Make A Graph

Dataset Title:	Test Media Files
Institution:	NOAA SWFSC ERD (Dataset ID: testMediaFiles)
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

)

[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 {
  url {
    String ioos_category "Identifier";
    String long_name "URL";
  }
  name {
    String ioos_category "Identifier";
    String long_name "File Name";
  }
  lastModified {
    String ioos_category "Time";
    String long_name "Last Modified";
    String time_origin "01-JAN-1970 00:00:00";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  size {
    String ioos_category "Other";
    String long_name "Size";
    String units "bytes";
  }
  fileType {
    String ioos_category "Identifier";
    String long_name "File Type";
  }
 }
  NC_GLOBAL {
    String cdm_data_type "Other";
    String creator_email "erd.data@noaa.gov";
    String creator_name "Bob Simons";
    String creator_type "person";
    String history 
"erd.jpg is from NOAA NMFS SWFSC ERD (probably Steve Cummings).
The noaa20.gif is from NOAA.
The jplMURSST .png images were created by Bob Simons using ERDDAP.
The M1F1 audio files are from 
http://www-mmsp.ece.mcgill.ca/Documents/AudioFormats/
The small.* video files are from http://techslides.com/sample-webm-ogg-and-mp4-video-files-for-html5 
The aco_acoustic.20141119_002000.wav file with whale sounds is from Jim Potemra, Univ. of Hawaii.
The sample weather map is from 
https://www.lib.noaa.gov/collections/imgdocmaps/synoptic_weather_maps_northern_hemisphere.html
specifically
ftp://ftp.library.noaa.gov/swm.docs.lib/1902/19020101.pdf
Bob Simons used Acrobat \"File : Save As : png\" to convert the pdf into a png.
The sample fisheries video is from the old SWFSC website
https://swfsc.noaa.gov/textblock.aspx?id=9152
specifically
https://swfsc.noaa.gov/uploadedFiles/Multimedia_Gallery/Videos/Submersible_Surveys.mp4
Note that the last 5 seconds are indeed a still image with no sound, then it fades out.
2024-04-23T22:55:54Z (local files)
2024-04-23T22:55:54Z http://coastwatch.pfeg.noaa.gov/tabledap/testMediaFiles.das";
    String infoUrl "https://www.pfeg.noaa.gov/";
    String institution "NOAA SWFSC ERD";
    String keywords "audio, erd, files, image, video";
    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 subsetVariables "fileType";
    String summary 
"This dataset lets you test viewing various media files in ERDDAP. 
Use the /files/ option for this dataset and hover over the '?' icon for each 
file in order to view it.

WARNING: THESE WON'T ALL WORK! 
These viewers/players are built into browsers. 
Different browsers on different operating systems support different media file types.
Currently, no browser supports all media file types.
Some files work partially, e.g., the audio player often displays the wrong duration.";
    String title "Test Media Files";
  }
}

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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