source:
branches/nemo_v3_3_beta/NEMOGCM/NEMO/OPA_SRC/OBS/grt_cir_dis.h90
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| Last change on this file since 2281 was 2281, checked in by smasson, 14 years ago | |
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| 1 | REAL(KIND=wp) FUNCTION grt_cir_dis( pa1, pa2, pb1, pb2, pc1, pc2 ) |
| 2 | !!---------------------------------------------------------------------- |
| 3 | !! *** FUNCTION grt_cir_dis *** |
| 4 | !! |
| 5 | !! ** Purpose : Great circle distance between pts (lat1,lon1) |
| 6 | !! & (lat2,lon2) |
| 7 | !! |
| 8 | !! ** Method : Geometry. |
| 9 | !! |
| 10 | !! History : |
| 11 | !! ! 1995-12 (G. Madec, E. Durand, A. Weaver, N. Daget) Original |
| 12 | !! ! 2006-03 (A. Vidard) Migration to NEMOVAR |
| 13 | !! ! 2006-10 (A. Weaver) Cleanup |
| 14 | !!---------------------------------------------------------------------- |
| 15 | |
| 16 | !! * Arguments |
| 17 | REAL(KIND=wp) :: pa1 ! sin(lat1) |
| 18 | REAL(KIND=wp) :: pa2 ! sin(lat2) |
| 19 | REAL(KIND=wp) :: pb1 ! cos(lat1) * cos(lon1) |
| 20 | REAL(KIND=wp) :: pb2 ! cos(lat2) * cos(lon2) |
| 21 | REAL(KIND=wp) :: pc1 ! cos(lat1) * sin(lon1) |
| 22 | REAL(KIND=wp) :: pc2 ! cos(lat2) * sin(lon2) |
| 23 | |
| 24 | grt_cir_dis = & |
| 25 | & ASIN( SQRT( 1.0 - ( pa1 * pa2 + pb1 * pb2 + pc1 * pc2 )**2 ) ) |
| 26 | |
| 27 | END FUNCTION grt_cir_dis |
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