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For data in GRIB1 format (as is the case with ERA-Interim data) the earth model is a sphere with radius = 6367.47 km, as defined in the WMO GRIB Edition 1 specifications, Table 7, GDS Octet 17
For data in NetCDF format (i.e. converted from the native GRIB format to NetCDF), the earth model is inherited from the GRIB data.
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In-situ data, provided by WMO WIS
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| Dataset name | Observation type | Measurement |
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| SYNOP | Land station | Surface Pressure, Temperature, wind, humidity | | METAR | Land station | Surface Pressure, Temperature, wind,humidity | | DRIBU/DRIBU-BATHY/DRIBU-TESAC/BUFR Drifting Buoy | Drifting buoys | 10m-wind, Surface Pressure | | BUFR Moored Buoy | Moored buoys | 10m-wind, Surface Pressure | | SYNOP SHIP | ship station | Surface Pressure, Temperature, wind, humidity | | Land/ship PILOT | Radiosondes | wind profiles | | American Wind Profiler | Radar | wind profiles | | European Wind Profiler | Radar | wind profiles | | Japanese Wind Profiler | Radar | wind profiles | | TEMP SHIP | Radiosondes | Temperature, wind, humidity profiles | | DROP Sonde | Aircraft-sondes | Temperature, wind profiles | | Land/Mobile TEMP | Radiosondes | Temperature, wind, humidity profiles | | AIREP | Aircraft data | Temperature, wind profiles | | AMDAR | Aircraft data | Temperature, wind profiles | | ACARS | Aircraft data | Temperature, wind profiles, humidity | | WIGOS AMDAR | Aircraft data | Temperature, wind profiles | | Ground based radar | Radar precipitation composites | Rain rates |
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