GET_NEAREST_NODE_PGM.f90

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!    Copyright (C) 2012 The SPEED FOUNDATION
!    Author: Ilario Mazzieri
!
!    This file is part of SPEED.
!
!    SPEED is free software; you can redistribute it and/or modify it
!    under the terms of the GNU Affero General Public License as
!    published by the Free Software Foundation, either version 3 of the
!    License, or (at your option) any later version.
!
!    SPEED 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
!    Affero General Public License for more details.
!
!    You should have received a copy of the GNU Affero General Public License
!    along with SPEED.  If not, see <http://www.gnu.org/licenses/>.
 
 
      subroutine get_nearest_node_pgm(nloc,xs,ys,zs,xt,yt,zt,nt,dist_min,elevation)
      
      implicit none
      
      integer*4 :: i, nloc, nt
 
      real*8 :: xt,yt,zt
      real*8 :: elevation
      real*8 :: dist,dist_min
 
      real*8, dimension(nloc) :: xs, ys, zs
      
      dist_min = 1.0d30
      nt = 1
 
      do i = 1,nloc
 
         if (zs(i) .gt. elevation) then
            
            dist = dsqrt((xs(i) - xt)*(xs(i) - xt) + (ys(i) - yt)*(ys(i) - yt) + (zs(i) - zt)*(zs(i) - zt)) 
 
            if (dist .lt. dist_min) then
               dist_min = dist; nt = i
            endif
 
        endif
 
      enddo
      
      return
      end subroutine get_nearest_node_pgm