SUBROUTINE user_define_netcdf_grid( variable, found, grid_x, grid_y, grid_z )

!--------------------------------------------------------------------------------!
! 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_define_netcdf_grid.f90 1037 2012-10-22 14:10:22Z fricke $
!
! 1036 2012-10-22 13:43:42Z raasch
! code put under GPL (PALM 3.9)
!
! 211 2008-11-11 04:46:24Z raasch
! Former file user_interface.f90 split into one file per subroutine
!
! Description:
! ------------
! Set the grids on which user-defined output quantities are defined.
! Allowed values for grid_x are "x" and "xu", for grid_y "y" and "yv", and
! for grid_z "zu" and "zw".
!------------------------------------------------------------------------------!

    USE user

    IMPLICIT NONE

    CHARACTER (LEN=*) ::  grid_x, grid_y, grid_z, variable

    LOGICAL ::  found


    SELECT CASE ( TRIM( variable ) )

!
!--    Uncomment and extend the following lines, if necessary
!       CASE ( 'u2', 'u2_xy', 'u2_xz', 'u2_yz' )
!          grid_x = 'xu'
!          grid_y = 'y'
!          grid_z = 'zu'

!       CASE ( 'u*v*', 'u*v*_xy', 'u*v*_xz', 'u*v*_yz' )
!          grid_x = 'x'
!          grid_y = 'y'
!          grid_z = 'zu'

       CASE DEFAULT
          found  = .FALSE.
          grid_x = 'none'
          grid_y = 'none'
          grid_z = 'none'

    END SELECT


 END SUBROUTINE user_define_netcdf_grid