Data Access Form

Dataset Title:	MBAY_LT - 5301Atcp-a
Institution:	Coastal and Marine Hazards and Resources Program, U.S. Geological Survey (Dataset ID: MBAY_LT_5301Atcp_a_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

"5301Atcp-a"

latitude (sensor latitude, degrees_north)

42.377

longitude (sensor longitude, degrees_east)

-70.785

crs

-2147483647

platform

-2147483647

time (time of measurement, UTC)

1998-06-17T15:13:06Z

1998-09-03T01:46:51Z

z (m)

-28.66258

ATTN_55 (Beam Attenuation, 1/m)

0.06797356

10.60511

C_50 (Conductivity, S/m)

3.056428

3.27489

P_4023 (dbar)

36.92322

40.65077

S_40 (Salinity, 1e-3)

30.84791

31.65667

T_20 (degree_Celsius)

5.199585

8.100647

tran_4010 (volts)

0.3111

4.33466

Server-side Functions

distinct()

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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  station_id {
    String actual_range 
"MBAY_LT_5301Atcp_a_nc
MBAY_LT_5301Atcp_a_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 42.377, 42.377;
    String axis "Y";
    String ioos_category "Location";
    String long_name "sensor latitude";
    String standard_name "latitude";
    String units "degrees_north";
    Float32 valid_max 42.377;
    Float32 valid_min 42.377;
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float32 actual_range -70.785, -70.785;
    String axis "X";
    String ioos_category "Location";
    String long_name "sensor longitude";
    String standard_name "longitude";
    String units "degrees_east";
    Float32 valid_max -70.785;
    Float32 valid_min -70.785;
  }
  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 "5301Atcp-a";
    String long_name "USGS-CMG time-series data from the Long-term observations in Massachusetts Bay; Site A-Boston Harbor project, mooring 530 and package 5301Atcp-a. 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 - 530 - 5301Atcp-a";
    String type "fixed";
  }
  time {
    UInt32 _ChunkSizes 1000;
    String _CoordinateAxisType "Time";
    Float64 actual_range 8.98096386e+8, 9.04787211e+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 -28.66258, -28.66258;
    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 -28.662577;
    Float32 valid_min -28.662577;
  }
  ATTN_55 {
    UInt32 _ChunkSizes 1000;
    Float32 actual_range 0.06797356, 10.60511;
    String ancillary_variables "platform";
    String coordinates "time z latitude longitude";
    String coverage_content_type "physicalMeasurement";
    Int32 epic_code 55;
    String FillValue "-9999.900390625";
    Float64 focal_length 0.25;
    String formula "-(1/focal_length) .* log(tran_4010./(.95*Vair))";
    String FORTRAN_format "f7.5";
    String generic_name "attn";
    String grid_mapping "crs";
    String interp_note "163 pad values interpolated.";
    String ioos_category "Other";
    String long_name "Beam Attenuation";
    Float32 missing_value -9999.9;
    String platform "platform";
    Float64 pre_unblocked 4.641;
    Float32 sensor_depth 29.0226;
    Float32 sensor_hab 1.81;
    String sensor_type "Sea Tech       ";
    String serial_number "104";
    String standard_name "volume_beam_attenuation_coefficient_of_radiative_flux_in_sea_water";
    String units "1/m";
    Float64 Vair 4.641;
  }
  C_50 {
    UInt32 _ChunkSizes 1000;
    Float32 actual_range 3.056428, 3.27489;
    String ancillary_variables "platform";
    Float64 cal_A 2.81616942e-8;
    Float64 cal_B 0.477828833;
    Float64 cal_C -4.23754856;
    Float64 cal_D -3.3627828e-5;
    Float64 cal_M 6.6;
    Float64 clock_hertz 2457582.35;
    String coordinates "time z latitude longitude";
    String coverage_content_type "physicalMeasurement";
    Int32 epic_code 50;
    String FillValue "-9999.900390625";
    String generic_name "con";
    String grid_mapping "crs";
    String ioos_category "Other";
    String long_name "Conductivity";
    Float32 missing_value -9999.9;
    Float64 period_count 247.0;
    String platform "platform";
    Float32 sensor_depth 28.8926;
    Float32 sensor_hab 1.94;
    String sensor_type "Sea Bird SBE-3 ";
    String serial_number "371";
    String standard_name "sea_water_electrical_conductivity";
    String units "S/m";
  }
  P_4023 {
    UInt32 _ChunkSizes 1000;
    Float32 actual_range 36.92322, 40.65077;
    String ancillary_variables "platform";
    Float64 cal_C1 589.1866;
    Float64 cal_C2 4.24177e-4;
    Float64 cal_C3 -6.25844e-5;
    Float64 cal_D1 0.026538;
    Float64 cal_D2 0.0;
    Float64 cal_T1 27.78682;
    Float64 cal_T2 -4.32422e-5;
    Float64 cal_T3 9.63356e-7;
    Float64 cal_T4 1.41121e-9;
    Float64 cal_T5 0.0;
    Float64 clock_hertz 2457582.35;
    String coordinates "time z latitude longitude";
    String coverage_content_type "physicalMeasurement";
    Int32 epic_code 4023;
    String FillValue "-9999.900390625";
    String FORTRAN_format "f10.3";
    String generic_name "pres";
    String grid_mapping "crs";
    String ioos_category "Other";
    String long_name "Sea Water Pressure (average over burst)";
    Float32 missing_value -9999.9;
    Float64 period_count 6208.0;
    String platform "platform";
    Float32 sensor_depth 28.6626;
    Float32 sensor_hab 2.17;
    String sensor_type "Paroscientific ";
    String serial_number "62495  ";
    String standard_name "sea_water_pressure";
    String units "dbar";
  }
  S_40 {
    UInt32 _ChunkSizes 1000;
    Float32 actual_range 30.84791, 31.65667;
    String ancillary_variables "platform";
    String coordinates "time z latitude longitude";
    String coverage_content_type "physicalMeasurement";
    Int32 epic_code 40;
    String FillValue "-9999.900390625";
    String FORTRAN_format "f10.2";
    String generic_name "sal";
    String grid_mapping "crs";
    String ioos_category "Other";
    String long_name "Salinity";
    Float32 missing_value -9999.9;
    String platform "platform";
    Float32 sensor_depth 28.8926;
    Float32 sensor_hab 1.94;
    String sensor_type "Sea Bird SBE-3 ";
    String serial_number "371";
    String standard_name "sea_water_practical_salinity";
    String units "1e-3";
  }
  T_20 {
    UInt32 _ChunkSizes 1000;
    Float32 actual_range 5.199585, 8.100647;
    String ancillary_variables "platform";
    Float64 cal_A 0.00368168442;
    Float64 cal_B 6.00180571e-4;
    Float64 cal_C 1.46349713e-5;
    Float64 cal_D 1.97685949e-6;
    Float64 cal_Fo 6570.34;
    Float64 clock_hertz 2457582.35;
    String coordinates "time z latitude longitude";
    String coverage_content_type "physicalMeasurement";
    Int32 epic_code 20;
    String FillValue "-9999.900390625";
    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 -9999.9;
    Float64 period_count 247.0;
    String platform "platform";
    Float32 sensor_depth 29.0226;
    Float32 sensor_hab 1.81;
    String sensor_type "Sea Bird SBE-4 ";
    String serial_number "1115";
    String standard_name "sea_water_temperature";
    String units "degree_Celsius";
  }
  tran_4010 {
    UInt32 _ChunkSizes 1000;
    Float32 actual_range 0.3111, 4.33466;
    String ancillary_variables "platform";
    Float64 AtoD_factor 0.00122;
    String coordinates "time z latitude longitude";
    String coverage_content_type "physicalMeasurement";
    Int32 epic_code 4010;
    String FillValue "-9999.900390625";
    Float64 focal_length 0.25;
    String FORTRAN_format "f10.3";
    String generic_name "trans";
    String grid_mapping "crs";
    String interp_note "163 pad values interpolated.";
    String ioos_category "Other";
    String long_name "TRANSMISSION (VOLTS)     ";
    Float32 missing_value -9999.9;
    String platform "platform";
    Float32 sensor_depth 29.0226;
    Float32 sensor_hab 1.81;
    String sensor_type "Sea Tech       ";
    String serial_number "104";
    String units "volts";
    Float64 Vair 4.641;
  }
 }
  NC_GLOBAL {
    String cdm_data_type "TimeSeries";
    String cdm_timeseries_variables "station_id";
    Float64 COMPOSITE 1.0;
    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 "12-Jan-2009 13:30:40";
    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_CMNT "Boston Approach BASS MIDAS";
    String DATA_ORIGIN "USGS WHFC Sed Trans Grp";
    String DATA_TYPE "TIME";
    String date_created "2017-04-11T22:14:00Z";
    String date_issued "2017-04-11T22:14:00Z";
    String date_metadata_modified "2017-04-11T22:14:00Z";
    String date_modified "2017-04-11T22:14:00Z";
    String DELTA_T "225";
    Int32 DEPTH_CONST 0;
    String DESCRIPT "Boston Buoy B BASS MIDAS";
    Int32 DRIFTER 0;
    Float64 Easternmost_Easting -70.785;
    String EXPERIMENT "Mass Bay Longterm";
    String experiment_name "MBAY_LT";
    String featureType "TimeSeries";
    Float64 FILL_FLAG 0.0;
    String geospatial_bounds "POINT(-70.78500366210938 42.37699890136719)";
    String geospatial_bounds_crs "EPSG:4326";
    Float64 geospatial_lat_max 42.377;
    Float64 geospatial_lat_min 42.377;
    Float64 geospatial_lat_resolution 0;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -70.785;
    Float64 geospatial_lon_min -70.785;
    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 20:19:26 2019: ncatted -a project,global,a,c,, CMG_Portal MBAY_LT/5301Atcp-a.nc
WATER_DEPTH related attributes corrected by adj_tripod_depth: 326 pad values replaced by linear interpolations using EPIC_interp.m : Variables ATTN_55 , tran_4010 ,  edited using maskedit.m with mask file 5301tcp-e.msk.  :Variables tran_4010, ATTN_55,  edited using rangedit.m to select ATTN_55 in the range 0 to 11.  :Concatenation of files 5301Atcp-trm.nc through 5301Ctcp-trm.nc :Trimmed using truncate.m to select records in the range 340 to 12000.  :Calibrated using MIDAStcp.m  :Converted to netCDF by MIDAS.EXE v2.10
2017-04-11T22:14:00Z - pyaxiom - File created using pyaxiom
2024-12-12T10:26:34Z (local files)
2024-12-12T10:26:34Z https://cmgds.marine.usgs.gov/erddap/tabledap/MBAY_LT_5301Atcp_a_nc.html";
    String id "5301Atcp-a";
    String infoUrl "https://cmgds.marine.usgs.gov/ocean-time-series/";
    String INST_TYPE "MIDAS";
    String institution "Coastal and Marine Hazards and Resources Program, U.S. Geological Survey";
    String instrument_number "MIDAS1";
    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";
    Float64 latitude 42.37716444439358;
    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 longitude -70.78466638882955;
    Float64 magnetic_variation -16.0;
    Float64 MOORING 530;
    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 42.377;
    String original_filename "5301Atcp-a.nc";
    String original_folder "MBAY_LT";
    Int32 POS_CONST 0;
    String PROJECT "MWRA";
    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";
    String source "USGS";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 42.377;
    String standard_name_vocabulary "CF-1.6";
    String start_time "17-Jun-1998 15:13:06";
    String stop_time "03-Sep-1998 01:46:51";
    String subsetVariables "station_id";
    String summary "MBAY_LT - 5301Atcp-a";
    String time_coverage_duration "PT6690825S";
    String time_coverage_end "1998-09-03T01:46:51Z";
    String time_coverage_start "1998-06-17T15:13:06Z";
    String title "MBAY_LT - 5301Atcp-a";
    String VAR_DESC "C:S:P:T:tran:ATTN";
    String VAR_FILL "NaN";
    Float32 WATER_DEPTH 30.832577;
    String WATER_DEPTH_NOTE "water depth computed using mean pressure from 5301Atcp-a1h.nc - atmosphere (1013.3): (m) ";
    String WATER_MASS "?";
    Float64 Westernmost_Easting -70.785;
  }
}

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.