| [1725] | 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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| [2715] | 10 | !! dom_ngb : find the closest grid point from a given lon/lat position |
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| [1725] | 11 | !!---------------------------------------------------------------------- |
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| [2715] | 12 | USE dom_oce ! ocean space and time domain |
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| [3294] | 13 | USE in_out_manager ! I/O manager |
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| [2715] | 14 | USE lib_mpp ! for mppsum |
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| [3294] | 15 | USE timing ! Timing |
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| [1725] | 16 | |
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| 17 | IMPLICIT NONE |
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| 18 | PRIVATE |
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| 19 | |
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| [2715] | 20 | PUBLIC dom_ngb ! routine called in iom.F90 module |
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| [1725] | 21 | |
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| 22 | !!---------------------------------------------------------------------- |
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| [2528] | 23 | !! NEMO/OPA 3.3 , NEMO Consortium (2010) |
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| [1725] | 24 | !! $Id$ |
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| [2715] | 25 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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| [1725] | 26 | !!---------------------------------------------------------------------- |
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| 27 | CONTAINS |
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| 28 | |
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| [6140] | 29 | SUBROUTINE dom_ngb( plon, plat, kii, kjj, cdgrid, kkk ) |
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| [1725] | 30 | !!---------------------------------------------------------------------- |
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| 31 | !! *** ROUTINE dom_ngb *** |
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| 32 | !! |
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| [2715] | 33 | !! ** Purpose : find the closest grid point from a given lon/lat position |
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| [1725] | 34 | !! |
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| 35 | !! ** Method : look for minimum distance in cylindrical projection |
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| 36 | !! -> not good if located at too high latitude... |
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| 37 | !!---------------------------------------------------------------------- |
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| 38 | REAL(wp) , INTENT(in ) :: plon, plat ! longitude,latitude of the point |
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| 39 | INTEGER , INTENT( out) :: kii, kjj ! i-,j-index of the closes grid point |
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| [6140] | 40 | INTEGER , INTENT(in ), OPTIONAL :: kkk ! k-index of the mask level used |
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| [1725] | 41 | CHARACTER(len=1), INTENT(in ) :: cdgrid ! grid name 'T', 'U', 'V', 'W' |
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| [2715] | 42 | ! |
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| [6140] | 43 | INTEGER :: ik ! working level |
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| [2715] | 44 | INTEGER , DIMENSION(2) :: iloc |
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| 45 | REAL(wp) :: zlon, zmini |
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| [7910] | 46 | REAL(wp), DIMENSION(jpi,jpj) :: zglam, zgphi, zmask, zdist |
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| [1725] | 47 | !!-------------------------------------------------------------------- |
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| [2715] | 48 | ! |
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| [3294] | 49 | IF( nn_timing == 1 ) CALL timing_start('dom_ngb') |
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| [2715] | 50 | ! |
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| [3294] | 51 | ! |
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| [2715] | 52 | zmask(:,:) = 0._wp |
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| [6140] | 53 | ik = 1 |
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| 54 | IF ( PRESENT(kkk) ) ik=kkk |
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| [1725] | 55 | SELECT CASE( cdgrid ) |
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| [6140] | 56 | CASE( 'U' ) ; zglam(:,:) = glamu(:,:) ; zgphi(:,:) = gphiu(:,:) ; zmask(nldi:nlei,nldj:nlej) = umask(nldi:nlei,nldj:nlej,ik) |
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| 57 | CASE( 'V' ) ; zglam(:,:) = glamv(:,:) ; zgphi(:,:) = gphiv(:,:) ; zmask(nldi:nlei,nldj:nlej) = vmask(nldi:nlei,nldj:nlej,ik) |
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| 58 | CASE( 'F' ) ; zglam(:,:) = glamf(:,:) ; zgphi(:,:) = gphif(:,:) ; zmask(nldi:nlei,nldj:nlej) = fmask(nldi:nlei,nldj:nlej,ik) |
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| 59 | CASE DEFAULT ; zglam(:,:) = glamt(:,:) ; zgphi(:,:) = gphit(:,:) ; zmask(nldi:nlei,nldj:nlej) = tmask(nldi:nlei,nldj:nlej,ik) |
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| [1725] | 60 | END SELECT |
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| 61 | |
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| [7646] | 62 | zlon = MOD( plon + 720., 360. ) ! plon between 0 and 360 |
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| 63 | zglam(:,:) = MOD( zglam(:,:) + 720., 360. ) ! glam between 0 and 360 |
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| 64 | IF( zlon > 270. ) zlon = zlon - 360. ! zlon between -90 and 270 |
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| 65 | IF( zlon < 90. ) WHERE( zglam(:,:) > 180. ) zglam(:,:) = zglam(:,:) - 360. ! glam between -180 and 180 |
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| 66 | zglam(:,:) = zglam(:,:) - zlon |
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| [1725] | 67 | |
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| 68 | zgphi(:,:) = zgphi(:,:) - plat |
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| 69 | zdist(:,:) = zglam(:,:) * zglam(:,:) + zgphi(:,:) * zgphi(:,:) |
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| 70 | |
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| 71 | IF( lk_mpp ) THEN |
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| 72 | CALL mpp_minloc( zdist(:,:), zmask, zmini, kii, kjj) |
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| 73 | ELSE |
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| 74 | iloc(:) = MINLOC( zdist(:,:), mask = zmask(:,:) == 1.e0 ) |
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| 75 | kii = iloc(1) + nimpp - 1 |
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| 76 | kjj = iloc(2) + njmpp - 1 |
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| 77 | ENDIF |
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| [2715] | 78 | ! |
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| 79 | ! |
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| [3294] | 80 | IF( nn_timing == 1 ) CALL timing_stop('dom_ngb') |
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| 81 | ! |
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| [1725] | 82 | END SUBROUTINE dom_ngb |
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| 83 | |
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| 84 | !!====================================================================== |
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| 85 | END MODULE domngb |
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