| 1 | MODULE domngb |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE domngb *** |
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| 4 | !! Grid search: find the closest grid point from a given on/lat position |
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| 5 | !!====================================================================== |
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| 6 | !! History : 3.2 ! 2009-11 (S. Masson) Original code |
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| 7 | !!---------------------------------------------------------------------- |
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| 8 | |
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| 9 | !!---------------------------------------------------------------------- |
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| 10 | !! dom_ngb : find the closest grid point from a given lon/lat position |
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| 11 | !!---------------------------------------------------------------------- |
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| 12 | USE dom_oce ! ocean space and time domain |
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| 13 | USE lib_mpp ! for mppsum |
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| 14 | |
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| 15 | IMPLICIT NONE |
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| 16 | PRIVATE |
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| 17 | |
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| 18 | PUBLIC dom_ngb ! routine called in iom.F90 module |
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| 19 | |
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| 20 | !!---------------------------------------------------------------------- |
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| 21 | !! NEMO/OPA 3.3 , NEMO Consortium (2010) |
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| 22 | !! $Id$ |
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| 23 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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| 24 | !!---------------------------------------------------------------------- |
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| 25 | CONTAINS |
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| 26 | |
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| 27 | SUBROUTINE dom_ngb( plon, plat, kii, kjj, cdgrid ) |
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| 28 | !!---------------------------------------------------------------------- |
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| 29 | !! *** ROUTINE dom_ngb *** |
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| 30 | !! |
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| 31 | !! ** Purpose : find the closest grid point from a given lon/lat position |
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| 32 | !! |
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| 33 | !! ** Method : look for minimum distance in cylindrical projection |
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| 34 | !! -> not good if located at too high latitude... |
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| 35 | !!---------------------------------------------------------------------- |
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| 36 | USE wrk_nemo, ONLY: wrk_in_use, wrk_not_released |
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| 37 | USE wrk_nemo, ONLY: zglam => wrk_2d_2 , zgphi => wrk_2d_3 , zmask => wrk_2d_4 , zdist => wrk_2d_5 |
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| 38 | ! |
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| 39 | REAL(wp) , INTENT(in ) :: plon, plat ! longitude,latitude of the point |
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| 40 | INTEGER , INTENT( out) :: kii, kjj ! i-,j-index of the closes grid point |
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| 41 | CHARACTER(len=1), INTENT(in ) :: cdgrid ! grid name 'T', 'U', 'V', 'W' |
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| 42 | ! |
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| 43 | INTEGER , DIMENSION(2) :: iloc |
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| 44 | REAL(wp) :: zlon, zmini |
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| 45 | !!-------------------------------------------------------------------- |
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| 46 | ! |
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| 47 | IF( wrk_in_use(2, 2,3,4,5) ) CALL ctl_stop('dom_ngb: Requested workspaces already in use') |
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| 48 | ! |
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| 49 | zmask(:,:) = 0._wp |
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| 50 | SELECT CASE( cdgrid ) |
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| 51 | CASE( 'U' ) ; zglam(:,:) = glamu(:,:) ; zgphi(:,:) = gphiu(:,:) ; zmask(nldi:nlei,nldj:nlej) = umask(nldi:nlei,nldj:nlej,1) |
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| 52 | CASE( 'V' ) ; zglam(:,:) = glamv(:,:) ; zgphi(:,:) = gphiv(:,:) ; zmask(nldi:nlei,nldj:nlej) = vmask(nldi:nlei,nldj:nlej,1) |
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| 53 | CASE( 'F' ) ; zglam(:,:) = glamf(:,:) ; zgphi(:,:) = gphif(:,:) ; zmask(nldi:nlei,nldj:nlej) = fmask(nldi:nlei,nldj:nlej,1) |
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| 54 | CASE DEFAULT ; zglam(:,:) = glamt(:,:) ; zgphi(:,:) = gphit(:,:) ; zmask(nldi:nlei,nldj:nlej) = tmask(nldi:nlei,nldj:nlej,1) |
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| 55 | END SELECT |
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| 56 | |
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| 57 | zlon = MOD( plon + 720., 360. ) ! plon between 0 and 360 |
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| 58 | zglam(:,:) = MOD( zglam(:,:) + 720., 360. ) ! glam between 0 and 360 |
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| 59 | IF( zlon > 270. ) zlon = zlon - 360. ! zlon between -90 and 270 |
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| 60 | IF( zlon < 90. ) WHERE( zglam(:,:) > 180. ) zglam(:,:) = zglam(:,:) - 360. ! glam between -180 and 180 |
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| 61 | |
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| 62 | zglam(:,:) = zglam(:,:) - zlon |
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| 63 | zgphi(:,:) = zgphi(:,:) - plat |
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| 64 | zdist(:,:) = zglam(:,:) * zglam(:,:) + zgphi(:,:) * zgphi(:,:) |
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| 65 | |
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| 66 | IF( lk_mpp ) THEN |
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| 67 | CALL mpp_minloc( zdist(:,:), zmask, zmini, kii, kjj) |
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| 68 | ELSE |
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| 69 | iloc(:) = MINLOC( zdist(:,:), mask = zmask(:,:) == 1.e0 ) |
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| 70 | kii = iloc(1) + nimpp - 1 |
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| 71 | kjj = iloc(2) + njmpp - 1 |
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| 72 | ENDIF |
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| 73 | ! |
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| 74 | IF( wrk_not_released(2, 2,3,4,5) ) CALL ctl_stop('dom_ngb: error releasing workspaces') |
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| 75 | ! |
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| 76 | END SUBROUTINE dom_ngb |
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| 77 | |
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| 78 | !!====================================================================== |
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| 79 | END MODULE domngb |
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