FGFS-4.1/pyModeS
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minor update of cprNL function

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junzis 2016-07-08 17:53:42 +02:00
parent 5518816b32
commit 556e499064
1 changed files with 14 additions and 9 deletions
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13
pyModeS/adsb.py
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@ -228,16 +228,21 @@ def surface_position(msg0, msg1, t0, t1):
def _cprNL(lat):
try:
if lat == 0:
return 59
if lat == 87 or lat == -87:
return 2
if lat > 87 or lat < -87:
return 1
nz = 15
a = 1 - math.cos(math.pi / (2 * nz))
b = math.cos(math.pi / 180.0 * abs(lat)) ** 2
nl = 2 * math.pi / (math.acos(1 - a/b))
NL = util.floor(nl)
return NL
except:
# happens when latitude is +/-90 degree
return 1
def altitude(msg):