def trajectory_from_dictionary(dictionary):
"""Returns a trajectory constructed from the given dictionary.
Args:
dictionary: the dictionary to convert into a trajectory
"""
#verify domain is valid and import appropriate domain
try:
domain = importlib.import_module("tracktable.domain."+
dictionary['domain'].lower())
except ImportError:
raise ValueError("Error: invalid domain name: "+dictionary['domain'].lower())
dimension = domain.DIMENSION
#verify each coordinate matches dimension
points = []
numPoints = len(dictionary['coordinates'])
for point in dictionary['coordinates']:
if len(point) != dimension:
raise ValueError("Error: point " + str(point) + " has "+ str(len(point)) + " coordinate(s), expected " + str(dimension)+".")
#verify point properties values lists are of equal length
for (name, attributes) in dictionary['point_properties'].items():
if len(attributes['values']) != numPoints:
raise ValueError("Error: "+name+" property has only " + str(len(attributes['values'])) + " values, but there are " + str(numPoints) + " points in the trajectory.")
#verify there are the right number of timestamps
if len(dictionary['timestamps']) != numPoints:
raise ValueError("Error: Only " + str(len(dictionary['timestamps'])) + " timestamp values, but there are " + str(numPoints) + " points in the trajectory.")
#verify object_id is a string
if not isinstance(dictionary['object_id'], str):
raise ValueError("Error: object_id must be a string, but got a value of type "+type(dictionary['object_id']).__name__)
#generate points / position list
for i in range(numPoints):
point = domain.TrajectoryPoint(dictionary['coordinates'][i])
point.object_id = dictionary['object_id']
point.timestamp = Timestamp.from_string(dictionary['timestamps'][i])
for (name, attributes) in dictionary['point_properties'].items():
if attributes['type'] == "datetime" or attributes['type'] == "timestamp": #okay to support both? todo
point.set_property(name, Timestamp.from_string(attributes['values'][i], format_string='%Y-%m-%d %H:%M:%S'))
else:
point.set_property(name, attributes['values'][i])
points.append(point)
#make trajectory
trajectory = domain.Trajectory.from_position_list(points)
#add trajectory properties
for (name, attributes) in dictionary['trajectory_properties'].items():
if attributes['type'] == "datetime" or attributes['type'] == "timestamp": #okay to support both? todo
trajectory.set_property(name, Timestamp.from_string(attributes['value'], format_string='%Y-%m-%d %H:%M:%S'))
else:
trajectory.set_property(name, attributes['value'])
return trajectory
def test_no_time_zone_iso(self):
timestring = '2014-12-25T13:12:45'
parsed_timestamp = Timestamp.from_string(timestring)
constructed_timestamp = datetime(2014, 12, 25,
hour=13, minute=12, second=45,
tzinfo=pytz.utc)
self.assertTrue(parsed_timestamp.tzinfo is not None)
self.assertTrue(parsed_timestamp == constructed_timestamp)
def test_with_time_zone_iso(self):
timestring = '2014-12-25T10:12:45-0300'
parsed_timestamp = Timestamp.from_string(
timestring,
format_string='%Y-%m-%dT%H:%M:%S%z')
constructed_timestamp = datetime(2014, 12, 25,
hour=13, minute=12, second=45,
tzinfo=pytz.utc)
self.assertTrue(parsed_timestamp.tzinfo is not None)
self.assertTrue(parsed_timestamp == constructed_timestamp)
def gen_json_and_trajectory(self):
domain = tracktable.domain.terrestrial
json = "{\"coordinates\": [[26.995, -81.9731], [27.0447, -81.9844], [27.1136, -82.0458]], \"domain\": \"terrestrial\", \"object_id\": \"AAA001\", \"point_properties\": {\"altitude\": {\"type\": \"int\", \"values\": [2700, 4200, 6700]}, \"heading\": {\"type\": \"float\", \"values\": [108.1, 108.2, 225.3]}, \"note\": {\"type\": \"str\", \"values\": [\"hello\", \"world\", \"!\"]}, \"time2\": {\"type\": \"datetime\", \"values\": [\"2004-01-01 00:00:01\", \"2004-01-01 00:00:02\", \"2004-01-01 00:00:03\"]}}, \"timestamps\": [\"2004-12-07 11:36:18\", \"2004-12-07 11:37:56\", \"2004-12-07 11:39:18\"], \"trajectory_properties\": {\"percent\": {\"type\": \"float\", \"value\": 33.333}, \"platform\": {\"type\": \"str\", \"value\": \"Boeing 747\"}, \"start\": {\"type\": \"datetime\", \"value\": \"2004-12-07 11:36:00\"}, \"tailNum\": {\"type\": \"int\", \"value\": 3878}}}"
# Manually set up a matching Trajectory object
p1 = domain.TrajectoryPoint()
p1[0] = 26.995
if domain.DIMENSION > 1:
p1[1] = -81.9731
if domain.DIMENSION > 2:
p1[2] = -100.0
p1.set_property('altitude', 2700)
p1.set_property('heading', 108.1)
p1.set_property('note', "hello")
p1.set_property('time2', Timestamp.from_string('2004-01-01 00:00:01'))
p1.object_id = 'AAA001'
p1.timestamp = Timestamp.from_string('2004-12-07 11:36:18',
format_string='%Y-%m-%d %H:%M:%S')
p2 = domain.TrajectoryPoint()
p2[0] = 27.0447
if domain.DIMENSION > 1:
p2[1] = -81.9844
if domain.DIMENSION > 2:
p2[2] = -101.0
p2.set_property('altitude', 4200)
p2.set_property('heading', 108.2)
p2.set_property('note', "world")
p2.set_property('time2', Timestamp.from_string('2004-01-01 00:00:02'))
p2.object_id = 'AAA001'
p2.timestamp = Timestamp.from_string('2004-12-07 11:37:56',
format_string='%Y-%m-%d %H:%M:%S')
p3 = domain.TrajectoryPoint()
p3[0] = 27.1136
if domain.DIMENSION > 1:
p3[1] = -82.0458
if domain.DIMENSION > 2:
p3[2] = -102.0
p3.set_property('altitude', 6700)
p3.set_property('heading', 225.3)
p3.set_property('note', "!")
p3.set_property('time2', Timestamp.from_string('2004-01-01 00:00:03'))
p3.object_id = 'AAA001'
p3.timestamp = Timestamp.from_string('2004-12-07 11:39:18',
format_string='%Y-%m-%d %H:%M:%S')
trajectory = domain.Trajectory.from_position_list([p1, p2, p3])
trajectory.set_property('percent', 33.333)
trajectory.set_property('platform', "Boeing 747")
trajectory.set_property('start',
Timestamp.from_string('2004-12-07 11:36:00'))
trajectory.set_property('tailNum', 3878)
return json, trajectory
def test_no_time_zone_iso(self):
timestring = '2014-12-25T13:12:45'
parsed_timestamp = Timestamp.from_string(timestring)
constructed_timestamp = datetime(2014,
12,
25,
hour=13,
minute=12,
second=45,
tzinfo=pytz.utc)
self.assertTrue(parsed_timestamp.tzinfo is not None)
self.assertTrue(parsed_timestamp == constructed_timestamp)
def test_with_time_zone_iso(self):
timestring = '2014-12-25T10:12:45-0300'
parsed_timestamp = Timestamp.from_string(
timestring, format_string='%Y-%m-%dT%H:%M:%S%z')
constructed_timestamp = datetime(2014,
12,
25,
hour=13,
minute=12,
second=45,
tzinfo=pytz.utc)
self.assertTrue(parsed_timestamp.tzinfo is not None)
self.assertTrue(parsed_timestamp == constructed_timestamp)
def gen_json_and_trajectory(self):
domain = tracktable.domain.terrestrial
json = "{\"coordinates\": [[26.995, -81.9731], [27.0447, -81.9844], [27.1136, -82.0458]], \"domain\": \"terrestrial\", \"object_id\": \"AAA001\", \"point_properties\": {\"altitude\": {\"type\": \"int\", \"values\": [2700, 4200, 6700]}, \"heading\": {\"type\": \"float\", \"values\": [108.1, 108.2, 225.3]}, \"note\": {\"type\": \"str\", \"values\": [\"hello\", \"world\", \"!\"]}, \"time2\": {\"type\": \"datetime\", \"values\": [\"2004-01-01 00:00:01\", \"2004-01-01 00:00:02\", \"2004-01-01 00:00:03\"]}}, \"timestamps\": [\"2004-12-07 11:36:18\", \"2004-12-07 11:37:56\", \"2004-12-07 11:39:18\"], \"trajectory_properties\": {\"percent\": {\"type\": \"float\", \"value\": 33.333}, \"platform\": {\"type\": \"str\", \"value\": \"Boeing 747\"}, \"start\": {\"type\": \"datetime\", \"value\": \"2004-12-07 11:36:00\"}, \"tailNum\": {\"type\": \"int\", \"value\": 3878}}}"
# Manually set up a matching Trajectory object
p1 = domain.TrajectoryPoint()
p1[0] = 26.995;
if domain.DIMENSION > 1:
p1[1] = -81.9731
if domain.DIMENSION > 2:
p1[2] = -100.0
p1.set_property('altitude', 2700)
p1.set_property('heading', 108.1)
p1.set_property('note', "hello")
p1.set_property('time2', Timestamp.from_string('2004-01-01 00:00:01'))
p1.object_id = 'AAA001'
p1.timestamp = Timestamp.from_string('2004-12-07 11:36:18', format_string='%Y-%m-%d %H:%M:%S')
p2 = domain.TrajectoryPoint()
p2[0] = 27.0447;
if domain.DIMENSION > 1:
p2[1] = -81.9844
if domain.DIMENSION > 2:
p2[2] = -101.0
p2.set_property('altitude', 4200)
p2.set_property('heading', 108.2)
p2.set_property('note', "world")
p2.set_property('time2', Timestamp.from_string('2004-01-01 00:00:02'))
p2.object_id = 'AAA001'
p2.timestamp = Timestamp.from_string('2004-12-07 11:37:56', format_string='%Y-%m-%d %H:%M:%S')
p3 = domain.TrajectoryPoint()
p3[0] = 27.1136;
if domain.DIMENSION > 1:
p3[1] = -82.0458
if domain.DIMENSION > 2:
p3[2] = -102.0
p3.set_property('altitude', 6700)
p3.set_property('heading', 225.3)
p3.set_property('note', "!")
p3.set_property('time2', Timestamp.from_string('2004-01-01 00:00:03'))
p3.object_id = 'AAA001'
p3.timestamp = Timestamp.from_string('2004-12-07 11:39:18', format_string='%Y-%m-%d %H:%M:%S')
trajectory = domain.Trajectory.from_position_list([p1,p2,p3])
trajectory.set_property('percent', 33.333)
trajectory.set_property('platform', "Boeing 747")
trajectory.set_property('start', Timestamp.from_string('2004-12-07 11:36:00'))
trajectory.set_property('tailNum', 3878)
return json, trajectory
def test_with_time_zone_iso(self):
if sys.version_info[0] == 3:
timestring = '2014-12-25T10:12:45-0300'
parsed_timestamp = Timestamp.from_string(
timestring, format_string='%Y-%m-%dT%H:%M:%S%z')
constructed_timestamp = datetime(2014,
12,
25,
hour=13,
minute=12,
second=45,
tzinfo=pytz.utc)
self.assertTrue(parsed_timestamp.tzinfo is not None)
self.assertTrue(parsed_timestamp == constructed_timestamp)
else:
print("Time zone parsing is only supported in Python 3")
self.assertTrue(True)
def gen_dictionary_and_trajectory(self, domainString):
domain = importlib.import_module("tracktable.domain." +
domainString.lower())
# Manually set up a dictionary which contains trajectory info
dictionary = {
'domain':
domainString.lower(),
'object_id':
'AAA001',
'trajectory_properties': {
'percent': {
'type': 'float',
'value': 33.333
},
'platform': {
'type': 'str',
'value': "Boeing 747"
},
'start': {
'type': 'datetime',
'value': "2004-12-07 11:36:00"
},
'tailNum': {
'type': 'str',
'value': '3878'
}
},
'timestamps': [
'2004-12-07 11:36:18', '2004-12-07 11:37:56',
'2004-12-07 11:39:18'
],
'point_properties': {
'altitude': {
'type': 'float',
'values': [2700, 4200, 6700]
},
'heading': {
'type': 'float',
'values': [108.1, 108.2, 225.3]
},
'note': {
'type': 'str',
'values': ["hello", "world", "!"]
},
'time2': {
'type':
'datetime',
'values': [
"2004-01-01 00:00:01", "2004-01-01 00:00:02",
"2004-01-01 00:00:03"
]
}
}
}
if domain.DIMENSION == 1:
dictionary.update(
{'coordinates': [(26.995), (27.0447), (27.1136)]})
if domain.DIMENSION == 2:
dictionary.update({
'coordinates': [(26.995, -81.9731), (27.0447, -81.9844),
(27.1136, -82.0458)]
})
if domain.DIMENSION == 3:
dictionary.update({
'coordinates': [(26.995, -81.9731, -100.0),
(27.0447, -81.9844, -101.0),
(27.1136, -82.0458, -102.0)]
})
# Manually set up a matching Trajectory object
p1 = domain.TrajectoryPoint()
p1[0] = 26.995
if domain.DIMENSION > 1:
p1[1] = -81.9731
if domain.DIMENSION > 2:
p1[2] = -100.0
p1.set_property('altitude', 2700)
p1.set_property('heading', 108.1)
p1.set_property('note', "hello")
p1.set_property('time2', Timestamp.from_string('2004-01-01 00:00:01'))
p1.object_id = 'AAA001'
p1.timestamp = Timestamp.from_string('2004-12-07 11:36:18',
format_string='%Y-%m-%d %H:%M:%S')
p2 = domain.TrajectoryPoint()
p2[0] = 27.0447
if domain.DIMENSION > 1:
p2[1] = -81.9844
if domain.DIMENSION > 2:
p2[2] = -101.0
p2.set_property('altitude', 4200)
p2.set_property('heading', 108.2)
p2.set_property('note', "world")
p2.set_property('time2', Timestamp.from_string('2004-01-01 00:00:02'))
p2.object_id = 'AAA001'
p2.timestamp = Timestamp.from_string('2004-12-07 11:37:56',
format_string='%Y-%m-%d %H:%M:%S')
p3 = domain.TrajectoryPoint()
p3[0] = 27.1136
if domain.DIMENSION > 1:
p3[1] = -82.0458
if domain.DIMENSION > 2:
p3[2] = -102.0
p3.set_property('altitude', 6700)
p3.set_property('heading', 225.3)
p3.set_property('note', "!")
p3.set_property('time2', Timestamp.from_string('2004-01-01 00:00:03'))
p3.object_id = 'AAA001'
p3.timestamp = Timestamp.from_string('2004-12-07 11:39:18',
format_string='%Y-%m-%d %H:%M:%S')
trajectory = domain.Trajectory.from_position_list([p1, p2, p3])
trajectory.set_property('percent', 33.333)
trajectory.set_property('platform', "Boeing 747")
trajectory.set_property('start',
Timestamp.from_string('2004-12-07 11:36:00'))
trajectory.set_property('tailNum', '3878')
return dictionary, trajectory
def gen_dictionary_and_trajectory(self, domainString):
domain = importlib.import_module("tracktable.domain."+domainString.lower())
# Manually set up a dictionary which contains trajectory info
dictionary = {'domain' : domainString.lower(),
'object_id' : 'AAA001',
'trajectory_properties' : {'percent' : {'type': 'float', 'value': 33.333},
'platform': {'type': 'str', 'value': "Boeing 747"},
'start' : {'type': 'datetime', 'value': "2004-12-07 11:36:00"},
'tailNum' : {'type': 'int', 'value': 3878}},
'timestamps' : ['2004-12-07 11:36:18',#-0000',
'2004-12-07 11:37:56',#-0000',
'2004-12-07 11:39:18'],#-0000'],
'point_properties' : {'altitude': {'type': 'int', 'values': [2700, 4200, 6700]},
'heading' : {'type': 'float', 'values': [108.1, 108.2, 225.3]},
'note' : {'type': 'str', 'values': ["hello", "world", "!"]},
'time2' : {'type': 'datetime', 'values': ["2004-01-01 00:00:01",
"2004-01-01 00:00:02",
"2004-01-01 00:00:03"]} }
}
if domain.DIMENSION == 1:
dictionary.update({'coordinates' : [(26.995), (27.0447), (27.1136)]})
if domain.DIMENSION == 2:
dictionary.update({'coordinates' : [(26.995, -81.9731), (27.0447, -81.9844), (27.1136, -82.0458)]})
if domain.DIMENSION == 3:
dictionary.update({'coordinates' : [(26.995, -81.9731, -100.0), (27.0447, -81.9844, -101.0), (27.1136, -82.0458, -102.0)]})
# Manually set up a matching Trajectory object
p1 = domain.TrajectoryPoint()
p1[0] = 26.995;
if domain.DIMENSION > 1:
p1[1] = -81.9731
if domain.DIMENSION > 2:
p1[2] = -100.0
p1.set_property('altitude', 2700)
p1.set_property('heading', 108.1)
p1.set_property('note', "hello")
p1.set_property('time2', Timestamp.from_string('2004-01-01 00:00:01'))
p1.object_id = 'AAA001'
p1.timestamp = Timestamp.from_string('2004-12-07 11:36:18', format_string='%Y-%m-%d %H:%M:%S')
p2 = domain.TrajectoryPoint()
p2[0] = 27.0447;
if domain.DIMENSION > 1:
p2[1] = -81.9844
if domain.DIMENSION > 2:
p2[2] = -101.0
p2.set_property('altitude', 4200)
p2.set_property('heading', 108.2)
p2.set_property('note', "world")
p2.set_property('time2', Timestamp.from_string('2004-01-01 00:00:02'))
p2.object_id = 'AAA001'
p2.timestamp = Timestamp.from_string('2004-12-07 11:37:56', format_string='%Y-%m-%d %H:%M:%S')
p3 = domain.TrajectoryPoint()
p3[0] = 27.1136;
if domain.DIMENSION > 1:
p3[1] = -82.0458
if domain.DIMENSION > 2:
p3[2] = -102.0
p3.set_property('altitude', 6700)
p3.set_property('heading', 225.3)
p3.set_property('note', "!")
p3.set_property('time2', Timestamp.from_string('2004-01-01 00:00:03'))
p3.object_id = 'AAA001'
p3.timestamp = Timestamp.from_string('2004-12-07 11:39:18', format_string='%Y-%m-%d %H:%M:%S')
trajectory = domain.Trajectory.from_position_list([p1,p2,p3])
trajectory.set_property('percent', 33.333)
trajectory.set_property('platform', "Boeing 747")
trajectory.set_property('start', Timestamp.from_string('2004-12-07 11:36:00'))
trajectory.set_property('tailNum', 3878)
return dictionary, trajectory
def run_test():
# Define three sets of points: ABQ to San Diego, San Diego to
# Seattle, Denver to NYC. ABQ->SAN->SEA should break into two
# trajectories because of a timestamp break in San Diego. The
# flight to Denver will begin right when the flight to Seattle
# ends so we expect to break that one based on the distance
# threshold.
print("Beginning run_test()")
from tracktable.domain.terrestrial import TrajectoryPoint
albuquerque = TrajectoryPoint( -106.5, 35.25 )
albuquerque.timestamp = Timestamp.from_string('2010-01-01 12:00:00')
albuquerque.object_id = 'flight1'
san_diego1 = TrajectoryPoint( -117.16, 32.67 )
san_diego1.timestamp = Timestamp.from_string('2010-01-01 15:00:00')
san_diego1.object_id = 'flight1'
san_diego2 = TrajectoryPoint( -117.16, 32.67 )
san_diego2.timestamp = Timestamp.from_string('2010-01-01 16:00:00')
san_diego2.object_id = 'flight1'
seattle = TrajectoryPoint( -122.31, 47.60 )
seattle.timestamp = Timestamp.from_string('2010-01-01 19:00:00')
seattle.object_id = 'flight1'
denver = TrajectoryPoint( -104.98, 39.79 )
denver.timestamp = Timestamp.from_string('2010-01-01 19:01:00')
denver.object_id = 'flight1'
new_york = TrajectoryPoint( -74.02, 40.71 )
new_york.timestamp = Timestamp.from_string('2010-01-02 00:00:00')
new_york.object_id = 'flight1'
# Now we want sequences of points for each flight.
abq_to_sd = TrajectoryPointSource()
abq_to_sd.start_point = albuquerque
abq_to_sd.end_point = san_diego1
abq_to_sd.num_points = 180
sd_to_sea = TrajectoryPointSource()
sd_to_sea.start_point = san_diego2
sd_to_sea.end_point = seattle
sd_to_sea.num_points = 360 # flying very slowly
denver_to_nyc = TrajectoryPointSource()
denver_to_nyc.start_point = denver
denver_to_nyc.end_point = new_york
denver_to_nyc.num_points = 600 # wow, very densely sampled
print("Done creating point sources")
all_points = list(itertools.chain( abq_to_sd.points(),
sd_to_sea.points(),
denver_to_nyc.points() ))
trajectory_assembler = AssembleTrajectoryFromPoints()
trajectory_assembler.input = all_points
trajectory_assembler.separation_time = timedelta(minutes=30)
trajectory_assembler.separation_distance = 100
trajectory_assembler_minimum_length = 10
print("Done instantiating assembler")
all_trajectories = list(trajectory_assembler.trajectories())
print("Assembler statistics: {} points, {} valid trajectories, {} invalid trajectories".format(
trajectory_assembler.valid_trajectory_count,
trajectory_assembler.invalid_trajectory_count,
trajectory_assembler.points_processed_count
))
print("Done creating trajectories. Found {}.".format(len(all_trajectories)))
test_point_proximity = geomath.sanity_check_distance_less_than(1)
def test_timestamp_proximity(time1, time2):
return ( (time2 - time1).total_seconds() < 1 )
error_count = 0
if len(all_trajectories) != 3:
sys.stdout.write('ERROR: test_trajectory_assembly: Expected 3 trajectories but got {}\n'.format(len(all_trajectories)))
error_count += 1
if not test_point_proximity(all_trajectories[0][0], albuquerque):
sys.stdout.write('ERROR: test_trajectory_assembly: Expected point 0 of first trajectory to be Albuquerque ({}) but it is instead {}\n'.format(albuquerque, str(all_trajectories[0][0])))
error_count += 1
if not test_point_proximity(all_trajectories[0][-1], san_diego1):
sys.stdout.write('ERROR: test_trajectory_assembly: Expected last point of first trajectory to be San Diego ({}) but it is instead {}\n'.format(san_diego, str(all_trajectories[0][-1])))
error_count += 1
if not test_point_proximity(all_trajectories[1][0], san_diego2):
sys.stdout.write('ERROR: test_trajectory_assembly: Expected point 0 of second trajectory to be San Diego ({}) but it is instead {}\n'.format(san_diego, str(all_trajectories[1][0])))
error_count += 1
if not test_point_proximity(all_trajectories[1][-1], seattle):
sys.stdout.write('ERROR: test_trajectory_assembly: Expected last point of second trajectory to be Seattle ({}) but it is instead {}\n'.format(seattle, str(all_trajectories[1][-1])))
error_count += 1
if not test_point_proximity(all_trajectories[2][0], denver):
sys.stdout.write('ERROR: test_trajectory_assembly: Expected first point of third trajectory to be Denver ({}) but it is instead {}\n'.format(denver, str(all_trajectories[2][0])))
error_count += 1
if not test_point_proximity(all_trajectories[2][-1], new_york):
sys.stdout.write('ERROR: test_trajectory_assembly: Expected last point of third trajectory to be New York ({}) but it is instead {}\n'.format(new_york, str(all_trajectories[2][-1])))
error_count += 1
if not test_timestamp_proximity(all_trajectories[0][0].timestamp, albuquerque.timestamp):
sys.stdout.write('ERROR: test_trajectory_assembly: Expected timestamp at beginning of trajectory 0 to be {} but it is instead {}\n'.format(albuquerque.timestamp, all_trajectories[0][0].timestamp))
error_count += 1
if not test_timestamp_proximity(all_trajectories[0][-1].timestamp, san_diego1.timestamp):
sys.stdout.write('ERROR: test_trajectory_assembly: Expected timestamp at end of trajectory 0 to be {} but it is instead {}\n'.format(san_diego1.timestamp, all_trajectories[0][-1].timestamp))
error_count += 1
if not test_timestamp_proximity(all_trajectories[1][0].timestamp, san_diego2.timestamp):
sys.stdout.write('ERROR: test_trajectory_assembly: Expected timestamp at beginning of trajectory 1 to be {} but it is instead {}\n'.format(san_diego2.timestamp, all_trajectories[1][0].timestamp))
error_count += 1
if not test_timestamp_proximity(all_trajectories[1][-1].timestamp, seattle.timestamp):
sys.stdout.write('ERROR: test_trajectory_assembly: Expected end at beginning of trajectory 1 to be {} but it is instead {}\n'.format(seattle.timestamp, all_trajectories[1][-1].timestamp))
error_count += 1
if not test_timestamp_proximity(all_trajectories[2][0].timestamp, denver.timestamp):
sys.stdout.write('ERROR: test_trajectory_assembly: Expected timestamp at beginning of trajectory 2 to be {} but it is instead {}\n'.format(denver.timestamp, all_trajectories[2][0].timestamp))
error_count += 1
if not test_timestamp_proximity(all_trajectories[2][-1].timestamp, new_york.timestamp):
sys.stdout.write('ERROR: test_trajectory_assembly: Expected timestamp at end of trajectory 2 to be {} but it is instead {}\n'.format(new_york.timestamp, all_trajectories[2][-1].timestamp))
error_count += 1
print("Done checking proximities")
return error_count