Data Access Form

Dataset Title:	CCB21 - 11261sigs-a
Institution:	Coastal and Marine Hazards and Resources Program, U.S. Geological Survey (Dataset ID: 10_5066_P19NUBNW_11261sigs_a_nc)
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Files \| Make a graph

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Variable	Minimum	Maximum
station_id	"10_5066_P19NUBNW_1..."	"10_5066_P19NUBNW_1..."
time (time (UTC), UTC)	2021-03-10T16:00:00Z	2021-04-07T13:00:00Z

z (height relative to NAVD88, m)	-6.89	-6.89
depth_m (depth below mean sea level, m)	6.739999999999999	6.739999999999999
latitude (degrees_north)	41.742658	41.742658

longitude (degrees_east)	-70.330452	-70.330452

wp_peak (Dominant (peak) wave period, s)	2.782608695652174	16.0
wh_4061 (Significant wave height, m)	0.023231722617291947	3.1092214326104544
wp_4060 (Average wave period, s)	1.9061811324762536	6.572031321657955
frequency (Hz)	0.015625	2.0
pspec (m^2/Hz)	7.338097488395315E-9	12.10350657527063
water_depth (Total water depth, m)	6.7557313747257774	10.955753993494003
water_level (Water level NAVD88, m)	-2.272221698760986	1.9173778152465824

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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  station_id {
    String actual_range 
"10_5066_P19NUBNW_11261sigs_a_nc
10_5066_P19NUBNW_11261sigs_a_nc";
    String cf_role "timeseries_id";
    String ioos_category "Identifier";
    String long_name "Station ID";
  }
  time {
    UInt32 _ChunkSizes 1024;
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.615392e+9, 1.6178004e+9;
    String axis "T";
    String calendar "proleptic_gregorian";
    String ioos_category "Time";
    String long_name "time (UTC)";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  z {
    Float64 actual_range -6.89, -6.89;
    String axis "Z";
    String geopotential_datum_name "NAVD88";
    String ioos_category "Other";
    String long_name "height relative to NAVD88";
    String positive "up";
    String standard_name "height";
    String units "m";
  }
  depth_m {
    Float64 actual_range 6.739999999999999, 6.739999999999999;
    String ioos_category "Other";
    String long_name "depth below mean sea level";
    String positive "down";
    String standard_name "depth";
    String units "m";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float64 actual_range 41.742658, 41.742658;
    String axis "Y";
    Int32 epic_code 500;
    String ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float64 actual_range -70.330452, -70.330452;
    String axis "X";
    Int32 epic_code 502;
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  wp_peak {
    UInt32 _ChunkSizes 512;
    Float64 actual_range 2.782608695652174, 16.0;
    Int32 epic_code 4063;
    String FillValue "nan";
    String ioos_category "Other";
    String long_name "Dominant (peak) wave period";
    Float64 maximum 16.0;
    Float64 minimum 2.782608695652174;
    String standard_name "sea_surface_wave_period_at_variance_spectral_density_maximum";
    String units "s";
  }
  wh_4061 {
    UInt32 _ChunkSizes 335;
    Float64 actual_range 0.023231722617291947, 3.1092214326104544;
    Int32 epic_code 4061;
    String FillValue "nan";
    String ioos_category "Other";
    String long_name "Significant wave height";
    Float64 maximum 3.1092214326104544;
    Float64 minimum 0.023231722617291947;
    String standard_name "sea_surface_wave_significant_height";
    String units "m";
  }
  wp_4060 {
    UInt32 _ChunkSizes 335;
    Float64 actual_range 1.9061811324762536, 6.572031321657955;
    Int32 epic_code 4060;
    String FillValue "nan";
    String ioos_category "Other";
    String long_name "Average wave period";
    Float64 maximum 6.572031321657955;
    Float64 minimum 1.9061811324762536;
    String standard_name "sea_surface_wave_mean_period_from_variance_spectral_density_second_frequency_moment";
    String units "s";
  }
  frequency {
    Float64 actual_range 0.015625, 2.0;
    String ioos_category "Other";
    String long_name "Frequency";
    String standard_name "sea_surface_wave_frequency";
    String units "Hz";
  }
  pspec {
    UInt32 _ChunkSizes 1, 255;
    Float64 actual_range 7.338097488395315e-9, 12.10350657527063;
    String FillValue "nan";
    String ioos_category "Other";
    String long_name "Pressure-derived non-directional wave energy spectrum";
    Float64 maximum 12.10350657527063;
    Float64 minimum 7.338097488395315e-9;
    String note "Use caution: all spectra are provisional";
    String standard_name "sea_surface_wave_variance_spectral_density";
    String units "m^2/Hz";
  }
  water_depth {
    UInt32 _ChunkSizes 335;
    Float64 actual_range 6.7557313747257774, 10.955753993494003;
    Int32 epic_code 3;
    String FillValue "nan";
    String ioos_category "Other";
    String long_name "Total water depth";
    Float64 maximum 10.955753993494003;
    Float64 minimum 6.7557313747257774;
    String note "Water depth calculated by converting P_1ac to sensor depth using S_41 and T_28 from file 11263mc-a.nc + pressure_sensor_height";
    String standard_name "sea_floor_depth_below_sea_surface";
    String units "m";
  }
  water_level {
    UInt32 _ChunkSizes 335;
    Float64 actual_range -2.272221698760986, 1.9173778152465824;
    String FillValue "nan";
    String geopotential_datum_name "NAVD88";
    String ioos_category "Other";
    String long_name "Water level NAVD88";
    Float64 maximum 1.9173778152465824;
    Float64 minimum -2.272221698760986;
    String note "Water level calculated as brangeAST + zsen";
    String standard_name "sea_surface_height_above_geopotential_datum";
    String units "m";
  }
 }
  NC_GLOBAL {
    Float64 ast_qual_min 108.0;
    Float64 ast_qual_sf 0.93;
    String atmospheric_pressure_correction_file "11261sig-atmpres.cdf";
    Float32 atmospheric_pressure_correction_offset_applied -9.483928;
    Int32 average_duration 240;
    Int32 average_interval 360;
    String basefile "mat/S102410A006_11261sig";
    Int32 beam_angle 25;
    Float64 bin_size 1.0;
    String cdm_data_type "TimeSeries";
    String cdm_timeseries_variables "station_id";
    String clip_f "true";
    Int32 ClockError 0;
    String Conventions "COARDS, CF-1.6, ACDD-1.3";
    String COORD_SYSTEM "GEOGRAPHIC";
    String creator_url "https://www.usgs.gov";
    Int32 cutoff_ampl 0;
    String DATA_CMNT "No magnetic variation recorded, used data from IGRF model via ngdc.noaa.gov.";
    String DATA_ORIGIN "USGS WHCMSC Coastal and Estuarine Dynamics Group";
    String DATA_SUBTYPE "MOORED";
    String data_type "Burst";
    Int32 DELTA_T 3600;
    String Deployment_date "10-Mar-2021 16:00";
    Float64 DEPTH_CONST 0.0;
    String DESCRIPTION "Cape Cod Bay, Sandy Neck Beach, Barnstable, MA";
    String diwasp "optimized";
    Int32 diwasp_ibin 3;
    Int32 diwasp_iter 100;
    String diwasp_method "IMLM";
    String diwasp_names "diwasp";
    String diwasp_pow2 "true";
    String diwasp_smooth "ON";
    Float64 DRIFTER 0.0;
    Float64 Easternmost_Easting -70.330452;
    String EXPERIMENT "CCB21";
    String experiment_name "10.5066-P19NUBNW";
    String featureType "TimeSeries";
    String Field_Activity_Number "2021-018-FA, 2021-020-FA";
    String filename "11261sig";
    Float64 frequency 1000.0;
    String geopotential_datum_name "NAVD88";
    String geopotential_datum_note "Elevation at seabed using VDatum with LMSL and GEOID18";
    Float64 geospatial_lat_max 41.742658;
    Float64 geospatial_lat_min 41.742658;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -70.330452;
    Float64 geospatial_lon_min -70.330452;
    String geospatial_lon_units "degrees_east";
    String head_rotation "horizontal";
    Float64 height_above_geopotential_datum -9.01;
    String history 
"2025-09-17T16:21:14.706172+00:00: Processed using mat2cdf.py with stglib 1.6.1+51.gd44a195.dirty, xarray 2024.2.0, NumPy 1.26.4, netCDF4 1.6.5, Python 3.11.8.
2025-09-17T16:22:16.155998+00:00: Atmospherically corrected using time-series from 11261sig-atmpres.cdf and offset of -9.483927726745605
2025-09-17T16:22:16.257850+00:00: Data clipped using Deployment_date of 10-Mar-2021 16:00 and Recovery_date of 07-Apr-2021 14:07.
2025-09-17T16:22:16.298974+00:00: Rotating heading and horizontal velocities by -14.47 degrees.
2025-09-17T16:22:16.431554+00:00: Trimmed velocity data using atmospherically corrected pressure (water level) and sidelobes.
2025-09-17T16:22:19.340344+00:00: brangeAST trimmed where ast_quality < 108.0
2025-09-17T16:22:19.343335+00:00: Create water_level variable relative to NAVD88 as brangeAST + zsen
2025-09-17T16:22:19.344337+00:00: Processed to CF-1.10 using runots.py.
2025-09-17T16:22:19.362339+00:00: make time encoding to dtype double because tstep <xarray.DataArray 'time' ()> Size: 8B
array(249998000, dtype='timedelta64[ns]') seconds is < 1 minute
2025-09-17T16:23:49.787726+00:00: Wave statistics computed using scipy.signal.welch(), assigning cutoff following Jones & Monismith (2007), and applying f^-4 tail past cutoff.
2025-09-17T16:23:49.875748+00:00: Create water_depth variable by converting P_1ac to sensor depth using S_41 and T_28 from file 11263mc-a.nc + pressure_sensor_height
2025-09-17T16:23:49.878766+00:00: Create water_level variable relative to NAVD88 as brangeAST + zsen

2025-12-05T08:40:16Z (local files)
2025-12-05T08:40:16Z https://cmgds.marine.usgs.gov/erddap/tabledap/10_5066_P19NUBNW_11261sigs_a_nc.html";
    String horizontal_datum_name "NAD83(2011)";
    String infoUrl "https://cmgds.marine.usgs.gov/ocean-time-series/";
    Float64 initial_instrument_height 2.12;
    String initial_instrument_height_note "From seabed";
    String institution "Coastal and Marine Hazards and Resources Program, U.S. Geological Survey";
    String institution_url "https://woodshole.er.usgs.gov";
    String instrument_type "Signature1000";
    Float64 latitude 41.742658;
    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 -70.330452;
    Float64 magnetic_variation -14.47;
    String MOORING "1126";
    String NCProperties "version=2,netcdf=4.9.2,hdf5=1.14.3";
    Float64 nominal_sensor_depth 6.739999999999999;
    String nominal_sensor_depth_note "WATER_DEPTH - initial_instrument_height";
    Float64 Northernmost_Northing 41.742658;
    String orientation "UP";
    String P_1ac_note "Corrected for variations in atmospheric pressure using MesoWest Station FW7612 Dennis.";
    String platform_type "Quadpod";
    Float64 POS_CONST 0.0;
    Float64 pressure_sensor_height 2.12;
    String PROJECT "USGS Coastal and Marine Hazards and Resources Program";
    String publisher_url "https://www.usgs.gov";
    String puv "false";
    String Recovery_date "07-Apr-2021 14:07";
    Float64 sample_interval 0.25;
    String sample_mode "CONTINUOUS";
    Int32 sample_rate 4;
    String SciPi "John Warner";
    Float64 sea_floor_depth_below_mean_sea_level 8.86;
    Int32 serial_number 102410;
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 41.742658;
    String start_time "2021-03-10T16:00:00.125997000";
    String stop_time "2021-04-07T14:07:59.875996000";
    String summary "Unspecified";
    String time_coverage_end "2021-04-07T13:00:00Z";
    String time_coverage_start "2021-03-10T16:00:00Z";
    String title "CCB21 - 11261sigs-a";
    Float64 transducer_offset_from_bottom 2.12;
    String trim_ast "true";
    Int32 trim_avg_vel_bins 1;
    String trim_method "water level sl";
    Float64 VAR_FILL NaN;
    String vel_b5_bad_ens 
"2021-03-10 15:39
2021-03-10 18:12";
    Float64 WATER_DEPTH 8.86;
    String WATER_DEPTH_NOTE "(meters), Mean water level from Signature pressure data, converted to depth using density and gravity";
    String water_level_var "brangeAST";
    String WATER_MASS "Cape Cod Bay";
    Int32 wave_duration 2048;
    Int32 wave_interval 3600;
    Int32 wave_samples_per_burst 8192;
    String wave_start_time "2021-03-10 16:00:00";
    String wavedat_tolerance "2 s";
    Float64 Westernmost_Easting -70.330452;
    String zeroed_pressure "No";
  }
}

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.