Global Data Assimilation System (GDAS)
The Global Data Assimilation System (GDAS) is the system used by the Global Forecast System (GFS) model to place observations into a gridded model space for the purpose of starting, or initializing, weather forecasts with observed data. GDAS adds the following types of observations to a gridded, 3-D, model space: surface observations, balloon data, wind profiler data, aircraft reports, buoy observations, radar observations, and satellite observations. GDAS data are available as both input observations to GDAS and gridded output fields from GDAS. Gridded GDAS output data can be used to start the GFS model. Due to the diverse nature of the assimilated data types, input data are available in a variety of data formats, primarily Binary Universal Form for the Representation of meteorological data (BUFR) and Institute of Electrical and Electronics Engineers (IEEE) binary. The GDAS output is World Meteorological Organization (WMO) Gridded Binary (GRIB).
Cite this dataset when used as a source.
- NCEI DSI 6172
- gov.noaa.ncdc:C00379
| Download Data |
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| Order Data |
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| Distribution Formats |
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| Ordering Instructions |
Contact NCEI for other distribution options and instructions. |
| Distributor |
NOAA National Centers for Environmental Information
ncei.info@noaa.gov
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| Dataset Point of Contact |
Customer Engagement Branch
NOAA National Centers for Environmental Information
1-828-271-4800
ncei.orders@noaa.gov
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| Dataset Point of Contact |
DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
nomads.ncdc@noaa.gov
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| Coverage Description |
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| Time Period |
2001-01-01 to Present |
| Spatial Bounding Box Coordinates |
West: -180.0
East: 180.0
South: -90.0
North: 90.0
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| Spatial Coverage Map |
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| Publication Dates |
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| Data Presentation Form |
Digital model - multi-dimensional digital representation of a feature, process, etc.
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| Dataset Progress Status |
Ongoing - data is continually being updated |
| Data Update Frequency |
Daily |
| Purpose |
To provide initialization state grids for starting the Global Forecast System (GFS) model. |
| Cited Authors |
- DOC/NOAA/NWS/NCEP/EMC > Environmental Modeling Center, National Centers for Environmental Prediction, National Weather Service, NOAA, U.S. Department of Commerce
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| Originators |
- DOC/NOAA/NWS/NCEP/EMC > Environmental Modeling Center, National Centers for Environmental Prediction, National Weather Service, NOAA, U.S. Department of Commerce
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| Publishers |
- NOAA National Centers for Environmental Information
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| Theme keywords |
Global Change Master Directory (GCMD) Science Keywords
- Earth Science > Atmosphere > Altitude > Geopotential Height
- Earth Science > Atmosphere > Altitude > Planetary Boundary Layer Height
- Earth Science > Atmosphere > Altitude > Tropopause
- Earth Science > Atmosphere > Atmospheric Pressure > Atmospheric Pressure Measurements
- Earth Science > Atmosphere > Atmospheric Pressure > Pressure Thickness
- Earth Science > Atmosphere > Atmospheric Pressure > Sea Level Pressure
- Earth Science > Atmosphere > Atmospheric Pressure > Surface Pressure
- Earth Science > Atmosphere > Atmospheric Pressure > Albedo
- Earth Science > Atmosphere > Atmospheric Pressure > Land Cover
- Earth Science > Atmosphere > Atmospheric Pressure > Soil Moisture/Water Content
- Earth Science > Atmosphere > Atmospheric Pressure > Soil Temperature
- Earth Science > Atmosphere > Atmospheric Pressure > Sea Surface Temperature
- Earth Science > Atmosphere > Atmospheric Radiation > Albedo
- Earth Science > Atmosphere > Atmospheric Radiation > Incoming Solar Radiation
- Earth Science > Atmosphere > Atmospheric Radiation > Longwave Radiation
- Earth Science > Atmosphere > Atmospheric Radiation > Radiative Flux
- Earth Science > Atmosphere > Atmospheric Radiation > Shortwave Radiation
- Earth Science > Atmosphere > Atmospheric Radiation > Solar Radiation
- Earth Science > Atmosphere > Atmospheric Temperature > Surface Temperature > Air Temperature
- Earth Science > Atmosphere > Atmospheric Temperature > Atmospheric Stability
- Earth Science > Atmosphere > Atmospheric Temperature > Boundary Layer Temperature
- Earth Science > Atmosphere > Atmospheric Temperature > Dew Point Temperature
- Earth Science > Atmosphere > Atmospheric Temperature > Upper Air Temperature > Vertical Profiles > Inversion Height
- Earth Science > Atmosphere > Atmospheric Temperature > Surface Temperature > Potential Temperature
- Earth Science > Atmosphere > Atmospheric Temperature > Surface Temperature > Skin Temperature
- Earth Science > Atmosphere > Atmospheric Temperature > Surface Temperature
- Earth Science > Atmosphere > Atmospheric Temperature > Upper Air Temperature
- Earth Science > Atmosphere > Atmospheric Water Vapor > Water Vapor Indicators > Dew Point Temperature
- Earth Science > Atmosphere > Atmospheric Water Vapor > Water Vapor Processes > Evaporation
- Earth Science > Atmosphere > Atmospheric Water Vapor > Water Vapor Indicators > Humidity
- Earth Science > Atmosphere > Atmospheric Water Vapor > Water Vapor Indicators > Total Precipitable Water
- Earth Science > Atmosphere > Atmospheric Water Vapor > Water Vapor
- Earth Science > Atmosphere > Atmospheric Water Vapor > Water Vapor Profiles
- Earth Science > Atmosphere > Atmospheric Winds > Boundary Layer Winds
- Earth Science > Atmosphere > Atmospheric Winds > Wind Dynamics > Convection
- Earth Science > Atmosphere > Atmospheric Winds > Upper Level Winds > Flight Level Winds
- Earth Science > Atmosphere > Atmospheric Winds > Surface Winds
- Earth Science > Atmosphere > Atmospheric Winds > Upper Level Winds
- Earth Science > Atmosphere > Atmospheric Winds > Wind Dynamics > Vertical Wind Velocity/Speed
- Earth Science > Atmosphere > Atmospheric Winds > Wind Dynamics > Vorticity
- Earth Science > Atmosphere > Atmospheric Winds > Wind Profiles
- Earth Science > Atmosphere > Atmospheric Winds > Wind Dynamics > Wind Shear
- Earth Science > Atmosphere > Clouds > Tropospheric/High-Level Clouds (observed/Analyzed)
- Earth Science > Atmosphere > Clouds > Tropospheric/Low Level Clouds (observed/Analyzed)
- Earth Science > Atmosphere > Clouds > Tropospheric/Mid-Level Clouds (observed/Analyzed)
- Earth Science > Atmosphere > Precipitation > Liquid Precipitation > Rain > Freezing Rain
- Earth Science > Atmosphere > Precipitation > Precipitation Amount
- Earth Science > Atmosphere > Precipitation > Precipitation Rate
- Earth Science > Atmosphere > Precipitation > Liquid Precipitation > Rain
- Earth Science > Atmosphere > Precipitation > Solid Precipitation > Ice Pellets > Sleet
- Earth Science > Atmosphere > Precipitation > Solid Precipitation > Snow
- Earth Science > Terrestrial Hydrosphere > Snow/Ice > Albedo
- Earth Science > Terrestrial Hydrosphere > Snow/Ice > Snow Cover
- Earth Science > Terrestrial Hydrosphere > Snow/Ice > Snow Depth
- Earth Science > Oceans > Sea Ice > Sea Ice Concentration
- Earth Science > Land Surface > Surface Radiative Properties > Albedo
- Earth Science > Land Surface > Land Use/Land Cover > Land Use/Land Cover Classification > Vegetation Index
- Earth Science > Land Surface > Soils > Soil Moisture/Water Content
- Earth Science > Land Surface > Soils > Soil Temperature
- Earth Science > Oceans > Ocean Temperature > Sea Surface Temperature
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| Data Center keywords |
Global Change Master Directory (GCMD) Data Center Keywords
- DOC/NOAA/NESDIS/NCDC > National Climatic Data Center, NESDIS, NOAA, U.S. Department of Commerce
- DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
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| Place keywords |
Global Change Master Directory (GCMD) Location Keywords- Geographic Region > Global
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| Project keywords |
Global Change Master Directory (GCMD) Project Keywords- NOMADS > The NOAA Operational Model Archive and Distribution System
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| Stratum keywords |
Global Change Master Directory (GCMD) Location Keywords
- Vertical Location > Boundary Layer
- Vertical Location > Land Surface
- Vertical Location > Sea Surface
- Vertical Location > Troposphere
- Vertical Location > Stratosphere
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| Use Constraints |
No constraint information available |
| Fees |
- In most cases, electronic downloads of the data are free. However, fees may apply for custom orders, data certifications, copies of analog materials, and data distribution on physical media.
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| Lineage information for: repository |
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| Processing Steps |
- 2015-04-22T00:00:00 - NOAA created the National Centers for Environmental Information (NCEI) by merging NOAA's National Climatic Data Center (NCDC), National Geophysical Data Center (NGDC), and National Oceanographic Data Center (NODC), including the National Coastal Data Development Center (NCDDC), per the Consolidated and Further Continuing Appropriations Act, 2015, Public Law 113-235. NCEI launched publicly on April 22, 2015.
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Last Modified: 2023-06-23
For questions about the information on this page, please email:
ncei.info@noaa.gov
