source:
branches/2011/dev_r2802_INGV4_zdfRic/NEMOGCM/NEMO/OPA_SRC/OBS/grt_cir_dis_saa.h90
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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_saa( pa, pb, pc ) |
8 | !!---------------------------------------------------------------------- |
9 | !! *** FUNCTION grt_cir_dis_saa *** |
10 | !! |
11 | !! ** Purpose : Great circle distance between pts (lat1,lon1) |
12 | !! & (lat2,lon2) with a small-angle approximation |
13 | !! |
14 | !! ** Method : Geometry |
15 | !! |
16 | !! ** Action : |
17 | !! |
18 | !! History |
19 | !! ! 95-12 (G. Madec, E. Durand, A. Weaver, N. Daget) Original |
20 | !! ! 06-03 (A. Vidard) Migration to NEMOVAR |
21 | !! ! 06-10 (A. Weaver) Cleanup |
22 | !!---------------------------------------------------------------------- |
23 | |
24 | !! * Arguments |
25 | REAL(KIND=wp) :: pa ! lon1 - lon2 |
26 | REAL(KIND=wp) :: pb ! lat1 - lat2 |
27 | REAL(KIND=wp) :: pc ! cos(lat2) |
28 | |
29 | grt_cir_dis_saa = SQRT( pa * pa + ( pb * pc )**2 ) |
30 | |
31 | END FUNCTION grt_cir_dis_saa |
32 |
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