Make A Graph

Dataset Title:	USDOC/NOAA/NESDIS ECDC USC Vibrio Risk Analysis
Institution:	CoastWatch Caribb-NOAA AOML ECDC USC/IIT (Dataset ID: vibriorisk)
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Data Access Form

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Graph Type:
X Axis:
Y Axis:
Color:

Dimensions

Start

Stop

time (UTC)

specify just 1 value →

latitude (degrees_north)

longitude (degrees_east)

Graph Settings
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:

[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:

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 {
  time {
    Int32 _ChunkSizes 1;
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.3710384e+9, 1.7327952e+9;
    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";
  }
  latitude {
    Int32 _ChunkSizes 3600;
    String _CoordinateAxisType "Lat";
    Float32 actual_range -89.975, 89.975;
    String axis "Y";
    String ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    Int32 _ChunkSizes 7200;
    String _CoordinateAxisType "Lon";
    Float32 actual_range -179.975, 179.975;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  daily_vibrio_risk {
    Int32 _ChunkSizes 1, 3600, 7200;
    Float32 _FillValue NaN;
    Float32 actual_range 0.030029297, 41.664;
    Float64 colorBarMaximum 20.0;
    Float64 colorBarMinimum 0.0;
    String coordsys "geographic";
    String ioos_category "Pathogens";
    String long_name "Daily Vibrio Risk";
    String palette_info_variable "Uncertain";
    String standard_name "daily vibrio risk";
    String units "Risk Level";
    String variable_info "To be Completed";
  }
  NC_GLOBAL {
    String cdm_data_type "Grid";
    Int16 cols 7200;
    String comment "This is a collaborative project involving NOAA CoastWatch, the European Centre for Disease Prevention and Control ECDC and the Universidade de Santiago de Compostela";
    String Conventions "COARDS, CF-1.0, Unidata Dataset Discovery v1.0";
    String data_source "USDOC/NOAA/NESDIS COASTWATCH";
    Float64 Easternmost_Easting 179.975;
    Float64 geospatial_lat_max 89.975;
    Float64 geospatial_lat_min -89.975;
    Float64 geospatial_lat_resolution 0.049999999999999996;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 179.975;
    Float64 geospatial_lon_min -179.975;
    Float64 geospatial_lon_resolution 0.049999999999999996;
    String geospatial_lon_units "degrees_east";
    String history 
"2024-12-04T20:58:45Z https://cwcgom.aoml.noaa.gov/thredds/dodsC/VIBRIO_RISK/RISK.nc
2024-12-04T20:58:45Z http://cwcgom.aoml.noaa.gov:8080/griddap/vibriorisk.das";
    String infoUrl "https://www.nature.com/nclimate/journal/v3/n1/nclimate1628/metrics/news";
    String institution "CoastWatch Caribb-NOAA AOML ECDC USC/IIT";
    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 NCO "netCDF Operators version 4.8.1 (Homepage = http://nco.sf.net, Code = https://github.com/nco/nco)";
    Int32 nco_openmp_thread_number 1;
    Int32 node_offset 0;
    Float64 Northernmost_Northing 89.975;
    String origin "USDOC/NOAA/NESDIS COASTWATCH";
    Int16 rows 3600;
    String sourceUrl "https://cwcgom.aoml.noaa.gov/thredds/dodsC/VIBRIO_RISK/RISK.nc";
    Float64 Southernmost_Northing -89.975;
    String standard_name_vocabulary "CF-1.0";
    String summary "Preliminary and experimental Vibrio Risk fields";
    Float64 temporal_extent 86400.0;
    String temporal_extent_unit "seconds";
    String time_coverage_end "2024-11-28T12:00:00Z";
    String time_coverage_start "2013-06-12T12:00:00Z";
    String title "USDOC/NOAA/NESDIS ECDC USC Vibrio Risk Analysis";
    Float64 Westernmost_Easting -179.975;
  }
}

Using griddap to Request Data and Graphs from Gridded Datasets

griddap lets you request a data subset, graph, or map from a gridded dataset (for example, sea surface temperature data from a satellite), via a specially formed URL. griddap uses the OPeNDAP (external link)

Data Access Protocol (DAP) (external link)

and its projection 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. It makes 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.

griddap request URLs must be in the form
https://coastwatch.pfeg.noaa.gov/erddap/griddap/datasetID.fileType{?query}
For example,
https://coastwatch.pfeg.noaa.gov/erddap/griddap/jplMURSST41.htmlTable?analysed_sst[(2002-06-01T09:00:00Z)][(-89.99):1000:(89.99)][(-179.99):1000:(180.0)]
Thus, the query is often a data variable name (e.g., analysed_sst), followed by [(start):stride:(stop)] (or a shorter variation of that) for each of the variable's dimensions (for example, [time][latitude][longitude]).

For details, see the griddap Documentation.