Data Access Form

Dataset Title:	MBAY_LT - 4081-a_d1
Institution:	Coastal and Marine Hazards and Resources Program, U.S. Geological Survey (Dataset ID: MBAY_LT_4081_a_d1_nc)
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Subset \| Files \| Make a graph

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Variable

Optional
Constraint #1

Optional
Constraint #2

Minimum

or a List of Values

Maximum

station_id

feature_type_instance

"4081-a_d1"

latitude (sensor latitude, degrees_north)

42.37683

longitude (sensor longitude, degrees_east)

-70.78267

crs

-2147483647

platform

-2147483647

time (time of measurement, UTC)

1992-10-21T16:31:52Z

1993-02-18T18:16:52Z

z (m)

-5.0

T_20 (degree_Celsius)

1.718079

11.6322

Server-side Functions

distinct()

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File type: (more information)

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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  station_id {
    String actual_range 
"MBAY_LT_4081_a_d1_nc
MBAY_LT_4081_a_d1_nc";
    String cf_role "timeseries_id";
    String ioos_category "Identifier";
    String long_name "Station ID";
  }
  feature_type_instance {
    String ioos_category "Identifier";
    String long_name "Identifier for each feature type instance";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float32 actual_range 42.37683, 42.37683;
    String axis "Y";
    String ioos_category "Location";
    String long_name "sensor latitude";
    String standard_name "latitude";
    String units "degrees_north";
    Float32 valid_max 42.376835;
    Float32 valid_min 42.376835;
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float32 actual_range -70.78267, -70.78267;
    String axis "X";
    String ioos_category "Location";
    String long_name "sensor longitude";
    String standard_name "longitude";
    String units "degrees_east";
    Float32 valid_max -70.78267;
    Float32 valid_min -70.78267;
  }
  crs {
    Int32 actual_range -2147483647, -2147483647;
    String epsg_code "EPSG:4326";
    String grid_mapping_name "latitude_longitude";
    Float64 inverse_flattening 298.257223563;
    String ioos_category "Identifier";
    String long_name "http://www.opengis.net/def/crs/EPSG/0/4326";
    Float64 semi_major_axis 6378137.0;
  }
  platform {
    Int32 actual_range -2147483647, -2147483647;
    String definition "http://mmisw.org/ont/ioos/definition/stationID";
    String ioos_category "Identifier";
    String ioos_code "4081-a_d1";
    String long_name "USGS-CMG time-series data from the Long-term observations in Massachusetts Bay; Site A-Boston Harbor project, mooring 408 and package 4081-a_d1. Measurements of currents and other oceanographic properties were made to assess the impact of sewage discharge from the proposed outfall site.";
    String nodc_name "FIXED PLATFORM, MOORINGS";
    String short_name "USGS-CMG time-series data: MBAY_LT - 408 - 4081-a_d1";
    String type "fixed";
  }
  time {
    UInt32 _ChunkSizes 1000;
    String _CoordinateAxisType "Time";
    Float64 actual_range 7.19685112e+8, 7.30059412e+8;
    String axis "T";
    String calendar "gregorian";
    String ioos_category "Time";
    String long_name "time of measurement";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  z {
    Float32 actual_range -5.0, -5.0;
    String axis "Z";
    String FillValue "-9999.900390625";
    String grid_mapping "crs";
    String ioos_category "Other";
    String long_name "z of the sensor relative to the water surface";
    String positive "up";
    String standard_name "height";
    String units "m";
    Float32 valid_max -5.0;
    Float32 valid_min -5.0;
  }
  T_20 {
    UInt32 _ChunkSizes 1000;
    Float32 actual_range 1.718079, 11.6322;
    String ancillary_variables "platform";
    String comment "IPTS-1968 Standard";
    String coordinates "time z latitude longitude";
    String coverage_content_type "physicalMeasurement";
    Int32 epic_code 20;
    String FillValue "1.0000000409184788e+35";
    String FORTRAN_format "f10.2";
    String generic_name "temp";
    String grid_mapping "crs";
    String ioos_category "Other";
    String long_name "Water Temperature";
    Float32 missing_value 1.0e+35;
    String platform "platform";
    Float64 sensor_depth 5.0;
    String serial_number "T-   474";
    String standard_name "sea_water_temperature";
    String units "degree_Celsius";
  }
 }
  NC_GLOBAL {
    String cdm_data_type "TimeSeries";
    String cdm_timeseries_variables "station_id";
    Int32 COMPOSITE 0;
    String contributor_name "B. Butman";
    String contributor_role "principalInvestigator";
    String Conventions "COARDS, CF-1.6, ACDD-1.3";
    String COORD_SYSTEM "GEOGRAPHICAL";
    String CREATION_DATE "10-May-2008 11:54:02";
    String creator_email "rsignell@usgs.gov";
    String creator_name "Rich Signell";
    String creator_phone "+1 (508) 548-8700";
    String creator_url "https://www.usgs.gov";
    String DATA_ORIGIN "USGS";
    String DATA_TYPE "TIME";
    String date_created "2017-04-11T22:10:00Z";
    String date_issued "2017-04-11T22:10:00Z";
    String date_metadata_modified "2017-04-11T22:10:00Z";
    String date_modified "2017-04-11T22:10:00Z";
    String DELTA_T "225";
    Int32 DEPTH_CONST 0;
    String DESCRIPT "BOSTON APPROACH SURFACE VMCM. WILD POINTS SCRUBBED.         ";
    Int32 DRIFTER 0;
    Float64 Easternmost_Easting -70.78267;
    String experiment_name "MBAY_LT";
    String featureType "TimeSeries";
    Int32 FILL_FLAG 0;
    String geospatial_bounds "POINT(-70.78266906738281 42.376834869384766)";
    String geospatial_bounds_crs "EPSG:4326";
    Float64 geospatial_lat_max 42.37683;
    Float64 geospatial_lat_min 42.37683;
    Float64 geospatial_lat_resolution 0;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -70.78267;
    Float64 geospatial_lon_min -70.78267;
    Float64 geospatial_lon_resolution 0;
    String geospatial_lon_units "degrees_east";
    String geospatial_vertical_positive "up";
    String geospatial_vertical_resolution "0";
    String geospatial_vertical_units "meters";
    String grid_mapping_epsg_code "EPSG:4326";
    Float64 grid_mapping_inverse_flattening 298.257223563;
    String grid_mapping_long_name "http://www.opengis.net/def/crs/EPSG/0/4326";
    String grid_mapping_name "latitude_longitude";
    Float64 grid_mapping_semi_major_axis 6378137.0;
    String history 
"Fri Nov  1 20:18:20 2019: ncatted -a project,global,a,c,, CMG_Portal MBAY_LT/4081-a_d1.nc
Attributes and variable names adjusted to EPIC standard using fix_buoy_ts.m :BUOY file converted to netCDF using Signell's buoy2epic.exe :Original BUOY creation date was 10:28 MAR 29,'93
2017-04-11T22:10:00Z - pyaxiom - File created using pyaxiom
2024-12-12T10:21:05Z (local files)
2024-12-12T10:21:05Z https://cmgds.marine.usgs.gov/erddap/tabledap/MBAY_LT_4081_a_d1_nc.html";
    String id "4081-a_d1";
    String infoUrl "https://cmgds.marine.usgs.gov/ocean-time-series/";
    String INST_TYPE "T-   474";
    String institution "Coastal and Marine Hazards and Resources Program, U.S. Geological Survey";
    String keywords "Earth Science > Oceans > Ocean Pressure > Water Pressure, Earth Science > Oceans > Ocean Temperature > Water Temperature, Earth Science > Oceans > Salinity/Density > Conductivity, Earth Science > Oceans > Salinity/Density > Salinity";
    String keywords_vocabulary "GCMD Science Keywords";
    Float32 latitude 42.376835;
    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.";
    Float32 longitude -70.78267;
    Float32 magnetic_variation -16.0;
    Float64 MOORING 408;
    String naming_authority "gov.usgs.cmgp";
    String ncei_template_version "NCEI_NetCDF_TimeSeries_Orthogonal_Template_v2.0";
    String NCO "netCDF Operators version 4.8.1 (Homepage = http://nco.sf.net, Code = https://github.com/nco/nco)";
    String NCProperties "version=1|netcdflibversion=4.4.1.1|hdf5libversion=1.8.17";
    Float64 Northernmost_Northing 42.37683;
    String original_filename "4081-a_d1.nc";
    String original_folder "MBAY_LT";
    Int32 POS_CONST 0;
    String project "U.S. Geological Survey Oceanographic Time-Series Data, CMG_Portal";
    String project_summary "Measurements of currents and other oceanographic properties were made to assess the impact of sewage discharge from the proposed outfall site.";
    String project_title "Long-term observations in Massachusetts Bay; Site A-Boston Harbor";
    String publisher_email "emontgomery@usgs.gov";
    String publisher_name "Ellyn Montgomery";
    String publisher_phone "+1 (508) 548-8700";
    String publisher_url "https://www.usgs.gov";
    Int32 sampling_interval 225;
    String source "USGS";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 42.37683;
    String standard_name_vocabulary "CF-1.6";
    String start_time "92-  X -21  16.31.52";
    String stop_time "93- II -18  18.16.52";
    String subsetVariables "station_id";
    String summary "MBAY_LT - 4081-a_d1";
    String time_coverage_duration "PT10374300S";
    String time_coverage_end "1993-02-18T18:16:52Z";
    String time_coverage_start "1992-10-21T16:31:52Z";
    String title "MBAY_LT - 4081-a_d1";
    String VAR_DESC "T";
    Int32 WATER_DEPTH 28;
    Float32 water_depth 28.0;
    String WATER_MASS "?";
    Float64 Westernmost_Easting -70.78267;
  }
}

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.