source:
branches/UKMO/obs_oper_do_not_assim_update/NEMOGCM/NEMO/OPA_SRC/OBS/grt_cir_dis.h90
@
7915
| Last change on this file since 7915 was 7773, checked in by mattmartin, 7 years ago | |
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| File size: 1.4 KB | |
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| 1 | !!---------------------------------------------------------------------- |
| 2 | !! NEMO/OPA 3.3 , NEMO Consortium (2010) |
| 3 | !! $Id$ |
| 4 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
| 5 | !!---------------------------------------------------------------------- |
| 6 | |
| 7 | REAL(KIND=wp) FUNCTION grt_cir_dis( pa1, pa2, pb1, pb2, pc1, pc2 ) |
| 8 | !!---------------------------------------------------------------------- |
| 9 | !! *** FUNCTION grt_cir_dis *** |
| 10 | !! |
| 11 | !! ** Purpose : Great circle distance between pts (lat1,lon1) |
| 12 | !! & (lat2,lon2) |
| 13 | !! |
| 14 | !! ** Method : Geometry. |
| 15 | !! |
| 16 | !! History : |
| 17 | !! ! 1995-12 (G. Madec, E. Durand, A. Weaver, N. Daget) Original |
| 18 | !! ! 2006-03 (A. Vidard) Migration to NEMOVAR |
| 19 | !! ! 2006-10 (A. Weaver) Cleanup |
| 20 | !!---------------------------------------------------------------------- |
| 21 | |
| 22 | !! * Arguments |
| 23 | REAL(KIND=wp) :: pa1 ! sin(lat1) |
| 24 | REAL(KIND=wp) :: pa2 ! sin(lat2) |
| 25 | REAL(KIND=wp) :: pb1 ! cos(lat1) * cos(lon1) |
| 26 | REAL(KIND=wp) :: pb2 ! cos(lat2) * cos(lon2) |
| 27 | REAL(KIND=wp) :: pc1 ! cos(lat1) * sin(lon1) |
| 28 | REAL(KIND=wp) :: pc2 ! cos(lat2) * sin(lon2) |
| 29 | |
| 30 | grt_cir_dis = & |
| 31 | & ASIN( SQRT( 1.0 - ( pa1 * pa2 + pb1 * pb2 + pc1 * pc2 )**2 ) ) |
| 32 | |
| 33 | END FUNCTION grt_cir_dis |
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