bufr_read_temp

/*
 * Copyright 2005-2015 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.
 */

/*
 * C Implementation: bufr_read_temp
 *
 * Description: how to read temperature significant levels from TEMP BUFR messages.
 *
 */
 
/* 
 * Please note that TEMP reports can be encoded in various ways in BUFR. Therefore the code
 * below might not work directly for other types of TEMP messages than the one used in the
 * example. It is advised to use bufr_dump to understand the structure of the messages.
 */

#include "eccodes.h"

int main(int argc,char* argv[])
{
    FILE* in = NULL;

    /* Message handle. Required in all the eccodes calls acting on a message.*/
    codes_handle* h=NULL;

    double *sigt_pres=NULL, *sigt_geo=NULL, *sigt_t=NULL;
    double *sigt_td=NULL;
    long longVal;
    double doubleVal;
    size_t sigt_len=0, desc_len=0, len=0;
    int i, err=0;
    int cnt=0;
    const char* infile = "../../data/bufr/temp_101.bufr";
    char key_name[128];

    in=fopen(infile,"r");
    if (!in) {
        printf("ERROR: unable to open file %s\n", infile);
        return 1;
    }

    /* Loop over the messages in the bufr file */
    while ((h = codes_handle_new_from_file(NULL,in,PRODUCT_BUFR,&err)) != NULL || err != CODES_SUCCESS)
    {
        if (h == NULL) {
            printf("Error: unable to create handle for message %d\n",cnt);
            cnt++;
            continue;
        }

        printf("message: %d\n",cnt);

        /* We need to instruct ecCodes to expand the descriptors
           i.e. unpack the data values */
        CODES_CHECK(codes_set_long(h,"unpack",1),0);

        /* In what follows we rely on the fact that for
         * temperature significant levels the value of key
         * verticalSoundingSignificance is 4 (see flag table 8001 for details).
         *
         * In our BUFR message verticalSoundingSignificance is always followed by
         *    geopotential, airTemperature, dewpointTemperature,
         *    windDirection, windSpeed and pressure. 
         * So in order to access any of these keys we need to use the
         * condition: verticalSoundingSignificance=4.
         */

        /* Get the number of the temperature significant levels.*/

        /* We find out the number of temperature significant levels by
         * counting how many pressure values we have on these levels.*/

        sprintf(key_name,"/verticalSoundingSignificance=4/pressure");
        CODES_CHECK(codes_get_size(h,key_name,&sigt_len),0);

        printf("Number of T significant levels: %ld\n",sigt_len);

        /* Allocate memory for the values to be read. Each
         * parameter must have the same number of values. */
        sigt_pres = (double*)malloc(sigt_len*sizeof(double));
        sigt_geo = (double*)malloc(sigt_len*sizeof(double));
        sigt_t = (double*)malloc(sigt_len*sizeof(double));
        sigt_td = (double*)malloc(sigt_len*sizeof(double));

        /* Get pressure */
        sprintf(key_name,"/verticalSoundingSignificance=4/pressure");

        /* Get the values */
        len=sigt_len;
        CODES_CHECK(codes_get_double_array(h,key_name,sigt_pres,&len),0);

        /* Get geopotential */
        sprintf(key_name,"/verticalSoundingSignificance=4/geopotential");

        /* Check the size*/
        CODES_CHECK(codes_get_size(h,key_name,&len),0);
        if(len != sigt_len)
        {
            printf("inconsistent number of geopotential values found!\n");
            return 1;
        }

        /* Get the values */
        CODES_CHECK(codes_get_double_array(h,key_name,sigt_geo,&len),0);

        /* Get temperature */
        sprintf(key_name,"/verticalSoundingSignificance=4/airTemperature");

        /* Check the size*/
        if(len != sigt_len)
        {
            printf("inconsistent number of temperature values found!\n");
            return 1;
        }

        /* Get the values */
        CODES_CHECK(codes_get_double_array(h,key_name,sigt_t,&len),0);

        /* Get dew point */
        sprintf(key_name,"/verticalSoundingSignificance=4/dewpointTemperature");

        /* Check the size*/
        if(len != sigt_len)
        {
            printf("inconsistent number of dewpoint temperature values found!\n");
            return 1;
        }

        /* Get the values */
        CODES_CHECK(codes_get_double_array(h,key_name,sigt_td,&len),0);

        /* Print the values */
        printf("lev  pres    geo    t    td\n");
        printf("-------------------------------\n");

        for(i=0; i < sigt_len; i++)
        {
            printf("%3d %6.0f %6.0f %.1f %.1f\n",
                    i+1,sigt_pres[i],sigt_geo[i],sigt_t[i],sigt_td[i]);
        }

        /* Delete handle */
        codes_handle_delete(h);

        /* Release memory */
        free(sigt_pres);
        free(sigt_geo);
        free(sigt_t);
        free(sigt_td);

        cnt++;
    }

    fclose(in);
    return 0;
}

!
!Copyright 2005-2015 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.
!
!
! FOTRAN 90 Implementation: bufr_read_temp
!
! Description: how to read temperature significant levels from TEMP BUFR messages.
!
! Please note that TEMP reports can be encoded in various ways in BUFR. Therefore the code
! below might not work directly for other types of TEMP messages than the one used in the
! example. It is advised to use bufr_dump first to understand the structure of these messages.

program bufr_read_temp
use eccodes
implicit none
integer            :: ifile
integer            :: iret
integer            :: ibufr
integer            :: i, count=0
integer(kind=4)    :: num
real(kind=8), dimension(:), allocatable :: presVal,geoVal,tVal ,tdVal
character(len=128)   :: keyName

  call codes_open_file(ifile,'../../data/bufr/temp_101.bufr','r')

! the first bufr message is loaded from file
! ibufr is the bufr id to be used in subsequent calls
  call codes_bufr_new_from_file(ifile,ibufr,iret)

  do while (iret/=CODES_END_OF_FILE)

    write(*,*) 'message: ',count

    ! we need to instruct ecCodes to expand all the descriptors 
    ! i.e. unpack the data values
    call codes_set(ibufr,"unpack",1);
 
    ! In what follows we rely on the fact that for 
    ! temperature significant levels the value of key 
    ! verticalSoundingSignificance is 4 (see flag table 8001 for details).
    !
    ! In our BUFR message verticalSoundingSignificance is always followed by
    !      geopotential, airTemperature, dewpointTemperature,
    !      windDirection, windSpeed and pressure. 
    ! 
    ! So in order to access any of these keys we need to use the
    ! condition: verticalSoundingSignificance=4.

    ! ---- Get pressure ---------------------------
    call codes_get(ibufr,'/verticalSoundingSignificance=4/pressure',presVal);

    ! ---- Get gepotential ------------------------
    call codes_get(ibufr,'/verticalSoundingSignificance=4/geopotential',geoVal)

    ! ---- Get temperature --------------------------------
    call codes_get(ibufr,'/verticalSoundingSignificance=4/airTemperature',tVal)    
     
    ! ---- Get dew point temperature  -----------------------
    call codes_get(ibufr,'/verticalSoundingSignificance=4/dewpointTemperature',tdVal)        

    ! ---- Check that all arrays are same size
    if (size(presVal)/=size(geoVal) .or. size(tVal)/=size(tdVal) .or. size(tdVal)/=size(presVal)) then
      print *,'inconsistent array dimension'
      exit
    endif
    num=size(presVal)
     
    ! ---- Print the values --------------------------------
    write(*,*) 'level    pres    geo    t    td'
    write(*,*) "--------------------------------------" 
     
    do i=1,num
        write(*,*) i,presVal(i),geoVal(i),tVal(i),tdVal(i)
    end do 
     
    
    ! free arrays 
    deallocate(presVal)
    deallocate(geoVal)
    deallocate(tVal)
    deallocate(tdVal) 

    ! release the bufr message
    call codes_release(ibufr)

    ! load the next bufr message
    call codes_bufr_new_from_file(ifile,ibufr,iret)
    
    count=count+1
    
  end do  

! close file  
  call codes_close_file(ifile)
 

end program bufr_read_temp

# Copyright 2005-2015 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.

#
# Python implementation: bufr_read_temp
#
# Description: how to read temperature  significant levels from TEMP BUFR messages.
#
#
# Please note that TEMP reports can be encoded in various ways in BUFR. Therefore the code
# below might not work directly for other types of TEMP messages than the one used in the
# example. It is advised to use bufr_dump to understand the structure of the messages.
#

import traceback
import sys

from eccodes import *

INPUT='../../data/bufr/temp_101.bufr'
VERBOSE=1 # verbose error reporting

def example():

    # open bufr file
    f = open(INPUT)

    cnt=0

    # loop for the messages in the file
    while 1:
        # get handle for message
        gid = codes_bufr_new_from_file(f)
        if gid is None: break

        print "message: %s" % cnt

        # we need to instruct ecCodes to expand all the descriptors
        # i.e. unpack the data values
        codes_set(gid,'unpack',1)

        # In what follows we rely on the fact that for
        # temperature  significant levels the value of key
        # verticalSoundingSignificance is 4 (see flag table 8001 for details).

        # We also make use of the fact that in our BUFR message
        # verticalSoundingSignificance is always followed by geopotential,
        # airTemperature, dewpointTemperature,
        # windDirection, windSpeed and pressure.

        # Get the number of the temperature significant levels.

        # We find out the number of temperature significant levels by
        # counting how many pressure values we have on these levels.

        numSigT=codes_get_size(gid,"/verticalSoundingSignificance=4/pressure")
        print  '  Number of temperature significant levels %ld' % (numSigT)

        # Get pressure
        sigt_pres=codes_get_array(gid,"/verticalSoundingSignificance=4/pressure")

        # Get gepotential
        sigt_geo=codes_get_array(gid,"/verticalSoundingSignificance=4/geopotential")

        # Get temperature
        sigt_t=codes_get_array(gid,"/verticalSoundingSignificance=4/airTemperature")
        
        # Get dew point
        sigt_td=codes_get_array(gid,"/verticalSoundingSignificance=4/dewpointTemperature")

        # Check that all arrays are same size
        if len(sigt_pres) != numSigT or len(sigt_geo) != numSigT or len(sigt_t) != numSigT or len(sigt_td) != numSigT :
            print 'inconsistent array dimension'       
            return 1

        # Print the values
        print "lev  pres    geo    t    td"
        print "-------------------------------"

        for i in xrange(numSigT):
            print "%3d %6.0f %6.0f %.1f %.1f" % (i+1,sigt_pres[i],sigt_geo[i],sigt_t[i],sigt_td[i])

        cnt+=1

        # delete handle
        codes_release(gid)

    # close the file
    f.close()

def main():
    try:
        example()
    except CodesInternalError,err:
        if VERBOSE:
            traceback.print_exc(file=sys.stderr)
        else:
            print >>sys.stderr,err.msg

        return 1

if __name__ == "__main__":
    sys.exit(main())