The GRIB_INDEX_GET function returns the distinct key values contained in the index. The key must belong to the index.
See GRIB_GET_VALUES for a general example using the GRIB routines.
Result = GRIB_INDEX_GET(Gindex, Key [, /DOUBLE] [, /LONG] [, /STRING])
Returns the distinct key values contained in Gindex.
If Gindex is undefined, an error message is returned.
A GRIB index created from a file. The index must have been created with Key.
A case-sensitive string containing the key name to be searched.
Set this keyword if Key is explicitly defined as type DOUBLE or if the Key native type is DOUBLE.
Set this keyword if Key is explicitly defined as LONG if the Key native type is LONG.
Set this keyword if Key is explicitly defined as STRING or if the Key native type is STRING.