Make A Graph

Dataset Title:	USGS Water Quality Sensor (on Pier 17)
Institution:	USGS (Dataset ID: exploreusgsdata)
Range:	longitude = -122.3967 to -122.3967°E, latitude = 37.8025 to 37.8025°N, time = 2013-12-12T20:00:00Z to (now?)
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Data Access Form

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Graph Type:

X Axis:

Y Axis:

Color:

Constraints	Optional Constraint #1		Optional Constraint #2

Server-side Functions

distinct()

Hover here to see a list of options. Click on an option to select it.

Graph Settings

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N Sections:

Draw land mask:

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(Please be patient. It may take a while to get the data.)

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Then set the File Type: (File Type information)
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or view the URL:
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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 {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.3868784e+9, NaN;
    String axis "T";
    String ioos_category "Time";
    String long_name "Time";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  temperature {
    Float32 actual_range 4.6, 21.2;
    String ioos_category "Temperature";
    String long_name "Water Temperature";
    String units "Celsius";
  }
  temperature_flag {
    String ioos_category "Temperature";
    String long_name "Water Temperature Flag";
  }
  specific_conductance {
    Float32 actual_range 1.0, 51200.0;
    String ioos_category "Other";
    String long_name "Specific Conductance";
    String units "microsiemens";
  }
  specific_conductance_flag {
    String ioos_category "Other";
    String long_name "Specific Conductance Flag";
    String units "percent";
  }
  salinity {
    Float32 actual_range 0.0, 34.0;
    String ioos_category "Salinity";
    String long_name "Salinity";
    String units "PSU";
  }
  salinity_flag {
    String ioos_category "Salinity";
    String long_name "Salinity Flag";
  }
  depth_in_feet {
    Float32 actual_range -0.47, 61.46;
    String ioos_category "Pressure";
    String long_name "Water Depth";
    String units "feet";
  }
  depth_flag {
    String ioos_category "Pressure";
    String long_name "Water Depth Flag";
  }
  turbidity {
    Float32 actual_range -9.9, 991.0;
    String ioos_category "Other";
    String long_name "Turbidity";
    String units "FNU";
  }
  turbidity_flag {
    String ioos_category "Other";
    String long_name "Turbidity Flag";
  }
  dissolved_o2 {
    Float32 actual_range 0.0, 119.0;
    String ioos_category "Other";
    String long_name "Dissolved O2";
    String units "%";
  }
  dissolved_o2_flag {
    String ioos_category "Other";
    String long_name "Dissolved O2 Flag";
  }
  station_id {
    String cf_role "timeseries_id";
    String ioos_category "Other";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float32 actual_range 37.8025, 37.8025;
    String axis "Y";
    String ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float32 actual_range -122.3967, -122.3967;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
 }
  NC_GLOBAL {
    String cdm_data_type "TimeSeries";
    String cdm_timeseries_variables "latitude,longitude,station_id";
    String Conventions "COARDS, CF-1.4, Unidata Dataset Discovery v1.0";
    String creator_email "stung@exploratorium.edu";
    Float64 Easternmost_Easting -122.3967;
    String featureType "TimeSeries";
    Float64 geospatial_lat_max 37.8025;
    Float64 geospatial_lat_min 37.8025;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -122.3967;
    Float64 geospatial_lon_min -122.3967;
    String geospatial_lon_units "degrees_east";
    String history 
"2024-04-27T14:30:36Z (local files)
2024-04-27T14:30:36Z http://erddap.exploratorium.edu:8080/tabledap/exploreusgsdata.das";
    String infoUrl "http://waterdata.usgs.gov/nwis/uv/?site_no=374811122235001&agency_cd=USGS";
    String institution "USGS";
    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.";
    String Metadata_Conventions "COARDS, CF-1.4, Unidata Dataset Discovery v1.0";
    Float64 Northernmost_Northing 37.8025;
    String recursive "true";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 37.8025;
    String standard_name_vocabulary "CF-12";
    String summary "USGS sensor measuring water quality";
    String time_coverage_start "2013-12-12T20:00:00Z";
    String title "USGS Water Quality Sensor (on Pier 17)";
    Float64 Westernmost_Easting -122.3967;
  }
}

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.

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