| 1 | ! |
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| 2 | ! $Id$ |
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| 3 | ! |
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| 4 | module inter_barxy_m |
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| 5 | |
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| 6 | ! Authors: Robert SADOURNY, Phu LE VAN, Lionel GUEZ |
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| 7 | |
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| 8 | implicit none |
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| 9 | |
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| 10 | private |
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| 11 | public inter_barxy |
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| 12 | |
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| 13 | contains |
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| 14 | |
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| 15 | SUBROUTINE inter_barxy(dlonid, dlatid, champ, rlonimod, rlatimod, champint) |
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| 16 | |
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| 17 | use assert_eq_m, only: assert_eq |
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| 18 | use assert_m, only: assert |
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| 19 | |
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| 20 | include "dimensions.h" |
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| 21 | ! (for "iim", "jjm") |
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| 22 | |
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| 23 | include "paramet.h" |
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| 24 | ! (for other included files) |
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| 25 | |
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| 26 | include "comgeom2.h" |
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| 27 | ! (for "aire", "apoln", "apols") |
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| 28 | |
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| 29 | REAL, intent(in):: dlonid(:) |
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| 30 | ! (longitude from input file, in rad, from -pi to pi) |
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| 31 | |
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| 32 | REAL, intent(in):: dlatid(:), champ(:, :), rlonimod(:) |
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| 33 | |
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| 34 | REAL, intent(in):: rlatimod(:) |
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| 35 | ! (latitude angle, in degrees or rad, in strictly decreasing order) |
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| 36 | |
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| 37 | real, intent(out):: champint(:, :) |
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| 38 | ! Si taille de la seconde dim = jjm + 1, on veut interpoler sur les |
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| 39 | ! jjm+1 latitudes rlatu du modele (latitudes des scalaires et de U) |
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| 40 | ! Si taille de la seconde dim = jjm, on veut interpoler sur les |
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| 41 | ! jjm latitudes rlatv du modele (latitudes de V) |
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| 42 | |
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| 43 | ! Variables local to the procedure: |
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| 44 | |
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| 45 | REAL champy(iim, size(champ, 2)) |
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| 46 | integer j, i, jnterfd, jmods |
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| 47 | |
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| 48 | REAL yjmod(size(champint, 2)) |
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| 49 | ! (angle, in degrees, in strictly increasing order) |
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| 50 | |
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| 51 | REAL yjdat(size(dlatid) + 1) ! angle, in degrees, in increasing order |
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| 52 | LOGICAL decrois ! "dlatid" is in decreasing order |
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| 53 | |
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| 54 | !----------------------------------- |
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| 55 | |
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| 56 | jnterfd = assert_eq(size(champ, 2) - 1, size(dlatid), & |
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| 57 | "inter_barxy jnterfd") |
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| 58 | jmods = size(champint, 2) |
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| 59 | call assert(size(champ, 1) == size(dlonid), "inter_barxy size(champ, 1)") |
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| 60 | call assert((/size(rlonimod), size(champint, 1)/) == iim, & |
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| 61 | "inter_barxy iim") |
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| 62 | call assert(any(jmods == (/jjm, jjm + 1/)), 'inter_barxy jmods') |
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| 63 | call assert(size(rlatimod) == jjm, "inter_barxy size(rlatimod)") |
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| 64 | |
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| 65 | ! Check decreasing order for "rlatimod": |
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| 66 | DO i = 2, jjm |
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| 67 | IF (rlatimod(i) >= rlatimod(i-1)) stop & |
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| 68 | '"inter_barxy": "rlatimod" should be strictly decreasing' |
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| 69 | ENDDO |
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| 70 | |
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| 71 | yjmod(:jjm) = ord_coordm(rlatimod) |
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| 72 | IF (jmods == jjm + 1) THEN |
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| 73 | IF (90. - yjmod(jjm) < 0.01) stop & |
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| 74 | '"inter_barxy": with jmods = jjm + 1, yjmod(jjm) should be < 90.' |
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| 75 | ELSE |
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| 76 | ! jmods = jjm |
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| 77 | IF (ABS(yjmod(jjm) - 90.) > 0.01) stop & |
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| 78 | '"inter_barxy": with jmods = jjm, yjmod(jjm) should be 90.' |
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| 79 | ENDIF |
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| 80 | |
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| 81 | if (jmods == jjm + 1) yjmod(jjm + 1) = 90. |
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| 82 | |
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| 83 | DO j = 1, jnterfd + 1 |
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| 84 | champy(:, j) = inter_barx(dlonid, champ(:, j), rlonimod) |
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| 85 | ENDDO |
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| 86 | |
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| 87 | CALL ord_coord(dlatid, yjdat, decrois) |
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| 88 | IF (decrois) champy(:, :) = champy(:, jnterfd + 1:1:-1) |
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| 89 | DO i = 1, iim |
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| 90 | champint(i, :) = inter_bary(yjdat, champy(i, :), yjmod) |
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| 91 | ENDDO |
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| 92 | champint(:, :) = champint(:, jmods:1:-1) |
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| 93 | |
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| 94 | IF (jmods == jjm + 1) THEN |
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| 95 | ! Valeurs uniques aux poles |
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| 96 | champint(:, 1) = SUM(aire(:iim, 1) * champint(:, 1)) / apoln |
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| 97 | champint(:, jjm + 1) = SUM(aire(:iim, jjm + 1) & |
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| 98 | * champint(:, jjm + 1)) / apols |
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| 99 | ENDIF |
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| 100 | |
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| 101 | END SUBROUTINE inter_barxy |
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| 102 | |
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| 103 | !****************************** |
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| 104 | |
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| 105 | function inter_barx(dlonid, fdat, rlonimod) |
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| 106 | |
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| 107 | ! INTERPOLATION BARYCENTRIQUE BASEE SUR LES AIRES |
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| 108 | ! VERSION UNIDIMENSIONNELLE , EN LONGITUDE . |
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| 109 | |
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| 110 | ! idat : indice du champ de donnees, de 1 a idatmax |
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| 111 | ! imod : indice du champ du modele, de 1 a imodmax |
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| 112 | ! fdat(idat) : champ de donnees (entrees) |
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| 113 | ! inter_barx(imod) : champ du modele (sorties) |
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| 114 | ! dlonid(idat): abscisses des interfaces des mailles donnees |
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| 115 | ! rlonimod(imod): abscisses des interfaces des mailles modele |
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| 116 | ! ( L'indice 1 correspond a l'interface mailLE 1 / maille 2) |
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| 117 | ! ( Les abscisses sont exprimees en degres) |
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| 118 | |
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| 119 | use assert_eq_m, only: assert_eq |
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| 120 | |
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| 121 | IMPLICIT NONE |
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| 122 | |
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| 123 | REAL, intent(in):: dlonid(:) |
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| 124 | real, intent(in):: fdat(:) |
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| 125 | real, intent(in):: rlonimod(:) |
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| 126 | |
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| 127 | real inter_barx(size(rlonimod)) |
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| 128 | |
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| 129 | ! ... Variables locales ... |
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| 130 | |
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| 131 | INTEGER idatmax, imodmax |
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| 132 | REAL xxid(size(dlonid)+1), xxd(size(dlonid)+1), fdd(size(dlonid)+1) |
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| 133 | REAL fxd(size(dlonid)+1), xchan(size(dlonid)+1), fdchan(size(dlonid)+1) |
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| 134 | REAL xxim(size(rlonimod)) |
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| 135 | |
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| 136 | REAL x0, xim0, dx, dxm |
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| 137 | REAL chmin, chmax, pi |
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| 138 | |
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| 139 | INTEGER imod, idat, i, ichang, id0, id1, nid, idatmax1 |
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| 140 | |
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| 141 | !----------------------------------------------------- |
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| 142 | |
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| 143 | idatmax = assert_eq(size(dlonid), size(fdat), "inter_barx idatmax") |
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| 144 | imodmax = size(rlonimod) |
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| 145 | |
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| 146 | pi = 2. * ASIN(1.) |
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| 147 | |
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| 148 | ! REDEFINITION DE L'ORIGINE DES ABSCISSES |
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| 149 | ! A L'INTERFACE OUEST DE LA PREMIERE MAILLE DU MODELE |
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| 150 | DO imod = 1, imodmax |
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| 151 | xxim(imod) = rlonimod(imod) |
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| 152 | ENDDO |
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| 153 | |
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| 154 | CALL minmax( imodmax, xxim, chmin, chmax) |
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| 155 | IF( chmax.LT.6.50 ) THEN |
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| 156 | DO imod = 1, imodmax |
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| 157 | xxim(imod) = xxim(imod) * 180./pi |
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| 158 | ENDDO |
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| 159 | ENDIF |
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| 160 | |
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| 161 | xim0 = xxim(imodmax) - 360. |
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| 162 | |
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| 163 | DO imod = 1, imodmax |
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| 164 | xxim(imod) = xxim(imod) - xim0 |
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| 165 | ENDDO |
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| 166 | |
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| 167 | idatmax1 = idatmax +1 |
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| 168 | |
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| 169 | DO idat = 1, idatmax |
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| 170 | xxd(idat) = dlonid(idat) |
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| 171 | ENDDO |
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| 172 | |
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| 173 | CALL minmax( idatmax, xxd, chmin, chmax) |
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| 174 | IF( chmax.LT.6.50 ) THEN |
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| 175 | DO idat = 1, idatmax |
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| 176 | xxd(idat) = xxd(idat) * 180./pi |
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| 177 | ENDDO |
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| 178 | ENDIF |
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| 179 | |
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| 180 | DO idat = 1, idatmax |
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| 181 | xxd(idat) = AMOD( xxd(idat) - xim0, 360. ) |
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| 182 | fdd(idat) = fdat (idat) |
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| 183 | ENDDO |
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| 184 | |
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| 185 | i = 2 |
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| 186 | DO while (xxd(i) >= xxd(i-1) .and. i < idatmax) |
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| 187 | i = i + 1 |
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| 188 | ENDDO |
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| 189 | IF (xxd(i) < xxd(i-1)) THEN |
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| 190 | ichang = i |
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| 191 | ! *** reorganisation des longitudes entre 0. et 360. degres **** |
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| 192 | nid = idatmax - ichang +1 |
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| 193 | DO i = 1, nid |
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| 194 | xchan (i) = xxd(i+ichang -1 ) |
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| 195 | fdchan(i) = fdd(i+ichang -1 ) |
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| 196 | ENDDO |
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| 197 | DO i=1, ichang -1 |
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| 198 | xchan (i+ nid) = xxd(i) |
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| 199 | fdchan(i+nid) = fdd(i) |
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| 200 | ENDDO |
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| 201 | DO i =1, idatmax |
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| 202 | xxd(i) = xchan(i) |
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| 203 | fdd(i) = fdchan(i) |
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| 204 | ENDDO |
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| 205 | end IF |
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| 206 | |
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| 207 | ! translation des champs de donnees par rapport |
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| 208 | ! a la nouvelle origine, avec redondance de la |
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| 209 | ! maille a cheval sur les bords |
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| 210 | |
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| 211 | id0 = 0 |
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| 212 | id1 = 0 |
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| 213 | |
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| 214 | DO idat = 1, idatmax |
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| 215 | IF ( xxd( idatmax1- idat ).LT.360.) exit |
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| 216 | id1 = id1 + 1 |
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| 217 | ENDDO |
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| 218 | |
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| 219 | DO idat = 1, idatmax |
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| 220 | IF (xxd(idat).GT.0.) exit |
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| 221 | id0 = id0 + 1 |
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| 222 | END DO |
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| 223 | |
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| 224 | IF( id1 /= 0 ) then |
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| 225 | DO idat = 1, id1 |
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| 226 | xxid(idat) = xxd(idatmax - id1 + idat) - 360. |
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| 227 | fxd (idat) = fdd(idatmax - id1 + idat) |
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| 228 | END DO |
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| 229 | DO idat = 1, idatmax - id1 |
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| 230 | xxid(idat + id1) = xxd(idat) |
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| 231 | fxd (idat + id1) = fdd(idat) |
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| 232 | END DO |
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| 233 | end IF |
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| 234 | |
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| 235 | IF(id0 /= 0) then |
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| 236 | DO idat = 1, idatmax - id0 |
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| 237 | xxid(idat) = xxd(idat + id0) |
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| 238 | fxd (idat) = fdd(idat + id0) |
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| 239 | END DO |
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| 240 | |
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| 241 | DO idat = 1, id0 |
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| 242 | xxid (idatmax - id0 + idat) = xxd(idat) + 360. |
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| 243 | fxd (idatmax - id0 + idat) = fdd(idat) |
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| 244 | END DO |
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| 245 | else |
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| 246 | DO idat = 1, idatmax |
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| 247 | xxid(idat) = xxd(idat) |
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| 248 | fxd (idat) = fdd(idat) |
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| 249 | ENDDO |
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| 250 | end IF |
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| 251 | xxid(idatmax1) = xxid(1) + 360. |
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| 252 | fxd (idatmax1) = fxd(1) |
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| 253 | |
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| 254 | ! initialisation du champ du modele |
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| 255 | |
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| 256 | inter_barx(:) = 0. |
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| 257 | |
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| 258 | ! iteration |
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| 259 | |
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| 260 | x0 = xim0 |
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| 261 | dxm = 0. |
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| 262 | imod = 1 |
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| 263 | idat = 1 |
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| 264 | |
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| 265 | do while (imod <= imodmax) |
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| 266 | do while (xxim(imod).GT.xxid(idat)) |
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| 267 | dx = xxid(idat) - x0 |
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| 268 | dxm = dxm + dx |
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| 269 | inter_barx(imod) = inter_barx(imod) + dx * fxd(idat) |
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| 270 | x0 = xxid(idat) |
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| 271 | idat = idat + 1 |
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| 272 | end do |
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| 273 | IF (xxim(imod).LT.xxid(idat)) THEN |
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| 274 | dx = xxim(imod) - x0 |
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| 275 | dxm = dxm + dx |
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| 276 | inter_barx(imod) = (inter_barx(imod) + dx * fxd(idat)) / dxm |
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| 277 | x0 = xxim(imod) |
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| 278 | dxm = 0. |
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| 279 | imod = imod + 1 |
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| 280 | ELSE |
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| 281 | dx = xxim(imod) - x0 |
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| 282 | dxm = dxm + dx |
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| 283 | inter_barx(imod) = (inter_barx(imod) + dx * fxd(idat)) / dxm |
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| 284 | x0 = xxim(imod) |
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| 285 | dxm = 0. |
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| 286 | imod = imod + 1 |
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| 287 | idat = idat + 1 |
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| 288 | END IF |
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| 289 | end do |
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| 290 | |
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| 291 | END function inter_barx |
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| 292 | |
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| 293 | !****************************** |
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| 294 | |
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| 295 | function inter_bary(yjdat, fdat, yjmod) |
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| 296 | |
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| 297 | ! Interpolation barycentrique basée sur les aires. |
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| 298 | ! Version unidimensionnelle, en latitude. |
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| 299 | ! L'indice 1 correspond à l'interface maille 1 -- maille 2. |
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| 300 | |
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| 301 | use assert_m, only: assert |
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| 302 | |
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| 303 | IMPLICIT NONE |
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| 304 | |
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| 305 | REAL, intent(in):: yjdat(:) |
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| 306 | ! (angles, ordonnées des interfaces des mailles des données, in |
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| 307 | ! degrees, in increasing order) |
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| 308 | |
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| 309 | REAL, intent(in):: fdat(:) ! champ de données |
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| 310 | |
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| 311 | REAL, intent(in):: yjmod(:) |
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| 312 | ! (ordonnées des interfaces des mailles du modèle) |
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| 313 | ! (in degrees, in strictly increasing order) |
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| 314 | |
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| 315 | REAL inter_bary(size(yjmod)) ! champ du modèle |
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| 316 | |
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| 317 | ! Variables local to the procedure: |
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| 318 | |
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| 319 | REAL y0, dy, dym |
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| 320 | INTEGER jdat ! indice du champ de données |
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| 321 | integer jmod ! indice du champ du modèle |
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| 322 | |
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| 323 | !------------------------------------ |
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| 324 | |
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| 325 | call assert(size(yjdat) == size(fdat), "inter_bary") |
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| 326 | |
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| 327 | ! Initialisation des variables |
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| 328 | inter_bary(:) = 0. |
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| 329 | y0 = -90. |
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| 330 | dym = 0. |
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| 331 | jmod = 1 |
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| 332 | jdat = 1 |
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| 333 | |
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| 334 | do while (jmod <= size(yjmod)) |
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| 335 | do while (yjmod(jmod) > yjdat(jdat)) |
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| 336 | dy = yjdat(jdat) - y0 |
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| 337 | dym = dym + dy |
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| 338 | inter_bary(jmod) = inter_bary(jmod) + dy * fdat(jdat) |
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| 339 | y0 = yjdat(jdat) |
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| 340 | jdat = jdat + 1 |
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| 341 | end do |
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| 342 | IF (yjmod(jmod) < yjdat(jdat)) THEN |
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| 343 | dy = yjmod(jmod) - y0 |
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| 344 | dym = dym + dy |
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| 345 | inter_bary(jmod) = (inter_bary(jmod) + dy * fdat(jdat)) / dym |
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| 346 | y0 = yjmod(jmod) |
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| 347 | dym = 0. |
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| 348 | jmod = jmod + 1 |
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| 349 | ELSE |
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| 350 | ! {yjmod(jmod) == yjdat(jdat)} |
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| 351 | dy = yjmod(jmod) - y0 |
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| 352 | dym = dym + dy |
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| 353 | inter_bary(jmod) = (inter_bary(jmod) + dy * fdat(jdat)) / dym |
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| 354 | y0 = yjmod(jmod) |
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| 355 | dym = 0. |
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| 356 | jmod = jmod + 1 |
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| 357 | jdat = jdat + 1 |
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| 358 | END IF |
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| 359 | end do |
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| 360 | ! Le test de fin suppose que l'interface 0 est commune aux deux |
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| 361 | ! grilles "yjdat" et "yjmod". |
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| 362 | |
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| 363 | END function inter_bary |
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| 364 | |
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| 365 | !****************************** |
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| 366 | |
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| 367 | SUBROUTINE ord_coord(xi, xo, decrois) |
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| 368 | |
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| 369 | ! This procedure receives an array of latitudes. |
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| 370 | ! It converts them to degrees if they are in radians. |
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| 371 | ! If the input latitudes are in decreasing order, the procedure |
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| 372 | ! reverses their order. |
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| 373 | ! Finally, the procedure adds 90° as the last value of the array. |
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| 374 | |
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| 375 | use assert_eq_m, only: assert_eq |
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| 376 | |
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| 377 | IMPLICIT NONE |
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| 378 | |
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| 379 | include "comconst.h" |
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| 380 | ! (for "pi") |
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| 381 | |
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| 382 | REAL, intent(in):: xi(:) |
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| 383 | ! (latitude, in degrees or radians, in increasing or decreasing order) |
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| 384 | ! ("xi" should contain latitudes from pole to pole. |
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| 385 | ! "xi" should contain the latitudes of the boundaries of grid |
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| 386 | ! cells, not the centers of grid cells. |
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| 387 | ! So the extreme values should not be 90° and -90°.) |
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| 388 | |
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| 389 | REAL, intent(out):: xo(:) ! angles in degrees |
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| 390 | LOGICAL, intent(out):: decrois |
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| 391 | |
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| 392 | ! Variables local to the procedure: |
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| 393 | INTEGER nmax, i |
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| 394 | |
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| 395 | !-------------------- |
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| 396 | |
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| 397 | nmax = assert_eq(size(xi), size(xo) - 1, "ord_coord") |
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| 398 | |
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| 399 | ! Check monotonicity: |
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| 400 | decrois = xi(2) < xi(1) |
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| 401 | DO i = 3, nmax |
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| 402 | IF (decrois .neqv. xi(i) < xi(i-1)) stop & |
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| 403 | '"ord_coord": latitudes are not monotonic' |
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| 404 | ENDDO |
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| 405 | |
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| 406 | IF (abs(xi(1)) < pi) then |
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| 407 | ! "xi" contains latitudes in radians |
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| 408 | xo(:nmax) = xi(:) * 180. / pi |
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| 409 | else |
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| 410 | ! "xi" contains latitudes in degrees |
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| 411 | xo(:nmax) = xi(:) |
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| 412 | end IF |
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| 413 | |
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| 414 | IF (ABS(abs(xo(1)) - 90) < 0.001 .or. ABS(abs(xo(nmax)) - 90) < 0.001) THEN |
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| 415 | print *, "ord_coord" |
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| 416 | PRINT *, '"xi" should contain the latitudes of the boundaries of ' & |
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| 417 | // 'grid cells, not the centers of grid cells.' |
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| 418 | STOP |
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| 419 | ENDIF |
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| 420 | |
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| 421 | IF (decrois) xo(:nmax) = xo(nmax:1:- 1) |
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| 422 | xo(nmax + 1) = 90. |
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| 423 | |
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| 424 | END SUBROUTINE ord_coord |
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| 425 | |
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| 426 | !*********************************** |
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| 427 | |
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| 428 | function ord_coordm(xi) |
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| 429 | |
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| 430 | ! This procedure converts to degrees, if necessary, and inverts the |
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| 431 | ! order. |
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| 432 | |
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| 433 | IMPLICIT NONE |
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| 434 | |
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| 435 | include "comconst.h" |
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| 436 | ! (for "pi") |
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| 437 | |
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| 438 | REAL, intent(in):: xi(:) ! angle, in rad or degrees |
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| 439 | REAL ord_coordm(size(xi)) ! angle, in degrees |
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| 440 | |
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| 441 | !----------------------------- |
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| 442 | |
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| 443 | IF (xi(1) < 6.5) THEN |
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| 444 | ! "xi" is in rad |
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| 445 | ord_coordm(:) = xi(size(xi):1:-1) * 180. / pi |
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| 446 | else |
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| 447 | ! "xi" is in degrees |
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| 448 | ord_coordm(:) = xi(size(xi):1:-1) |
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| 449 | ENDIF |
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| 450 | |
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| 451 | END function ord_coordm |
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| 452 | |
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| 453 | end module inter_barxy_m |
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