source: flexpart.git/src/readreceptors.f90 @ d7935de

!**********************************************************************
! Copyright 1998,1999,2000,2001,2002,2005,2007,2008,2009,2010         *
! Andreas Stohl, Petra Seibert, A. Frank, Gerhard Wotawa,             *
! Caroline Forster, Sabine Eckhardt, John Burkhart, Harald Sodemann   *
!                                                                     *
! This file is part of FLEXPART.                                      *
!                                                                     *
! FLEXPART is free software: you can redistribute it and/or modify    *
! it under the terms of the GNU General Public License as published by*
! the Free Software Foundation, either version 3 of the License, or   *
! (at your option) any later version.                                 *
!                                                                     *
! FLEXPART is distributed in the hope that it will be useful,         *
! but WITHOUT ANY WARRANTY; without even the implied warranty of      *
! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the       *
! GNU General Public License for more details.                        *
!                                                                     *
! You should have received a copy of the GNU General Public License   *
! along with FLEXPART.  If not, see <http://www.gnu.org/licenses/>.   *
!**********************************************************************

subroutine readreceptors

  !*****************************************************************************
  !                                                                            *
  !     This routine reads the user specifications for the receptor points.    *
  !                                                                            *
  !     Author: A. Stohl                                                       *
  !     1 August 1996        
  !                                                  *
  !     HSO, 14 August 2013: Added optional namelist input
  !     PS, 2/2015: access= -> position=
  !     PS, 6/2015: variable names, simplify code
  !                                                                            *
  !*****************************************************************************
  !                                                                            *
  ! Variables:                                                                 *
  ! receptorarea(maxreceptor)  area of dx*dy at location of receptor           *
  ! receptorname(maxreceptor)  names of receptors                              *
  ! xreceptor,yreceptor  coordinates of receptor points                        *
  !                                                                            *
  ! Constants:                                                                 *
  ! unitreceptor         unit connected to file RECEPTORS                      *
  !                                                                            *
  !*****************************************************************************

  use par_mod
  use com_mod

  implicit none

  integer :: j
  real :: x,y,xm,ym
  character(len=16) :: receptor

  integer :: ios
  real :: xlon,ylat   ! for namelist input, lon/lat are used instead of x,y
  integer,parameter :: unitreceptorout=2

  ! declare namelist
  namelist /nml_receptors/ receptor, xlon, ylat

!CPS I comment this out - why should we not have receptor output in bwd runs? 
  ! For backward runs, do not allow receptor output. Thus, set number of
  ! receptors to zero
  !*****************************************************************************

!  if (ldirect.lt.0) then
!    numreceptor=0
!    return
!  endif


  ! Open the RECEPTORS file and read output grid specifications
  !************************************************************

  open(unitreceptor,file=path(1)(1:length(1))//'RECEPTORS',form='formatted',&
    status='old',err=999)

  ! try namelist input
  read(unitreceptor,nml_receptors,iostat=ios)

  ! prepare namelist output if requested
  if (nmlout) open(unitreceptorout,file=path(2)(1:length(2))// &
    'RECEPTORS.namelist', position='append',status='new',err=1000)

  if (ios .ne. 0) then ! read as regular text file

    close(unitreceptor)
    open(unitreceptor,file=path(1)(1:length(1))// &
     'RECEPTORS',status='old',err=999)
 
    call skplin(5,unitreceptor)

    ! Read the names and coordinates of the receptors
    !************************************************

    j=0
100 j=j+1
    read(unitreceptor,*,end=99)
    read(unitreceptor,*,end=99)
    read(unitreceptor,*,end=99)
    read(unitreceptor,'(4x,a16)',end=99) receptor
    call skplin(3,unitreceptor)
      read(unitreceptor,'(4x,f11.4)',end=99) xlon
    call skplin(3,unitreceptor)
      read(unitreceptor,'(4x,f11.4)',end=99) ylat
      if ((xlon.eq.0.).and.(ylat.eq.0.).and. &
         (receptor.eq.'                ')) then
      j=j-1
      goto 100
    endif
    if (j.gt.maxreceptor) then
      write(*,*) ' #### FLEXPART MODEL ERROR! TOO MANY RECEPTOR #### '
      write(*,*) ' #### POINTS ARE GIVEN.                       #### '
      write(*,*) ' #### MAXIMUM NUMBER IS ',maxreceptor,'       #### '
      write(*,*) ' #### PLEASE MAKE CHANGES IN FILE RECEPTORS   #### '
    endif
    receptorname(j)=receptor
      xreceptor(j)=(xlon-xlon0)/dx       ! transform to grid coordinates
      yreceptor(j)=(ylat-ylat0)/dy
      xm=r_earth*cos(ylat*pi/180.)*dx/180.*pi
    ym=r_earth*dy/180.*pi
    receptorarea(j)=xm*ym
  ! write receptors file in namelist format to output directory if requested
    if (nmlout.and.lroot) write(unitreceptorout,nml=nml_receptors)

    goto 100

99  numreceptor=j-1

  else ! continue with namelist input

    j=0
    do while (ios .eq. 0)
      j=j+1
      read(unitreceptor,nml_receptors,iostat=ios)
      if (ios .eq. 0) then
        if (j.gt.maxreceptor) then
          write(*,*) ' #### FLEXPART MODEL ERROR! TOO MANY RECEPTOR #### '
          write(*,*) ' #### POINTS ARE GIVEN.                       #### '
          write(*,*) ' #### MAXIMUM NUMBER IS ',maxreceptor,'       #### '
          write(*,*) ' #### PLEASE MAKE CHANGES IN FILE RECEPTORS   #### '
        endif
        receptorname(j)=receptor
        xreceptor(j)=(xlon-xlon0)/dx       ! transform to grid coordinates
        yreceptor(j)=(ylat-ylat0)/dy
        xm=r_earth*cos(ylat*pi/180.)*dx/180.*pi
        ym=r_earth*dy/180.*pi
        receptorarea(j)=xm*ym
      endif

    ! write receptors file in namelist format to output directory if requested
      if (nmlout.and.lroot) write(unitreceptorout,nml=nml_receptors)

    end do
    numreceptor=j-1
    close(unitreceptor)

  endif ! end no-nml / nml bloc

  if (nmlout .and. lroot) close(unitreceptorout)

  return


999 write(*,*) ' #### FLEXPART MODEL ERROR! FILE "RECEPTORS"  #### '
  write(*,*)   ' #### CANNOT BE OPENED IN THE DIRECTORY       #### '
  write(*,'(a)') trim(path(1))
  stop

1000 write(*,*) ' #### FLEXPART MODEL ERROR! FILE "RECEPTORS"  #### '
  write(*,*)    ' #### CANNOT BE OPENED IN THE DIRECTORY       #### '
  write(*,'(a)') trim(path(2))
  stop

end subroutine readreceptors