def __reverse(self, **kwargs):
"""
Reverse particle just off of the shore in the direction that it came in.
Adds a slight random factor to the distance and angle it is reversed in.
"""
#st = time.clock()
start_point = kwargs.pop('start_point')
hit_point = kwargs.pop('hit_point')
reverse_azimuth = kwargs.pop('reverse_azimuth')
reverse_distance = kwargs.get('reverse_distance', None)
if reverse_distance is None:
reverse_distance = 100
# Randomize the reverse angle slightly (+/- 5 degrees)
random_azimuth = reverse_azimuth + AsaRandom.random() * 5
count = 0
nudge_distance = 0.01
nudge_point = AsaGreatCircle.great_circle(distance=nudge_distance, azimuth=reverse_azimuth, start_point=hit_point)
nudge_loc = Location4D(latitude=nudge_point['latitude'], longitude=nudge_point['longitude'], depth=start_point.depth)
# Find point just offshore to do testing with. Try 15 times (~350m). This makes sure the start_point is in the water
# for the next call to intersect (next while loop).
while self.intersect(single_point=nudge_loc.point) and count < 16:
nudge_distance *= 2
nudge_point = AsaGreatCircle.great_circle(distance=nudge_distance, azimuth=reverse_azimuth, start_point=hit_point)
nudge_loc = Location4D(latitude=nudge_point['latitude'], longitude=nudge_point['longitude'], depth=start_point.depth)
count += 1
# We tried 16 times and couldn't find a point. This should totally never happen.
if count == 16:
logger.warn("LOOK: Could not find location in water to do shoreline calculation with. Assuming particle did not move from original location")
return start_point
# Keep trying to throw particle back, halfing the distance each time until it is in water.
# Only half it 6 times before giving up and returning the point which the particle came from.
count = 0
# Distance amount to half each iteration
changing_distance = reverse_distance
new_point = AsaGreatCircle.great_circle(distance=reverse_distance, azimuth=random_azimuth, start_point=hit_point)
new_loc = Location4D(latitude=new_point['latitude'], longitude=new_point['longitude'], depth=start_point.depth)
# We don't want to reverse further than the current spatial buffer, because we will reindex the
# source file everytime we reverse, which will slow down the calculations considerably.
while (not self._spatial_query_object.contains(new_loc.point) or self.intersect(start_point=nudge_loc.point, end_point=new_loc.point)) and count < 6:
changing_distance /= 2
new_point = AsaGreatCircle.great_circle(distance=changing_distance, azimuth=random_azimuth, start_point=hit_point)
new_loc = Location4D(latitude=new_point['latitude'], longitude=new_point['longitude'], depth=start_point.depth)
count += 1
# We tried 10 times and the particle was still on shore, return the point the particle started from.
# No randomization.
if count == 6:
logger.warn("LOOK: Could not react particle with shoreline. Assuming particle did not move from original location")
return start_point
#logger.info("Reaction time: %f" % (time.clock() - st))
return new_loc
def test_great_circle_angles(self):
# One decimal degree is 111000m
starting = Location4D(latitude=40.00, longitude=-76.00, depth=0)
azimuth = 90
new_gc = AsaGreatCircle.great_circle(distance=111000, azimuth=azimuth, start_point=starting)
new_pt = Location4D(latitude=new_gc['latitude'], longitude=new_gc['longitude'])
# We should have gone to the right
assert new_pt.longitude > starting.longitude + 0.9
azimuth = 270
new_gc = AsaGreatCircle.great_circle(distance=111000, azimuth=azimuth, start_point=starting)
new_pt = Location4D(latitude=new_gc['latitude'], longitude=new_gc['longitude'])
# We should have gone to the left
assert new_pt.longitude < starting.longitude - 0.9
azimuth = 180
new_gc = AsaGreatCircle.great_circle(distance=111000, azimuth=azimuth, start_point=starting)
new_pt = Location4D(latitude=new_gc['latitude'], longitude=new_gc['longitude'])
# We should have gone down
assert new_pt.latitude < starting.latitude - 0.9
azimuth = 0
new_gc = AsaGreatCircle.great_circle(distance=111000, azimuth=azimuth, start_point=starting)
new_pt = Location4D(latitude=new_gc['latitude'], longitude=new_gc['longitude'])
# We should have gone up
assert new_pt.latitude > starting.latitude + 0.9
azimuth = 315
new_gc = AsaGreatCircle.great_circle(distance=111000, azimuth=azimuth, start_point=starting)
new_pt = Location4D(latitude=new_gc['latitude'], longitude=new_gc['longitude'])
# We should have gone up and to the left
assert new_pt.latitude > starting.latitude + 0.45
assert new_pt.longitude < starting.longitude - 0.45
def __reverse(self, **kwargs):
"""
Reverse particle just off of the shore in the direction that it came in.
Adds a slight random factor to the distance and angle it is reversed in.
"""
start_point = kwargs.pop('start_point')
hit_point = kwargs.pop('hit_point')
distance = kwargs.pop('distance')
azimuth = kwargs.pop('azimuth')
reverse_azimuth = kwargs.pop('reverse_azimuth')
reverse_distance = kwargs.get('reverse_distance', None)
if reverse_distance is None:
reverse_distance = 100
# Randomize the reverse angle slightly (+/- 5 degrees)
random_azimuth = reverse_azimuth + AsaRandom.random() * 5
count = 0
nudge_distance = 0.01
nudge_point = AsaGreatCircle.great_circle(distance=nudge_distance, azimuth=reverse_azimuth, start_point=hit_point)
nudge_loc = Location4D(latitude=nudge_point['latitude'], longitude=nudge_point['longitude'], depth=start_point.depth)
# Find point just offshore to do testing with. Try 15 times (~350m). This makes sure the start_point is in the water
# for the next call to intersect (next while loop).
while self.intersect(single_point=nudge_loc.point) and count < 16:
nudge_distance *= 2
nudge_point = AsaGreatCircle.great_circle(distance=nudge_distance, azimuth=reverse_azimuth, start_point=hit_point)
nudge_loc = Location4D(latitude=nudge_point['latitude'], longitude=nudge_point['longitude'], depth=start_point.depth)
count += 1
# We tried 16 times and couldn't find a point. This should totally never happen.
if count == 16:
logger.debug("WOW. Could not find location in water to do shoreline calculation with. Assuming particle did not move from original location")
return start_point
# Keep trying to throw particle back, halfing the distance each time until it is in water.
# Only half it 12 times before giving up and returning the point which the particle came from.
count = 0
# Distance amount to half each iteration
changing_distance = reverse_distance
new_point = AsaGreatCircle.great_circle(distance=reverse_distance, azimuth=random_azimuth, start_point=hit_point)
new_loc = Location4D(latitude=new_point['latitude'], longitude=new_point['longitude'], depth=start_point.depth)
while self.intersect(start_point=nudge_loc.point, end_point=new_loc.point) and count < 12:
changing_distance /= 2
new_point = AsaGreatCircle.great_circle(distance=changing_distance, azimuth=random_azimuth, start_point=hit_point)
new_loc = Location4D(latitude=new_point['latitude'], longitude=new_point['longitude'], depth=start_point.depth)
count += 1
# We tried 10 times and the particle was still on shore, return the point the particle started from.
# No randomization.
if count == 12:
logger.debug("Could not react particle with shoreline. Assuming particle did not move from original location")
return start_point
return new_loc
def near_xy(self, **kwargs):
"""
TODO: Implement ncell near_xy
"""
point = kwargs.get("point", None)
if point == None:
lat = kwargs.get("lat", None)
lon = kwargs.get("lon", None)
point = Location4D(latitude=lat, longitude=lon)
num = kwargs.get("num", 1)
ncell = kwargs.get("ncell", False)
if ncell:
if num > 1:
pass
else:
distance = AsaGreatCircle.great_distance(
start_lats=self._yarray,
start_lons=self._xarray,
end_lats=point.latitude,
end_lons=point.longitude)["distance"]
inds = np.where(distance == np.nanmin(distance))
xinds, yinds = inds, inds
else:
if self._ndim == 2:
distance = AsaGreatCircle.great_distance(
start_lats=self._yarray,
start_lons=self._xarray,
end_lats=point.latitude,
end_lons=point.longitude)["distance"]
yinds, xinds = np.where(distance == np.nanmin(distance))
else:
#if self._xmesh == None and self._ymesh == None:
# self._xmesh, self._ymesh = np.meshgrid(self._xarray, self._yarray)
if num > 1:
minlat = np.abs(self._yarray - point.latitude)
minlon = np.abs(self._xarray - point.longitude)
lat_cutoff = np.sort(minlat)[num - 1]
lon_cutoff = np.sort(minlon)[num - 1]
elif num == 1:
lat_cutoff = np.nanmin(
np.abs(self._yarray - point.latitude))
lon_cutoff = np.nanmin(
np.abs(self._xarray - point.longitude))
yinds = np.where(
np.abs(self._yarray - point.latitude) <= lat_cutoff)
xinds = np.where(
np.abs(self._xarray - point.longitude) <= lon_cutoff)
return yinds, xinds
def test_reverse_half_distance_until_in_water(self):
s = Shoreline(type='reverse')
starting = Location4D(latitude=39.05, longitude=-75.34, depth=0)
ending = Location4D(latitude=38.96, longitude=-75.315, depth=0)
difference = AsaGreatCircle.great_distance(start_point=starting, end_point=ending)
angle = AsaMath.azimuth_to_math_angle(azimuth=difference['azimuth'])
distance = difference['distance']
intersection = s.intersect(start_point=starting.point, end_point=ending.point)
int4d = Location4D(point=intersection['point'])
final_point = s.react( start_point = starting,
hit_point = int4d,
end_point = ending,
feature = intersection['feature'],
distance = distance,
angle = angle,
azimuth = difference['azimuth'],
reverse_azimuth = difference['reverse_azimuth'],
reverse_distance = 40000)
# Should be in water
assert s.intersect(start_point=final_point.point, end_point=final_point.point) is None
def test_reverse_left(self):
s = Shoreline(type='reverse')
starting = Location4D(latitude=39.1, longitude=-74.91, depth=0)
ending = Location4D(latitude=39.1, longitude=-74.85, depth=0)
difference = AsaGreatCircle.great_distance(start_point=starting, end_point=ending)
angle = AsaMath.azimuth_to_math_angle(azimuth=difference['azimuth'])
distance = difference['distance']
intersection = s.intersect(start_point=starting.point, end_point=ending.point)
int4d = Location4D(point=intersection['point'])
final_point = s.react( start_point = starting,
hit_point = int4d,
end_point = ending,
feature = intersection['feature'],
distance = distance,
angle = angle,
azimuth = difference['azimuth'],
reverse_azimuth = difference['reverse_azimuth'])
# Since we are on a stright horizonal line, the latitude will change only slightly
assert abs(final_point.latitude - starting.latitude) < 0.005
# Resulting longitude should be between the startpoint and the intersection point
assert final_point.longitude < int4d.longitude
assert final_point.longitude > starting.longitude
def test_reverse_up_left(self):
s = Shoreline(type='reverse')
starting = Location4D(latitude=39.05, longitude=-75.34, depth=0)
ending = Location4D(latitude=38.96, longitude=-75.315, depth=0)
difference = AsaGreatCircle.great_distance(start_point=starting, end_point=ending)
angle = AsaMath.azimuth_to_math_angle(azimuth=difference['azimuth'])
distance = difference['distance']
intersection = s.intersect(start_point=starting.point, end_point=ending.point)
int4d = Location4D(point=intersection['point'])
final_point = s.react( start_point = starting,
hit_point = int4d,
end_point = ending,
feature = intersection['feature'],
distance = distance,
angle = angle,
azimuth = difference['azimuth'],
reverse_azimuth = difference['reverse_azimuth'])
# Resulting latitude should be between the startpoint and the intersection point
assert final_point.latitude > int4d.latitude
assert final_point.latitude < starting.latitude
# Resulting longitude should be between the startpoint and the intersection point
assert final_point.longitude < int4d.longitude
assert final_point.longitude > starting.longitude
def test_reverse_distance_traveled(self):
s = Shoreline(type='reverse')
starting = Location4D(latitude=39.05, longitude=-75.34, depth=0)
ending = Location4D(latitude=38.96, longitude=-75.315, depth=0)
difference = AsaGreatCircle.great_distance(start_point=starting,
end_point=ending)
angle = AsaMath.azimuth_to_math_angle(azimuth=difference['azimuth'])
distance = difference['distance']
intersection = s.intersect(start_point=starting.point,
end_point=ending.point)
int4d = Location4D(point=intersection['point'])
final_point = s.react(start_point=starting,
hit_point=int4d,
end_point=ending,
feature=intersection['feature'],
distance=distance,
angle=angle,
azimuth=difference['azimuth'],
reverse_azimuth=difference['reverse_azimuth'],
reverse_distance=0.000001)
# Resulting point should be VERY close to the hit point.
assert abs(int4d.latitude - final_point.latitude) < 0.005
assert abs(int4d.longitude - final_point.longitude) < 0.005
def test_reverse_left(self):
s = Shoreline(type='reverse')
starting = Location4D(latitude=39.1, longitude=-74.91, depth=0)
ending = Location4D(latitude=39.1, longitude=-74.85, depth=0)
difference = AsaGreatCircle.great_distance(start_point=starting,
end_point=ending)
angle = AsaMath.azimuth_to_math_angle(azimuth=difference['azimuth'])
distance = difference['distance']
intersection = s.intersect(start_point=starting.point,
end_point=ending.point)
int4d = Location4D(point=intersection['point'])
final_point = s.react(start_point=starting,
hit_point=int4d,
end_point=ending,
feature=intersection['feature'],
distance=distance,
angle=angle,
azimuth=difference['azimuth'],
reverse_azimuth=difference['reverse_azimuth'])
# Since we are on a stright horizonal line, the latitude will change only slightly
assert abs(final_point.latitude - starting.latitude) < 0.005
# Resulting longitude should be between the startpoint and the intersection point
assert final_point.longitude < int4d.longitude
assert final_point.longitude > starting.longitude
def test_reverse_distance_traveled(self):
s = Shoreline(type='reverse')
starting = Location4D(latitude=39.05, longitude=-75.34, depth=0)
ending = Location4D(latitude=38.96, longitude=-75.315, depth=0)
difference = AsaGreatCircle.great_distance(start_point=starting, end_point=ending)
angle = AsaMath.azimuth_to_math_angle(azimuth=difference['azimuth'])
distance = difference['distance']
intersection = s.intersect(start_point=starting.point, end_point=ending.point)
int4d = Location4D(point=intersection['point'])
final_point = s.react( start_point = starting,
hit_point = int4d,
end_point = ending,
feature = intersection['feature'],
distance = distance,
angle = angle,
azimuth = difference['azimuth'],
reverse_azimuth = difference['reverse_azimuth'],
reverse_distance = 0.000001)
# Resulting point should be VERY close to the hit point.
assert abs(int4d.latitude - final_point.latitude) < 0.005
assert abs(int4d.longitude - final_point.longitude) < 0.005
def test_reverse_12_times_then_start_point(self):
s = Shoreline(type='reverse')
starting = Location4D(latitude=39.05, longitude=-75.34, depth=0)
ending = Location4D(latitude=38.96, longitude=-75.315, depth=0)
difference = AsaGreatCircle.great_distance(start_point=starting,
end_point=ending)
angle = AsaMath.azimuth_to_math_angle(azimuth=difference['azimuth'])
distance = difference['distance']
intersection = s.intersect(start_point=starting.point,
end_point=ending.point)
int4d = Location4D(point=intersection['point'])
final_point = s.react(start_point=starting,
hit_point=int4d,
end_point=ending,
feature=intersection['feature'],
distance=distance,
angle=angle,
azimuth=difference['azimuth'],
reverse_azimuth=difference['reverse_azimuth'],
reverse_distance=9999999999999999999999999999)
# Should be start location
assert final_point.longitude == starting.longitude
assert final_point.latitude == starting.latitude
assert final_point.depth == starting.depth
def test_reverse_half_distance_until_in_water(self):
s = Shoreline(type='reverse')
starting = Location4D(latitude=39.05, longitude=-75.34, depth=0)
ending = Location4D(latitude=38.96, longitude=-75.315, depth=0)
difference = AsaGreatCircle.great_distance(start_point=starting,
end_point=ending)
angle = AsaMath.azimuth_to_math_angle(azimuth=difference['azimuth'])
distance = difference['distance']
intersection = s.intersect(start_point=starting.point,
end_point=ending.point)
int4d = Location4D(point=intersection['point'])
final_point = s.react(start_point=starting,
hit_point=int4d,
end_point=ending,
feature=intersection['feature'],
distance=distance,
angle=angle,
azimuth=difference['azimuth'],
reverse_azimuth=difference['reverse_azimuth'],
reverse_distance=40000)
# Should be in water
assert s.intersect(start_point=final_point.point,
end_point=final_point.point) is None
def test_reverse_up_left(self):
s = Shoreline(type='reverse')
starting = Location4D(latitude=39.05, longitude=-75.34, depth=0)
ending = Location4D(latitude=38.96, longitude=-75.315, depth=0)
difference = AsaGreatCircle.great_distance(start_point=starting,
end_point=ending)
angle = AsaMath.azimuth_to_math_angle(azimuth=difference['azimuth'])
distance = difference['distance']
intersection = s.intersect(start_point=starting.point,
end_point=ending.point)
int4d = Location4D(point=intersection['point'])
final_point = s.react(start_point=starting,
hit_point=int4d,
end_point=ending,
feature=intersection['feature'],
distance=distance,
angle=angle,
azimuth=difference['azimuth'],
reverse_azimuth=difference['reverse_azimuth'])
# Resulting latitude should be between the startpoint and the intersection point
assert final_point.latitude > int4d.latitude
assert final_point.latitude < starting.latitude
# Resulting longitude should be between the startpoint and the intersection point
assert final_point.longitude < int4d.longitude
assert final_point.longitude > starting.longitude
def test_reverse_10_times_then_start_point(self):
s = Shoreline(type='reverse')
starting = Location4D(latitude=39.05, longitude=-75.34, depth=0)
ending = Location4D(latitude=38.96, longitude=-75.315, depth=0)
difference = AsaGreatCircle.great_distance(start_point=starting, end_point=ending)
angle = AsaMath.azimuth_to_math_angle(azimuth=difference['azimuth'])
distance = difference['distance']
intersection = s.intersect(start_point=starting.point, end_point=ending.point)
int4d = Location4D(point=intersection['point'])
final_point = s.react( start_point = starting,
hit_point = int4d,
end_point = ending,
feature = intersection['feature'],
distance = distance,
angle = angle,
azimuth = difference['azimuth'],
reverse_azimuth = difference['reverse_azimuth'],
reverse_distance = 9999999999999999999999999999)
# Should be start location
assert final_point.longitude == starting.longitude
assert final_point.latitude == starting.latitude
assert final_point.depth == starting.depth
def __bounce(self, **kwargs):
"""
Bounce off of the shoreline.
NOTE: This does not work, but left here for future implementation
feature = Linestring of two points, being the line segment the particle hit.
angle = decimal degrees from 0 (x-axis), couter-clockwise (math style)
"""
start_point = kwargs.pop('start_point')
hit_point = kwargs.pop('hit_point')
end_point = kwargs.pop('end_point')
feature = kwargs.pop('feature')
distance = kwargs.pop('distance')
angle = kwargs.pop('angle')
# Figure out the angle of the shoreline here (beta)
points_in_shore = map(lambda x: Point(x), list(feature.coords))
points_in_shore = sorted(points_in_shore, key=lambda x: x.x)
# The point on the left (least longitude is always the first Point)
first_shore = points_in_shore[0]
last_shore = points_in_shore[-1]
shoreline_x = abs(abs(first_shore.x) - abs(last_shore.x))
shoreline_y = abs(abs(first_shore.y) - abs(last_shore.y))
beta = math.degrees(math.atan(shoreline_x / shoreline_y))
theta = 90 - angle - beta
bounce_azimuth = AsaMath.math_angle_to_azimuth(angle=2 * theta + angle)
print "Beta: " + str(beta)
print "Incoming Angle: " + str(angle)
print "ShorelineAngle: " + str(theta + angle)
print "Bounce Azimuth: " + str(bounce_azimuth)
print "Bounce Angle: " + str(
AsaMath.azimuth_to_math_angle(azimuth=bounce_azimuth))
after_distance = distance - AsaGreatCircle.great_distance(
start_point=start_point, end_point=hit_point)['distance']
new_point = AsaGreatCircle.great_circle(distance=after_distance,
azimuth=bounce_azimuth,
start_point=hit_point)
return Location4D(latitude=new_point['latitude'],
longitude=new_point['longitude'],
depth=start_point.depth)
def __bounce(self, **kwargs):
"""
Bounce off of the shoreline.
NOTE: This does not work, but left here for future implementation
feature = Linestring of two points, being the line segment the particle hit.
angle = decimal degrees from 0 (x-axis), couter-clockwise (math style)
"""
start_point = kwargs.pop("start_point")
hit_point = kwargs.pop("hit_point")
end_point = kwargs.pop("end_point")
feature = kwargs.pop("feature")
distance = kwargs.pop("distance")
angle = kwargs.pop("angle")
# Figure out the angle of the shoreline here (beta)
points_in_shore = map(lambda x: Point(x), list(feature.coords))
points_in_shore = sorted(points_in_shore, key=lambda x: x.x)
# The point on the left (least longitude is always the first Point)
first_shore = points_in_shore[0]
last_shore = points_in_shore[-1]
shoreline_x = abs(abs(first_shore.x) - abs(last_shore.x))
shoreline_y = abs(abs(first_shore.y) - abs(last_shore.y))
beta = math.degrees(math.atan(shoreline_x / shoreline_y))
theta = 90 - angle - beta
bounce_azimuth = AsaMath.math_angle_to_azimuth(angle=2 * theta + angle)
print "Beta: " + str(beta)
print "Incoming Angle: " + str(angle)
print "ShorelineAngle: " + str(theta + angle)
print "Bounce Azimuth: " + str(bounce_azimuth)
print "Bounce Angle: " + str(AsaMath.azimuth_to_math_angle(azimuth=bounce_azimuth))
after_distance = (
distance - AsaGreatCircle.great_distance(start_point=start_point, end_point=hit_point)["distance"]
)
new_point = AsaGreatCircle.great_circle(distance=after_distance, azimuth=bounce_azimuth, start_point=hit_point)
return Location4D(latitude=new_point["latitude"], longitude=new_point["longitude"], depth=start_point.depth)
def __reverse(self, **kwargs):
"""
Reverse particle just off of the shore in the direction that it came in.
Adds a slight random factor to the distance and angle it is reversed in.
"""
start_point = kwargs.pop('start_point')
hit_point = kwargs.pop('hit_point')
distance = kwargs.pop('distance')
azimuth = kwargs.pop('azimuth')
reverse_azimuth = kwargs.pop('reverse_azimuth')
reverse_distance = kwargs.get('reverse_distance', None)
if reverse_distance is None:
reverse_distance = 100
# Randomize the reverse angle slightly (+/- 5 degrees)
random_azimuth = reverse_azimuth + AsaRandom.random() * 5
# Nudge the hitpoint off of the shore by a tiny bit to test shoreline intersection in while loop.
nudged_hit_point = AsaGreatCircle.great_circle(distance=0.01, azimuth=random_azimuth, start_point=hit_point)
nudged_hit_location = Location4D(latitude=nudged_hit_point['latitude'], longitude=nudged_hit_point['longitude'], depth=start_point.depth)
new_point = AsaGreatCircle.great_circle(distance=reverse_distance, azimuth=random_azimuth, start_point=hit_point)
new_loc = Location4D(latitude=new_point['latitude'], longitude=new_point['longitude'], depth=start_point.depth)
# Keep trying to throw particle back, halfing the distance each time until it is in water.
# Only half it 10 times before giving up and returning the point which the particle came from.
count = 0
# Distance amount to half each iteration
changing_distance = reverse_distance
while self.intersect(start_point=nudged_hit_location.point, end_point=new_loc.point) and count < 10:
changing_distance /= 2
new_point = AsaGreatCircle.great_circle(distance=changing_distance, azimuth=random_azimuth, start_point=hit_point)
new_loc = Location4D(latitude=new_point['latitude'], longitude=new_point['longitude'], depth=start_point.depth)
count += 1
# We tried 10 times and the particle was still on shore, return the point the particle started from.
# No randomization.
if count == 10:
logger.warn("Could not react particle with shoreline. Assuming particle did not move from original location")
new_loc = start_point
return new_loc
def near_xy(self, **kwargs):
"""
TODO: Implement ncell near_xy
"""
point = kwargs.get("point", None)
if point == None:
lat = kwargs.get("lat", None)
lon = kwargs.get("lon", None)
point = Location4D(latitude=lat, longitude=lon)
num = kwargs.get("num", 1)
ncell = kwargs.get("ncell", False)
if ncell:
if num > 1:
pass
else:
distance = AsaGreatCircle.great_distance(
start_lats=self._yarray, start_lons=self._xarray, end_lats=point.latitude, end_lons=point.longitude
)["distance"]
inds = np.where(distance == np.nanmin(distance))
xinds, yinds = inds, inds
else:
if self._ndim == 2:
distance = AsaGreatCircle.great_distance(
start_lats=self._yarray, start_lons=self._xarray, end_lats=point.latitude, end_lons=point.longitude
)["distance"]
yinds, xinds = np.where(distance == np.nanmin(distance))
else:
# if self._xmesh == None and self._ymesh == None:
# self._xmesh, self._ymesh = np.meshgrid(self._xarray, self._yarray)
if num > 1:
minlat = np.abs(self._yarray - point.latitude)
minlon = np.abs(self._xarray - point.longitude)
lat_cutoff = np.sort(minlat)[num - 1]
lon_cutoff = np.sort(minlon)[num - 1]
elif num == 1:
lat_cutoff = np.nanmin(np.abs(self._yarray - point.latitude))
lon_cutoff = np.nanmin(np.abs(self._xarray - point.longitude))
yinds = np.where(np.abs(self._yarray - point.latitude) <= lat_cutoff)
xinds = np.where(np.abs(self._xarray - point.longitude) <= lon_cutoff)
return yinds, xinds
def distance_from_location_using_u_v_w(cls, u=None, v=None, w=None, timestep=None, location=None):
"""
Calculate the greate distance from a location using u, v, and w.
u, v, and w must be in the same units as the timestep. Stick with seconds.
"""
# Move horizontally
distance_horiz = 0
azimuth = 0
angle = 0
depth = location.depth
if u is not 0 and v is not 0:
s_and_d = AsaMath.speed_direction_from_u_v(u=u,v=v) # calculates velocity in m/s from transformed u and v
distance_horiz = s_and_d['speed'] * timestep # calculate the horizontal distance in meters using the velocity and model timestep
angle = s_and_d['direction']
# Great circle calculation
# Calculation takes in azimuth (heading from North, so convert our mathematical angle to azimuth)
azimuth = AsaMath.math_angle_to_azimuth(angle=angle)
distance_vert = 0.
if w is not None:
# Move vertically
# Depth is positive up, negative down. w wil be negative if moving down, and positive if moving up
distance_vert = w * timestep
depth += distance_vert # calculate the vertical distance in meters using w (m/s) and model timestep (s)
if distance_horiz != 0:
vertical_angle = math.degrees(math.atan(distance_vert / distance_horiz))
gc_result = AsaGreatCircle.great_circle(distance=distance_horiz, azimuth=azimuth, start_point=location)
else:
# Did we go up or down?
vertical_angle = 0.
if distance_vert < 0:
# Down
vertical_angle = 270.
elif distance_vert > 0:
# Up
vertical_angle = 90.
gc_result = { 'latitude': location.latitude, 'longitude': location.longitude, 'reverse_azimuth': 0 }
#logger.info("Particle moving from %fm to %fm from a vertical speed of %f m/s over %s seconds" % (location.depth, depth, w, str(timestep)))
gc_result['azimuth'] = azimuth
gc_result['depth'] = depth
gc_result['distance'] = distance_horiz
gc_result['angle'] = angle
gc_result['vertical_distance'] = distance_vert
gc_result['vertical_angle'] = vertical_angle
return gc_result
def __reverse(self, **kwargs):
"""
Reverse particle just off of the shore in the direction that it came in.
Adds a slight random factor to the distance and angle it is reversed in.
"""
start_point = kwargs.pop('start_point')
hit_point = kwargs.pop('hit_point')
distance = kwargs.pop('distance')
azimuth = kwargs.pop('azimuth')
reverse_azimuth = kwargs.pop('reverse_azimuth')
reverse_distance = kwargs.get('reverse_distance', None)
if reverse_distance is None:
reverse_distance = 100
# Randomize the reverse angle slightly (+/- 5 degrees)
random_azimuth = reverse_azimuth + AsaRandom.random() * 5
count = 0
nudge_distance = 0.01
nudge_point = AsaGreatCircle.great_circle(distance=nudge_distance,
azimuth=reverse_azimuth,
start_point=hit_point)
nudge_loc = Location4D(latitude=nudge_point['latitude'],
longitude=nudge_point['longitude'],
depth=start_point.depth)
# Find point just offshore to do testing with. Try 15 times (~350m). This makes sure the start_point is in the water
# for the next call to intersect (next while loop).
while self.intersect(single_point=nudge_loc.point) and count < 16:
nudge_distance *= 2
nudge_point = AsaGreatCircle.great_circle(distance=nudge_distance,
azimuth=reverse_azimuth,
start_point=hit_point)
nudge_loc = Location4D(latitude=nudge_point['latitude'],
longitude=nudge_point['longitude'],
depth=start_point.depth)
count += 1
# We tried 16 times and couldn't find a point. This should totally never happen.
if count == 16:
logger.debug(
"WOW. Could not find location in water to do shoreline calculation with. Assuming particle did not move from original location"
)
return start_point
# Keep trying to throw particle back, halfing the distance each time until it is in water.
# Only half it 12 times before giving up and returning the point which the particle came from.
count = 0
# Distance amount to half each iteration
changing_distance = reverse_distance
new_point = AsaGreatCircle.great_circle(distance=reverse_distance,
azimuth=random_azimuth,
start_point=hit_point)
new_loc = Location4D(latitude=new_point['latitude'],
longitude=new_point['longitude'],
depth=start_point.depth)
while self.intersect(start_point=nudge_loc.point,
end_point=new_loc.point) and count < 12:
changing_distance /= 2
new_point = AsaGreatCircle.great_circle(distance=changing_distance,
azimuth=random_azimuth,
start_point=hit_point)
new_loc = Location4D(latitude=new_point['latitude'],
longitude=new_point['longitude'],
depth=start_point.depth)
count += 1
# We tried 10 times and the particle was still on shore, return the point the particle started from.
# No randomization.
if count == 12:
logger.debug(
"Could not react particle with shoreline. Assuming particle did not move from original location"
)
return start_point
return new_loc
def __reverse(self, **kwargs):
"""
Reverse particle just off of the shore in the direction that it came in.
Adds a slight random factor to the distance and angle it is reversed in.
"""
#st = time.clock()
start_point = kwargs.pop('start_point')
hit_point = kwargs.pop('hit_point')
reverse_azimuth = kwargs.pop('reverse_azimuth')
reverse_distance = kwargs.get('reverse_distance', None)
if reverse_distance is None:
reverse_distance = 100
# Randomize the reverse angle slightly (+/- 5 degrees)
random_azimuth = reverse_azimuth + AsaRandom.random() * 5
count = 0
nudge_distance = 0.01
nudge_point = AsaGreatCircle.great_circle(distance=nudge_distance,
azimuth=reverse_azimuth,
start_point=hit_point)
nudge_loc = Location4D(latitude=nudge_point['latitude'],
longitude=nudge_point['longitude'],
depth=start_point.depth)
# Find point just offshore to do testing with. Try 15 times (~350m). This makes sure the start_point is in the water
# for the next call to intersect (next while loop).
while self.intersect(single_point=nudge_loc.point) and count < 16:
nudge_distance *= 2
nudge_point = AsaGreatCircle.great_circle(distance=nudge_distance,
azimuth=reverse_azimuth,
start_point=hit_point)
nudge_loc = Location4D(latitude=nudge_point['latitude'],
longitude=nudge_point['longitude'],
depth=start_point.depth)
count += 1
# We tried 16 times and couldn't find a point. This should totally never happen.
if count == 16:
logger.warn(
"LOOK: Could not find location in water to do shoreline calculation with. Assuming particle did not move from original location"
)
return start_point
# Keep trying to throw particle back, halfing the distance each time until it is in water.
# Only half it 6 times before giving up and returning the point which the particle came from.
count = 0
# Distance amount to half each iteration
changing_distance = reverse_distance
new_point = AsaGreatCircle.great_circle(distance=reverse_distance,
azimuth=random_azimuth,
start_point=hit_point)
new_loc = Location4D(latitude=new_point['latitude'],
longitude=new_point['longitude'],
depth=start_point.depth)
# We don't want to reverse further than the current spatial buffer, because we will reindex the
# source file everytime we reverse, which will slow down the calculations considerably.
while (not self._spatial_query_object.contains(new_loc.point)
or self.intersect(start_point=nudge_loc.point,
end_point=new_loc.point)) and count < 6:
changing_distance /= 2
new_point = AsaGreatCircle.great_circle(distance=changing_distance,
azimuth=random_azimuth,
start_point=hit_point)
new_loc = Location4D(latitude=new_point['latitude'],
longitude=new_point['longitude'],
depth=start_point.depth)
count += 1
# We tried 10 times and the particle was still on shore, return the point the particle started from.
# No randomization.
if count == 6:
logger.warn(
"LOOK: Could not react particle with shoreline. Assuming particle did not move from original location"
)
return start_point
#logger.info("Reaction time: %f" % (time.clock() - st))
return new_loc
