Data Services : ERDDAP

Environmental Research Division’s Data Access Program (ERDDAP)

Developed by: NOAA Environmental Research Division (ERD), ERDDAP info


Supports a large variety of output formats for both gridded and point-based data sets. Useful as both a data server and a data viewer.

Suggested use:

  • Subset and download data in a large variety of output formats.
  • Map and plot either gridded or point data sets. Tip: You may prefer gridded plots using Live Access Server (LAS) and in situ plots using DChart.


  • RESTful (URL-based) data access for both gridded and point data sets.
  • Highly customizable data access and data browse capabilities in one interface.
  • Metadata in three flavors: FGDC, ISO, and NetCDF attributes. Tip: View PacIOOS metadata at


  • Web Map Service (WMS) only supports the geographic “latlong” projection (EPSG:4326). Tip:TDS provides WMS with greater projection support and other enhancements.
  • Data sets that include variables with and without a depth component must be split into separate catalog entries.
  • Maps and plots are not interactive: you cannot drag/pan them, click to query data, or double-click to zoom.
  • Coastlines are coarse and no basemaps are provided, such as satellite imagery, Google-like maps, or other geographic aids.

Data offerings:

  • Includes real-time in situ observations that are point-based (water quality buoys, nearshore sensors), though we have not yet included the tide gauges.
  • Does not handle radials (high frequency radios) or trajectories (autonomous underwater vehicles).
  • Provides most of our forecast models, satellite data, and other gridded data like bathymetry, though it cannot handle irregular (curvilinear) grids like our native ROMS ocean model.
  • Links to a few external data sets not offered in our other servers, including CTD data from the PacX wave gliders.


Data types:

  • grids
  • points


  • RESTful (URL-based) data access
  • gridded data only:
    • Web Map Service (WMS) (EPSG:4326 latlong projection only)

Output formats:

  • NetCDF
  • DODS binary (OPeNDAP)
  • PNG
  • KML
  • PDF
  • GeoTIFF
  • XML
  • ASCII text: comma-separated values (CSV) or tab-separated values (TSV)
  • HTML table
  • MATLAB binary
  • Ocean Data View (ODV)
  • others…


  • ISO 19115-2: Geographic Information − Metadata
  • FGDC: U.S. Federal Geographic Data Committee (FGDC) Content Standard for Digital Geospatial Metadata (CSDGM)
  • CF: NetCDF Climate and Forecast Metadata Convention
  • NetCDF Attribute Convention for Dataset Discovery


  • makes maps and time series plots
  • generates vector maps (wind, currents) from u (eastward) and v (northward) velocity components

Additional features:

  • RSS feeds and e-mail subscriptions for update notifications.
  • Embed maps and plots into your own website.
  • Use ERDDAP’s slide sorter to produce a website from multiple maps, plots, or other content.
  • Full text search and advanced search capabilities for finding datasets of interest.
Data Interoperability

Plug-and-play with PacIOOS data in your chosen software or programming language using standardized web services protocols like OPeNDAP, Web Map Service (WMS), Sensor Observation Service (SOS), NetCDF Subset Service (NCSS), and other open access methods. Please contact us at if you have any questions!