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Dataset Title:	Hampton Harbor, NH Tide Gauge
Institution:	Onset Hobolink (Dataset ID: ONSET_hamptonbay_hourly_water_level)
Range:	longitude = -70.8185 to -70.8185°E, latitude = 42.9001 to 42.9001°N, time = 2022-07-06T22:36:00Z to 2024-09-16T17:54:00Z
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Data Access Form \| Files

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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:

Web page authors can embed a graph of the latest data in a web page using HTML <img> tags.
Anyone can use ERDDAPs Slide Sorter to build a personal web page that displays graphs with the latest data (or other images or HTML content), each in its own, draggable slide.

The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  Station {
    String ioos_category "Identifier";
    String long_name "Station";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float32 actual_range 42.9001, 42.9001;
    String axis "Y";
    Float64 colorBarMaximum 90.0;
    Float64 colorBarMinimum -90.0;
    String ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float32 actual_range -70.8185, -70.8185;
    String axis "X";
    Float64 colorBarMaximum 180.0;
    Float64 colorBarMinimum -180.0;
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.65714696e+9, 1.72650924e+9;
    String axis "T";
    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";
  }
  Temp {
    Float64 actual_range 2.02, 21.37;
    String ioos_category "Temperature";
    String long_name "Temperature";
    String units "celsius";
  }
  MLLW_feet {
    Float64 actual_range -6.911700000000001, 17.575100000000003;
    String ioos_category "Unknown";
    String long_name "Mean Lower Low Level feet";
    String units "feet";
  }
  MLLW_meter {
    Float64 actual_range -2.10668616, 5.3568904800000015;
    String ioos_category "Unknown";
    String long_name "Mean Low Low Water meters";
    String units "m";
  }
  MSL {
    Float64 actual_range -3.4146861600000005, 4.048890480000002;
    String ioos_category "Unknown";
    String long_name "Mean Sea Level";
    String units "m";
  }
  MLLW_meter_qartod_gross_range_test {
    Int32 actual_range 1, 4;
    String flag_meanings "\"PASS NOT_EVALUATED SUSPECT FAIL MISSING\"";
    String flag_values "1, 2, 3, 4, 9";
    String ioos_category "quality";
    String long_name "MLLW Meter Qartod Gross Range Test Flag";
    String standard_name "mllw_meter_qartod_gross_range_test_flag";
  }
  MLLW_meter_qartod_spike_test {
    Int32 actual_range 1, 4;
    String flag_meanings "\"PASS NOT_EVALUATED SUSPECT FAIL MISSING\"";
    String flag_values "1, 2, 3, 4, 9";
    String ioos_category "quality";
    String long_name "QARTOD MLLW Meter Spike Test Flag";
    String standard_name "mllw_meter_spike_test_flag";
  }
  MLLW_meter_qartod_flat_line_test {
    Int32 actual_range 1, 1;
    String flag_meanings "\"PASS NOT_EVALUATED SUSPECT FAIL MISSING\"";
    String flag_values "1, 2, 3, 4, 9";
    String ioos_category "quality";
    String long_name "QARTOD MLLW Meter Flat Line Test Flag";
    String standard_name "mllw_meter_flat_line_test_flag";
  }
  MLLW_meter_qartod_rate_of_change_test {
    Int32 actual_range 1, 3;
    String flag_meanings "\"PASS NOT_EVALUATED SUSPECT FAIL MISSING\"";
    String flag_values "1, 2, 3, 4, 9";
    String ioos_category "quality";
    String long_name "QARTOD MLLW Meter Rate of Change Test Flag";
    String standard_name "mllw_meter_rate_of_change_test_flag";
  }
  qartod_aggregate {
    Int32 actual_range 1, 4;
    String flag_meanings "\"PASS NOT_EVALUATED SUSPECT FAIL MISSING\"";
    String flag_values "1, 2, 3, 4, 9";
    String ioos_category "quality";
    String long_name "QARTOD Aggregate Flag";
    String standard_name "aggregate_quality_flag";
  }
 }
  NC_GLOBAL {
    String cdm_data_type "Point";
    String Conventions "COARDS, CF-1.6, ACDD-1.3";
    String creator_email "Francesco.Peri@umb.edu";
    String creator_name "Onset Hobolink";
    String creator_type "institution";
    String creator_url "http://hobolink.com";
    Float64 Easternmost_Easting -70.8185;
    String featureType "Point";
    Float64 geospatial_lat_max 42.9001;
    Float64 geospatial_lat_min 42.9001;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -70.8185;
    Float64 geospatial_lon_min -70.8185;
    String geospatial_lon_units "degrees_east";
    String history 
"2024-09-16T20:12:33Z (local files)
2024-09-16T20:12:33Z http://data.neracoos.org/tabledap/ONSET_hamptonbay_hourly_water_level.das";
    String infoUrl "http://hobolink.com";
    String institution "Onset Hobolink";
    String keywords "gauge, hampton, hobolink, mean, meter, mllw, MLLW_feet, MLLW_meter, msl, onset, sea, station, Temp, temperature, tide, water level";
    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 42.9001;
    String project "NERACOOS";
    String project_url "http://www.neracoos.org";
    String publisher_email "info@neracoos.org";
    String publisher_phone "(603) 319 1785";
    String publisher_url "http://www.neracoos.org";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 42.9001;
    String standard_name_vocabulary "CF Standard Name Table v29";
    String summary 
"Tide gauge located in Hampton Harbor, NH. Funded by NERACOOS. Data is
        reported in elevation above MLLW (NAVD88) in feet and also converted to meters. NOAA uses
        Mean Lower Low Water (MLLW), which is the average height of the lowest tide recorded at a
        tide station each day during a 19-year recording period, known as the National Tidal Datum
        Epoch.[5] MLLW is only a mean, so some tidal levels may be negative relative to MLLW; see
        also mean low water spring. The 19-year recording period is the nearest full year count to
        the 18.6-year cycle of the lunar node regression, which has an effect on tides. At this
        location Mean Sea Level (MSL) is 1.308 meters above MLLW Benchmark used: NOAA Station ID:
        8440452 - PLUM ISLAND, MERRIMACK RIVER ENTRANCE (with extrapolated estimate) MSL meters =
        (MLLW ft. * 0.3048) + GAUGE location correction.";
    String testOutOfDate "now-1day";
    String time_coverage_end "2024-09-16T17:54:00Z";
    String time_coverage_start "2022-07-06T22:36:00Z";
    String title "Hampton Harbor, NH Tide Gauge";
    Float64 Westernmost_Easting -70.8185;
  }
}

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.

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