from math import sqrt
from numpy.testing import assert_almost_equal, assert_array_almost_equal
from powersimdata.utility.distance import angular_distance, find_closest_neighbor, ll2uv
[docs]def test_ll2uv():
assert_array_almost_equal(ll2uv(0, 0), [1.0, 0.0, 0.0])
assert_array_almost_equal(ll2uv(0, 90), [0.0, 0.0, 1.0]) # north pole
assert_array_almost_equal(ll2uv(45, 90), [0.0, 0.0, 1.0]) # north pole
assert_array_almost_equal(ll2uv(90, 90), [0.0, 0.0, 1.0]) # north pole
assert_array_almost_equal(ll2uv(-45, -90), [0.0, 0.0, -1.0]) # south pole
assert_array_almost_equal(ll2uv(-90, -90), [0.0, 0.0, -1.0]) # south pole
assert_array_almost_equal(ll2uv(-120, -90), [0.0, 0, -1.0]) # south pole
assert_array_almost_equal(ll2uv(45, 45), [1 / 2, 1 / 2, sqrt(2) / 2])
assert_array_almost_equal(ll2uv(60, 60), [1 / 4, sqrt(3) / 4, sqrt(3) / 2])
[docs]def test_angular_distance():
# pole to pole
assert_almost_equal(angular_distance([0.0, 0, 1.0], [0.0, 0, -1.0]), 180)
# equator to north pole
assert_almost_equal(angular_distance([1.0, 0, 0.0], [0.0, 0, 1.0]), 90)
# equator to south pole
assert_almost_equal(
angular_distance([sqrt(2) / 2, sqrt(2) / 2, 0.0], [0.0, 0, -1.0]), 90
)
# 45 deg longitude to 60 deg longitude
assert_almost_equal(
angular_distance([sqrt(2) / 2, sqrt(2) / 2, 0.0], [1 / 2, sqrt(3) / 2, 0.0]), 15
)
[docs]def test_find_closest_neighbor():
point = (45, 45)
neighbors = [
[0, 45],
[10, 50],
[40, 40],
[-120, -60],
[44.75, 45.1],
[-270, 5],
[43, 46],
[320, 45],
[45, 44],
[44, 45],
[44.5, 45.5],
]
closest_neighbor_id = find_closest_neighbor(point, neighbors)
assert closest_neighbor_id == 4
