This is what the tool grib_get_data provides: A list of latitude-longitude-value triplets for a GRIB message. Note that you can also use the API to access this functionality: See examples.
This is also called a geo iterator (as opposed to the keys iterator)

This iterator is only for grid-point data: For example it does not make sense for spherical harmonic coefficients.

Also it is not implemented for all grid types. At the time of writing only the following are supported:

• Regular latitude/longitude
• Rotated latitude/longitude
• Regular Gaussian
• Reduced latitude/longitude
• Reduced Gaussian
• Lambert conformal
• Lambert azimuthal equal area
• Polar stereographic
• Mercator
• Space view

If the iterator is not implemented for an input field, grib_get_data prints just the data values (without the latitude/longitudes).

The full list of grid types are listed here: GRIB edition 1 and GRIB edition 2.

There are also some useful keys which use this iterator:

• latitudes: An array with all the latitudes of the grid points
• longitudes: An array with all the longitudes of the grid points
• latLonValues: An array with all the latitudes/longitudes/values for each point of the grid
  e.g. (lat1,lon1,value1, lat2,lon2,value2,..., latN,lonN,valueN)
  The length of this array is 3 times the length of the previous two.

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