source:
branches/UKMO/dev_r5518_GO6_package/NEMOGCM/NEMO/OPA_SRC/OBS/grt_cir_dis.h90
@
7943
Last change on this file since 7943 was 6486, checked in by davestorkey, 8 years ago | |
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[2287] | 1 | !!---------------------------------------------------------------------- |
2 | !! NEMO/OPA 3.3 , NEMO Consortium (2010) | |
3 | !! $Id$ | |
4 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) | |
5 | !!---------------------------------------------------------------------- | |
6 | ||
[2128] | 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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