Make A Graph

Dataset Title:	ECOHAB_I - 4351sc-a
Institution:	Coastal and Marine Hazards and Resources Program, U.S. Geological Survey (Dataset ID: ECOHAB_I_4351sc_a_cdf)
Range:	longitude = -70.255 to -70.255°E, latitude = 43.302 to 43.302°N, time = 1994-03-25T20:33:45Z to 1994-09-08T17:26:15Z
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 
"ECOHAB_I_4351sc_a_cdf
ECOHAB_I_4351sc_a_cdf";
    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 43.302, 43.302;
    String axis "Y";
    String ioos_category "Location";
    String long_name "sensor latitude";
    String standard_name "latitude";
    String units "degrees_north";
    Float32 valid_max 43.302;
    Float32 valid_min 43.302;
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float32 actual_range -70.255, -70.255;
    String axis "X";
    String ioos_category "Location";
    String long_name "sensor longitude";
    String standard_name "longitude";
    String units "degrees_east";
    Float32 valid_max -70.255;
    Float32 valid_min -70.255;
  }
  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 "4351sc-a";
    String long_name "USGS-CMG time-series data from the Ecology of Harmful Algal Blooms (ECOHAB-I) project, mooring 435 and package 4351sc-a. A field program to study the transport and fate of toxic dinoflagellate blooms in the western Gulf of Maine.";
    String nodc_name "FIXED PLATFORM, MOORINGS";
    String short_name "USGS-CMG time-series data: ECOHAB_I - 435 - 4351sc-a";
    String type "fixed";
  }
  time {
    UInt32 _ChunkSizes 1000;
    String _CoordinateAxisType "Time";
    Float64 actual_range 7.64627625e+8, 7.79045175e+8;
    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 -5.0, -5.0;
    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 -5.0;
    Float32 valid_min -5.0;
  }
  C_50 {
    UInt32 _ChunkSizes 1000;
    Float32 actual_range 2.795427, 4.318359;
    String ancillary_variables "platform";
    String coordinates "time z latitude longitude";
    String coverage_content_type "physicalMeasurement";
    Int32 epic_code 50;
    String FillValue "-9999.900390625";
    String generic_name "con";
    String grid_mapping "crs";
    String ioos_category "Other";
    String long_name "Conductivity";
    Float32 missing_value -9999.9;
    String platform "platform";
    Float32 sensor_depth 5.0;
    String serial_number "SC-356";
    String standard_name "sea_water_electrical_conductivity";
    String units "S/m";
  }
  STH_71 {
    UInt32 _ChunkSizes 1000;
    Float32 actual_range 21.5799, 25.9538;
    String ancillary_variables "platform";
    String coordinates "time z latitude longitude";
    String coverage_content_type "physicalMeasurement";
    Int32 epic_code 71;
    String FillValue "-9999.900390625";
    String FORTRAN_format "f10.2";
    String generic_name "potden";
    String grid_mapping "crs";
    String ioos_category "Other";
    String long_name "Sigma-theta of sea water";
    Float32 missing_value -9999.9;
    String platform "platform";
    Float32 sensor_depth 5.0;
    String serial_number "SC-356";
    String standard_name "sea_water_sigma_theta";
    String units "kg/m^3";
  }
  S_40 {
    UInt32 _ChunkSizes 1000;
    Float32 actual_range 27.5613, 32.9017;
    String ancillary_variables "platform";
    String coordinates "time z latitude longitude";
    String coverage_content_type "physicalMeasurement";
    Int32 epic_code 40;
    String FillValue "-9999.900390625";
    String FORTRAN_format "f10.2";
    String generic_name "sal";
    String grid_mapping "crs";
    String ioos_category "Other";
    String long_name "Salinity";
    Float32 missing_value -9999.9;
    String platform "platform";
    Float32 sensor_depth 5.0;
    String serial_number "SC-356";
    String standard_name "sea_water_practical_salinity";
    String units "1e-3";
  }
  T_20 {
    UInt32 _ChunkSizes 1000;
    Float32 actual_range 2.015686, 20.18771;
    String ancillary_variables "platform";
    String coordinates "time z latitude longitude";
    String coverage_content_type "physicalMeasurement";
    Int32 epic_code 20;
    String FillValue "-9999.900390625";
    String FORTRAN_format "f10.2";
    String generic_name "temp";
    String grid_mapping "crs";
    String ioos_category "Other";
    String long_name "Water Temperature";
    Float32 missing_value -9999.9;
    String platform "platform";
    Float32 sensor_depth 5.0;
    String serial_number "SC-356";
    String standard_name "sea_water_temperature";
    String units "degree_Celsius";
  }
 }
  NC_GLOBAL {
    String cdm_data_type "TimeSeries";
    String cdm_timeseries_variables "station_id";
    Int32 COMPOSITE 0;
    String contributor_name "R. Signell";
    String contributor_role "principalInvestigator";
    String Conventions "COARDS, CF-1.6, ACDD-1.3";
    String COORD_SYSTEM "GEOGRAPHICAL";
    String CREATION_DATE "10:32 25-APR-97";
    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";
    Int32 cycles 32040;
    String DATA_ORIGIN "USGS/WHFC";
    String DATA_TYPE "TIME";
    String date_created "2017-04-11T21:57:00Z";
    String date_issued "2017-04-11T21:57:00Z";
    String date_metadata_modified "2017-04-11T21:57:00Z";
    String date_modified "2017-04-11T21:57:00Z";
    String DELTA_T "7.5000 minutes";
    Int32 DEPTH_CONST 0;
    String DESCRIPT "SEACAT GOM CAPE PORPOISE OFFSHORE:  CLEAN DATA, NOT SCRUBBED";
    Int32 DRIFTER 0;
    Float64 Easternmost_Easting -70.255;
    String experiment_name "ECOHAB_I";
    String featureType "TimeSeries";
    Int32 FILL_FLAG 0;
    String geospatial_bounds "POINT(-70.25499725341797 43.301998138427734)";
    String geospatial_bounds_crs "EPSG:4326";
    Float64 geospatial_lat_max 43.302;
    Float64 geospatial_lat_min 43.302;
    Float64 geospatial_lat_resolution 0;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -70.255;
    Float64 geospatial_lon_min -70.255;
    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 20:15:29 2019: ncatted -a project,global,a,c,, CMG_Portal ECOHAB_I/4351sc-a.cdf
Converted to EPIC Wed Nov 13 15:21:34 1996
Changed epic code 20 to 20 on Thu Apr 24 18:26:25 1997

2017-04-11T21:57:00Z - pyaxiom - File created using pyaxiom
2024-12-12T06:31:08Z (local files)
2024-12-12T06:31:08Z https://cmgds.marine.usgs.gov/tabledap/ECOHAB_I_4351sc_a_cdf.das";
    String id "4351sc-a";
    String infoUrl "https://cmgds.marine.usgs.gov/ocean-time-series/";
    String INST_TYPE "SC-356";
    String institution "Coastal and Marine Hazards and Resources Program, U.S. Geological Survey";
    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 43.302;
    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 -70.255;
    String magnetic_variation_deg "0.0";
    Float64 MOORING 435;
    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 43.302;
    String original_filename "4351sc-a.cdf";
    String original_folder "ECOHAB_I";
    Int32 POS_CONST 0;
    String project "U.S. Geological Survey Oceanographic Time-Series Data, CMG_Portal";
    String project_summary "A field program to study the transport and fate of toxic dinoflagellate blooms in the western Gulf of Maine.";
    String project_title "Ecology of Harmful Algal Blooms (ECOHAB-I)";
    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 source "USGS";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 43.302;
    String standard_name_vocabulary "CF-1.6";
    String start_time "25-Mar-1994 20:33:45";
    String stop_time "08-Sep-1994 17:26:15";
    String subsetVariables "station_id";
    String summary "ECOHAB_I - 4351sc-a";
    String time_coverage_duration "PT14417550S";
    String time_coverage_end "1994-09-08T17:26:15Z";
    String time_coverage_start "1994-03-25T20:33:45Z";
    String title "ECOHAB_I - 4351sc-a";
    String VAR_DESC "temp :: con :: sal :: potden ";
    Int32 WATER_DEPTH 87;
    String water_depth_m "87.0";
    String WATER_MASS "?";
    Float64 Westernmost_Easting -70.255;
  }
}

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.