Easier access to scientific data
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The goal of this web site is to give you easier access to all of NOAA's data. ERDDAP is a data server that gives you a simple, consistent way to download subsets of gridded and tabular scientific datasets in common file formats and make graphs and maps.

NOAA (the National Oceanic and Atmospheric Administration) is the U.S. federal agency with a mission to understand and predict changes in Earth's environment and conserve and manage coastal and marine resources to meet our Nation's economic, social, and environmental needs.

GEO-IDE (the NOAA Global Earth Observation - Integrated Data Environment initiative) is a set of guidelines and best practices that establish a framework for improving the interoperability of NOAA's environmental information management resources. GEO-IDE is a project of the NOAA Data Management Integration Team (DMIT).

UAF (the Unified Access Framework) is a NOAA-wide effort to develop a gridded dataset integration capability. The capability is being developing using several de facto standards: netCDF, which provides the abstract data model, software libraries and a persistent binary format; the Climate and Forecast (CF) metadata conventions; the OPeNDAP protocol for web transport of data subsets; THREDDS XML catalogs which provide a distributed topology connecting data suppliers; and an OGC compatibility layer that provides access to the grids through WMS and WCS.

The initial focus has been to develop a NOAA-wide UAF THREDDS catalog of CF-compliant datasets (e.g. model outputs, satellite products, High Frequency radar observations, etc.) and to connect the catalog to other data servers (e.g., LAS and ERDDAP (this web site!)) and several popular client tools (e.g. MatLab, Google Earth) to enable direct access and use of the datasets.

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 ERDDAP installation makes all of the datasets in the NOAA-wide UAF THREDDS catalog and many additional datasets available via ERDDAP. The added benefits of using ERDDAP are:

  • More Search Options - ERDDAP gives you many ways to search for interesting datasets (see the options at right), instead of just a tree (hierarchical) list of the datasets.
  • More File Formats - ERDDAP gives you the ability to download subsets of the datasets in many common file formats (for example, .html table, ESRI .asc, Google Earth .kml, .mat, .nc, OPeNDAP .asc and .dods, .csv, .tsv, .json, and .xhtml) instead of just the OPeNDAP ASCII and binary formats.
  • A Consistent Time Format - In ERDDAP, time when formatted as a number is always in "seconds since 1970-01-01T00:00:00Z" (which is UDUNITS-compatible) and,
    when formatted as a string, time is formatted according to the ISO 8601:2004 "extended" format standard
    (YYYY-MM-DDThh:mm:ssZ, for example, "1985-01-02T00:00:00Z").
    Also, to avoid time zone and daylight savings time confusion, time values are always converted to the UTC (GMT/Zulu) time zone.
    This makes it easy to specify time constraints in requests without having to worry about the time format (a nightmarish realm of possible formats and time zones).
    And this makes the results from different data sources easy to compare.
  • Custom Graphs and Maps - ERDDAP gives you the ability to make customized graphs and maps. (See the Make A Graph option for each dataset.)
To see ERDDAP and UAF in action, watch the first half of this YouTube video. (5 minutes)
In it, a scientist uses ERDDAP to download ocean currents forecast data from NOAA's NODC/NCDDC to model a toxic spill in the ocean using NOAA's GNOME software (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.


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.
Data Provider Form The Data Provider Form is for people who have data and want it to be served by this ERDDAP. It collects basic information about the dataset and emails it to this ERDDAP's administrator.

ERDDAP, Version 2.23
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