Make A Graph

Dataset Title:	BW2011 - 9071ysi-a
Institution:	Coastal and Marine Hazards and Resources Program, U.S. Geological Survey (Dataset ID: BW2011_9071ysi_a_nc)
Range:	longitude = -76.0015 to -76.0015°E, latitude = 38.3842 to 38.3842°N, time = 2011-03-22T20:00:22Z to 2011-05-12T12:30:23Z
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 
"BW2011_9071ysi_a_nc
BW2011_9071ysi_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 38.3842, 38.3842;
    String axis "Y";
    String ioos_category "Location";
    String long_name "sensor latitude";
    String standard_name "latitude";
    String units "degrees_north";
    Float32 valid_max 38.3842;
    Float32 valid_min 38.3842;
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float32 actual_range -76.0015, -76.0015;
    String axis "X";
    String ioos_category "Location";
    String long_name "sensor longitude";
    String standard_name "longitude";
    String units "degrees_east";
    Float32 valid_max -76.0015;
    Float32 valid_min -76.0015;
  }
  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 "9071ysi-a";
    String long_name "USGS-CMG time-series data from the Blackwater 2011 project, mooring 907 and package 9071ysi-a. Oceanographic and Water-Quality Measurements made at several sites in 2 watersheds in Blackwater National Wildlife Refuge.";
    String nodc_name "FIXED PLATFORM, MOORINGS";
    String short_name "USGS-CMG time-series data: BW2011 - 907 - 9071ysi-a";
    String type "pole mount";
  }
  time {
    UInt32 _ChunkSizes 1000;
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.300824022e+9, 1.305203423e+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 {
    Float32 actual_range -0.5, -0.5;
    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 -0.5;
    Float32 valid_min -0.5;
  }
  BAT_106 {
    UInt32 _ChunkSizes 1000;
    Float32 actual_range 10.5, 12.6;
    String ancillary_variables "platform";
    String coordinates "time z latitude longitude";
    String coverage_content_type "physicalMeasurement";
    String FillValue "1.0000000409184788e+35";
    String generic_name "BAT_106";
    String grid_mapping "crs";
    String height_depth_units "m";
    Float64 initial_sensor_height 0.35;
    String ioos_category "Other";
    String long_name "battery voltage  ";
    Float32 missing_value 1.0e+35;
    String platform "platform";
    Float64 sensor_depth 0.5;
    String serial_number "145830";
    String units "V";
  }
  C_51 {
    UInt32 _ChunkSizes 1000;
    Float32 actual_range 0.8004, 1.488;
    String ancillary_variables "platform";
    String coordinates "time z latitude longitude";
    String coverage_content_type "physicalMeasurement";
    Int32 epic_code 51;
    String FillValue "1.0000000409184788e+35";
    String FORTRAN_format "f10.3";
    String generic_name "con";
    String grid_mapping "crs";
    String height_depth_units "m";
    Float64 initial_sensor_height 0.35;
    String ioos_category "Other";
    String long_name "Conductivity";
    Float32 missing_value 1.0e+35;
    String platform "platform";
    Float64 sensor_depth 0.5;
    String serial_number "145830";
    String standard_name "sea_water_electrical_conductivity";
    String units "S/m";
  }
  S_40 {
    UInt32 _ChunkSizes 1000;
    Float32 actual_range 4.46, 8.67;
    String ancillary_variables "platform";
    String coordinates "time z latitude longitude";
    String coverage_content_type "physicalMeasurement";
    Int32 epic_code 40;
    String FillValue "1.0000000409184788e+35";
    String FORTRAN_format "f10.2";
    String generic_name "sal";
    String grid_mapping "crs";
    String height_depth_units "m";
    Float64 initial_sensor_height 0.35;
    String ioos_category "Other";
    String long_name "Salinity";
    Float32 missing_value 1.0e+35;
    String platform "platform";
    Float64 sensor_depth 0.5;
    String serial_number "145830";
    String standard_name "sea_water_practical_salinity";
    String units "1e-3";
  }
  SpC_48 {
    UInt32 _ChunkSizes 1000;
    Float32 actual_range 0.8004, 1.488;
    String ancillary_variables "platform";
    String comment "temperature compensated to 25C";
    String coordinates "time z latitude longitude";
    String coverage_content_type "physicalMeasurement";
    Int32 epic_code 48;
    String FillValue "1.0000000409184788e+35";
    String FORTRAN_format "f10.3";
    String generic_name "con";
    String grid_mapping "crs";
    String height_depth_units "m";
    Float64 initial_sensor_height 0.35;
    String ioos_category "Other";
    String long_name "Specific Conductance (conductivity with temperature compensated to 25°C)";
    Float32 missing_value 1.0e+35;
    String platform "platform";
    Float64 sensor_depth 0.5;
    String serial_number "145830";
    String standard_name "sea_water_electrical_conductivity";
    String units "S/m";
  }
  T_28 {
    UInt32 _ChunkSizes 1000;
    Float32 actual_range 4.410004, 28.79999;
    String ancillary_variables "platform";
    String comment "ITS-1990 Standard";
    String coordinates "time z latitude longitude";
    String coverage_content_type "physicalMeasurement";
    Int32 epic_code 28;
    String FillValue "1.0000000409184788e+35";
    String FORTRAN_format "f10.2";
    String generic_name "temp";
    String grid_mapping "crs";
    String height_depth_units "m";
    Float64 initial_sensor_height 0.35;
    String ioos_category "Other";
    String long_name "Water Temperature";
    Float32 missing_value 1.0e+35;
    String platform "platform";
    Float64 sensor_depth 0.5;
    String serial_number "145830";
    String standard_name "sea_water_temperature";
    String units "degree_Celsius";
  }
  pH_159 {
    UInt32 _ChunkSizes 1000;
    Float32 actual_range 6.68, 7.64;
    String ancillary_variables "platform";
    String coordinates "time z latitude longitude";
    String coverage_content_type "physicalMeasurement";
    Int32 epic_code 159;
    String FillValue "1.0000000409184788e+35";
    String FORTRAN_format "f10.4";
    String generic_name "pH";
    String grid_mapping "crs";
    String height_depth_units "m";
    Float64 initial_sensor_height 0.35;
    String ioos_category "Other";
    String long_name "pH";
    Float32 missing_value 1.0e+35;
    String platform "platform";
    Float64 sensor_depth 0.5;
    String serial_number "145830";
    String standard_name "sea_water_ph_reported_on_total_scale";
    String units "1";
  }
  turbidity {
    UInt32 _ChunkSizes 1000;
    Float32 actual_range 4.5, 115.6;
    String ancillary_variables "platform";
    String coordinates "time z latitude longitude";
    String coverage_content_type "physicalMeasurement";
    Int32 epic_code 980;
    String FillValue "1.0000000409184788e+35";
    String generic_name "turbidity";
    String grid_mapping "crs";
    String height_depth_units "m";
    Float64 initial_sensor_height 0.35;
    String ioos_category "Other";
    String long_name "Turbidity";
    Float32 missing_value 1.0e+35;
    String platform "platform";
    Float64 sensor_depth 0.5;
    String serial_number "145830";
    String standard_name "sea_water_turbidity";
    String units "NTU";
  }
 }
  NC_GLOBAL {
    String cdm_data_type "TimeSeries";
    String cdm_timeseries_variables "station_id";
    Int16 COMPOSITE 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 "15-Feb-2012 11:28:14";
    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_SUBTYPE "MOORED";
    String date_created "2017-04-11T21:26:00Z";
    String date_issued "2017-04-11T21:26:00Z";
    String date_metadata_modified "2017-04-11T21:26:00Z";
    String date_modified "2017-04-11T21:26:00Z";
    String DELTA_T "600";
    String deployment_date "22-Mar-2011";
    Int32 DEPTH_CONST 0;
    String DESCRIPTION "Continuous measurement of water temperature salt and turbidity fluxes in tidal creek near Transquaking River.";
    Int32 DRIFTER 0;
    Float64 Easternmost_Easting -76.0015;
    String EXPERIMENT "Blackwater Sediment Fluxes 2011";
    String experiment_name "BW2011";
    String featureType "TimeSeries";
    Int32 FILL_FLAG 0;
    String geospatial_bounds "POINT(-76.00150299072266 38.38420104980469)";
    String geospatial_bounds_crs "EPSG:4326";
    Float64 geospatial_lat_max 38.3842;
    Float64 geospatial_lat_min 38.3842;
    Float64 geospatial_lat_resolution 0;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -76.0015;
    Float64 geospatial_lon_min -76.0015;
    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 20:16:46 2019: ncatted -a project,global,a,c,, CMG_Portal BW2011/9071ysi-a.nc
Trimmed using trunc_cdf,  SVN $Revision: 2554 $ to select records in the range 61 to 7360.  :Converted from ascii to EPIC by ysibw2epic: data where sensors dry at low tide were removed
2017-04-11T21:26:00Z - pyaxiom - File created using pyaxiom
2024-12-12T06:44:31Z (local files)
2024-12-12T06:44:31Z https://cmgds.marine.usgs.gov/tabledap/BW2011_9071ysi_a_nc.das";
    String id "9071ysi-a";
    String infoUrl "https://cmgds.marine.usgs.gov/ocean-time-series/";
    Float32 initial_instrument_height 0.35;
    String INST_TYPE "YSI model 6920";
    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";
    Float32 latitude 38.3842;
    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 -76.0015;
    Float32 magnetic_variation -11.2;
    Float64 MOORING 907;
    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 38.3842;
    String note "YSI sensors intercalibrated regularly, so should be interchangable";
    String original_filename "9071ysi-a.nc";
    String original_folder "BW2011";
    String platform_type "pole mount";
    Int32 POS_CONST 0;
    String project "U.S. Geological Survey Oceanographic Time-Series Data, CMG_Portal";
    String project_summary " Oceanographic and Water-Quality Measurements made at several sites in 2 watersheds in Blackwater National Wildlife Refuge.";
    String project_title " Blackwater 2011";
    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-May-2011";
    String SciPi "N.K.Ganju";
    Float64 serial_number 145830.0;
    String source "USGS";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 38.3842;
    String standard_name_vocabulary "CF-1.6";
    String start_time "22-Mar-2011 20:00:22";
    String stop_time "12-May-2011 12:30:23";
    String subsetVariables "station_id";
    String summary "BW2011 - 9071ysi-a";
    String time_coverage_duration "PT4379401S";
    String time_coverage_end "2011-05-12T12:30:23Z";
    String time_coverage_resolution "PT600S";
    String time_coverage_start "2011-03-22T20:00:22Z";
    String title "BW2011 - 9071ysi-a";
    Float32 VAR_FILL 1.0e+35;
    Float32 WATER_DEPTH 0.85;
    String WATER_DEPTH_datum "none";
    String WATER_DEPTH_note "since the instrument is mounted in a tidal marsh, the water_depth and sensor_depths change with the tides. Attribute values reflect deployment conditions.";
    String WATER_DEPTH_source "estimate";
    Float64 Westernmost_Easting -76.0015;
  }
}

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.