SUBROUTINE user_data_output_2d( av, variable, found, grid, local_pf, two_d )

!--------------------------------------------------------------------------------!
! This file is part of PALM.
!
! PALM 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.
!
! PALM 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
! PALM. If not, see <http://www.gnu.org/licenses/>.
!
! Copyright 1997-2012  Leibniz University Hannover
!--------------------------------------------------------------------------------!
!
! Current revisions:
! -----------------
!
! Former revisions:
! -----------------
! $Id: user_data_output_2d.f90 1037 2012-10-22 14:10:22Z gryschka $
!
! 1036 2012-10-22 13:43:42Z raasch
! code put under GPL (PALM 3.9)
!
! 667 2010-12-23 12:06:00Z suehring/gryschka
! nxl-1, nxr+1, nys-1, nyn+1 replaced by nxlg, nxrg, nysg, nyng
!
! 343 2009-06-24 12:59:09Z maronga
! +dummy argument two_d
!
! 211 2008-11-11 04:46:24Z raasch
! Former file user_interface.f90 split into one file per subroutine
!
! Description:
! ------------
! Resorts the user-defined output quantity with indices (k,j,i) to a
! temporary array with indices (i,j,k) and sets the grid on which it is defined.
! Allowed values for grid are "zu" and "zw".
!------------------------------------------------------------------------------!

    USE indices
    USE user

    IMPLICIT NONE

    CHARACTER (LEN=*) ::  grid, variable

    INTEGER ::  av, i, j, k

    LOGICAL ::  found, two_d

    REAL, DIMENSION(nxlg:nxrg,nysg:nyng,nzb:nzt+1) ::  local_pf


    found = .TRUE.

    SELECT CASE ( TRIM( variable ) )

!
!--    Uncomment and extend the following lines, if necessary.
!--    The arrays for storing the user defined quantities (here u2 and u2_av)
!--    have to be declared and defined by the user!
!--    Sample for user-defined output:
!       CASE ( 'u2_xy', 'u2_xz', 'u2_yz' )
!          IF ( av == 0 )  THEN
!             DO  i = nxlg, nxrg
!                DO  j = nysg, nyng
!                   DO  k = nzb, nzt+1
!                      local_pf(i,j,k) = u2(k,j,i)
!                   ENDDO
!                ENDDO
!             ENDDO
!          ELSE
!             DO  i = nxlg, nxrg
!                DO  j = nysg, nyng
!                   DO  k = nzb, nzt+1
!                      local_pf(i,j,k) = u2_av(k,j,i)
!                   ENDDO
!                ENDDO
!             ENDDO
!          ENDIF
!
!          grid = 'zu'


       CASE DEFAULT
          found = .FALSE.
          grid  = 'none'

    END SELECT


 END SUBROUTINE user_data_output_2d