| 1 | !!---------------------------------------------------------------------- |
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| 2 | !! NEMO/OCE 4.0 , NEMO Consortium (2018) |
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| 3 | !! $Id$ |
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| 4 | !! Software governed by the CeCILL license (see ./LICENSE) |
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| 5 | !!---------------------------------------------------------------------- |
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| 6 | |
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| 7 | REAL(dp) FUNCTION maxdist( pxv, pyv ) |
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| 8 | !!---------------------------------------------------------------------- |
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| 9 | !! *** FUNCTION maxdist *** |
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| 10 | !! |
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| 11 | !! ** Purpose : Compute the maximum distance between any points within |
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| 12 | !! a cell |
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| 13 | !! |
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| 14 | !! ** Method : Call to grt_cir_dis |
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| 15 | !! |
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| 16 | !! ** Action : |
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| 17 | !! |
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| 18 | !! History : |
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| 19 | !! ! 2006-08 (K. Mogensen) |
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| 20 | !! ! 2006-10 (A. Weaver) Cleanup |
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| 21 | !!---------------------------------------------------------------------- |
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| 22 | |
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| 23 | !! * Arguments |
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| 24 | REAL(KIND=wp), DIMENSION(4), INTENT(IN) :: & |
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| 25 | & pxv, & ! (lon, lat) of the surrounding cell |
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| 26 | & pyv |
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| 27 | |
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| 28 | !! * Local declarations |
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| 29 | REAL(KIND=dp), DIMENSION(4) :: zxv, zyv, za, zb, zc |
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| 30 | |
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| 31 | |
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| 32 | |
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| 33 | |
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| 34 | |
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| 35 | |
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| 36 | REAL(KIND=dp) :: zdist |
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| 37 | |
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| 38 | INTEGER :: ji |
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| 39 | INTEGER :: jj |
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| 40 | |
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| 41 | !----------------------------------------------------------------------- |
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| 42 | ! Convert data to radians |
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| 43 | !----------------------------------------------------------------------- |
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| 44 | DO ji = 1, 4 |
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| 45 | zxv(ji) = pxv(ji) * rad |
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| 46 | zyv(ji) = pyv(ji) * rad |
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| 47 | END DO |
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| 48 | |
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| 49 | !----------------------------------------------------------------------- |
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| 50 | ! Prepare input to grt_cir_dis |
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| 51 | !----------------------------------------------------------------------- |
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| 52 | DO ji = 1, 4 |
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| 53 | za(ji) = SIN( zyv(ji) ) |
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| 54 | zb(ji) = COS( zyv(ji) ) * COS( zxv(ji) ) |
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| 55 | zc(ji) = COS( zyv(ji) ) * SIN( zxv(ji) ) |
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| 56 | END DO |
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| 57 | |
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| 58 | !----------------------------------------------------------------------- |
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| 59 | ! Get max distance between any points in the area |
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| 60 | !----------------------------------------------------------------------- |
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| 61 | maxdist = 0.0 |
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| 62 | DO jj = 1, 4 |
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| 63 | DO ji = jj+1, 4 |
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| 64 | zdist = grt_cir_dis( za(jj), za(ji), zb(jj), & |
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| 65 | & zb(ji), zc(jj), zc(ji)) |
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| 66 | IF ( zdist > maxdist ) THEN |
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| 67 | maxdist = zdist |
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| 68 | ENDIF |
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| 69 | END DO |
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| 70 | END DO |
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| 71 | |
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| 72 | !----------------------------------------------------------------------- |
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| 73 | ! Convert to degrees. |
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| 74 | !----------------------------------------------------------------------- |
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| 75 | maxdist = maxdist / rad |
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| 76 | |
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| 77 | END FUNCTION maxdist |
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