Make A Graph

Dataset Title:	LYDONIA_C - 2051IP-A
Institution:	Coastal and Marine Hazards and Resources Program, U.S. Geological Survey (Dataset ID: LYDONIA_C_2051IP_A_cdf)
Range:	longitude = -67.63689 to -67.63689°E, latitude = 40.54667 to 40.54667°N, time = 1980-11-25T23:33:45Z to 1981-05-03T00:26:15Z
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Subset \| Data Access Form \| Files

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Server-side Functions

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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 
"LYDONIA_C_2051IP_A_cdf
LYDONIA_C_2051IP_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 40.54667, 40.54667;
    String axis "Y";
    String ioos_category "Location";
    String long_name "sensor latitude";
    String standard_name "latitude";
    String units "degrees_north";
    Float32 valid_max 40.546665;
    Float32 valid_min 40.546665;
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float32 actual_range -67.63689, -67.63689;
    String axis "X";
    String ioos_category "Location";
    String long_name "sensor longitude";
    String standard_name "longitude";
    String units "degrees_east";
    Float32 valid_max -67.63689;
    Float32 valid_min -67.63689;
  }
  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 "2051IP-A";
    String long_name "USGS-CMG time-series data from the Lydonia Canyon Dynamics Experiment project, mooring 205 and package 2051IP-A. A major field experiment to determine the importance of submarine canyons in sediment transport along and across the continental margin.";
    String nodc_name "FIXED PLATFORM, MOORINGS";
    String short_name "USGS-CMG time-series data: LYDONIA_C - 205 - 2051IP-A";
    String type "fixed";
  }
  time {
    UInt32 _ChunkSizes 1000;
    String _CoordinateAxisType "Time";
    Float64 actual_range 3.44043225e+8, 3.57697575e+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 0.0, 0.0;
    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 0.0;
    Float32 valid_min 0.0;
  }
  P_4022 {
    UInt32 _ChunkSizes 1000;
    Float32 actual_range 134.468, 136.223;
    String ancillary_variables "platform";
    String code "R";
    String coordinates "time z latitude longitude";
    String coverage_content_type "physicalMeasurement";
    Int32 epic_code 4022;
    String FillValue "-9999.900390625";
    String FORTRAN_format "f10.3";
    String generic_name "pres";
    String grid_mapping "crs";
    String ioos_category "Other";
    String long_name "Sea Water Pressure (interval)";
    Float32 missing_value -9999.9;
    String platform "platform";
    Float32 sensor_depth 0.0;
    String standard_name "sea_water_pressure";
    String units "dbar";
  }
 }
  NC_GLOBAL {
    String cdm_data_type "TimeSeries";
    String cdm_timeseries_variables "station_id";
    Int32 COMPOSITE 0;
    String contributor_name "B. Butman";
    String contributor_role "principalInvestigator";
    String Conventions "COARDS, CF-1.6, ACDD-1.3";
    String COORD_SYSTEM "GEOGRAPHICAL";
    String CREATION_DATE "08:24 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 30344;
    String DATA_CMNT 
" PRESSURE RECORD FOR 2051 FILLED USING 2031 AND FIXING DECK B.\r
";
    String DATA_ORIGIN "USGS/WHFC";
    String DATA_TYPE "TIME";
    String date_created "2017-04-11T22:06:00Z";
    String date_issued "2017-04-11T22:06:00Z";
    String date_metadata_modified "2017-04-11T22:06:00Z";
    String date_modified "2017-04-11T22:06:00Z";
    Int32 days 158;
    String DELTA_T 
"7.50 minutes\r
";
    Int32 DEPTH_CONST 0;
    String DESCRIPT "?";
    Int32 DRIFTER 0;
    Float64 Easternmost_Easting -67.63689;
    String EXPERIMENT "?";
    String experiment_name "LYDONIA_C";
    String featureType "TimeSeries";
    Int32 FILL_FLAG 0;
    String geospatial_bounds "POINT(-67.63688659667969 40.54666519165039)";
    String geospatial_bounds_crs "EPSG:4326";
    Float64 geospatial_lat_max 40.54667;
    Float64 geospatial_lat_min 40.54667;
    Float64 geospatial_lat_resolution 0;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -67.63689;
    Float64 geospatial_lon_min -67.63689;
    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 20:15:47 2019: ncatted -a project,global,a,c,, CMG_Portal LYDONIA_C/2051IP-A.cdf
Original file creation date was 16:15 SEP 12,'84\r
Converted to EPIC/NetCDF Fri Dec  6 12:30:10 1996

Original ascii file was a2051p01.ascChanged epic code 4026 to 4022 on Thu Apr 24 18:14:01 1997

2017-04-11T22:06:00Z - pyaxiom - File created using pyaxiom
2024-12-12T10:33:54Z (local files)
2024-12-12T10:33:54Z https://cmgds.marine.usgs.gov/tabledap/LYDONIA_C_2051IP_A_cdf.das";
    String id "2051IP-A";
    String infoUrl "https://cmgds.marine.usgs.gov/ocean-time-series/";
    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 40.546665;
    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 -67.63689;
    String magnetic_variation_deg "-17.0";
    Float64 MOORING 205;
    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 40.54667;
    String original_filename "2051IP-A.cdf";
    String original_folder "LYDONIA_C";
    Int32 POS_CONST 0;
    String PROJECT "?";
    String project "U.S. Geological Survey Oceanographic Time-Series Data, CMG_Portal";
    String project_summary "A major field experiment to determine the importance of submarine canyons in sediment transport along and across the continental margin.";
    String project_title "Lydonia Canyon Dynamics Experiment";
    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 40.54667;
    String standard_name_vocabulary "CF-1.6";
    String start_time "25-Nov-1980 23:33:45";
    String stop_time "03-May-1981 00:26:15";
    String subsetVariables "station_id";
    String summary "LYDONIA_C - 2051IP-A";
    String time_coverage_duration "PT13654350S";
    String time_coverage_end "1981-05-03T00:26:15Z";
    String time_coverage_start "1980-11-25T23:33:45Z";
    String title "LYDONIA_C - 2051IP-A";
    String VAR_DESC "trans ";
    Int32 WATER_DEPTH 125;
    String WATER_MASS "?";
    Float64 Westernmost_Easting -67.63689;
    String WHOI_Buoy_Group_summary 
"2051IP-A       start time = 25 Nov 1980  18:33:45  cycles = 30344
               stop  time =  2 May 1981  19:26:15  # days = 158
Expt. = 'USGS'  sampling interval = 7.50 minutes
Lat =  40.546665
Lon = -67.636887  File created:  16:15 SEP 12,'84
depth = 125m  Mag.var = -17.000000
#  Variable     Units        Codes Depth   Inst.   Minimum   Maximum
-- ------------ ------------ ----- ------- ------ --------- ---------
 1 TIME         SECONDS      T     
 2 PRESSURE-I   MILLIBARS    R        0.00        13400.000 13600.000
---------------------------------------------------------------------
 Comments:                                                      U_MOVFIL
 PRESSURE RECORD FOR 2051 FILLED USING 2031 AND FIXING DECK B.
 VARIABLES LISTED IN ORDER SHOWN ABOVE
";
  }
}

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.