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