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# get_pv.f90

How to get the list of levels.

    00001 ! Copyright 2005-2018 ECMWF
    00002 ! This software is licensed under the terms of the Apache Licence Version 2.0
    00003 ! which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
    00004 !
    00005 ! In applying this licence, ECMWF does not waive the privileges and immunities granted to it by
    00006 ! virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
    00007 !
    00008 !
    00009 !  Description: how to get PV values.
    00010 !
    00011 !
    00012 !  Author: Anne Fouilloux
    00013 !
    00014 !
    00015 program get_pv
    00016   use grib_api
    00017   implicit none
    00018   integer                         :: infile
    00019   integer                         :: igrib
    00020   integer                         :: PVPresent, nb_pv
    00021   real, dimension(:), allocatable :: pv
    00022
    00023
    00024   call grib_open_file(infile, &
    00025        '../../data/reduced_gaussian_model_level.grib1','r')
    00026
    00027   !     a new grib message is loaded from file
    00028   !     igrib is the grib id to be used in subsequent calls
    00029   call grib_new_from_file(infile,igrib)
    00030
    00031   !     set PVPresent as an integer
    00032   call grib_get(igrib,'PVPresent',PVPresent)
    00033   print*, "PVPresent = ", PVPresent
    00034   if (PVPresent == 1) then
    00035      call grib_get_size(igrib,'pv',nb_pv)
    00036      print*, "There are ", nb_pv, " PV values"
    00037      allocate(pv(nb_pv))
    00038      call grib_get(igrib,'pv',pv)
    00039      print*, "pv = ", pv
    00040      deallocate(pv)
    00041   else
    00042      print*, "There is no PV values in your GRIB message!"
    00043   end if
    00044   call grib_release(igrib)
    00045
    00046   call grib_close_file(infile)
    00047
    00048 end program get_pv