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Erddap est un produit développé par : NOAA ERD    

Plate-forme de gestion des données environnementales
OSU Pytheas

ERDDAP is a data server that gives you a simple, consistent way to download subsets of scientific datasets in common file formats and make graphs and maps. This particular ERDDAP installation has oceanographic data (for example, data from satellites and buoys).
ERDDAP est un serveur de donnees qui fournit un moyen simple et coherent de d'acceder a des ensembles de donnees scientifiques dans des formats de fichiers standards et qui permet de visualiser simplement les donnees avec des graphiques et des cartes.

Easier Access to Scientific Data

Our focus is on making it easier for you to get scientific data.

Different scientific communities have developed different types of data servers.

For example, OPeNDAP, WCS, SOS, OBIS, and countless custom web pages with forms. Each is great on its own. But without ERDDAP, it is difficult to get data from different types of servers:

  • Different data servers make you format your data request in different ways.
  • Different data servers return data in different formats, usually not the common file format that you want.
  • Different datasets use different formats for time data, so the results are hard to compare.

ERDDAP unifies the different types of data servers so you have a consistent way to get the data you want, in the format you want.

  • ERDDAP acts as a middleman between you and various remote data servers. When you request data from ERDDAP, ERDDAP reformats the request into the format required by the remote server, sends the request to the remote server, gets the data, reformats the data into the format that you requested, and sends the data to you. You no longer have to go to different data servers to get data from different datasets.
  • ERDDAP offers an easy-to-use, consistent way to request data: via the OPeNDAP standard.
    Many datasets can also be accessed via ERDDAP's Web Map Service (WMS).
  • ERDDAP returns data in the common file format of your choice. ERDDAP offers all data as .html table, ESRI .asc and .csv, Google Earth .kml, OPeNDAP binary, .mat, .nc, ODV .txt, .csv, .tsv, .json, and .xhtml. So you no longer have to waste time and effort reformatting data.
  • ERDDAP can also return a .png or .pdf image with a customized graph or map.
  • ERDDAP standardizes the dates+times in the results. Data from other data servers is hard to compare because the dates+times often are expressed in different formats (for example, "Jan 2, 2018", 02-JAN-2018, 1/2/18, 2/1/18, 2018-01-02, "days since Jan 1, 1900"). For string times, ERDDAP always uses the ISO 8601:2004(E) standard format, for example, 2018-01-02T00:00:00Z. For numeric times, ERDDAP always uses "seconds since 1970-01-01T00:00:00Z". ERDDAP always uses the Zulu (UTC, GMT) time zone to remove the difficulties of working with different time zones and standard time versus daylight saving time. ERDDAP has a service to convert a string time to/from a numeric time.
  • ERDDAP has web pages (for humans with browsers) and RESTful web services (for computer programs). You can bypass ERDDAP's web pages and use ERDDAP's RESTful web services (for example, for searching for datasets, for downloading data, for making maps) directly from any computer program (for example, Matlab, R, or a program that you write) and even from web pages (via HTML image tags or JavaScript). You can also build other useful and interesting things on top of ERDDAP's web services — see the Awesome ERDDAP (external link) list of Awesome ERDDAP-related projects.

For a quick introduction to ERDDAP, watch the first half of this YouTube video (external link). (5 minutes) In it, a scientist downloads ocean currents forecast data from ERDDAP to model a toxic spill in the ocean using NOAA's GNOME software (external link) (in 5 minutes!). Thanks to Rich Signell. (One tiny error in the video: when searching for datasets, don't use AND between search terms. It is implicit.)

Find out more about ERDDAP.

Data Providers: You can set up your own ERDDAP server and serve your own data. ERDDAP is free and open source. It uses Apache-like licenses, so you can do anything you want with it. ERDDAP's appearance is customizable, so your ERDDAP will reflect your institution, not NOAA. The small effort to set up ERDDAP brings many benefits. If you already have a web service for distributing your data, you can set up ERDDAP to access your data via the existing service or via the source files or database. Then, people will have another way to access your data and will be able to download the data in additional file formats or as graphs or maps. ERDDAP has been installed by over 90 organizations in at least 14 countries. NOAA's Data Access Procedural Directive (external link) includes ERDDAP in its list of recommended data servers for use by groups within NOAA.


Start Using ERDDAP:
    Search for Interesting Datasets


In addition to serving data, ERDDAP has some handy converters:

Acronyms Convert a Common Oceanic/Atmospheric Acronym to/from a Full Name
FIPS County Codes Convert a FIPS County Code to/from a County Name
Interpolate Interpolate Values From Gridded Dataset Values
Keywords Convert a CF Standard Name to/from a GCMD Science Keyword
Time Convert a String Time to/from a Numeric Time
Units Convert UDUNITS to/from Unified Code for Units of Measure (UCUM)
URLs Convert Out-of-Date URLs into Up-to-Date URLs
Variable Names Convert a Common Oceanic/Atmospheric Variable Name to/from a Full Name

ERDDAP has an
FGDC Web Accessible Folder (WAF) with FGDC‑STD‑001‑1998 (external link) metadata files and an
ISO 19115 Web Accessible Folder (WAF) with ISO 19115‑2/19139 (external link) metadata files for all of the geospatial datasets in this ERDDAP.

RESTful Web Services
You can bypass ERDDAP's web pages and use ERDDAP's RESTful web services (for example, for searching for datasets, for downloading data, for making maps) directly from any computer program (for example, Matlab, R, or a program that you write) and even from web pages (via HTML image tags or JavaScript). RESTful Web Services documentation

Other Features

Status The Status web page is a quick way to check the current status/health of this ERDDAP, including a list of datasets which failed to load.
Out-Of-Date Datasets The Out-Of-Date Datasets web page displays a list of near-real-time datasets, ranked by how out-of-date they are.
Subscriptions ERDDAP has an email/URL subscription system so that you can be notified immediately whenever a dataset changes (for example, whenever new data is added to a near-real-time dataset).
Slide Sorter Anyone can use ERDDAP's 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.

ERDDAP, Version 2.23
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