Data Access Form

Dataset Title:	Daily Data Usage ERD/SWFWSC ERDDAP, total request, data volume, unique visitors
Institution:	CoastWatch West Coast Node (Dataset ID: erddap_log_swfsc)
Information:	Summary \| License \| Metadata \| Background \| Files \| Make a graph

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Variable	Minimum	Maximum
time (UTC)	2024-08-01T12:00:00Z	2025-02-04T12:00:00Z

data_requests	95519.95	1086663.0
data_volume (Total Data Volume, Mb)	24951.46991316103	1164620.4010645803
unique_visitors	2003	11314
percent_successful_request	53	95
percent_failed_request	5	47

Server-side Functions

distinct()

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File type: (more information)

(Documentation / Bypass this form )

(Please be patient. It may take a while to get the data.)

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.
2025-05-01T00:26:51Z (local files)
2025-05-01T00:26:51Z https://coastwatch.pfeg.noaa.gov/wcn/erddap/tabledap/erddap_log_swfsc.html";
    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.