Make A Graph

Dataset Title:	BARNEGAT - 9771ecp-a
Institution:	Coastal and Marine Hazards and Resources Program, U.S. Geological Survey (Dataset ID: BARNEGAT_9771ecp_a_nc)
Range:	longitude = -74.09451 to -74.09451°E, latitude = 39.95982 to 39.95982°N, time = 2013-08-14T13:45:06Z to 2013-09-06T05:45:09Z
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Subset \| Data Access Form \| Files

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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:

Web page authors can embed a graph of the latest data in a web page using HTML <img> tags.
Anyone can use ERDDAPs Slide Sorter to build a personal web page that displays graphs with the latest data (or other images or HTML content), each in its own, draggable slide.

The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  station_id {
    String actual_range 
"BARNEGAT_9771ecp_a_nc
BARNEGAT_9771ecp_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";
    Float64 actual_range 39.95982, 39.95982;
    String axis "Y";
    String ioos_category "Location";
    String long_name "sensor latitude";
    String standard_name "latitude";
    String units "degrees_north";
    Float64 valid_max 39.95982;
    Float64 valid_min 39.95982;
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float64 actual_range -74.09451, -74.09451;
    String axis "X";
    String ioos_category "Location";
    String long_name "sensor longitude";
    String standard_name "longitude";
    String units "degrees_east";
    Float64 valid_max -74.09451;
    Float64 valid_min -74.09451;
  }
  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 "9771ecp-a";
    String long_name "USGS-CMG time-series data from the Light attenuation and sediment resuspension in Barnegat Bay New Jersey project, mooring 977 and package 9771ecp-a. Light attenuation is a critical parameter governing the ecological function of shallow estuaries.  Near-bottom and mid-water observations of currents, pressure, chlorophyll, and fDOM were collected at three pairs of sites sequentially at different locations in the estuary to characterize the conditions.";
    String nodc_name "FIXED PLATFORM, MOORINGS";
    String short_name "USGS-CMG time-series data: BARNEGAT - 977 - 9771ecp-a";
    String type "fixed";
  }
  time {
    UInt32 _ChunkSizes 1000;
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.376487906e+9, 1.378446309e+9;
    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 {
    Float64 actual_range -0.56, -0.56;
    String axis "Z";
    String FillValue "-9999.9";
    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";
    Float64 valid_max -0.56;
    Float64 valid_min -0.56;
  }
  PAR_905 {
    UInt32 _ChunkSizes 1000;
    Float64 actual_range 0.04054086150580183, 2458.9347134471736;
    String ancillary_variables "platform";
    Float64 cal_a0 4456.0;
    Float64 cal_a1 2886.0;
    String cal_date "3/18/2013";
    Float64 cal_Im 1.3589;
    String coordinates "time z latitude longitude";
    String coverage_content_type "physicalMeasurement";
    String DATA_CMNT "Values are average of 16 samples. Values less than 0.040509 replaced with fill value";
    Int32 epic_code 905;
    String FillValue "1e+35";
    String grid_mapping "crs";
    String height_depth_units "m";
    Float64 initial_sensor_height 0.44;
    String ioos_category "Other";
    String long_name "Photosynthetic Active Radiation (PAR)";
    Float64 missing_value 1.0e+35;
    String platform "platform";
    String serial_number "274";
    String standard_name "downwelling_photosynthetic_radiative_flux_in_sea_water";
    String units "mol m-2 s-1";
  }
 }
  NC_GLOBAL {
    String cdm_data_type "TimeSeries";
    String cdm_timeseries_variables "station_id";
    Float64 COMPOSITE 0.0;
    String contributor_name "N. Ganju";
    String contributor_role "principalInvestigator";
    String Conventions "COARDS, CF-1.6, ACDD-1.3";
    String COORD_SYSTEM "GEOGRAPHIC";
    String CREATION_DATE "11-Jun-2014 17:15:20";
    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 "Average values for each burst. Short data record because instrument failed and stopped sampling on 9/06/13";
    String DATA_ORIGIN "USGS WHSC Sed Trans Group";
    String DATA_SUBTYPE "MOORED";
    String date_created "2017-04-11T21:11:00Z";
    String date_issued "2017-04-11T21:11:00Z";
    String date_metadata_modified "2017-04-11T21:11:00Z";
    String date_modified "2017-04-11T21:11:00Z";
    Float64 DELTA_T 300.0;
    String Deployment_date "14-Aug-2013";
    Float64 DEPTH_CONST 1.0;
    String DESCRIPTION "Shallow water light attenuation";
    Float64 DRIFTER 0.0;
    Float64 Easternmost_Easting -74.09451;
    String EXPERIMENT "Barnegat Bay, NJ";
    String experiment_name "BARNEGAT";
    String featureType "TimeSeries";
    Float64 FILL_FLAG 1.0;
    String geospatial_bounds "POINT(-74.09451 39.95982)";
    String geospatial_bounds_crs "EPSG:4326";
    Float64 geospatial_lat_max 39.95982;
    Float64 geospatial_lat_min 39.95982;
    Float64 geospatial_lat_resolution 0;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -74.09451;
    Float64 geospatial_lon_min -74.09451;
    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 20:16:45 2019: ncatted -a project,global,a,c,, CMG_Portal BARNEGAT/9771ecp-a.nc
Trimmed using trunc_cdf,  SVN $Revision: 3342 $ to select records in the range 202 to 6730.  :created using PAR2ncNativePJD in Matlab 8.0.0.783 (R2012b).
2017-04-11T21:11:00Z - pyaxiom - File created using pyaxiom
2024-12-12T06:38:56Z (local files)
2024-12-12T06:38:56Z https://cmgds.marine.usgs.gov/tabledap/BARNEGAT_9771ecp_a_nc.das";
    String id "9771ecp-a";
    String infoUrl "https://cmgds.marine.usgs.gov/ocean-time-series/";
    Float64 initial_instrument_height 0.44;
    String INST_TYPE "WETLabs ECO-PARSB";
    String institution "Coastal and Marine Hazards and Resources Program, U.S. Geological Survey";
    String institution_url "https://woodshole.er.usgs.gov";
    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 39.95982;
    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 -74.09451;
    Float64 magnetic_variation -12.76;
    Float64 min_counts 53.0;
    Float64 MOORING 977;
    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 39.95982;
    String original_filename "9771ecp-a.nc";
    String original_folder "BARNEGAT";
    String platform "SWIP";
    Float64 POS_CONST 0.0;
    String PROJECT "USGS Coastal Marine Geology Program";
    String project "U.S. Geological Survey Oceanographic Time-Series Data, CMG_Portal";
    String project_summary " Light attenuation is a critical parameter governing the ecological function of shallow estuaries.  Near-bottom and mid-water observations of currents, pressure, chlorophyll, and fDOM were collected at three pairs of sites sequentially at different locations in the estuary to characterize the conditions.";
    String project_title "Light attenuation and sediment resuspension in Barnegat Bay New Jersey";
    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 Recovery_date "12-Sep-2013";
    String SciPi "N. Ganju";
    String SN "274";
    String source "USGS";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 39.95982;
    String standard_name_vocabulary "CF-1.6";
    String start_time "14-Aug-2013 13:45:05";
    String stop_time "06-Sep-2013 05:45:08";
    String subsetVariables "station_id";
    String summary "BARNEGAT - 9771ecp-a";
    String time_coverage_duration "PT1958403S";
    String time_coverage_end "2013-09-06T05:45:09Z";
    String time_coverage_resolution "PT300S";
    String time_coverage_start "2013-08-14T13:45:06Z";
    String title "BARNEGAT - 9771ecp-a";
    String VAR_DESC "PAR";
    Float64 VAR_FILL 1.0e+35;
    Float64 WATER_DEPTH 1.0;
    String WATER_DEPTH_NOTE "(meters), nominal depth";
    String WATER_MASS "Barnegat Bay";
    Float64 Westernmost_Easting -74.09451;
  }
}

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.