travel_emission_linear_fit.py
4.12 KB
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import numpy as np
from geopy.distance import great_circle
class BaseEmissionModel():
def __init__(self, config): # Constructor
self.name = config.name
self.slug = config.slug
self.config = config.config
def __repr__(self): # Cast to String
return "Emission model\n" + \
"==============\n" + \
"%s (%s)" % (self.name, self.slug) + \
repr(self.config)
# def compute_travel_footprint()
class EmissionModel(BaseEmissionModel):
# @abc
def compute_travel_footprint(
self,
origin_latitude, # degrees
origin_longitude, # degrees
destination_latitude, # degrees
destination_longitude, # degrees
prefer_train_under_distance=0, # meters
):
footprint = 0.0
#############################################
# TODO: find closest airport(s) and pick one
# We're going to need caching here as well.
from collections import namedtuple
origin_airport = namedtuple('Position', [
'latitude',
'longitude',
'address', # perhaps
])
origin_airport.latitude = origin_latitude
origin_airport.longitude = origin_longitude
destination_airport = namedtuple('Position', [
'latitude',
'longitude',
'address', # perhaps
])
destination_airport.latitude = destination_latitude
destination_airport.longitude = destination_longitude
#############################################
#############################################
# I.a Train travel footprint
# ... TODO
# I.b Airplane travel footprint
footprint += self.compute_airplane_footprint(
origin_latitude=origin_airport.latitude,
origin_longitude=origin_airport.longitude,
destination_latitude=destination_airport.latitude,
destination_longitude=destination_airport.longitude,
)
# II.a Double the footprint if it's a round-trip
footprint *= 2.0
return footprint
def compute_airplane_footprint(
self,
origin_latitude,
origin_longitude,
destination_latitude,
destination_longitude
):
config = self.config.plane_emission_linear_fit
great_circle_distance = self.get_distance_between(
origin_latitude, origin_longitude,
destination_latitude, destination_longitude
)
distance = great_circle_distance
distance = config.connecting_flights_scale * distance
distance = distance * config.scale_before + config.offset_before
footprint = self.apply_scaling_law(
distance,
config.intervals
)
footprint = self.adjust_footprint_for_rfi(footprint, config)
return footprint
def adjust_footprint_for_rfi(self, footprint, config):
# Todo: grab data from config merged with form input?
return config.rfi * footprint
def apply_scaling_law(self, distance, intervals):
footprint = distance
for interval in intervals:
if interval.dmin <= distance < interval.dmax:
offset = interval.offset if interval.offset else 0
scale = interval.scale if interval.scale else 1
footprint = footprint * scale + offset
break
return footprint
def get_distance_between(
self,
origin_latitude,
origin_longitude,
destination_latitude,
destination_longitude
):
"""
:param origin_latitude:
:param origin_longitude:
:param destination_latitude:
:param destination_longitude:
:return: Distance in meters between the two locations,
along Earth's great circles.
"""
gcd = great_circle(
(np.float(origin_latitude), np.float(origin_longitude)),
(np.float(destination_latitude), np.float(destination_longitude))
).m
return gcd