchase agreement was made in late 2012 and was for a 30-by-30 degree section of historical AIS data that included the region of the Hawaiian Islands. The data include AIS long and unchecked reports for a one year period: August 2011 through mid-August 2012. The raw, monthly GPS files were locally converted to NetCDF for the PacIOOS data servers. Due to vendor constraints, release of the raw data is limited.";
    String time_coverage_end "2012-08-16T23:58:08Z";
    String time_coverage_start "2011-08-01T00:07:18Z";
    String title "AIS Ship Traffic: Johnston Atoll: 2011-2012";
    Float64 Westernmost_Easting -179.3014;
  }
}

 

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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