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AppGridCreate.F90
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AppGridCreate.F90
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! routine to create the global edges and centers of the cubed-sphere grid
! but not the ESMF grid
subroutine AppCSEdgeCreateF(IM_WORLD, LonEdge,LatEdge, LonCenter, LatCenter, rc)
#include "MAPL_Generic.h"
use ESMF
use MAPL
use MAPL_ConstantsMod, only : pi=> MAPL_PI_R8
use fv_arrays_mod, only: REAL4, REAL8, R_GRID
use fv_grid_utils_mod, only: gnomonic_grids, cell_center2, direct_transform
use fv_grid_tools_mod, only: mirror_grid
use FV_StateMod, only: FV_Atm
implicit none
! !ARGUMENTS:
integer, intent(IN) :: IM_WORLD
integer, optional, intent(OUT) :: rc
real(ESMF_KIND_R8), intent(inout) :: LonEdge(IM_World+1,IM_World+1,6)
real(ESMF_KIND_R8), intent(inout) :: LatEdge(IM_World+1,IM_World+1,6)
real(ESMF_KIND_R8), optional, intent(inout) :: LonCenter(IM_World,IM_World)
real(ESMF_KIND_R8), optional, intent(inout) :: LatCenter(IM_World,IM_World)
! ErrLog variables
!-----------------
integer :: STATUS
character(len=ESMF_MAXSTR), parameter :: Iam="AppCSEdgeCreateF"
! Local variables
!-----------------
#ifdef EIGHT_BYTE
integer, parameter:: f_p = selected_real_kind(15) ! same as 12 on Altix
#else
! Higher precisions for grid geometrical factors:
integer, parameter:: f_p = selected_real_kind(20)
#endif
integer, parameter :: grid_type = 0
integer :: npts
integer :: ntiles=6
integer :: ndims=2
integer :: I, J, N
integer :: IG, JG
real(ESMF_KIND_R8) :: alocs(2)
real(R_GRID), allocatable :: grid_global(:,:,:,:)
integer :: L
npts = IM_World
allocate( grid_global(npts+1,npts+1,ndims,ntiles) )
call gnomonic_grids(grid_type, npts, grid_global(:,:,1,1), grid_global(:,:,2,1))
! mirror_grid assumes that the tile=1 is centered on equator and greenwich meridian Lon[-pi,pi]
call mirror_grid(grid_global, 0, npts+1, npts+1, 2, 6)
if (allocated(FV_Atm)) then
if (.not. FV_Atm(1)%flagstruct%do_schmidt) &
grid_global(:,:,1,:) = grid_global(:,:,1,:) - PI/FV_Atm(1)%flagstruct%shift_fac
else
grid_global(:,:,1,:) = grid_global(:,:,1,:) - PI/18.0
end if
where(grid_global(:,:,1,:) < 0.) &
grid_global(:,:,1,:) = grid_global(:,:,1,:) + 2.* PI
! Keep Equator and Greenwich exact
!---------------------------------
where(abs(grid_global(:,:,:,1)) < 1.d-10) grid_global(:,:,:,1) = 0.0
!---------------------------------
! Clean Up Corners
!---------------------------------
grid_global( 1,1:npts+1,:,2)=grid_global(npts+1,1:npts+1,:,1)
grid_global( 1,1:npts+1,:,3)=grid_global(npts+1:1:-1,npts+1,:,1)
grid_global(1:npts+1,npts+1,:,5)=grid_global(1,npts+1:1:-1,:,1)
grid_global(1:npts+1,npts+1,:,6)=grid_global(1:npts+1,1,:,1)
grid_global(1:npts+1, 1,:,3)=grid_global(1:npts+1,npts+1,:,2)
grid_global(1:npts+1, 1,:,4)=grid_global(npts+1,npts+1:1:-1,:,2)
grid_global(npts+1,1:npts+1,:,6)=grid_global(npts+1:1:-1,1,:,2)
grid_global( 1,1:npts+1,:,4)=grid_global(npts+1,1:npts+1,:,3)
grid_global( 1,1:npts+1,:,5)=grid_global(npts+1:1:-1,npts+1,:,3)
grid_global(npts+1,1:npts+1,:,3)=grid_global(1,1:npts+1,:,4)
grid_global(1:npts+1, 1,:,5)=grid_global(1:npts+1,npts+1,:,4)
grid_global(1:npts+1, 1,:,6)=grid_global(npts+1,npts+1:1:-1,:,4)
grid_global( 1,1:npts+1,:,6)=grid_global(npts+1,1:npts+1,:,5)
!------------------------
! Schmidt transformation:
!------------------------
if (allocated(FV_Atm)) then
if ( FV_Atm(1)%flagstruct%do_schmidt ) then
do n=1,ntiles
call direct_transform(FV_Atm(1)%flagstruct%stretch_fac, 1, npts+1, 1, npts+1, FV_Atm(1)%flagstruct%target_lon, FV_Atm(1)%flagstruct%target_lat, &
n, grid_global(1:npts+1,1:npts+1,1,n), grid_global(1:npts+1,1:npts+1,2,n))
enddo
endif
end if
if (present(LonCenter) .and. present(LatCenter)) then
do n=1,ntiles
do j=1,npts
do i=1,npts
call cell_center2(grid_global(i,j, 1:2,n), grid_global(i+1,j, 1:2,n), &
grid_global(i,j+1,1:2,n), grid_global(i+1,j+1,1:2,n), &
alocs)
jg = (n-1)*npts + j
LonCenter(i,jg) = alocs(1)
LatCenter(i,jg) = alocs(2)
enddo
enddo
enddo
end if
LonEdge = grid_global(:,:,1,:)
LatEdge = grid_global(:,:,2,:)
deallocate( grid_global )
RETURN_(ESMF_SUCCESS)
end subroutine AppCSEdgeCreateF
!!!!!!!!!!!!!!!%%%%%%%%%%%%%%%%%%%%%%%!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
function AppGridCreateF(IM_WORLD, JM_WORLD, LM, NX, NY, rc) result(esmfgrid)
#include "MAPL_Generic.h"
#define DEALLOCGLOB_(A) if(associated(A))then;A=0;if(MAPL_ShmInitialized)then; call MAPL_DeAllocNodeArray(A,rc=STATUS);else; deallocate(A,stat=STATUS);endif;VERIFY_(STATUS);NULLIFY(A);endif
use ESMF
use MAPL, pi=> MAPL_PI_R8
use fv_arrays_mod, only: REAL4, REAL8, R_GRID
use fv_grid_utils_mod, only: gnomonic_grids, cell_center2, direct_transform
use fv_grid_tools_mod, only: mirror_grid
use FV_StateMod, only: FV_Atm
implicit none
! !ARGUMENTS:
integer, intent(IN) :: IM_WORLD, JM_WORLD, LM
integer, intent(IN) :: NX, NY
integer, optional, intent(OUT) :: rc
type (ESMF_Grid) :: esmfgrid
! ErrLog variables
!-----------------
integer :: STATUS
character(len=ESMF_MAXSTR), parameter :: Iam="AppGridCreateF"
! Local variables
!-----------------
type(ESMF_DistGrid) :: distGrid
integer :: DECOUNT(2)
integer :: GLOBAL_DE_START(2)
integer :: NX2, NY2
integer :: NPES, NPES_X, NPES_Y
integer :: NPX, NPY
integer :: isg, ieg
integer :: jsg, jeg
integer :: is, ie
integer :: js, je
integer :: myTile
integer :: npts
integer :: ntiles, grid_type
integer :: ndims=2
integer :: I, J, N
integer :: IG, JG
real(REAL8) :: deglon=0.0
type (ESMF_Array), pointer :: coords(:)
real(REAL8), pointer :: lons(:,:)
real(REAL8), pointer :: lats(:,:)
type (ESMF_Array), target :: tarray(2)
real(REAL8) :: alocs(2), dx, dy
integer :: L
integer, allocatable :: IMS(:), JMS(:)
character(len=ESMF_MAXSTR) :: gridname, FMT, FMTIM, FMTJM
type (ESMF_VM) :: VM
type (ESMF_Config) :: cf
real(REAL8), allocatable :: gridCornerLats(:)
real(REAL8), allocatable :: gridCornerLons(:)
integer :: idx
real(R_GRID), pointer :: grid_global(:,:,:,:) => null()
logical :: AppGridStandAlone
! We need the VM to create the grid ??
!------------------------------------
AppGridStandAlone = .false.
call ESMF_VMGetCurrent(vm, rc=STATUS)
VERIFY_(STATUS)
! Check FV3 grid_type
! -------------------
cf = ESMF_ConfigCreate(rc=rc)
call ESMF_ConfigLoadFile( cf, 'fvcore_layout.rc', rc = rc )
call ESMF_ConfigGetAttribute( cf, ntiles, label = 'ntiles:', default=6, rc = rc )
call ESMF_ConfigGetAttribute( cf, grid_type, label = 'grid_type:', default=0, rc = rc )
call ESMF_ConfigDestroy(cf, rc=rc)
! Give the IMS and JMS the MAPL default distribution
! --------------------------------------------------
allocate( IMS(0:NX-1) )
allocate( JMS(0:NY-1) )
call GET_INT_FORMAT(IM_WORLD, FMTIM)
call GET_INT_FORMAT(JM_WORLD, FMTJM)
FMT = '(A,' // trim(FMTIM) //',A,' // trim(FMTJM) // ',A)'
if (grid_type <= 3) then
! Cubed-Sphere
call DecomposeDim ( IM_WORLD , IMS , NX )
call DecomposeDim ( JM_WORLD/6, JMS(0:NY/6 -1) , NY/6 )
do n=2,6
JMS((n-1)*NY/6 : n*NY/6 -1) = JMS(0:NY/6 -1)
enddo
write(gridname,trim(FMT)) 'PE',IM_WORLD,'x',JM_WORLD,'-CF'
else
! Doubly Periodic Cartesian
call DecomposeDim ( IM_WORLD , IMS , NX )
call DecomposeDim ( JM_WORLD , JMS , NY )
write(gridname,trim(FMT)) 'PE',IM_WORLD,'x',JM_WORLD,'-DP'
endif
! We should have a much simpler create with the next ESMF grid design
!--------------------------------------------------------------------
esmfgrid = ESMF_GridCreate( &
name=gridname, &
countsPerDEDim1=IMS, &
countsPerDEDim2=JMS, &
indexFlag = ESMF_INDEX_DELOCAL,&
gridEdgeLWidth = (/0,0/), &
gridEdgeUWidth = (/0,0/), &
coordDep1 = (/1,2/), &
coordDep2 = (/1,2/), &
rc=status)
VERIFY_(STATUS)
! Allocate coords at default stagger location
call ESMF_GridAddCoord(esmfgrid, rc=status)
VERIFY_(STATUS)
call ESMF_AttributeSet(esmfgrid, name='GRID_LM', value=LM, rc=status)
VERIFY_(STATUS)
if (grid_type <= 3) then
call ESMF_AttributeSet(esmfgrid, 'GridType', 'Cubed-Sphere', rc=STATUS)
VERIFY_(STATUS)
else
call ESMF_AttributeSet(esmfgrid, 'GridType', 'Doubly-Periodic', rc=STATUS)
VERIFY_(STATUS)
endif
! -------------
NPES_X = size(IMS)
NPES_Y = size(JMS)
NPES = NPES_X+NPES_Y
call MAPL_GRID_INTERIOR(esmfgrid,isg,ieg,jsg,jeg)
npx = IM_WORLD
npy = JM_WORLD
myTile = jsg/(npy/ntiles)
is = isg
ie = ieg
js = jsg - myTile*(npy/ntiles)
je = jeg - myTile*(npy/ntiles)
npts = (npy/ntiles)
if (npts /= npx) then
print*, 'Error npts /= npx', npts, npx
STATUS=1
endif
VERIFY_(STATUS)
if (.not.allocated(FV_Atm)) then
AppGridStandAlone = .true.
if(MAPL_ShmInitialized) then
call MAPL_AllocNodeArray(grid_global,Shp=(/npts+1,npts+1,ndims,ntiles/),rc=status)
VERIFY_(STATUS)
else
allocate( grid_global(npts+1,npts+1,ndims,ntiles) )
end if
if (grid_type <= 3) then
! Cubed-Sphere
call gnomonic_grids(grid_type, npts, grid_global(:,:,1,1), grid_global(:,:,2,1))
! mirror_grid assumes that the tile=1 is centered on equator and greenwich meridian Lon[-pi,pi]
call mirror_grid(grid_global, 0, npts+1, npts+1, 2, 6)
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
! ! MAT BMA You cannot refer to FV_Atm here because line 288 says this !
! ! is only for FV_Atm not allocated !
! !
! if (.not. FV_Atm(1)%flagstruct%do_schmidt) & !
! grid_global(:,:,1,:) = grid_global(:,:,1,:) - PI/FV_Atm(1)%flagstruct%shift_fac !
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
grid_global(:,:,1,:) = grid_global(:,:,1,:) - PI/18.0
where(grid_global(:,:,1,:) < 0.) &
grid_global(:,:,1,:) = grid_global(:,:,1,:) + 2.* PI
! Keep Equator and Greenwich exact
!---------------------------------
where(abs(grid_global(:,:,:,1)) < 1.d-10) grid_global(:,:,:,1) = 0.0
!---------------------------------
! Clean Up Corners
!---------------------------------
grid_global( 1,1:npts+1,:,2)=grid_global(npts+1,1:npts+1,:,1)
grid_global( 1,1:npts+1,:,3)=grid_global(npts+1:1:-1,npts+1,:,1)
grid_global(1:npts+1,npts+1,:,5)=grid_global(1,npts+1:1:-1,:,1)
grid_global(1:npts+1,npts+1,:,6)=grid_global(1:npts+1,1,:,1)
grid_global(1:npts+1, 1,:,3)=grid_global(1:npts+1,npts+1,:,2)
grid_global(1:npts+1, 1,:,4)=grid_global(npts+1,npts+1:1:-1,:,2)
grid_global(npts+1,1:npts+1,:,6)=grid_global(npts+1:1:-1,1,:,2)
grid_global( 1,1:npts+1,:,4)=grid_global(npts+1,1:npts+1,:,3)
grid_global( 1,1:npts+1,:,5)=grid_global(npts+1:1:-1,npts+1,:,3)
grid_global(npts+1,1:npts+1,:,3)=grid_global(1,1:npts+1,:,4)
grid_global(1:npts+1, 1,:,5)=grid_global(1:npts+1,npts+1,:,4)
grid_global(1:npts+1, 1,:,6)=grid_global(npts+1,npts+1:1:-1,:,4)
grid_global( 1,1:npts+1,:,6)=grid_global(npts+1,1:npts+1,:,5)
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
! ! MAT BMA You cannot refer to FV_Atm here because line 288 says this !
! ! is only for FV_Atm not allocated !
! !
! !------------------------ !
! ! Schmidt transformation: !
! !------------------------ !
! if ( FV_Atm(1)%flagstruct%do_schmidt ) then !
! do n=1,ntiles !
! call direct_transform(FV_Atm(1)%flagstruct%stretch_fac, 1, npts+1, 1, npts+1, FV_Atm(1)%flagstruct%target_lon, FV_Atm(1)%flagstruct%target_lat, & !
! n, grid_global(1:npts+1,1:npts+1,1,n), grid_global(1:npts+1,1:npts+1,2,n)) !
! enddo !
! endif !
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
else
if (MAPL_AM_I_ROOT()) write(*,*)'AppGridCreate can not make DP grid by itself'
_ASSERT(.false.,'needs informative message')
end if
end if
! Fill lat/lons at cell center locations
! Retrieve the coordinates so we can set them
call ESMF_GridGetCoord(esmfgrid, coordDim=1, localDE=0, &
staggerloc=ESMF_STAGGERLOC_CENTER, &
farrayPtr=lons, rc=status)
VERIFY_(STATUS)
call ESMF_GridGetCoord(esmfgrid, coordDim=2, localDE=0, &
staggerloc=ESMF_STAGGERLOC_CENTER, &
farrayPtr=lats, rc=status)
VERIFY_(STATUS)
! Save corners into the esmfgrid
!---------------------------
allocate(gridCornerLons((size(lons,1)+1)*(size(lons,2)+1)), stat=status)
VERIFY_(STATUS)
allocate(gridCornerLats((size(lats,1)+1)*(size(lats,2)+1)), stat=status)
VERIFY_(STATUS)
idx = 0
do jg=jsg,jeg+1
do ig=isg,ieg+1
i=ig
j=jg-myTile*npts
idx = idx + 1
if (AppGridStandAlone) then
gridCornerLons(idx) = grid_global(i, j, 1, myTile+1)
gridCornerLats(idx) = grid_global(i, j, 2, myTile+1)
else
gridCornerLons(idx) = FV_Atm(1)%gridstruct%grid(i,j,1)
gridCornerLats(idx) = FV_Atm(1)%gridstruct%grid(i,j,2)
end if
end do
end do
call ESMF_AttributeSet(esmfgrid, name='GridCornerLons:', &
itemCount = idx, valueList=gridCornerLons, rc=status)
VERIFY_(STATUS)
call ESMF_AttributeSet(esmfgrid, name='GridCornerLats:', &
itemCount = idx, valueList=gridCornerLats, rc=status)
VERIFY_(STATUS)
deallocate(gridCornerLats, stat=status)
VERIFY_(STATUS)
deallocate(gridCornerLons, stat=status)
VERIFY_(STATUS)
do jg=jsg,jeg
do ig=isg,ieg
i=ig
j=jg-myTile*npts
if (AppGridStandAlone) then
call cell_center2(grid_global(i,j, 1:2,myTile+1), grid_global(i+1,j, 1:2,myTile+1), &
grid_global(i,j+1,1:2,myTile+1), grid_global(i+1,j+1,1:2,myTile+1), &
alocs)
else
call cell_center2(dble(FV_Atm(1)%gridstruct%grid(i,j, 1:2)), &
dble(FV_Atm(1)%gridstruct%grid(i+1,j, 1:2)), &
dble(FV_Atm(1)%gridstruct%grid(i,j+1,1:2)), &
dble(FV_Atm(1)%gridstruct%grid(i+1,j+1,1:2)), &
alocs)
end if
i=ig-isg+1
j=jg-jsg+1
lons(i,j) = alocs(1)
lats(i,j) = alocs(2)
enddo
enddo
if (AppGridStandAlone) then
DEALLOCGLOB_(grid_global)
end if
call MAPL_MemUtilsWrite(VM, trim(Iam), RC=STATUS )
VERIFY_(STATUS)
RETURN_(ESMF_SUCCESS)
end function AppGridCreateF
subroutine AppGridCreate (META, esmfgrid, RC)
#include "MAPL_Generic.h"
use ESMF
use MAPL
use fv_arrays_mod, only: REAL4, REAL8, R_GRID
implicit none
! !ARGUMENTS:
type(MAPL_MetaComp), intent(INOUT) :: META
type (ESMF_Grid), intent( OUT) :: esmfgrid
integer, optional, intent( OUT) :: rc
! ErrLog variables
!-----------------
integer :: STATUS
character(len=ESMF_MAXSTR), parameter :: Iam="AppGridCreate"
! Local variables
!-----------------
integer :: IM_WORLD
integer :: JM_WORLD
integer :: LM
integer :: NX, NY
character(len=ESMF_MAXSTR) :: tmpname, gridname
character(len=ESMF_MAXSTR) :: FMT, FMTIM, FMTJM
real(REAL8) :: deglon=0.0
interface
function AppGridCreateF(IM_WORLD, JM_WORLD, LM, NX, NY, rc)
use ESMF
implicit none
type(ESMF_Grid) :: AppGridCreateF
integer, intent(IN) :: IM_WORLD, JM_WORLD, LM
integer, intent(IN) :: NX, NY
integer, optional, intent(OUT) :: rc
end function AppGridCreateF
end interface
! Get Decomposition from CF
!--------------------------
! !RESOURCE_ITEM: none :: Processing elements in 1st dimension
call MAPL_GetResource( META, NX, label ='NX:', default=1, rc = status )
VERIFY_(STATUS)
! !RESOURCE_ITEM: none :: Processing elements in 2nd dimension
call MAPL_GetResource( META, NY, label ='NY:', default=1, rc = status )
VERIFY_(STATUS)
! Get World problem size from CF
!-------------------------------
! !RESOURCE_ITEM: none :: Grid size in 1st dimension
call MAPL_GetResource( META, IM_WORLD, 'AGCM_IM:', rc = status )
VERIFY_(STATUS)
! !RESOURCE_ITEM: none :: Grid size in 2nd dimension
call MAPL_GetResource( META, JM_WORLD, 'AGCM_JM:', rc = status )
VERIFY_(STATUS)
! !RESOURCE_ITEM: none :: Grid size in 3rd dimension
call MAPL_GetResource( META, LM, 'AGCM_LM:', default=1, rc = status )
VERIFY_(STATUS)
! The grid's name is optional
!----------------------------
call GET_INT_FORMAT(IM_WORLD, FMTIM)
call GET_INT_FORMAT(JM_WORLD, FMTJM)
FMT = '(A,' // trim(FMTIM) //',A,' // trim(FMTJM) // ',A)'
write(tmpname,trim(FMT)) 'PE',IM_WORLD,'x',JM_WORLD,'-CF'
! !RESOURCE_ITEM: none :: Optional grid name
call MAPL_GetResource( META, GRIDNAME, 'AGCM.GRIDNAME:', default=trim(tmpname), rc = status )
VERIFY_(STATUS)
esmfgrid = AppGridCreateF(IM_WORLD, JM_WORLD, LM, NX, NY, STATUS)
VERIFY_(STATUS)
RETURN_(ESMF_SUCCESS)
end subroutine AppGridCreate
subroutine GET_INT_FORMAT(N, FMT)
integer :: N
character(len=*) :: FMT
IF(N < 10) THEN
FMT = 'I1'
ELSE IF (N< 100) THEN
FMT = 'I2'
ELSE IF (N< 1000) THEN
FMT = 'I3'
ELSE IF (N< 10000) THEN
FMT = 'I4'
else
FMT = 'I5'
end IF
end subroutine GET_INT_FORMAT
subroutine DecomposeDim ( dim_world,dim,NDEs )
!
! From FMS/MPP
!
implicit none
integer dim_world, NDEs
integer dim(0:NDEs-1)
integer :: is,ie,isg,ieg
integer :: ndiv,ndivs,imax,ndmax,ndmirror,n
integer :: ibegin(0:NDEs-1)
integer :: iend(0:NDEs-1)
logical :: symmetrize
logical :: even, odd
even(n) = (mod(n,2).EQ.0)
odd (n) = (mod(n,2).EQ.1)
isg = 1
ieg = dim_world
ndivs = NDEs
is = isg
n = 0
do ndiv=0,ndivs-1
!modified for mirror-symmetry
!original line
! ie = is + CEILING( float(ieg-is+1)/(ndivs-ndiv) ) - 1
!problem of dividing nx points into n domains maintaining symmetry
!i.e nx=18 n=4 4554 and 5445 are solutions but 4455 is not.
!this will always work for nx even n even or odd
!this will always work for nx odd, n odd
!this will never work for nx odd, n even: for this case we supersede the mirror calculation
! symmetrize = .NOT. ( mod(ndivs,2).EQ.0 .AND. mod(ieg-isg+1,2).EQ.1 )
!nx even n odd fails if n>nx/2
symmetrize = ( even(ndivs) .AND. even(ieg-isg+1) ) .OR. &
( odd(ndivs) .AND. odd(ieg-isg+1) ) .OR. &
( odd(ndivs) .AND. even(ieg-isg+1) .AND. ndivs.LT.(ieg-isg+1)/2 )
!mirror domains are stored in the list and retrieved if required.
if( ndiv.EQ.0 )then
!initialize max points and max domains
imax = ieg
ndmax = ndivs
end if
!do bottom half of decomposition, going over the midpoint for odd ndivs
if( ndiv.LT.(ndivs-1)/2+1 )then
!domain is sized by dividing remaining points by remaining domains
ie = is + CEILING( REAL(imax-is+1)/(ndmax-ndiv) ) - 1
ndmirror = (ndivs-1) - ndiv !mirror domain
if( ndmirror.GT.ndiv .AND. symmetrize )then !only for domains over the midpoint
!mirror extents, the max(,) is to eliminate overlaps
ibegin(ndmirror) = max( isg+ieg-ie, ie+1 )
iend(ndmirror) = max( isg+ieg-is, ie+1 )
imax = ibegin(ndmirror) - 1
ndmax = ndmax - 1
end if
else
if( symmetrize )then
!do top half of decomposition by retrieving saved values
is = ibegin(ndiv)
ie = iend(ndiv)
else
ie = is + CEILING( REAL(imax-is+1)/(ndmax-ndiv) ) - 1
end if
end if
dim(ndiv) = ie-is+1
is = ie + 1
end do
end subroutine DecomposeDim