1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
|
! (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 create a new GRIB message from a sample.
!
!
program sample
use eccodes
implicit none
integer :: err
integer :: outfile, datafile
integer :: igribsample,igribclone,igribdata, size1
integer :: date1, startStep, endStep, table2Version, indicatorOfParameter
integer :: decimalPrecision
character(len=10) stepType
real(kind=8), dimension(:), allocatable :: v1,v2,v
date1 = 20080104
startStep = 0
endStep = 12
stepType = 'accum'
table2Version = 2
indicatorOfParameter = 61
decimalPrecision = 2
! A new grib message is loaded from an existing sample.
! Samples are searched in a default sample path (use codes_info
! to see where that is). The default sample path can be changed by
! setting the environment variable ECCODES_SAMPLES_PATH
call codes_grib_new_from_samples(igribsample, "regular_latlon_surface.grib1")
call codes_open_file(outfile, 'f_out.samples.grib1','w')
call codes_open_file(datafile,'../../data/tp_ecmwf.grib','r')
call codes_grib_new_from_file(datafile,igribdata,err)
call codes_get_size(igribdata,'values',size1)
allocate(v(size1))
allocate(v1(size1))
allocate(v2(size1))
call codes_get(igribdata,'values',v)
v=v*1000.0 ! different units for the output grib
v1=v
do while (err/=CODES_END_OF_FILE)
call codes_clone(igribsample,igribclone) ! clone sample before modifying it
call codes_set(igribclone,'dataDate',date1)
call codes_set(igribclone,'table2Version',table2Version)
call codes_set(igribclone,'indicatorOfParameter',indicatorOfParameter)
call codes_set(igribclone,'stepType',stepType)
call codes_set(igribclone,'startStep',startStep)
call codes_set(igribclone,'endStep',endStep)
call codes_set(igribclone,'decimalPrecision',decimalPrecision)
call codes_set(igribclone,'values',v)
call codes_write(igribclone,outfile)
call codes_grib_new_from_file(datafile,igribdata,err)
if (err==0) then
call codes_get(igribdata,'values',v2)
v2=v2*1000.0 ! different units for the output grib
v=v2-v1 ! accumulation from startStep to endStep
v1=v2 ! save previous step field
startStep=startStep+12
endStep=endStep+12
endif
enddo
call codes_release(igribsample)
deallocate(v)
deallocate(v1)
deallocate(v2)
call codes_close_file(outfile)
end program sample
|
