def test_latitude_to_m_per_d_longitude(self):
"""Tests the conversion from latitude to meters per degree longitude."""
# Assume Earth is a sphere
self.assertAlmostEqual(
Telemetry.EQUATORIAL_RADIUS_M * 2.0 * math.pi / 360.0,
Telemetry.latitude_to_m_per_d_longitude(0.0))
# Should be symmetrical
for degree in range(0, 85, 1):
self.assertAlmostEqual(
Telemetry.latitude_to_m_per_d_longitude(degree),
Telemetry.latitude_to_m_per_d_longitude(-degree))
# At the poles, should be 0
self.assertAlmostEqual(Telemetry.latitude_to_m_per_d_longitude(90.0),
0.0)
# Known values, from http://www.csgnetwork.com/degreelenllavcalc.html
self.assertAlmostEqual(Telemetry.M_PER_D_LATITUDE,
111319.458,
places=1)
self.assertAlmostEqual(
# Boulder
Telemetry.latitude_to_m_per_d_longitude(40.08, cache=False),
85294.08886768305,
places=2)
def test_latitude_to_m_per_d_longitude(self):
"""Tests the conversion from latitude to meters per degree longitude."""
# Assume Earth is a sphere
self.assertAlmostEqual(
Telemetry.EQUATORIAL_RADIUS_M * 2.0 * math.pi / 360.0,
Telemetry.latitude_to_m_per_d_longitude(0.0)
)
# Should be symmetrical
for degree in range(0, 85, 1):
self.assertAlmostEqual(
Telemetry.latitude_to_m_per_d_longitude(degree),
Telemetry.latitude_to_m_per_d_longitude(-degree)
)
# At the poles, should be 0
self.assertAlmostEqual(
Telemetry.latitude_to_m_per_d_longitude(90.0),
0.0
)
# Known values, from http://www.csgnetwork.com/degreelenllavcalc.html
self.assertAlmostEqual(
Telemetry.M_PER_D_LATITUDE,
111319.458,
places=1
)
self.assertAlmostEqual(
# Boulder
Telemetry.latitude_to_m_per_d_longitude(40.08, cache=False),
85294.08886768305,
places=2
)
def __init__(self):
self.boulder_latitude_m_per_d_longitude = \
Telemetry.latitude_to_m_per_d_longitude(40.015)
