Make A Graph

Dataset Title:	Daily Data Usage ERD/SWFWSC ERDDAP, total request, data volume, unique visitors
Institution:	CoastWatch West Coast Node (Dataset ID: erddap_log_swfsc)
Range:	time = 2024-08-01T12:00:00Z to 2025-02-04T12:00:00Z
Information:	Summary \| License \| Metadata \| Background \| Data Access Form \| Files

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Graph Type:

X Axis:

Y Axis:

Color:

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.

Graph Settings

Marker Type:

Size:

Color:

Color Bar:

Continuity:

Scale:

Minimum:

Maximum:

N Sections:

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

)

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:

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 {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.7225136e+9, 1.7386704e+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 time_precision "1970-01-01T00:00:00Z";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  data_requests {
    Float32 _FillValue -999.0;
    Float32 actual_range 95519.95, 1086663.0;
    String ioos_category "Unknown";
    String long_name "Data Requests";
  }
  data_volume {
    Float64 _FillValue -999.0;
    Float64 actual_range 24951.46991316103, 1164620.4010645803;
    String ioos_category "Unknown";
    String long_name "Total Data Volume";
    String units "Mb";
  }
  unique_visitors {
    Int32 _FillValue -999;
    Int32 actual_range 2003, 11314;
    String ioos_category "Unknown";
    String long_name "Unique Visitors";
  }
  percent_successful_request {
    Byte _FillValue 127;
    String _Unsigned "false";
    Byte actual_range 53, 95;
    Float64 colorBarMaximum 100.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Unknown";
    String long_name "Successful Request (Percent of Total)";
  }
  percent_failed_request {
    Byte _FillValue 127;
    String _Unsigned "false";
    Byte actual_range 5, 47;
    Float64 colorBarMaximum 100.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Unknown";
    String long_name "Failed Requests (Percent of Total)";
  }
 }
  NC_GLOBAL {
    String cdm_data_type "Other";
    String Conventions "COARDS, CF-1.10, ACDD-1.3";
    String history 
"Data access logs form the ERDDAP server at https://coastwatch.pfeg.noaa.gov/erddap were processed to obtain usage information for hosted datasets.
2025-04-30T20:46:53Z (local files)
2025-04-30T20:46:53Z https://coastwatch.pfeg.noaa.gov/wcn/tabledap/erddap_log_swfsc.das";
    String infoUrl "https://coastwatch.pfeg.noaa.gov/";
    String institution "CoastWatch West Coast Node";
    String keywords "data, data_requests, data_volume, failed, local, meteorology, percent, percent_failed_request, percent_successful_request, request, requests, source, successful, time, unique, unique_visitors, visitors, volume";
    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 sourceUrl "(local files)";
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary "Data access logs for the ERDDAP server operated by the ITDS Division of SWFSC";
    String time_coverage_end "2025-02-04T12:00:00Z";
    String time_coverage_start "2024-08-01T12:00:00Z";
    String title "Daily Data Usage ERD/SWFWSC ERDDAP, total request, data volume, unique visitors";
  }
}

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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