NOAA The NOAA GEO-IDE UAF ERDDAP
Easier access to all of NOAA's data
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The NOAA GEO-IDE UAF ERDDAP

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

 


Converters
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
  • Keywords - Convert a CF Standard Name to/from a GCMD Science Keyword
  • Time - Convert a Numeric Time to/from a String Time
  • Units - Convert UDUNITS to/from Unified Code for Units of Measure (UCUM)
  • Variable Names - Convert a Common Oceanic/Atmospheric Variable Name to/from a Full Name

Metadata
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). documentation


 
ERDDAP, Version 1.72
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