Make A Graph

Dataset Title:	CeNCOOS in situ water quality monitoring at the Cal Poly Pier San Luis Obispo
Institution:	California Polytechnic State Univeristy, San Luis Obispo (Dataset ID: edu_calpoly_marine_sanluis_sh)
Range:	longitude = -120.74061 to -120.74061°E, latitude = 35.17013 to 35.17013°N, time = 2017-09-01T00:03:00Z to 2023-07-04T23:42:00Z
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| 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 {
  time {
    UInt32 _ChunkSizes 512;
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.50422418e+9, 1.68851412e+9;
    String axis "T";
    String calendar "gregorian";
    String cf_role "profile_id";
    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";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float64 _FillValue NaN;
    Float64 actual_range 35.17013, 35.17013;
    String axis "Y";
    String ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float64 _FillValue NaN;
    Float64 actual_range -120.74061, -120.74061;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  z {
    UInt32 _ChunkSizes 511;
    String _CoordinateAxisType "Height";
    String _CoordinateZisPositive "up";
    Float64 _FillValue NaN;
    Float64 actual_range -13.0, 0.0;
    String axis "Z";
    String ioos_category "Location";
    String long_name "Altitude";
    String positive "up";
    String standard_name "altitude";
    String units "m";
  }
  mass_concentration_of_chlorophyll_in_sea_water {
    UInt32 _ChunkSizes 512;
    Float64 _FillValue -9999.0;
    Float64 actual_range -0.938, 420.038;
    String gts_ingest "true";
    String id "1001989";
    String ioos_category "Other";
    String long_name "Chlorophyll";
    Float64 missing_value -9999.0;
    String platform "station";
    String short_name "mass_concentration_of_chlorophyll_in_sea_water";
    String standard_name "mass_concentration_of_chlorophyll_in_sea_water";
    String standard_name_url "http://mmisw.org/ont/cf/parameter/mass_concentration_of_chlorophyll_in_sea_water";
    String units "microg.L-1";
  }
  sea_water_electrical_conductivity {
    UInt32 _ChunkSizes 512;
    Float64 _FillValue -9999.0;
    Float64 actual_range 0.0, 127.05;
    String id "1001986";
    String ioos_category "Other";
    String long_name "Conductivity";
    Float64 missing_value -9999.0;
    String platform "station";
    String short_name "sea_water_electrical_conductivity";
    String standard_name "sea_water_electrical_conductivity";
    String standard_name_url "http://mmisw.org/ont/cf/parameter/sea_water_electrical_conductivity";
    String units "mS.cm-1";
  }
  sea_water_practical_salinity {
    UInt32 _ChunkSizes 512;
    Float64 _FillValue -9999.0;
    Float64 actual_range 0.0, 34.473;
    String gts_ingest "true";
    String id "1001990";
    String ioos_category "Other";
    String long_name "Salinity";
    Float64 missing_value -9999.0;
    String platform "station";
    String short_name "sea_water_practical_salinity";
    String standard_name "sea_water_practical_salinity";
    String standard_name_url "http://mmisw.org/ont/cf/parameter/sea_water_practical_salinity";
    String units "1e-3";
  }
  sea_water_density {
    UInt32 _ChunkSizes 512;
    Float64 _FillValue -9999.0;
    Float64 actual_range 0.0, 0.0;
    String id "1001992";
    String ioos_category "Other";
    String long_name "Sea Water Density";
    Float64 missing_value -9999.0;
    String platform "station";
    String short_name "sea_water_density";
    String standard_name "sea_water_density";
    String standard_name_url "http://mmisw.org/ont/cf/parameter/sea_water_density";
    String units "kg.m-3";
  }
  sea_water_temperature {
    UInt32 _ChunkSizes 512;
    Float64 _FillValue -9999.0;
    Float64 actual_range 0.0, 9660.886;
    String gts_ingest "true";
    String id "1001991";
    String ioos_category "Other";
    String long_name "Water Temperature";
    Float64 missing_value -9999.0;
    String platform "station";
    String short_name "sea_water_temperature";
    String standard_name "sea_water_temperature";
    String standard_name_url "http://mmisw.org/ont/cf/parameter/sea_water_temperature";
    String units "degree_Celsius";
  }
  transmission_voltage {
    UInt32 _ChunkSizes 512;
    Float64 _FillValue -9999.0;
    Float64 actual_range 0.0, 3.07;
    String id "1001988";
    String ioos_category "Other";
    String long_name "Transmission (V)";
    Float64 missing_value -9999.0;
    String platform "station";
    String short_name "transmission_voltage";
    String standard_name "transmission_voltage";
    String standard_name_url "http://mmisw.org/ont/unknown/parameter/transmission_voltage";
    String units "V";
  }
  turbidity {
    UInt32 _ChunkSizes 512;
    Float64 _FillValue -9999.0;
    Float64 actual_range -15.13, 29.78;
    String gts_ingest "true";
    String id "1001987";
    String ioos_category "Other";
    String long_name "Turbidity";
    Float64 missing_value -9999.0;
    String platform "station";
    String short_name "turbidity";
    String standard_name "turbidity";
    String standard_name_url "http://mmisw.org/ont/ioos/parameter/turbidity";
    String units "ntu";
  }
  station {
    String cf_role "timeseries_id";
    String ioos_category "Identifier";
    String ioos_code "urn:ioos:station:com.axiomdatascience:54241";
    String long_name "San Luis Bay - Cal Poly Pier Shore";
    String short_name "edu_calpoly_marine_sanluis_sh";
    String type "fixed";
  }
 }
  NC_GLOBAL {
    String _NCProperties "version=2,netcdf=4.7.1,hdf5=1.10.5";
    String acknowledgment "Data collection was supported by multiple awards to Bodega Marine Laboratory, University of California, Davis and an award from NOAA's Integrated Observing System to the Central and Northern California Ocean Observing System at the Monterey Bay Aquarium Research Institute (NA11NOS0120032).";
    String cdm_altitude_proxy "z";
    String cdm_data_type "TimeSeriesProfile";
    String cdm_profile_variables "time";
    String cdm_timeseries_variables "station,longitude,latitude";
    String comment "Data produced by Ryan Walter with partial funding from CeNCOOS (cencoos_communicatons@mbari.org)";
    String contributor_email "cencoos_communications@mbari.org,feedback@axiomdatascience.com";
    String contributor_name "Central & Northern California Ocean Observing System (CeNCOOS),Axiom Data Science";
    String contributor_role "funder,processor";
    String contributor_role_vocabulary "NERC";
    String contributor_url "http://cencoos.org/,https://www.axiomdatascience.com";
    String Conventions "IOOS-1.2, CF-1.6, ACDD-1.3";
    String coverage_content_type "physicalMeasurement";
    String creator_country "USA";
    String creator_email "rkwalter@calpoly.edu";
    String creator_institution "California Polytechnic State Univeristy, San Luis Obispo";
    String creator_name "Ryan Walter";
    String creator_role "pi";
    String creator_sector "academic";
    String creator_type "person";
    String creator_url "http://www.marine.calpoly.edu";
    String defaultDataQuery "turbidity,sea_water_density,sea_water_electrical_conductivity,sea_water_temperature,mass_concentration_of_chlorophyll_in_sea_water,transmission_voltage,z,time,sea_water_practical_salinity&time>=max(time)-3days";
    Float64 Easternmost_Easting -120.74061;
    String featureType "TimeSeriesProfile";
    Float64 geospatial_lat_max 35.17013;
    Float64 geospatial_lat_min 35.17013;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -120.74061;
    Float64 geospatial_lon_min -120.74061;
    String geospatial_lon_units "degrees_east";
    Float64 geospatial_vertical_max 0.0;
    Float64 geospatial_vertical_min -13.0;
    String geospatial_vertical_positive "up";
    String geospatial_vertical_units "m";
    String gts_ingest "true";
    String history 
"Downloaded from California Polytechnic State University, Center for Coastal Marine Sciences at https://cpool1.marine.calpoly.edu/cpool/CCMS_Profiler/Raw/
2025-06-30T08:27:14Z https://cpool1.marine.calpoly.edu/cpool/CCMS_Profiler/Raw/
2025-06-30T08:27:14Z http://erddap.stage.sensors.axds.co/tabledap/edu_calpoly_marine_sanluis_sh.das";
    Int32 id 54241;
    String infoUrl "https://sensors.ioos.us/#metadata/54241/station";
    String institution "California Polytechnic State Univeristy, San Luis Obispo";
    String instrument "SeaBird";
    String ISO_Topic_Categories "Oceans";
    String keywords "Earth Science > Oceans > Ocean Chemistry > Chlorophyll, Earth Science > Oceans > Ocean Optics > Turbidity, 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, Earth Science > Oceans > Water Quality";
    String keywords_vocabulary "GCMD Earth Science Keywords. Version 5.3.3";
    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 "CF-1.6,ACDD-1.3";
    String metadata_link "http://www.marine.calpoly.edu";
    String naming_authority "com.axiomdatascience";
    Float64 Northernmost_Northing 35.17013;
    String platform "Cal Poly Wharf Shore Station";
    String platform_name "San Luis Bay - Cal Poly Pier Shore";
    String platform_vocabulary "http://mmisw.org/ont/ioos/platform";
    String processing_level "Level 2";
    String program "CeNCOOS";
    String project "CeNCOOS";
    String publisher_country "USA";
    String publisher_email "cencoos_communicatons@mbari.org";
    String publisher_institution "California Polytechnic State University, Center for Coastal Marine Sciences";
    String publisher_name "CeNCOOS";
    String publisher_sector "academic";
    String publisher_type "institution";
    String publisher_url "https://www.cencoos.org";
    String references "http://cencoos.org,https://cpool1.marine.calpoly.edu/cpool/CCMS_Profiler/Raw/,http://cencoos.org,";
    String sea_name "NE Pacific";
    String source "Pier Mounted instrument measuring oceanographic parameters";
    String sourceUrl "https://cpool1.marine.calpoly.edu/cpool/CCMS_Profiler/Raw/";
    Float64 Southernmost_Northing 35.17013;
    String standard_name_vocabulary "CF Standard Name Table v72";
    String station_id "54241";
    String summary "The San Luis Bay shore station is located on the Cal Poly Pier and is maintained by Cal Poly San Luis Obispo. The station has been operational since 2003 and consists of an automous profiler, a weather station, flow through seawater system, and a water current profiler. These nearshore sensors are part of the Central and Norther California Ocean Observing System (CeNCOOS). They measure various water quality parameters at fixed points along the California coast.";
    String time_coverage_end "2023-07-04T23:42:00Z";
    String time_coverage_start "2017-09-01T00:03:00Z";
    String title "CeNCOOS in situ water quality monitoring at the Cal Poly Pier San Luis Obispo";
    Float64 Westernmost_Easting -120.74061;
  }
}

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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