Make A Graph

Dataset Title:	PolarWatch ERDDAP Data Usage
Institution:	NOAA/NESDIS/CoastWatch/PolarWatch (Dataset ID: polarwatch_datause_monthly)
Range:	time = 2021-01-15T00:00:00Z to 2024-03-15T00:00:00Z
Information:	Summary \| License \| Metadata \| Background \| Subset \| 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 {
  dataset_id {
    String ioos_category "Identifier";
    String long_name "ERDDAP Dataset ID";
  }
  data_volume {
    Float64 _FillValue -999;
    Float64 actual_range 0, 282025;
    String ioos_category "Unknown";
    String long_name "Total Monthly Data Volume";
    String units "Mb";
  }
  requests {
    Int32 _FillValue -999;
    Int32 actual_range 0, 361817;
    String ioos_category "Unknown";
    String long_name "Total Monthly Requests for Data";
  }
  nc_req {
    Int32 _FillValue -999;
    Int32 actual_range 0, 20095;
    String ioos_category "Unknown";
    String long_name "Monthly Requests for Data in NetCDF Format";
  }
  dods_req {
    Int32 _FillValue -999;
    Int32 actual_range 0, 95995;
    String ioos_category "Unknown";
    String long_name "Monthly OpenDAP Requests";
  }
  text_req {
    Int32 _FillValue -999;
    Int32 actual_range 0, 324584;
    String comment "File type include CSV, ASCII, TXT, tab-separated, and html files";
    String ioos_category "Unknown";
    String long_name "Monthly Requests for Data in Text Format";
  }
  metadata_req {
    Int32 _FillValue -999;
    Int32 actual_range 0, 2213;
    String ioos_category "Unknown";
    String long_name "Monthly Requests for Metadata";
  }
  graph_req {
    Int32 _FillValue -999;
    Int32 actual_range 0, 44427;
    String ioos_category "Unknown";
    String long_name "Monthly Requests for Graphics";
  }
  json_req {
    Int32 _FillValue -999;
    Int32 actual_range 0, 28981;
    String ioos_category "Unknown";
    String long_name "Monthly Requests for Data in JSON Format";
  }
  mat_req {
    Int32 _FillValue -999;
    Int32 actual_range 0, 17;
    String ioos_category "Unknown";
    String long_name "Monthly Requests for Data in MATLAB Format";
  }
  images_req {
    Int32 _FillValue -999;
    Int32 actual_range 0, 2835;
    String ioos_category "Unknown";
    String long_name "Monthly Requests for Images";
  }
  file_downloads_req {
    Int16 _FillValue -999;
    Int16 actual_range 0, 0;
    String ioos_category "Unknown";
    String long_name "Monthly Requests to Download Tiles";
  }
  other_req {
    Int32 _FillValue -999;
    Int32 actual_range 0, 0;
    String ioos_category "Unknown";
    String long_name "Monthly Requests Data in Other Formats";
  }
  nc_volume {
    Float32 _FillValue -999.0;
    Float32 actual_range 0.0, 2.563168e+8;
    String ioos_category "Unknown";
    String long_name "Monthly Data Volume in NetCDF Format";
    String units "Kb";
  }
  dods_volume {
    Float32 _FillValue -999.0;
    Float32 actual_range 0.0, 7718136.0;
    String ioos_category "Unknown";
    String long_name "Monthly Data Volume in Dods Format";
    String units "Kb";
  }
  text_volume {
    Float32 _FillValue -999.0;
    Float32 actual_range 0.0, 7.3614464e+7;
    String ioos_category "Unknown";
    String long_name "Monthly Data Volume in Text Format";
    String units "Kb";
  }
  metadata_volume {
    Float32 _FillValue -999.0;
    Float32 actual_range 0.0, 898905.5;
    String ioos_category "Unknown";
    String long_name "Monthly Data Volume for Metadata";
    String units "Kb";
  }
  graph_volume {
    Float32 _FillValue -999.0;
    Float32 actual_range 0.0, 2862833.0;
    String ioos_category "Unknown";
    String long_name "Monthly Data Volume for Graphs";
    String units "Kb";
  }
  json_volume {
    Float32 _FillValue -999.0;
    Float32 actual_range 0.0, 2568613.0;
    String ioos_category "Unknown";
    String long_name 
"Monthly Data Volume in Json
            format";
    String units "Kb";
  }
  mat_volume {
    Float32 _FillValue -999.0;
    Float32 actual_range 0.0, 1093434.0;
    String ioos_category "Unknown";
    String long_name "Monthly Data Volume in MATLAB Format";
    String units "Kb";
  }
  images_volume {
    Float32 _FillValue -999.0;
    Float32 actual_range 0.0, 77974.86;
    String ioos_category "Unknown";
    String long_name "Monthly Data Volume for Images";
    String units "Kb";
  }
  file_downloads_volume {
    Float32 _FillValue -999.0;
    Float32 actual_range 0.0, 0.0;
    String comment "FTP-like file downloads";
    String ioos_category "Unknown";
    String long_name "Monthly Data Volume for Whole File Downloads Size";
    String units "Kb";
  }
  other_size {
    Float32 _FillValue -999.0;
    Float32 actual_range 0.0, 0.0;
    String ioos_category "Unknown";
    String long_name "Monthly Data Volume Other File Types";
    String units "Kb";
  }
  requests_redirect {
    Int32 _FillValue -999;
    Int32 actual_range 0, 494521;
    String ioos_category "Unknown";
    String long_name "Total Redirected Requests";
  }
  nc_req_redirect {
    Int32 _FillValue -999;
    Int32 actual_range 0, 27821;
    String ioos_category "Unknown";
    String long_name "Redirected Requests for NetCDF Files";
  }
  dods_req_redirect {
    Int32 _FillValue -999;
    Int32 actual_range 0, 282;
    String ioos_category "Unknown";
    String long_name "Redirected Dods Requests";
  }
  text_req_redirect {
    Int32 _FillValue -999;
    Int32 actual_range 0, 2070;
    String ioos_category "Unknown";
    String long_name "Redirected Requests for Text Files";
  }
  metadata_req_redirect {
    Int32 _FillValue -999;
    Int32 actual_range 0, 2060;
    String ioos_category "Unknown";
    String long_name "Redirected Requests for Metadata";
  }
  graph_req_redirect {
    Int32 _FillValue -999;
    Int32 actual_range 0, 0;
    String ioos_category "Unknown";
    String long_name "Redirected Requests for Graphs";
  }
  json_req_redirect {
    Int32 _FillValue -999;
    Int32 actual_range 0, 52382;
    String ioos_category "Unknown";
    String long_name "Redirected Requests for JSON Files";
  }
  mat_req_redirect {
    Int32 _FillValue -999;
    Int32 actual_range 0, 20;
    String ioos_category "Unknown";
    String long_name "Redirected Requests for MATLAB Files";
  }
  images_req_redirect {
    Int32 _FillValue -999;
    Int32 actual_range 0, 20846;
    String ioos_category "Unknown";
    String long_name "Redirected Requests for Images";
  }
  file_download_req_redirect {
    Int32 _FillValue -999;
    Int32 actual_range 0, 455964;
    String ioos_category "Unknown";
    String long_name "Redirected Requests for File Downloads";
  }
  other_req_redirect {
    Int32 _FillValue -999;
    Int32 actual_range 0, 136;
    String ioos_category "Unknown";
    String long_name "Redirected Requests for Other File Types";
  }
  unique_visitors {
    Int16 _FillValue -999;
    Int16 actual_range 1, 358;
    String ioos_category "Unknown";
    String long_name "Unique Visitors";
  }
  time_epoch {
    Float64 _FillValue -999.0;
    Float64 actual_range 1.6106976e+9, 1.710486e+9;
    String ioos_category "Time";
    String long_name "Time Epoch";
  }
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.6106688e+9, 1.7104608e+9;
    String axis "T";
    String ioos_category "Time";
    String long_name "Time";
    String source_name "time_iso";
    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";
  }
 }
  NC_GLOBAL {
    String cdm_data_type "Other";
    String Conventions "COARDS, CF-1.6, ACDD-1.3";
    String history 
"2024-05-01T01:21:08Z (local files)
2024-05-01T01:21:08Z https://polarwatch.noaa.gov/tabledap/polarwatch_datause_monthly.das";
    String infoUrl "https://polarwatch.noaa.gov/";
    String institution "NOAA/NESDIS/CoastWatch/PolarWatch";
    String keywords "data, dods, dods_req, dods_req_rd, dods_size, downloads, epoch, file, file_dl_req_rd, file_downloads_req, file_downloads_size, file_size, graph, graph_req, graph_req_rd, graph_size, identifier, images, images_req, images_req_rd, images_size, iso, json, json_req, json_req_rd, json_size, local, mat, mat_req, mat_req_rd, mat_size, metadata, metadata_req, metadata_req_rd, metadata_size, meteorology, nc_req, nc_req_rd, nc_size, other_req, other_req_rd, other_size, req, requests, requests_rd, size, source, text, text_req, text_req_rd, text_size, time, time_epoch, unique, unique_visitors, visitors";
    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 subsetVariables "dataset_id, time";
    String summary "Data usage extracted from the PolarWatch ERDDAP usage logs.";
    String testOutOfDate "now-115days";
    String time_coverage_end "2024-03-15T00:00:00Z";
    String time_coverage_start "2021-01-15T00:00:00Z";
    String title "PolarWatch ERDDAP Data Usage";
  }
}

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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