| 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 | ! |
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| 14 | USE in_out_manager ! I/O manager |
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| 15 | USE lib_mpp ! for mppsum |
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| 16 | USE timing ! Timing |
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| 17 | |
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| 18 | IMPLICIT NONE |
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| 19 | PRIVATE |
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| 20 | |
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| 21 | PUBLIC dom_ngb ! routine called in iom.F90 module |
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| 22 | |
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| 23 | !!---------------------------------------------------------------------- |
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| 24 | !! NEMO/OPA 3.3 , NEMO Consortium (2010) |
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| 25 | !! $Id$ |
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| 26 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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| 27 | !!---------------------------------------------------------------------- |
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| 28 | CONTAINS |
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| 29 | |
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| 30 | SUBROUTINE dom_ngb( plon, plat, kii, kjj, cdgrid, kkk ) |
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| 31 | !!---------------------------------------------------------------------- |
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| 32 | !! *** ROUTINE dom_ngb *** |
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| 33 | !! |
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| 34 | !! ** Purpose : find the closest grid point from a given lon/lat position |
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| 35 | !! |
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| 36 | !! ** Method : look for minimum distance in cylindrical projection |
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| 37 | !! -> not good if located at too high latitude... |
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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 | INTEGER , INTENT(in ), OPTIONAL :: kkk ! k-index of the mask level used |
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| 42 | CHARACTER(len=1), INTENT(in ) :: cdgrid ! grid name 'T', 'U', 'V', 'W' |
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| 43 | ! |
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| 44 | INTEGER :: ik ! working level |
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| 45 | INTEGER , DIMENSION(2) :: iloc |
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| 46 | REAL(wp) :: zlon, zmini |
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| 47 | REAL(wp), DIMENSION(jpi,jpj) :: zglam, zgphi, zmask, zdist |
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| 48 | !!-------------------------------------------------------------------- |
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| 49 | ! |
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| 50 | IF( ln_timing ) CALL timing_start('dom_ngb') |
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| 51 | ! |
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| 52 | zmask(:,:) = 0._wp |
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| 53 | ik = 1 |
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| 54 | IF ( PRESENT(kkk) ) ik=kkk |
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| 55 | SELECT CASE( cdgrid ) |
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| 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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| 60 | END SELECT |
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| 61 | |
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| 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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| 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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| 78 | ! |
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| 79 | IF( ln_timing ) CALL timing_stop('dom_ngb') |
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| 80 | ! |
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| 81 | END SUBROUTINE dom_ngb |
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| 82 | |
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| 83 | !!====================================================================== |
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| 84 | END MODULE domngb |
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