ERDDAP > tabledap > Data Access Form

Dataset Title:	Maria Mitchell Association Nantucket Harbor Buoy
Institution:	Maria Mitchell Association   (Dataset ID: MMA_XYLEM_NANTUCKET)
Information:	Summary | License | FGDC | ISO 19115 | Metadata | Background | Subset | Files | Make a graph

 

Variable	Optional Constraint #1		Optional Constraint #2		Minimum    or a List of Values	Maximum
time (UTC)	!= =~ <= >= = < >		!= =~ <= >= = < >		2025-08-01T00:00:26Z	2025-10-20T23:45:00Z
station_name	!= =~ <= >= = < >		!= =~ <= >= = < >		"Nantucket Harbor"	"Nantucket Harbor"
latitude (degrees_north)	!= =~ <= >= = < >		!= =~ <= >= = < >		41.290746
longitude (degrees_east)	!= =~ <= >= = < >		!= =~ <= >= = < >		-70.084979
dark_spectrum_average	!= =~ <= >= = < >		!= =~ <= >= = < >		-999.9	844.0
light_spectrum_average	!= =~ <= >= = < >		!= =~ <= >= = < >		-999.9	17521.0
nitrogen (mgN/L)	!= =~ <= >= = < >		!= =~ <= >= = < >		-999.9	0.105
nitrate (uM)	!= =~ <= >= = < >		!= =~ <= >= = < >		-999.9	7.53
chlorophyll_rfu (Chlorophyll, RFU)	!= =~ <= >= = < >		!= =~ <= >= = < >		-999.9	59.94
depth (m)	!= =~ <= >= = < >		!= =~ <= >= = < >		-999.9	0.925
chlorophyll_ugL (Chlorophyll, ug/L)	!= =~ <= >= = < >		!= =~ <= >= = < >		-999.9	239.57
pH	!= =~ <= >= = < >		!= =~ <= >= = < >		-999.9	8.19
dissolved_oxygen_percent (percent)	!= =~ <= >= = < >		!= =~ <= >= = < >		-999.9	130.86
dissolved_oxygen_mgL (mg/L)	!= =~ <= >= = < >		!= =~ <= >= = < >		-999.9	9.63
specific_conductivity (uS/cm)	!= =~ <= >= = < >		!= =~ <= >= = < >		-999.9	49721.7
phycoerythrin_ugL (Phycoerythrin, ug/L)	!= =~ <= >= = < >		!= =~ <= >= = < >		-999.9	302.06
phycoerythrin_rfu (Phycoerythrin, RFU)	!= =~ <= >= = < >		!= =~ <= >= = < >		-999.9	108.46
temperature (degree_C)	!= =~ <= >= = < >		!= =~ <= >= = < >		-999.9	25.377
pH_mV (pH, mV)	!= =~ <= >= = < >		!= =~ <= >= = < >		-999.9	0.0
salinity (PSU)	!= =~ <= >= = < >		!= =~ <= >= = < >		-999.9	32.58

 

Server-side Functions

distinct()

orderBy orderByDescending orderByClosest orderByCount orderByLimit orderByMax orderByMin orderByMinMax orderByMean orderBySum (" time station_name latitude longitude dark_spectrum_average light_spectrum_average nitrogen nitrate chlorophyll_rfu depth chlorophyll_ugL pH dissolved_oxygen_percent dissolved_oxygen_mgL specific_conductivity phycoerythrin_ugL phycoerythrin_rfu temperature pH_mV salinity time station_name latitude longitude dark_spectrum_average light_spectrum_average nitrogen nitrate chlorophyll_rfu depth chlorophyll_ugL pH dissolved_oxygen_percent dissolved_oxygen_mgL specific_conductivity phycoerythrin_ugL phycoerythrin_rfu temperature pH_mV salinity time station_name latitude longitude dark_spectrum_average light_spectrum_average nitrogen nitrate chlorophyll_rfu depth chlorophyll_ugL pH dissolved_oxygen_percent dissolved_oxygen_mgL specific_conductivity phycoerythrin_ugL phycoerythrin_rfu temperature pH_mV salinity time station_name latitude longitude dark_spectrum_average light_spectrum_average nitrogen nitrate chlorophyll_rfu depth chlorophyll_ugL pH dissolved_oxygen_percent dissolved_oxygen_mgL specific_conductivity phycoerythrin_ugL phycoerythrin_rfu temperature pH_mV salinity time station_name latitude longitude dark_spectrum_average light_spectrum_average nitrogen nitrate chlorophyll_rfu depth chlorophyll_ugL pH dissolved_oxygen_percent dissolved_oxygen_mgL specific_conductivity phycoerythrin_ugL phycoerythrin_rfu temperature pH_mV salinity ")

File type: (more information) .asc - View OPeNDAP-style ISO-8859-1 comma-separated text. .croissant - Download the dataset croissant schema. .csv - Download a ISO-8859-1 comma-separated text table (line 1: names; line 2: units; ISO 8601 times). .csv0 - Download a ISO-8859-1 .csv file without column names or units. Times are ISO 8601 strings. .csvp - Download a ISO-8859-1 .csv file with line 1: name (units). Times are ISO 8601 strings. .das - View the dataset's metadata via an ISO-8859-1 OPeNDAP Dataset Attribute Structure (DAS). .dataTable - A JSON file formatted for use with the Google Visualization client library (Google Charts). .dds - View the dataset's structure via an ISO-8859-1 OPeNDAP Dataset Descriptor Structure (DDS). .dods - OPeNDAP clients use this to download the data in the DODS binary format. .esriCsv - Download a ISO_8859_1 .csv file for ESRI's ArcGIS 9.x and below (separate date and time columns). .fgdc - View the dataset's UTF-8 FGDC .xml metadata. .geoJson - Download longitude,latitude,otherColumns data as a UTF-8 GeoJSON .json file. .htmlTable - View a UTF-8 .html web page with the data in a table. Times are ISO 8601 strings. .iso19115 - View the dataset's ISO 19115/19139 UTF-8 .xml metadata using the version default for this server. .iso19115_2 - View the dataset's ISO 19115-2/19139 UTF-8 .xml metadata. .iso19115_3_2016 - View the dataset's ISO 19115-3:2016 UTF-8 .xml metadata. .iso19139_2007 - View the dataset's ISO 19139:2007 UTF-8 .xml metadata. .itx - Download an ISO-8859-1 Igor Text File. Each response column becomes a wave. .json - View a table-like UTF-8 JSON file (missing value = 'null'; times are ISO 8601 strings). .jsonlCSV - View a UTF-8 JSON Lines CSV file without column names (mv = 'null'; times are ISO 8601 strings). .jsonlCSV1 - View a UTF-8 JSON Lines CSV file with column names on line 1 (mv = 'null'; times are ISO 8601 strings). .jsonlKVP - View a UTF-8 JSON Lines file with Key:Value pairs (missing value = 'null'; times are ISO 8601 strings). .mat - Download a MATLAB binary file. .nc - Download a flat, table-like, NetCDF-3 binary file with COARDS/CF/ACDD metadata. .ncCF - Download a NetCDF-3 CF Discrete Sampling Geometries file (Contiguous Ragged Array). .ncCFHeader - View the UTF-8 header (the metadata) for the .ncCF file. .ncCFMA - Download a NetCDF-3 CF Discrete Sampling Geometries file (Multidimensional Array). .ncCFMAHeader - View the UTF-8 header (the metadata) for the .ncCFMA file. .ncHeader - View the UTF-8 header (the metadata) for the NetCDF-3 .nc file. .nccsv - Download a NetCDF-3-like 7-bit ASCII NCCSV .csv file with COARDS/CF/ACDD metadata. .nccsvMetadata - View the dataset's metadata as the top half of a 7-bit ASCII NCCSV .csv file. .ncoJson - Download a UTF-8 NCO lvl=2 JSON file with COARDS/CF/ACDD metadata. .odvTxt - Download longitude,latitude,time,otherColumns as an ISO-8859-1 ODV Generic Spreadsheet File (.txt). .parquet - Download as a parquet file. Metadata contains column names ("column_names") and units ("column_units"). .parquetWMeta - Download as a parquet file with detailed metadata. .tsv - Download a ISO-8859-1 tab-separated text table (line 1: names; line 2: units; ISO 8601 times). .tsv0 - Download a ISO-8859-1 .tsv file without column names or units. Times are ISO 8601 strings. .tsvp - Download a ISO-8859-1 .tsv file with line 1: name (units). Times are ISO 8601 strings. .wav - Download a .wav audio file. All columns must be numeric and of the same type. .xhtml - View a UTF-8 XHTML (XML) file with the data in a table. Times are ISO 8601 strings. .kml - View a .kml file, suitable for Google Earth. .largePdf - View a large .pdf image file with a graph or map. .largePng - View a large .png image file with a graph or map. .pdf - View a standard, medium-sized .pdf image file with a graph or map. .png - View a standard, medium-sized .png image file with a graph or map. .smallPdf - View a small .pdf image file with a graph or map. .smallPng - View a small .png image file with a graph or map. .transparentPng - View a .png image file (just the data, without axes, landmask, or legend).

(Documentation / Bypass this form )
 
Submit (Please be patient. It may take a while to get the data.)

 

---

The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.754006426e+9, 1.7610039e+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 time_precision "1970-01-01T00:00:00Z";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  station_name {
    String cf_role "timeseries_id";
    String ioos_category "Identifier";
    String long_name "Station Name";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float64 actual_range 41.290746, 41.290746;
    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 -70.084979, -70.084979;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  dark_spectrum_average {
    Float64 actual_range -999.9, 844.0;
    String ioos_category "Other";
    String long_name "Dark Spectrum Average";
  }
  light_spectrum_average {
    Float64 actual_range -999.9, 17521.0;
    String ioos_category "Other";
    String long_name "Light Spectrum Average";
  }
  nitrogen {
    Float64 actual_range -999.9, 0.105;
    String ioos_category "Nutrients";
    String long_name "Nitrogen";
    String units "mgN/L";
  }
  nitrate {
    Float64 actual_range -999.9, 7.53;
    String ioos_category "Nutrients";
    String long_name "Nitrate";
    String standard_name "mole_concentration_of_nitrate_in_sea_water";
    String units "uM";
  }
  chlorophyll_rfu {
    Float64 actual_range -999.9, 59.94;
    String ioos_category "Chlorophyll";
    String long_name "Chlorophyll";
    String units "RFU";
  }
  depth {
    String _CoordinateAxisType "Height";
    String _CoordinateZisPositive "down";
    Float64 actual_range -999.9, 0.925;
    String axis "Z";
    String ioos_category "Location";
    String long_name "Depth";
    String positive "down";
    String standard_name "depth";
    String units "m";
  }
  chlorophyll_ugL {
    Float64 actual_range -999.9, 239.57;
    String ioos_category "Chlorophyll";
    String long_name "Chlorophyll";
    String standard_name "concentration_of_chlorophyll_in_sea_water";
    String units "ug/L";
  }
  pH {
    Float64 actual_range -999.9, 8.19;
    String ioos_category "Other";
    String long_name "pH";
    String standard_name "sea_water_ph_reported_on_total_scale";
  }
  dissolved_oxygen_percent {
    Float64 actual_range -999.9, 130.86;
    String ioos_category "Dissolved Oxygen";
    String long_name "Dissolved Oxygen";
    String standard_name "fractional_saturation_of_oxygen_in_sea_water";
    String units "percent";
  }
  dissolved_oxygen_mgL {
    Float64 actual_range -999.9, 9.63;
    String ioos_category "Dissolved Oxygen";
    String long_name "Dissolved Oxygen";
    String standard_name "mass_concentration_of_oxygen_in_sea_water";
    String units "mg/L";
  }
  specific_conductivity {
    Float64 actual_range -999.9, 49721.7;
    String ioos_category "Other";
    String long_name "Specific Conductivity";
    String standard_name "sea_water_electrical_conductivity";
    String units "uS/cm";
  }
  phycoerythrin_ugL {
    Float64 actual_range -999.9, 302.06;
    String ioos_category "Other";
    String long_name "Phycoerythrin";
    String units "ug/L";
  }
  phycoerythrin_rfu {
    Float64 actual_range -999.9, 108.46;
    String ioos_category "Other";
    String long_name "Phycoerythrin";
    String units "RFU";
  }
  temperature {
    Float64 actual_range -999.9, 25.377;
    String ioos_category "Temperature";
    String long_name "Temperature";
    String standard_name "sea_water_temperature";
    String units "degree_C";
  }
  pH_mV {
    Float64 actual_range -999.9, 0.0;
    String ioos_category "Other";
    String long_name "pH";
    String units "mV";
  }
  salinity {
    Float64 actual_range -999.9, 32.58;
    String ioos_category "Salinity";
    String long_name "Salinity";
    String standard_name "sea_water_practical_salinity";
    String units "PSU";
  }
 }
  NC_GLOBAL {
    String cdm_data_type "TimeSeries";
    String cdm_timeseries_variables "latitude, longitude, station_name";
    String citation "Maria Mitchell Association";
    String Conventions "CF-1.10, ACDD-1.3, IOOS-1.2, COARDS";
    String creator_country "United States";
    String creator_email "sherman@bennington.edu";
    String creator_name "Maria Mitchell Association";
    String creator_type "organization";
    String creator_url "https://www.mariamitchell.org/";
    Float64 Easternmost_Easting -70.084979;
    String featureType "TimeSeries";
    Float64 geospatial_lat_max 41.290746;
    Float64 geospatial_lat_min 41.290746;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -70.084979;
    Float64 geospatial_lon_min -70.084979;
    String geospatial_lon_units "degrees_east";
    Float64 geospatial_vertical_max 0.925;
    Float64 geospatial_vertical_min -999.9;
    String geospatial_vertical_positive "down";
    String geospatial_vertical_units "m";
    String gts_ingest "true";
    String history 
"2026-04-25T12:36:48Z Data are served via Xylem HydroSphere (Xylem Cloud) Data Export API; access requires authentication.
2026-04-25T12:36:48Z http://data.neracoos.org/erddap/tabledap/MMA_XYLEM_NANTUCKET.html";
    String infoUrl "https://cloud.xylem.com/xcloud/dataexportapidocs/public/docs/swagger-ui/index.html#/";
    String institution "Maria Mitchell Association";
    String ioos_regional_association "NERACOOS";
    String ioos_regional_association_url "https://neracoos.org/";
    String keywords "chlorophyll, dissolved oxygen, mma, nantucket, nitrate, ph, salinity, temperature, water quality, xylem";
    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 41.290746;
    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 "Data are served via Xylem HydroSphere (Xylem Cloud) Data Export API; access requires authentication.";
    Float64 Southernmost_Northing 41.290746;
    String standard_name_vocabulary "CF Standard Name Table v70";
    String subsetVariables "longitude, latitude";
    String summary "High-frequency water quality measurements from a moored buoy in Nantucket Harbor, including temperature, dissolved oxygen, salinity, pH, chlorophyll, and nitrate (reported as both µM and mg N/L). Data are collected at approximately 15-minute intervals to characterize environmental conditions and organism exposure.";
    String time_coverage_end "2025-10-20T23:45:00Z";
    String time_coverage_start "2025-08-01T00:00:26Z";
    String title "Maria Mitchell Association Nantucket Harbor Buoy";
    Float64 Westernmost_Easting -70.084979;
  }
}

 

---

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 Data Access Protocol (DAP) and its selection constraints.

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.

 

---

ERDDAP, Version 2.30.0
Disclaimers | Privacy Policy | Contact