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ERDDAP > tabledap > Make A Graph ?

Dataset Title:  Virginia HABs Subscribe RSS
Institution:  NCCOS   (Dataset ID: habs_3792_165c_4f55)
Range: longitude = -77.386 to -75.0111°E, latitude = 17.5243 to 39.2451°N
Information:  Summary ? | License ? | FGDC | ISO 19115 | Metadata | Background (external link) | Subset | Data Access Form | Files
 
Graph Type:  ?
X Axis: 
Y Axis: 
Color: 
-1+1
 
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.Hover here to see a list of options. Click on an option to select it.Hover here to see a list of options. Click on an option to select it.Hover here to see a list of options. Click on an option to select it.")
 
Graph Settings
Marker Type:   Size: 
Color: 
Color Bar:   Continuity:   Scale: 
   Minimum:   Maximum:   N Sections: 
Draw land mask: 
Y Axis Minimum:   Maximum:   
 
(Please be patient. It may take a while to get the data.)
 
Optional:
Then set the File Type: (File Type information)
and
or view the URL:
(Documentation / Bypass this form ? )
    Click on the map to specify a new center point. ?
Zoom: 
Time range:           -   +  
[The graph you specified. Please be patient.]

 

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:

The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  source_file {
    String ioos_category "Unknown";
    String long_name "Source File";
  }
  agency {
    String ioos_category "Unknown";
    String long_name "Agency";
  }
  station {
    String ioos_category "Identifier";
    String long_name "Station";
  }
  sample_id {
    String ioos_category "Identifier";
    String long_name "Sample Id";
  }
  time {
    String _CoordinateAxisType "Time";
    String axis "T";
    String ioos_category "Time";
    String long_name "Date";
    String source_name "date";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String time_precision "1970-01-01";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  collection_time {
    String ioos_category "Time";
    String long_name "Collection Time";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float32 _FillValue NaN;
    Float32 actual_range 17.5243, 39.2451;
    String axis "Y";
    Float64 colorBarMaximum 90.0;
    Float64 colorBarMinimum -90.0;
    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 -77.386, -75.0111;
    String axis "X";
    Float64 colorBarMaximum 180.0;
    Float64 colorBarMinimum -180.0;
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  cells_per_liter {
    Float64 _FillValue NaN;
    Float64 actual_range 0.0, 1.055036e+9;
    String ioos_category "Unknown";
    String long_name "Cells Per Liter";
    String units "cells/L";
  }
  species {
    String ioos_category "Taxonomy";
    String long_name "Species";
  }
  method {
    String ioos_category "Unknown";
    String long_name "Method";
  }
  temp_c {
    Float32 _FillValue NaN;
    Float32 actual_range 0.2, 29575.0;
    String ioos_category "Unknown";
    String long_name "temperature";
    String units "celcius";
  }
  sal_ppt {
    Float32 _FillValue NaN;
    Float32 actual_range 0.0, 179.0;
    String ioos_category "Unknown";
    String long_name "salinity";
    String units "ppt";
  }
  do_mg_l {
    Float32 _FillValue NaN;
    Float32 actual_range 0.0, 833.0;
    String ioos_category "Unknown";
    String long_name "dissolved_oxygen";
    String units "mgl";
  }
  ph {
    Float32 _FillValue NaN;
    Float32 actual_range 0.36, 19.5;
    Float64 colorBarMaximum 9.0;
    Float64 colorBarMinimum 7.0;
    String ioos_category "Salinity";
    String long_name "Sea Water Ph Reported On Total Scale";
    String standard_name "sea_water_ph_reported_on_total_scale";
  }
  chla_ug_l {
    Float64 _FillValue NaN;
    Float64 actual_range 1.27, 1768.0;
    Float64 colorBarMaximum 30.0;
    Float64 colorBarMinimum 0.03;
    String colorBarScale "Log";
    String ioos_category "Ocean Color";
    String long_name "Concentration Of Chlorophyll In Sea Water";
    String standard_name "concentration_of_chlorophyll_in_sea_water";
    String units "ugl";
  }
  bga {
    Float32 _FillValue NaN;
    Float32 actual_range 0.44, 455.95;
    String ioos_category "Unknown";
    String long_name "blue_green_algae";
  }
  comments {
    String ioos_category "Unknown";
    String long_name "Comments";
  }
  pres_abs {
    String ioos_category "Unknown";
    String long_name "Pres Abs";
  }
  secchi_m {
    Float32 _FillValue NaN;
    Float32 actual_range 0.0, 25.6;
    String ioos_category "Unknown";
    String long_name "Secchi M";
  }
  indicators {
    String ioos_category "Unknown";
    String long_name "Indicators";
  }
  cells_per_ml {
    Float64 _FillValue NaN;
    Float64 actual_range 0.0, 1055036.0;
    String ioos_category "Unknown";
    String long_name "Cells Per Ml";
    String units "cells/L";
  }
  secchi_indicator {
    String ioos_category "Unknown";
    String long_name "Secchi Indicator";
  }
  duplicate {
    String ioos_category "Unknown";
    String long_name "Duplicate";
  }
 }
  NC_GLOBAL {
    String cdm_data_type "Other";
    String Conventions "COARDS, CF-1.10, ACDD-1.3";
    Float64 Easternmost_Easting -75.0111;
    Float64 geospatial_lat_max 39.2451;
    Float64 geospatial_lat_min 17.5243;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -75.0111;
    Float64 geospatial_lon_min -77.386;
    String geospatial_lon_units "degrees_east";
    String history 
"2026-06-30T04:32:49Z (local files)
2026-06-30T04:32:49Z http://erddap.maracoos.org/tabledap/habs_3792_165c_4f55.das";
    String infoUrl "??";
    String institution "NCCOS";
    String keywords "abs, agency, altimetry, bga, cells, cells_per_liter, cells_per_ml, chemistry, chla_ug_l, chlorophyll, collection, collection_time, color, comments, concentration, concentration_of_chlorophyll_in_sea_water, data, date, do_mg_l, duplicate, earth, Earth Science > Oceans > Ocean Chemistry > Chlorophyll, Earth Science > Oceans > Ocean Chemistry > pH, file, identifier, index, indicator, indicators, laboratory, latitude, liter, local, longitude, method, ocean, ocean color, oceans, per, ppt, pres, pres_abs, reported, sal, sal_ppt, salinity, sample, sample_id, satellite, scale, science, sea, sea_water_ph_reported_on_total_scale, seawater, secchi, secchi_indicator, secchi_m, source, source_file, species, station, taxonomy, temp_c, temperature, time, total, water";
    String keywords_vocabulary "GCMD Science Keywords";
    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.";
    Float64 Northernmost_Northing 39.2451;
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 17.5243;
    String standard_name_vocabulary "CF Standard Name Table v70";
    String subsetVariables "duplicate";
    String summary "Data from a local source.";
    String title "Virginia HABs";
    Float64 Westernmost_Easting -77.386;
  }
}

 

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.

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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