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Dataset Title:  N01 SUNA - Nitrate Observations Corrected   RSS
Institution:  University of Maine School of Marine Sciences   (Dataset ID: N01_corrected_nitrate_csv)
Range: longitude = -65.91473 to -65.91473°E, latitude = 42.32583 to 42.32583°N, depth = 50.0 to 180.0m, time = 2016-07-26T08:45:00Z to 2017-07-15T16:45:00Z
Information:  Summary ? | License ? | FGDC | ISO 19115 | Metadata | Background | 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 {
  station {
    String ioos_category "Identifier";
    String long_name "Station";
  }
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.4695227e+9, 1.5001371e+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";
  }
  Year {
    Int16 actual_range 2016, 2017;
    String ioos_category "Time";
    String long_name "Year";
  }
  Month {
    Byte actual_range 1, 12;
    String ioos_category "Time";
    String long_name "Month";
  }
  Day {
    Byte actual_range 1, 32;
    String ioos_category "Time";
    String long_name "Day";
  }
  Hour {
    Byte actual_range 0, 16;
    String ioos_category "Time";
    String long_name "Hour";
  }
  Minute {
    Byte actual_range 45, 45;
    String ioos_category "Time";
    String long_name "Minute";
  }
  Second {
    Byte actual_range 0, 0;
    String ioos_category "Time";
    String long_name "Second";
  }
  Nitrate_umol {
    Float32 actual_range -0.495, 25.292;
    Float64 colorBarMaximum 50.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Dissolved Nutrients";
    String long_name "Mole Concentration Of Nitrate In Sea Water";
    String standard_name "mole_concentration_of_nitrate_in_sea_water";
    String units "umol";
  }
  Standard_Deviation {
    Float32 actual_range 0.017, 1.273;
    Float64 colorBarMaximum 50.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Statistics";
    String long_name "Standard Deviation(umol)";
  }
  Nitrate {
    Float32 actual_range -4.95e-4, 0.025292;
    Float64 colorBarMaximum 50.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Dissolved Nutrients";
    String long_name "Mole Concentration Of Nitrate In Sea Water";
    String standard_name "mole_concentration_of_nitrate_in_sea_water";
    String units "mol m-3";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float64 actual_range 42.3258302861994, 42.3258302861994;
    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";
    Float64 actual_range -65.9147227894176, -65.9147227894176;
    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";
  }
  mooring_site_desc {
    String ioos_category "Location";
    String long_name "Mooring Site Desc";
  }
  depth {
    String _CoordinateAxisType "Height";
    String _CoordinateZisPositive "down";
    Int16 actual_range 50, 180;
    String axis "Z";
    Float64 colorBarMaximum 8000.0;
    Float64 colorBarMinimum -8000.0;
    String colorBarPalette "TopographyDepth";
    String ioos_category "Location";
    String long_name "Depth";
    String positive "down";
    String standard_name "depth";
    String units "m";
  }
  water_depth {
    Float32 actual_range 225.0, 225.0;
    String ioos_category "Location";
    String long_name "Water Depth";
    String units "m";
  }
 }
  NC_GLOBAL {
    String cdm_data_type "Point";
    String Conventions "COARDS, CF-1.6, ACDD-1.3";
    String creator_email "davidt@maine.edu";
    String creator_name "David Townsend";
    String creator_url "https://umaine.edu/marine/";
    String defaultGraphQuery "time,Nitrate_umol&time%3E=max(time)-7days&depth=50&.draw=lines&.color=0x000000";
    Float64 Easternmost_Easting -65.9147227894176;
    String featureType "Point";
    Float64 geospatial_lat_max 42.3258302861994;
    Float64 geospatial_lat_min 42.3258302861994;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -65.9147227894176;
    Float64 geospatial_lon_min -65.9147227894176;
    String geospatial_lon_units "degrees_east";
    Float64 geospatial_vertical_max 180.0;
    Float64 geospatial_vertical_min 50.0;
    String geospatial_vertical_positive "down";
    String geospatial_vertical_units "m";
    String history 
"2020-05-26T05:18:49Z (local files)
2020-05-26T05:18:49Z http://www.neracoos.org/tabledap/N01_corrected_nitrate_csv.das";
    String infoUrl "http://www.neracoos.org/nutrientobservatory";
    String institution "University of Maine School of Marine Sciences";
    String keywords "buoy, chemistry, concentration, data, day, depth, desc, deviation, dissolved, dissolved nutrients, e01, earth, Earth Science > Oceans > Ocean Chemistry > Nitrate, hour, identifier, latitude, longitude, maine, minute, mole, mole_concentration_of_nitrate_in_sea_water, month, mooring, mooring_site_desc, n02, nitrate, Nitrate_moles_m_3, Nitrate_umol, no3, nutrients, ocean, oceans, science, sea, seawater, second, site, standard, Standard_Deviation, station, statistics, suna, time, two, umol, university, water, water_depth, year";
    String keywords_vocabulary "GCMD Science Keywords";
    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.";
    String neracoos_data_provider "UMO";
    Float64 Northernmost_Northing 42.3258302861994;
    String publisher_email "info@neracoos.org";
    String publisher_name "Northeastern Regional Association of Coastal and Ocean Observing Systems (NERACOOS)";
    String publisher_phone "(603) 319-1785";
    String publisher_url "http://www.neracoos.org/";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 42.3258302861994;
    String standard_name_vocabulary "CF Standard Name Table v29";
    String subsetVariables "Year, depth";
    String summary "One SUNA V2 and two ISUS (Sea-Bird Scientific) were deployed on NERACOOS Buoy N (Latitude: 42 deg 19.48'N and Longitude: 65 deg 54.55'W) at 50m, 100m and 180m, respectively, from July 26, 2016 to July 15, 2017. This corresponds to University of Maine buoy deployment N0120 (http://gyre.umeoce.maine.edu/data/gomoos/buoy/html/N01.html). The sensors were programmed to collect nitrate measurements three times per day (0045, 0845 and 1645 GMT) over a fixed sampling window of 30 seconds at approximately 1.4 readings per second. Five measurements recorded in the middle of the 30 second data stream were transmitted back to the University of Maine Physical Oceanography Group via cell phone. The mean concentration and standard deviation were calculated for each specific sampling time. If the standard deviation for a mean was greater than 2uM, the values were eliminated. Surviving data were then quality controlled (QCed) by removing outliers assessed as values less than -0.5uM and greater than 30uM.  At the time of buoy deployment, a standard CTD cast was conducted with a carrousel water sampler equipped with Niskin bottles. Ground truth water samples were collected at the same depth as the nitrate sensors. These samples were analyzed for nitrate concentrations at the University of Maine using a Bran Luebbe AA3 Autoanalyzer and standard techniques. Ground truth corrections were added or subtracted as an offset only if the difference between the nitrate concentration of the water sample collected and the mean nitrate sensor reading at approximately the same time was greater than 2 uM. Upon recovery of the instruments, the data was processed using the software provided by Sea-Bird (UCI and ISUS.com) and compared with the real-time measurements as a check for accuracy. In the event that the sensor was not able to transmit in real-time, the processed data was QCed. Please contact David Townsend, University of Maine, School of Marine Sciences if you have any questions.";
    String testOutOfDate "now-121days";
    String time_coverage_end "2017-07-15T16:45:00Z";
    String time_coverage_start "2016-07-26T08:45:00Z";
    String title "N01 SUNA - Nitrate Observations Corrected";
    Float64 Westernmost_Easting -65.9147227894176;
  }
}

 

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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