diff --git a/src/LIB/SURCOUCHE/src/mode_io_field_write.f90 b/src/LIB/SURCOUCHE/src/mode_io_field_write.f90
index 9024c3c182009a4037b585479310001d3fb3e805..ea5ff4f74f7d7c0afb42ae47599d31f862ba8fac 100644
--- a/src/LIB/SURCOUCHE/src/mode_io_field_write.f90
+++ b/src/LIB/SURCOUCHE/src/mode_io_field_write.f90
@@ -4395,11 +4395,11 @@ SUBROUTINE IO_Fieldlist_1field_write( TPOUTPUT, KMI, TPFIELD, KBOXID, TPBOX )
USE MODD_FIELD, ONLY: TFIELDDATA, TFIELDMETADATA
USE MODD_OUT_n, ONLY: CMAINDOMAINNAME, TOUTBOXMETADATA
-TYPE(TFILEDATA), INTENT(IN) :: TPOUTPUT !Output file
-INTEGER, INTENT(IN) :: KMI
-TYPE(TFIELDDATA), INTENT(IN) :: TPFIELD
-INTEGER, INTENT(IN) :: KBOXID
-TYPE(TOUTBOXMETADATA), INTENT(IN) :: TPBOX
+TYPE(TFILEDATA), INTENT(IN) :: TPOUTPUT !Output file
+INTEGER, INTENT(IN) :: KMI
+TYPE(TFIELDDATA), INTENT(IN) :: TPFIELD
+INTEGER, INTENT(IN) :: KBOXID
+TYPE(TOUTBOXMETADATA), INTENT(INOUT) :: TPBOX
INTEGER :: IIINF, IJINF, IKINF
INTEGER :: IISUP, IJSUP, IKSUP
@@ -4662,6 +4662,8 @@ NDIMS: SELECT CASE (TPFIELD%NDIMS)
IF ( TPBOX%CNAME /= CMAINDOMAINNAME ) CALL IO_Dim_main_to_box( TZFIELDMD )
CALL IO_Dim_box_bounds( TPBOX, TZFIELDMD, KIINF=IIINF, KISUP=IISUP, KJINF=IJINF, KJSUP=IJSUP )
+
+ CALL IO_Box_coords_enable( TZFIELDMD, TPBOX )
END IF
NTYPE2D: SELECT CASE (TPFIELD%NTYPE)
@@ -4731,6 +4733,8 @@ NDIMS: SELECT CASE (TPFIELD%NDIMS)
IF ( TPBOX%CNAME /= CMAINDOMAINNAME ) CALL IO_Dim_main_to_box( TZFIELDMD )
CALL IO_Dim_box_bounds( TPBOX, TZFIELDMD, KIINF=IIINF, KISUP=IISUP, KJINF=IJINF, KJSUP=IJSUP, KKINF=IKINF, KKSUP=IKSUP )
+
+ CALL IO_Box_coords_enable( TZFIELDMD, TPBOX )
END IF
NTYPE3D: SELECT CASE (TPFIELD%NTYPE)
@@ -4804,6 +4808,8 @@ NDIMS: SELECT CASE (TPFIELD%NDIMS)
IF ( TPBOX%CNAME /= CMAINDOMAINNAME ) CALL IO_Dim_main_to_box( TZFIELDMD )
CALL IO_Dim_box_bounds( TPBOX, TZFIELDMD, KIINF=IIINF, KISUP=IISUP, KJINF=IJINF, KJSUP=IJSUP, KKINF=IKINF, KKSUP=IKSUP )
+
+ CALL IO_Box_coords_enable( TZFIELDMD, TPBOX )
END IF
NTYPE4D: SELECT CASE (TPFIELD%NTYPE)
@@ -4922,6 +4928,46 @@ END SELECT NDIMS
END SUBROUTINE IO_Fieldlist_1field_write
+SUBROUTINE IO_Box_coords_enable( TPFIELD, TPBOX )
+ ! This subroutine set to true a coordinate as soon as it is used
+ ! Once it is true, it must not be set again to false (it is to know if the coordinate has been used and has to be written)
+ USE MODD_FIELD, ONLY: TFIELDMETADATA
+ USE MODD_OUT_n, ONLY: TOUTBOXMETADATA
+
+ CLASS(TFIELDMETADATA), INTENT(IN) :: TPFIELD
+ CLASS(TOUTBOXMETADATA), INTENT(INOUT) :: TPBOX
+
+ IF ( TPFIELD%NDIMS < 2 ) RETURN
+
+ SELECT CASE( TPFIELD%NGRID )
+ CASE(1) !Mass point
+ TPBOX%LCOORD_LATM = .TRUE.
+ TPBOX%LCOORD_LONM = .TRUE.
+ CASE(2) !u point
+ TPBOX%LCOORD_LATU = .TRUE.
+ TPBOX%LCOORD_LONU = .TRUE.
+ CASE(3) !v point
+ TPBOX%LCOORD_LATV = .TRUE.
+ TPBOX%LCOORD_LONV = .TRUE.
+ CASE(4) !w point
+ TPBOX%LCOORD_LATM = .TRUE.
+ TPBOX%LCOORD_LONM = .TRUE.
+ CASE(5) !xi vorticity point (=f point =uv point)
+ TPBOX%LCOORD_LATF = .TRUE.
+ TPBOX%LCOORD_LONF = .TRUE.
+ CASE(6) !eta vorticity point (=uw point)
+ TPBOX%LCOORD_LATU = .TRUE.
+ TPBOX%LCOORD_LONU = .TRUE.
+ CASE(7) !zeta vorticity point (=vw point)
+ TPBOX%LCOORD_LATV = .TRUE.
+ TPBOX%LCOORD_LONV = .TRUE.
+ CASE(8) !fw point (=uvw point)
+ TPBOX%LCOORD_LATF = .TRUE.
+ TPBOX%LCOORD_LONF = .TRUE.
+ END SELECT
+END SUBROUTINE IO_Box_coords_enable
+
+
SUBROUTINE IO_Field_user_write( TPOUTPUT )
!
#if 0
diff --git a/src/LIB/SURCOUCHE/src/mode_io_write_nc4.f90 b/src/LIB/SURCOUCHE/src/mode_io_write_nc4.f90
index 9cc90f2f164e70e3ddb79d796de8c82c2fe98024..d5ffe3f5fa309ff87a30041beafefa1a59b2e23d 100644
--- a/src/LIB/SURCOUCHE/src/mode_io_write_nc4.f90
+++ b/src/LIB/SURCOUCHE/src/mode_io_write_nc4.f90
@@ -2677,20 +2677,20 @@ subroutine Write_box_coords( kbox, tpbox )
if ( .not. lcartesian ) then
! Mass point
- call Write_box_one_coord( tpbox, 'latitude', zlatm_glob )
- call Write_box_one_coord( tpbox, 'longitude', zlonm_glob )
+ if ( tpbox%lcoord_latm ) call Write_box_one_coord( tpbox, 'latitude', zlatm_glob )
+ if ( tpbox%lcoord_lonm ) call Write_box_one_coord( tpbox, 'longitude', zlonm_glob )
! u point
- call Write_box_one_coord( tpbox, 'latitude_u', zlatu_glob )
- call Write_box_one_coord( tpbox, 'longitude_u', zlonu_glob )
+ if ( tpbox%lcoord_latu ) call Write_box_one_coord( tpbox, 'latitude_u', zlatu_glob )
+ if ( tpbox%lcoord_lonu ) call Write_box_one_coord( tpbox, 'longitude_u', zlonu_glob )
! v point
- call Write_box_one_coord( tpbox, 'latitude_v', zlatv_glob )
- call Write_box_one_coord( tpbox, 'longitude_v', zlonv_glob )
+ if ( tpbox%lcoord_latv ) call Write_box_one_coord( tpbox, 'latitude_v', zlatv_glob )
+ if ( tpbox%lcoord_lonv ) call Write_box_one_coord( tpbox, 'longitude_v', zlonv_glob )
! xi vorticity point (=f point =uv point)
- call Write_box_one_coord( tpbox, 'latitude_f', zlatf_glob )
- call Write_box_one_coord( tpbox, 'longitude_f', zlonf_glob )
+ if ( tpbox%lcoord_latf ) call Write_box_one_coord( tpbox, 'latitude_f', zlatf_glob )
+ if ( tpbox%lcoord_lonf ) call Write_box_one_coord( tpbox, 'longitude_f', zlonf_glob )
end if
! Restore the root HDF group
diff --git a/src/MNH/modd_outn.f90 b/src/MNH/modd_outn.f90
index 583da788cc6502e95a282475b8df53a117692bbf..423b60b7cbc6fee847f41434fa5cc7a156bde7c6 100644
--- a/src/MNH/modd_outn.f90
+++ b/src/MNH/modd_outn.f90
@@ -57,6 +57,17 @@ TYPE TOUTBOXMETADATA
INTEGER :: NJSUP = NNEGUNDEF
INTEGER :: NKINF = NNEGUNDEF
INTEGER :: NKSUP = NNEGUNDEF
+
+ ! Variables to decide if some coordinates are used and are to be written
+ ! Set to true if the coordinate is necessary
+ LOGICAL :: LCOORD_LATM = .FALSE. ! Latitude at mass points
+ LOGICAL :: LCOORD_LONM = .FALSE. ! Longitude at mass points
+ LOGICAL :: LCOORD_LATU = .FALSE. ! Latitude at u points
+ LOGICAL :: LCOORD_LONU = .FALSE. ! Longitude at u points
+ LOGICAL :: LCOORD_LATV = .FALSE. ! Latitude at v points
+ LOGICAL :: LCOORD_LONV = .FALSE. ! Longitude at v points
+ LOGICAL :: LCOORD_LATF = .FALSE. ! Latitude at f points
+ LOGICAL :: LCOORD_LONF = .FALSE. ! Longitude at f points
END TYPE TOUTBOXMETADATA
TYPE OUT_t