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 Look for Data
A quantity that is measured, computed, or derived (e.g. - temperature, precipitation amount, etc.)
The type of data values - e.g. grid (interpolated or computed gridpoints), platform observation (in-situ or remotely sensed measurements, etc.
The time distance between discrete observation measurements, model product valid times, etc. A time resolution of "Hourly to < Daily" means data that occurs more often than once per day but no more often than once per hour.
The entity that acquired or computed the data (e.g. - aircraft, land station, reanalysis model)
The horizontal distance between discrete gridpoints, stations, measurements, etc.
Topic and subtopic are high-level groupings of parameters (e.g. - Atmosphere (topic), Clouds (subtopic of Atmosphere) ).
The scientific project or experiment that acquired the data
Data that were acquired to support a project/experiment (e.g. - GATE) or that can be used as ingest for a project (e.g. - WRF)
The structure of the bitstream used to encapsulate the data values in a record or file (e.g - ASCII, netCDF, etc.)
The name of the location or region for which the data are valid
  Help on Narrowing Options

Please contact us at any time if you have questions or would like help with finding data for your research needs.

The process of narrowing your list of datasets is a "drill-down" process. Each choice you make gives you datasets that match that choice, but only if they have matched all of your previous choices. This allows you to narrow an initially large list of datasets down to a manageable list of datasets that you can investigate further for your research needs. You can see all of the choices you have made in the orange bar at the top of your list. You can revert the list back to any of your previous choices by clicking the links in the orange bar.

The following explains the meanings of the narrowing options in the "Look for Data" menu:

    • Variable
      The variable refers to the quantity that is measured (e.g. - temperature, precipitation amount, etc.)

    • Time Resolution
      The time resolution refers to how often the data occur in the dataset. A time resolution of "Hourly to < Daily" means data that occurs no more often than once per hour and at least more than once per day.

    • Data Type
      The data type refers to how the data are organized and presented. The data types we present are described as:
        • Geospatial Fix:
        • Grid: Data are arranged in a regularly-spaced array of gridpoints (e.g. - output from a computer model, station data that have been interpolated to a grid, etc.)
        • Location: Catalog information about observing platforms (ID, latitude, longitude, elevation, etc.)
        • Log Entry:
        • Platform Observation: Generally, in-situ observations made by some type of platform (e.g. - observations from a land station or ship, etc.), but may also include observations derived from a remote sensor (e.g. - a vertical profile of temperature at a specific location derived from satellite data)
        • Radar: Reflectivity scans from a radar
        • Satellite: Radiances, either as an image or orbital scan lines, from a satellite

    • Platform
      The platform refers to the type of system from which the data were acquired (e.g. - land station, aircraft, ship, etc.) or produced (e.g. - computer model).

    • Project/Experiment
      The project/experiment refers to the program or campaign during which the data were acquired (e.g. - GARP Atlantic Tropical Experiment, NCEP/NCAR Reanalysis, etc.)

    • Progress
      Progress refers to the status of the dataset. A progress of "Complete" means that the dataset is in its final form and does not receive regular updates. A progress of "Continually Updated" means that the dataset receives regular updates that extend the ending date/time of the dataset to keep it current.

    • Data Format
      The data format refers to how the data are laid out within a data file. This information is needed so you will know how to decode the data, and you can use this option to find datasets that have a format which is recognizable by data tools that you use.

    • Free Text
      The free text option allows you to enter any words of your choice.

The Research Data Archive is managed by the Data Support Section of the Computational and Information Systems Laboratory at the National Center for Atmospheric Research in Boulder, Colorado. NCAR is sponsored by the National Science Foundation.

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