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<h1>set_pv.f90</h1>How to set the list of levels.<p>
<div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 ! Copyright 2005-2007 ECMWF
<a name="l00002"></a>00002 !
<a name="l00003"></a>00003 ! Licensed under the GNU Lesser General Public License which
<a name="l00004"></a>00004 ! incorporates the terms and conditions of version 3 of the GNU
<a name="l00005"></a>00005 ! General Public License.
<a name="l00006"></a>00006 ! See LICENSE and gpl-3.0.txt <span class="keywordflow">for</span> details.
<a name="l00007"></a>00007 !
<a name="l00008"></a>00008 !
<a name="l00009"></a>00009 ! Description: how to <span class="keyword">set</span> pv values.
<a name="l00010"></a>00010 !
<a name="l00011"></a>00011 !
<a name="l00012"></a>00012 ! Author: Anne Fouilloux
<a name="l00013"></a>00013 !
<a name="l00014"></a>00014 !
<a name="l00015"></a>00015 program set_pv
<a name="l00016"></a>00016 use grib_api
<a name="l00017"></a>00017 implicit none
<a name="l00018"></a>00018 integer :: numberOfLevels
<a name="l00019"></a>00019 integer :: numberOfCoefficients
<a name="l00020"></a>00020 integer :: outfile, igrib
<a name="l00021"></a>00021 integer :: i, ios
<a name="l00022"></a>00022 real, dimension(:),allocatable :: pv
<a name="l00023"></a>00023
<a name="l00024"></a>00024 numberOfLevels=60
<a name="l00025"></a>00025 numberOfCoefficients=2*(numberOfLevels+1)
<a name="l00026"></a>00026
<a name="l00027"></a>00027 allocate(pv(numberOfCoefficients))
<a name="l00028"></a>00028
<a name="l00029"></a>00029 ! read the model level coefficients from file
<a name="l00030"></a>00030 open( unit=1, file=<span class="stringliteral">"../../data/60_model_levels"</span>, &
<a name="l00031"></a>00031 form=<span class="stringliteral">"formatted"</span>,action=<span class="stringliteral">"read"</span>)
<a name="l00032"></a>00032
<a name="l00033"></a>00033 <span class="keywordflow">do</span> i=1,numberOfCoefficients,2
<a name="l00034"></a>00034 read(unit=1,fmt=*, iostat=ios) pv(i), pv(i+1)
<a name="l00035"></a>00035 if (ios /= 0) then
<a name="l00036"></a>00036 print *, "I/O error: ",ios
<a name="l00037"></a>00037 exit
<a name="l00038"></a>00038 end if
<a name="l00039"></a>00039 end do
<a name="l00040"></a>00040
<a name="l00041"></a>00041 ! print coefficients
<a name="l00042"></a>00042 !do i=1,numberOfCoefficients,2
<a name="l00043"></a>00043 ! print *," a=",pv(i)," b=",pv(i+1)
<a name="l00044"></a>00044 !end do
<a name="l00045"></a>00045
<a name="l00046"></a>00046 close(unit=1)
<a name="l00047"></a>00047
<a name="l00048"></a>00048 call grib_open_file(outfile, 'out.grib1','w')
<a name="l00049"></a>00049
<a name="l00050"></a>00050 ! a new grib message is loaded from file
<a name="l00051"></a>00051 ! igrib is the grib <span class="keywordtype">id</span> to be used in subsequent calls
<a name="l00052"></a>00052 call grib_new_from_samples(igrib, "reduced_gg_sfc_grib1")
<a name="l00053"></a>00053
<a name="l00054"></a>00054 ! set levtype to ml (model level)
<a name="l00055"></a>00055 call grib_set(igrib,'levtype','ml')
<a name="l00056"></a>00056
<a name="l00057"></a>00057 ! set level
<a name="l00058"></a>00058 call grib_set(igrib,'level',2)
<a name="l00059"></a>00059
<a name="l00060"></a>00060 ! set PVPresent as an integer
<a name="l00061"></a>00061 call grib_set(igrib,'PVPresent',1)
<a name="l00062"></a>00062
<a name="l00063"></a>00063 call grib_set(igrib,'pv',pv)
<a name="l00064"></a>00064
<a name="l00065"></a>00065 ! write modified message to a file
<a name="l00066"></a>00066 call grib_write(igrib,outfile)
<a name="l00067"></a>00067
<a name="l00068"></a>00068 ! FREE MEMORY
<a name="l00069"></a>00069 call grib_release(igrib)
<a name="l00070"></a>00070 deallocate(pv)
<a name="l00071"></a>00071
<a name="l00072"></a>00072 call grib_close_file(outfile)
<a name="l00073"></a>00073
<a name="l00074"></a>00074 end program set_pv
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