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 phycst |
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14 | ! |
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15 | USE in_out_manager ! I/O manager |
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16 | USE lib_mpp ! for mppsum |
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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 and domclo.F90 module |
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22 | PUBLIC dist |
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23 | |
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24 | !!---------------------------------------------------------------------- |
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25 | !! NEMO/OCE 4.0 , NEMO Consortium (2018) |
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26 | !! $Id: domngb.F90 10425 2018-12-19 21:54:16Z smasson $ |
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27 | !! Software governed by the CeCILL license (see ./LICENSE) |
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28 | !!---------------------------------------------------------------------- |
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29 | CONTAINS |
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30 | |
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31 | SUBROUTINE dom_ngb( plon, plat, kii, kjj, rdist, cdgrid, kkk ) |
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32 | !!---------------------------------------------------------------------- |
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33 | !! *** ROUTINE dom_ngb *** |
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34 | !! |
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35 | !! ** Purpose : find the closest grid point from a given lon/lat position |
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36 | !! |
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37 | !! ** Method : look for minimum distance in cylindrical projection |
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38 | !! -> not good if located at too high latitude... |
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39 | !!---------------------------------------------------------------------- |
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40 | REAL(wp) , INTENT(in ) :: plon, plat ! longitude,latitude of the point |
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41 | REAL(wp) , INTENT( out) :: rdist ! distance between the located point and the source |
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42 | INTEGER , INTENT( out) :: kii, kjj ! i-,j-index of the closes grid point |
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43 | INTEGER , INTENT(in ), OPTIONAL :: kkk ! k-index of the mask level used |
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44 | CHARACTER(len=1), INTENT(in ) :: cdgrid ! grid name 'T', 'U', 'V', 'W' |
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45 | ! |
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46 | INTEGER :: ik ! working level |
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47 | INTEGER , DIMENSION(2) :: iloc |
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48 | REAL(wp), DIMENSION(jpi,jpj) :: zglam, zgphi, zmask, zdist |
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49 | !!-------------------------------------------------------------------- |
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50 | ! |
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51 | zmask(:,:) = 0._wp |
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52 | ik = 1 |
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53 | IF ( PRESENT(kkk) ) ik=kkk |
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54 | SELECT CASE( cdgrid ) |
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55 | CASE( 'U' ) ; zglam(:,:) = glamu(:,:) ; zgphi(:,:) = gphiu(:,:) ; zmask(nldi:nlei,nldj:nlej) = umask(nldi:nlei,nldj:nlej,ik) |
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56 | CASE( 'V' ) ; zglam(:,:) = glamv(:,:) ; zgphi(:,:) = gphiv(:,:) ; zmask(nldi:nlei,nldj:nlej) = vmask(nldi:nlei,nldj:nlej,ik) |
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57 | CASE( 'F' ) ; zglam(:,:) = glamf(:,:) ; zgphi(:,:) = gphif(:,:) ; zmask(nldi:nlei,nldj:nlej) = fmask(nldi:nlei,nldj:nlej,ik) |
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58 | CASE DEFAULT ; zglam(:,:) = glamt(:,:) ; zgphi(:,:) = gphit(:,:) ; zmask(nldi:nlei,nldj:nlej) = tmask(nldi:nlei,nldj:nlej,ik) |
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59 | END SELECT |
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60 | |
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61 | zdist = dist(plon, plat, zglam, zgphi) |
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62 | |
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63 | IF( lk_mpp ) THEN |
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64 | CALL mpp_minloc( 'domngb', zdist(:,:), zmask, rdist, iloc) |
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65 | kii = iloc(1) ; kjj = iloc(2) |
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66 | ELSE |
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67 | iloc(:) = MINLOC( zdist(:,:), mask = zmask(:,:) == 1.e0 ) |
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68 | rdist = MINVAL( zdist(:,:) ) |
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69 | kii = iloc(1) + nimpp - 1 |
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70 | kjj = iloc(2) + njmpp - 1 |
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71 | ENDIF |
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72 | ! |
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73 | END SUBROUTINE dom_ngb |
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74 | |
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75 | FUNCTION dist(plonsrc, platsrc, plontrg, plattrg) |
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76 | REAL(wp), INTENT(in) :: plonsrc, platsrc ! lat/lon of the source point |
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77 | REAL(wp), DIMENSION(jpi,jpj), INTENT(in) :: plontrg, plattrg ! lat/lon of the target (2d in this case) |
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78 | |
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79 | REAL(wp) :: zxs, zys, zzs |
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80 | REAL(wp), DIMENSION(jpi,jpj) :: zxt, zyt, zzt |
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81 | |
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82 | REAL(wp), DIMENSION(jpi,jpj) :: dist ! distance between src and trg |
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83 | |
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84 | zxs = COS( rad * platsrc ) * COS( rad * plonsrc ) |
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85 | zys = COS( rad * platsrc ) * SIN( rad * plonsrc ) |
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86 | zzs = SIN( rad * platsrc ) |
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87 | |
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88 | zxt = COS( rad * plattrg ) * COS( rad * plontrg ) |
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89 | zyt = COS( rad * plattrg ) * SIN( rad * plontrg ) |
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90 | zzt = SIN( rad * plattrg ) |
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91 | |
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92 | dist(:,:) = ( zxs - zxt(:,:) )**2 & |
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93 | & + ( zys - zyt(:,:) )**2 & |
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94 | & + ( zzs - zzt(:,:) )**2 |
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95 | |
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96 | dist(:,:) = ra * SQRT( dist(:,:) ) |
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97 | |
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98 | END FUNCTION dist |
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99 | |
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100 | !!====================================================================== |
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101 | END MODULE domngb |
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