def from_lat_long(
cls, latitude, longitude, time_zone, month, day, hour, sky_type=0,
north_angle=0, ground_reflectance=0.2):
"""Create sky with certain illuminance.
Args:
latitude: Location latitude between -90 and 90.
longitude:Location longitude between -180 (west) and 180 (east).
timezone: Time zone between -12 hours (west) and +14 hours (east).
month: An intger between 1-12 for month.
day: An intger between 1 to 28-31 depending on the input month.
hour: A float number larger or equal to 0 and smaller than 24.
sky_type: An integer between 0..5 to indicate CIE Sky Type.
* 0 = Sunny with sun. Sunny sky with sun. In addition to the sky
distribution function, a source description of the sun is generated.
* 1 = Sunny without sun. Sunny sky without sun. The sky distribution will
correspond to a standard CIE clear day.
* 2 = Intermediate with sun. In addition to the sky distribution, a
(somewhat subdued) sun is generated.
* 3 = Intermediate without sun. The sky will correspond to a standard CIE
intermediate day.
* 4 = Cloudy sky. The sky distribution will correspond to a standard CIE
overcast day.
* 5 = Uniform cloudy sky. The sky distribution will be completely
uniform.
north_angle: North angle in degrees. A number between -360 and 360 for the
counterclockwise difference between the North and the positive Y-axis in
degrees. 90 is West and 270 is East (Default: 0).
ground_reflectance: Average ground reflectance (Default: 0.2).
"""
# calculate altitude and azimuth using ladybug's sunpath
sp = Sunpath(latitude, longitude, time_zone, north_angle)
sun = sp.calculate_sun(month, day, hour)
return cls(sun.altitude, sun.azimuth_from_y_axis, sky_type, ground_reflectance)
def from_lat_long(cls,
latitude,
longitude,
time_zone,
month,
day,
hour,
direct_normal_irradiance,
diffuse_horizontal_irradiance,
north_angle=0,
ground_reflectance=0.2):
"""Create sky with certain illuminance.
Args:
latitude: Location latitude between -90 and 90.
longitude: Location longitude between -180 (west) and 180 (east).
time_zone: Time zone between -12 hours (west) and +14 hours (east). If
None, the time will be interpreted as solar time at the given longitude.
month: An intger between 1-12 for month.
day: An intger between 1 to 28-31 depending on the input month.
hour: A float number larger or equal to 0 and smaller than 24.
direct_normal_irradiance: Direct normal irradiance (W/m2).
diffuse_horizontal_irradiance: Diffuse horizontal irradiance (W/m2).
north_angle: North angle in degrees. A number between -360 and 360 for the
counterclockwise difference between the North and the positive Y-axis in
degrees. 90 is West and 270 is East (Default: 0).
ground_reflectance: Average ground reflectance (Default: 0.2).
"""
# calculate altitude and azimuth using ladybug's sunpath
sp = Sunpath(latitude, longitude, time_zone, north_angle)
sun = sp.calculate_sun(month, day, hour)
return cls(sun.altitude, sun.azimuth_from_y_axis,
direct_normal_irradiance, diffuse_horizontal_irradiance,
ground_reflectance)
def test_init_solar_envelope():
"""Test the initialization of Sunpath and basic properties."""
# get sun positions
sunpath = Sunpath(latitude=40.72, longitude=-74.02)
sun_vecs = []
for hour in range(8, 16):
sun = sunpath.calculate_sun(12, 21, hour)
sun_vecs.append(sun.sun_vector)
# load the site and the context
site_mesh_file = './tests/assets/geo/mesh.json'
with open(site_mesh_file) as json_file:
site_mesh_data = json.load(json_file)
site_mesh = Mesh3D.from_dict(site_mesh_data)
context_file = './tests/assets/geo/faces.json'
with open(context_file) as json_file:
context_data = json.load(json_file)
context_faces = [Face3D.from_dict(con) for con in context_data]
# initialize solar envelope
envelope = SolarEnvelope(site_mesh, context_faces, sun_vecs, solar_rights=True)
str(envelope) # test the string representation
envelope_mesh = envelope.envelope_mesh()
assert isinstance(envelope_mesh, Mesh3D)