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module grille_m_m |
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! From grid_atob.F, v 1.1.1.1, 2004/05/19 12:53:05 |
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IMPLICIT none |
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|
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contains |
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function grille_m(xdata, ydata, entree, x, y) |
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! Z. X. Li (1er avril 1994) (voir aussi A. Harzallah et L. Fairhead) |
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|
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! M\'ethode na\"ive pour transformer un champ d'une grille fine \`a une |
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! grille grossi\`ere. Je consid\`ere que les nouveaux points occupent |
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! une zone adjacente qui comprend un ou plusieurs anciens points. |
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|
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! Aucune pond\'eration n'est consid\'er\'ee (voir |
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! grille_p). Cf. grille_m.txt. |
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|
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use dist_sphe_m, only: dist_sphe |
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use nr_util, only: assert_eq |
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|
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! Coordonn\'ees : |
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REAL, intent(in):: xdata(:) ! (imdep) |
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REAL, intent(in):: ydata(:) ! (jmdep) |
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|
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REAL, intent(in):: entree(:, :) ! (imdep, jmdep) champ \`a transformer |
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|
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! Coordonn\'ees : |
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REAL, intent(in):: x(:) ! (imar) |
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REAL, intent(in):: y(:) ! (jmar) |
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|
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real grille_m(size(x), size(y)) ! (imar, jmar) champ transform\'e |
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|
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! Local: |
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INTEGER imdep, jmdep, imar, jmar |
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INTEGER i, j, ii, jj |
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REAL a(size(x)), b(size(x)) ! (imar) |
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real c(size(y)), d(size(y)) ! (jmar) |
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REAL number(size(x), size(y)) ! (imar, jmar) |
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REAL distans(size(xdata) * size(ydata)) ! (imdep * jmdep) |
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INTEGER i_proche, j_proche, ij_proche |
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REAL zzmin |
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|
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!------------------------- |
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|
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imdep = assert_eq(size(xdata), size(entree, 1), "grille_m") |
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jmdep = assert_eq(size(ydata), size(entree, 2), "grille_m") |
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imar = size(x) |
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jmar = size(y) |
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|
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! Calculer les limites des zones des nouveaux points |
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|
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a(1) = x(1) - (x(2)-x(1))/2.0 |
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b(1) = (x(1)+x(2))/2.0 |
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DO i = 2, imar-1 |
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a(i) = b(i-1) |
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b(i) = (x(i)+x(i+1))/2.0 |
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ENDDO |
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a(imar) = b(imar-1) |
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b(imar) = x(imar) + (x(imar)-x(imar-1))/2.0 |
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|
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c(1) = y(1) - (y(2)-y(1))/2.0 |
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d(1) = (y(1)+y(2))/2.0 |
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DO j = 2, jmar-1 |
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c(j) = d(j-1) |
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d(j) = (y(j)+y(j+1))/2.0 |
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ENDDO |
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c(jmar) = d(jmar-1) |
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d(jmar) = y(jmar) + (y(jmar)-y(jmar-1))/2.0 |
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|
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DO i = 1, imar |
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DO j = 1, jmar |
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number(i, j) = 0.0 |
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grille_m(i, j) = 0.0 |
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ENDDO |
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ENDDO |
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|
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! Determiner la zone sur laquelle chaque ancien point se trouve |
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|
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DO ii = 1, imar |
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DO jj = 1, jmar |
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DO i = 1, imdep |
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IF((xdata(i)-a(ii) >= 1.e-5.AND.xdata(i)-b(ii) <= 1.e-5).OR. & |
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(xdata(i)-a(ii) <= 1.e-5.AND.xdata(i)-b(ii) >= 1.e-5)) & |
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THEN |
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DO j = 1, jmdep |
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IF((ydata(j)-c(jj) >= 1.e-5.AND.ydata(j)-d(jj) <= 1.e-5) & |
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.OR. (ydata(j)-c(jj) <= 1.e-5 .AND. & |
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ydata(j)-d(jj) >= 1.e-5)) THEN |
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number(ii, jj) = number(ii, jj) + 1.0 |
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grille_m(ii, jj) = grille_m(ii, jj) + entree(i, j) |
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ENDIF |
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ENDDO |
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ENDIF |
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ENDDO |
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ENDDO |
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ENDDO |
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|
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DO i = 1, imar |
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DO j = 1, jmar |
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IF (number(i, j) > 0.001) THEN |
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grille_m(i, j) = grille_m(i, j) / number(i, j) |
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ELSE |
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! Si aucun ancien point ne tombe sur une zone, c'est un probl\`eme |
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CALL dist_sphe(x(i), y(j), xdata, ydata, imdep, jmdep, distans) |
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ij_proche = 1 |
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zzmin = distans(ij_proche) |
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DO ii = 2, imdep*jmdep |
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IF (distans(ii) < zzmin) THEN |
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zzmin = distans(ii) |
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ij_proche = ii |
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ENDIF |
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ENDDO |
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j_proche = (ij_proche-1)/imdep + 1 |
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i_proche = ij_proche - (j_proche-1)*imdep |
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grille_m(i, j) = entree(i_proche, j_proche) |
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ENDIF |
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ENDDO |
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ENDDO |
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if (any(number <= 0.001)) print *, "problem in grille_m" |
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|
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END function grille_m |
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|
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end module grille_m_m |
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