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wgrib2: limitations

Limitations on 32-bit computer 2. The maximum grib file is limited to 2GB unless the file is read sequentially.

i.e., cat grib_file | wgrib2 - (rest of options)

  • large grib messages and grids will use buffer space and exhaust physical memory.
  • grib message is limited to 2GB (fixed v2.0.4)
  • Any buffer greater than 4GB is a problem.
  • The maximum grib message is limited to 2GB to 4GB (depending on routine)
  • The maximum number of grid points varies by routine from to 2G to 4G (grib2 standard=4G).

The amount of addressable memory will be a limitation.

  • The maximum bit precision of a complex-packed file is 25. Limitations on 64-bit computer

  • The maximum number of grid points varies by routine from to 2G to 4G (grib2 standard=4G).

Low priority to get the routines to 4G.

  • -new_grid is limited to 2G grid points by the fortran library.
  • grib message is limited to 2GB (fixed v2.0.4)

  • The maximum bit precision of a complex-packed file is 25. Limitations on computer with 64-bit pointers and 32-bit long integers

  • Similar to 32-bit limitations. Supported Unpacking Schemes

  • simple

  • simple with log preprocessing

  • complex with bitmaps or special values
  • jpeg2000
  • png
  • ieee
  • RLE

  • CCSDS/AEC Supported Packing Schemes

  • simple

  • complex with bitmaps or special values

  • jpeg2000
  • ieee

  • CCSDS/AEC Grid Support Levels: geolocation

  • nothing

  • diagnostic inforamtion

  • latitude/longitude of the grid points are calculated (spherical earth)

  • latitude/longitude of the grid points are calculated (aspherical earth) Grid Support Levels: ipolates (-new_grid)

  • nothing

  • can be an input grid for -new_grid

  • can be an input or output grid for -new_grid Grid Support Levels: -small_grib

  • nothing

  • can be an input grid for -small_grib Grid support:

  • lat-lon: full support

  • Lambert conformal: full support
  • Polar stereographic: full support
  • Mercator: full support
  • Gaussian: all but -small_grib
  • thinned lat-lon grids: only geolocation
  • rotated lat-lon grids: only geolocation
  • space view perspective: only geolocation
  • Albers equal area: only geolocation
  • Lambert Azimuthal equal area: only geolocation
  • staggering all above except for Gaussian: only geolocation
  • irregular grid: only geolocation

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Description: limitations

Docs derived from https://www.cpc.ncep.noaa.gov/products/wesley/wgrib2/limitations.html