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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 use codes_grib_find_nearest and codes_get_element
!
!
!
program find
use eccodes
implicit none
integer :: npoints
integer :: infile
integer :: igrib, ios, i
real(8), dimension(:), allocatable :: lats, lons
real(8), dimension(:), allocatable :: nearest_lats, nearest_lons
real(8), dimension(:), allocatable :: distances, values, lsm_values
integer(kind=kindOfInt), dimension(:), allocatable :: indexes
! initialization
open (unit=1, file="../../data/list_points", form="formatted", action="read")
read (unit=1, fmt=*) npoints
allocate (lats(npoints))
allocate (lons(npoints))
allocate (nearest_lats(npoints))
allocate (nearest_lons(npoints))
allocate (distances(npoints))
allocate (lsm_values(npoints))
allocate (values(npoints))
allocate (indexes(npoints))
do i = 1, npoints
read (unit=1, fmt=*, iostat=ios) lats(i), lons(i)
if (ios /= 0) then
npoints = i - 1
exit
end if
end do
close (unit=1)
call codes_open_file(infile, &
'../../data/reduced_gaussian_lsm.grib1', 'r')
! 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(infile, igrib)
call codes_grib_find_nearest(igrib, .true., lats, lons, nearest_lats, nearest_lons, lsm_values, distances, indexes)
call codes_release(igrib)
call codes_close_file(infile)
! will apply it to another GRIB
call codes_open_file(infile, &
'../../data/reduced_gaussian_pressure_level.grib1', 'r')
call codes_grib_new_from_file(infile, igrib)
call codes_get_element(igrib, "values", indexes, values)
call codes_release(igrib)
call codes_close_file(infile)
do i = 1, npoints
print *, lats(i), lons(i), nearest_lats(i), nearest_lons(i), distances(i), lsm_values(i), values(i)
end do
deallocate (lats)
deallocate (lons)
deallocate (nearest_lats)
deallocate (nearest_lons)
deallocate (distances)
deallocate (lsm_values)
deallocate (values)
deallocate (indexes)
end program find
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