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! (C) Copyright 2005- ECMWF.
!
! This software is licensed under the terms of the Apache Licence Version 2.0
! which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
!
! In applying this licence, ECMWF does not waive the privileges and immunities granted to it by
! virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
!
!
! Description: how to get values using keys from GRIB messages
!
!
program grib_get_keys
use eccodes
implicit none
integer :: ifile
integer :: iret
integer :: igrib
real :: latitudeOfFirstPointInDegrees
real :: longitudeOfFirstPointInDegrees
real :: latitudeOfLastPointInDegrees
real :: longitudeOfLastPointInDegrees
integer :: numberOfPointsAlongAParallel
integer :: numberOfPointsAlongAMeridian
real, dimension(:), allocatable :: values
integer :: numberOfValues
real :: average,min_val, max_val
integer :: is_missing
character(len=10) :: open_mode='r'
call codes_open_file(ifile, &
'../../data/reduced_latlon_surface.grib1', open_mode)
! Loop on all the messages in a file.
! A new GRIB message is loaded from file
! igrib is the grib id to be used in subsequent calls
call codes_grib_new_from_file(ifile,igrib, iret)
LOOP: DO WHILE (iret /= CODES_END_OF_FILE)
! Check if the value of the key is MISSING
is_missing=0;
call codes_is_missing(igrib,'Ni',is_missing);
if ( is_missing /= 1 ) then
! Key value is not missing so get as an integer
call codes_get(igrib,'Ni',numberOfPointsAlongAParallel)
write(*,*) 'numberOfPointsAlongAParallel=', &
numberOfPointsAlongAParallel
else
write(*,*) 'numberOfPointsAlongAParallel is missing'
endif
! Get as an integer
call codes_get(igrib,'Nj',numberOfPointsAlongAMeridian)
write(*,*) 'numberOfPointsAlongAMeridian=', &
numberOfPointsAlongAMeridian
! Get as a real
call codes_get(igrib, 'latitudeOfFirstGridPointInDegrees', &
latitudeOfFirstPointInDegrees)
write(*,*) 'latitudeOfFirstGridPointInDegrees=', &
latitudeOfFirstPointInDegrees
! Get as a real
call codes_get(igrib, 'longitudeOfFirstGridPointInDegrees', &
longitudeOfFirstPointInDegrees)
write(*,*) 'longitudeOfFirstGridPointInDegrees=', &
longitudeOfFirstPointInDegrees
! Get as a real
call codes_get(igrib, 'latitudeOfLastGridPointInDegrees', &
latitudeOfLastPointInDegrees)
write(*,*) 'latitudeOfLastGridPointInDegrees=', &
latitudeOfLastPointInDegrees
! Get as a real
call codes_get(igrib, 'longitudeOfLastGridPointInDegrees', &
longitudeOfLastPointInDegrees)
write(*,*) 'longitudeOfLastGridPointInDegrees=', &
longitudeOfLastPointInDegrees
! Get the size of the values array
call codes_get_size(igrib,'values',numberOfValues)
write(*,*) 'numberOfValues=',numberOfValues
allocate(values(numberOfValues), stat=iret)
! Get data values
call codes_get(igrib,'values',values)
call codes_get(igrib,'min',min_val) ! can also be obtained through minval(values)
call codes_get(igrib,'max',max_val) ! can also be obtained through maxval(values)
call codes_get(igrib,'average',average) ! can also be obtained through maxval(values)
deallocate(values)
write(*,*)'There are ',numberOfValues, &
' average is ',average, &
' min is ', min_val, &
' max is ', max_val
call codes_release(igrib)
call codes_grib_new_from_file(ifile,igrib, iret)
end do LOOP
call codes_close_file(ifile)
end program grib_get_keys
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