minor update of cprNL function
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@ -228,17 +228,22 @@ def surface_position(msg0, msg1, t0, t1):
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def _cprNL(lat):
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try:
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nz = 15
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a = 1 - math.cos(math.pi / (2 * nz))
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b = math.cos(math.pi / 180.0 * abs(lat)) ** 2
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nl = 2 * math.pi / (math.acos(1 - a/b))
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NL = util.floor(nl)
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return NL
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except:
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# happens when latitude is +/-90 degree
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if lat == 0:
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return 59
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if lat == 87 or lat == -87:
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return 2
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if lat > 87 or lat < -87:
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return 1
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nz = 15
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a = 1 - math.cos(math.pi / (2 * nz))
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b = math.cos(math.pi / 180.0 * abs(lat)) ** 2
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nl = 2 * math.pi / (math.acos(1 - a/b))
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NL = util.floor(nl)
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return NL
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def altitude(msg):
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"""Decode aircraft altitude
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