Trajectory Builder Example

Purpose: Sample code to assemble points into trajectories

When you read in points from a file, you need to build those points into trajectories. As we know, data can be noisy, therefore we want to filter our trajectories to have a minimum number of points and/or a certain time or distance between points in a trajectory. The trajectory builder does all of this.

Imports

from tracktable.domain.terrestrial import TrajectoryPointReader        # Read points from file
from tracktable.analysis.assemble_trajectories import AssembleTrajectoryFromPoints  # Turn points into trajectories
from tracktable.core import data_directory

import os.path
import pprint

Requirements: In order to use the trajectory builder, we need a source that gives us data points in time sequential order. As with before, we can use the Point Reader.

data_filename = os.path.join(data_directory(), 'SampleFlightsUS.csv')
inFile = open(data_filename, 'r')
reader = TrajectoryPointReader()
reader.input = inFile
reader.comment_character = '#'
reader.field_delimiter = ','
# Set columns for data we care about
reader.object_id_column = 0
reader.timestamp_column = 1
reader.coordinates[0] = 2
reader.coordinates[1] = 3
reader.set_real_field_column('Heading', 5)

Now that we have our points ready to be read, we need to create a builder to take those points and form trajectories.

For now, we are going to leave the parameters at default.

builder = AssembleTrajectoryFromPoints()
builder.input = reader
builder.minimum_length = 3                  # An example of how to set the minimum number of points for each trajectory. Default is 2.

That’s it! Now we can play with the trajectories. As before with the point reader by itself, no data is loaded until you interact with the data.

Let’s start with seeing how many trajectories we have. We can do this, and see what they look like by dumping the trajectories to a list.

traj = list(builder.trajectories())
print(len(traj))

INFO:tracktable.analysis.assemble_trajectoriesAssembleTrajectoryFromPoints:New trajectories will be declared after a separation of None distance units between two points or a time lapse of at least 0:30:00 (hours, minutes, seconds).
INFO:tracktable.analysis.assemble_trajectoriesAssembleTrajectoryFromPoints:Trajectories with fewer than 3 points will be discarded.
INFO:tracktable.analysis.assemble_trajectoriesAssembleTrajectoryFromPoints:Done assembling trajectories. 29 trajectories produced and 0 discarded for having fewer than 3 points.

29

Looking at our first trajectory, we can see all the points included. See how they are in time sequential order and share the same object_id, which is what we would expect from a trajectory.

print(*traj[0])

[JJJ010@ 2004-12-10 14:14:40: (-111.501, 47.3697) Properties: ( {Heading [real]: 134})] [JJJ010@ 2004-12-10 14:15:41: (-111.528, 47.3353) Properties: ( {Heading [real]: 134})] [JJJ010@ 2004-12-10 14:16:43: (-111.551, 47.3039) Properties: ( {Heading [real]: 118})] [JJJ010@ 2004-12-10 14:17:45: (-111.575, 47.2719) Properties: ( {Heading [real]: 121})] [JJJ010@ 2004-12-10 14:18:47: (-111.599, 47.2403) Properties: ( {Heading [real]: 120})] [JJJ010@ 2004-12-10 14:19:49: (-111.621, 47.2081) Properties: ( {Heading [real]: 120})] [JJJ010@ 2004-12-10 14:20:50: (-111.646, 47.1761) Properties: ( {Heading [real]: 124})] [JJJ010@ 2004-12-10 14:21:52: (-111.676, 47.1375) Properties: ( {Heading [real]: 147})] [JJJ010@ 2004-12-10 14:22:54: (-111.699, 47.1036) Properties: ( {Heading [real]: 126})] [JJJ010@ 2004-12-10 14:23:56: (-111.726, 47.0692) Properties: ( {Heading [real]: 132})] [JJJ010@ 2004-12-10 14:24:58: (-111.752, 47.0336) Properties: ( {Heading [real]: 134})] [JJJ010@ 2004-12-10 14:26:01: (-111.778, 46.9972) Properties: ( {Heading [real]: 135})] [JJJ010@ 2004-12-10 14:27:02: (-111.804, 46.9608) Properties: ( {Heading [real]: 139})] [JJJ010@ 2004-12-10 14:28:04: (-111.838, 46.9175) Properties: ( {Heading [real]: 166})] [JJJ010@ 2004-12-10 14:29:06: (-111.863, 46.8822) Properties: ( {Heading [real]: 132})] [JJJ010@ 2004-12-10 14:30:08: (-111.889, 46.8464) Properties: ( {Heading [real]: 135})] [JJJ010@ 2004-12-10 14:31:10: (-111.914, 46.8106) Properties: ( {Heading [real]: 134})] [JJJ010@ 2004-12-10 14:32:12: (-111.942, 46.7742) Properties: ( {Heading [real]: 139})] [JJJ010@ 2004-12-10 14:33:14: (-111.967, 46.7386) Properties: ( {Heading [real]: 133})] [JJJ010@ 2004-12-10 14:34:16: (-112.001, 46.6944) Properties: ( {Heading [real]: 169})] [JJJ010@ 2004-12-10 14:35:18: (-112.025, 46.6581) Properties: ( {Heading [real]: 135})] [JJJ010@ 2004-12-10 14:36:20: (-112.052, 46.6211) Properties: ( {Heading [real]: 140})] [JJJ010@ 2004-12-10 14:37:22: (-112.08, 46.5833) Properties: ( {Heading [real]: 143})] [JJJ010@ 2004-12-10 14:38:24: (-112.108, 46.5439) Properties: ( {Heading [real]: 148})] [JJJ010@ 2004-12-10 14:39:26: (-112.134, 46.5067) Properties: ( {Heading [real]: 139})] [JJJ010@ 2004-12-10 14:40:28: (-112.165, 46.4619) Properties: ( {Heading [real]: 168})] [JJJ010@ 2004-12-10 14:41:30: (-112.194, 46.4228) Properties: ( {Heading [real]: 148})] [JJJ010@ 2004-12-10 14:42:32: (-112.232, 46.3742) Properties: ( {Heading [real]: 187})] [JJJ010@ 2004-12-10 14:43:34: (-112.267, 46.3225) Properties: ( {Heading [real]: 193})] [JJJ010@ 2004-12-10 14:44:36: (-112.305, 46.2683) Properties: ( {Heading [real]: 204})] [JJJ010@ 2004-12-10 14:45:38: (-112.355, 46.2008) Properties: ( {Heading [real]: 257})] [JJJ010@ 2004-12-10 14:46:40: (-112.395, 46.1428) Properties: ( {Heading [real]: 217})] [JJJ010@ 2004-12-10 14:47:42: (-112.436, 46.0844) Properties: ( {Heading [real]: 220})] [JJJ010@ 2004-12-10 14:48:44: (-112.478, 46.0267) Properties: ( {Heading [real]: 219})] [JJJ010@ 2004-12-10 14:49:46: (-112.518, 45.9681) Properties: ( {Heading [real]: 219})] [JJJ010@ 2004-12-10 14:50:48: (-112.56, 45.9083) Properties: ( {Heading [real]: 225})] [JJJ010@ 2004-12-10 14:51:50: (-112.61, 45.8383) Properties: ( {Heading [real]: 264})] [JJJ010@ 2004-12-10 14:52:52: (-112.653, 45.7808) Properties: ( {Heading [real]: 219})] [JJJ010@ 2004-12-10 14:53:54: (-112.693, 45.72) Properties: ( {Heading [real]: 226})] [JJJ010@ 2004-12-10 14:54:56: (-112.719, 45.655) Properties: ( {Heading [real]: 228})] [JJJ010@ 2004-12-10 14:55:58: (-112.632, 45.6189) Properties: ( {Heading [real]: 239})] [JJJ010@ 2004-12-10 14:57:00: (-112.563, 45.5775) Properties: ( {Heading [real]: 215})] [JJJ010@ 2004-12-10 14:58:02: (-112.652, 45.5803) Properties: ( {Heading [real]: 211})] [JJJ010@ 2004-12-10 14:59:04: (-112.719, 45.6153) Properties: ( {Heading [real]: 198})] [JJJ010@ 2004-12-10 15:00:07: (-112.721, 45.6864) Properties: ( {Heading [real]: 237})] [JJJ010@ 2004-12-10 15:01:09: (-112.721, 45.7581) Properties: ( {Heading [real]: 242})] [JJJ010@ 2004-12-10 15:02:11: (-112.724, 45.8308) Properties: ( {Heading [real]: 246})] [JJJ010@ 2004-12-10 15:03:14: (-112.727, 45.9019) Properties: ( {Heading [real]: 237})] [JJJ010@ 2004-12-10 15:04:15: (-112.729, 45.9744) Properties: ( {Heading [real]: 249})] [JJJ010@ 2004-12-10 15:05:17: (-112.731, 46.0644) Properties: ( {Heading [real]: 305})] [JJJ010@ 2004-12-10 15:07:21: (-112.737, 46.2106) Properties: ( {Heading [real]: 247})] [JJJ010@ 2004-12-10 15:08:23: (-112.74, 46.2847) Properties: ( {Heading [real]: 251})] [JJJ010@ 2004-12-10 15:09:25: (-112.739, 46.3592) Properties: ( {Heading [real]: 252})] [JJJ010@ 2004-12-10 15:10:27: (-112.742, 46.4308) Properties: ( {Heading [real]: 242})] [JJJ010@ 2004-12-10 15:11:29: (-112.746, 46.5192) Properties: ( {Heading [real]: 299})] [JJJ010@ 2004-12-10 15:12:31: (-112.747, 46.5933) Properties: ( {Heading [real]: 251})] [JJJ010@ 2004-12-10 15:13:33: (-112.75, 46.6672) Properties: ( {Heading [real]: 250})] [JJJ010@ 2004-12-10 15:14:35: (-112.753, 46.7411) Properties: ( {Heading [real]: 250})] [JJJ010@ 2004-12-10 15:15:37: (-112.756, 46.815) Properties: ( {Heading [real]: 250})] [JJJ010@ 2004-12-10 15:16:39: (-112.757, 46.8894) Properties: ( {Heading [real]: 252})] [JJJ010@ 2004-12-10 15:17:41: (-112.759, 46.98) Properties: ( {Heading [real]: 307})] [JJJ010@ 2004-12-10 15:18:43: (-112.762, 47.0536) Properties: ( {Heading [real]: 249})] [JJJ010@ 2004-12-10 15:19:45: (-112.764, 47.1294) Properties: ( {Heading [real]: 256})] [JJJ010@ 2004-12-10 15:20:47: (-112.767, 47.2031) Properties: ( {Heading [real]: 249})] [JJJ010@ 2004-12-10 15:21:49: (-112.769, 47.2778) Properties: ( {Heading [real]: 253})] [JJJ010@ 2004-12-10 15:22:51: (-112.8, 47.3469) Properties: ( {Heading [real]: 244})] [JJJ010@ 2004-12-10 15:23:53: (-112.868, 47.3569) Properties: ( {Heading [real]: 159})] [JJJ010@ 2004-12-10 15:24:55: (-112.89, 47.2806) Properties: ( {Heading [real]: 263})] [JJJ010@ 2004-12-10 15:25:57: (-112.888, 47.2086) Properties: ( {Heading [real]: 244})] [JJJ010@ 2004-12-10 15:26:59: (-112.885, 47.1372) Properties: ( {Heading [real]: 242})] [JJJ010@ 2004-12-10 15:28:01: (-112.882, 47.0672) Properties: ( {Heading [real]: 237})] [JJJ010@ 2004-12-10 15:29:03: (-112.881, 46.9956) Properties: ( {Heading [real]: 242})] [JJJ010@ 2004-12-10 15:30:05: (-112.878, 46.91) Properties: ( {Heading [real]: 290})] [JJJ010@ 2004-12-10 15:31:07: (-112.875, 46.8381) Properties: ( {Heading [real]: 243})] [JJJ010@ 2004-12-10 15:32:09: (-112.873, 46.7658) Properties: ( {Heading [real]: 245})] [JJJ010@ 2004-12-10 15:33:11: (-112.871, 46.6947) Properties: ( {Heading [real]: 240})] [JJJ010@ 2004-12-10 15:34:14: (-112.868, 46.6236) Properties: ( {Heading [real]: 237})] [JJJ010@ 2004-12-10 15:35:16: (-112.866, 46.5511) Properties: ( {Heading [real]: 245})] [JJJ010@ 2004-12-10 15:36:18: (-112.863, 46.4653) Properties: ( {Heading [real]: 290})] [JJJ010@ 2004-12-10 15:37:20: (-112.861, 46.3992) Properties: ( {Heading [real]: 224})] [JJJ010@ 2004-12-10 15:38:22: (-112.86, 46.3133) Properties: ( {Heading [real]: 291})] [JJJ010@ 2004-12-10 15:39:24: (-112.856, 46.2414) Properties: ( {Heading [real]: 243})] [JJJ010@ 2004-12-10 15:40:26: (-112.853, 46.1703) Properties: ( {Heading [real]: 241})] [JJJ010@ 2004-12-10 15:41:28: (-112.851, 46.0969) Properties: ( {Heading [real]: 248})] [JJJ010@ 2004-12-10 15:42:30: (-112.849, 46.0253) Properties: ( {Heading [real]: 242})] [JJJ010@ 2004-12-10 15:43:32: (-112.845, 45.9528) Properties: ( {Heading [real]: 245})] [JJJ010@ 2004-12-10 15:44:34: (-112.842, 45.8672) Properties: ( {Heading [real]: 290})] [JJJ010@ 2004-12-10 15:45:36: (-112.841, 45.7947) Properties: ( {Heading [real]: 245})] [JJJ010@ 2004-12-10 15:46:38: (-112.838, 45.7231) Properties: ( {Heading [real]: 242})] [JJJ010@ 2004-12-10 15:47:40: (-112.837, 45.6506) Properties: ( {Heading [real]: 245})] [JJJ010@ 2004-12-10 15:48:42: (-112.876, 45.5911) Properties: ( {Heading [real]: 221})] [JJJ010@ 2004-12-10 15:49:44: (-112.94, 45.5817) Properties: ( {Heading [real]: 155})] [JJJ010@ 2004-12-10 15:50:46: (-112.951, 45.6711) Properties: ( {Heading [real]: 304})] [JJJ010@ 2004-12-10 15:51:48: (-112.952, 45.7472) Properties: ( {Heading [real]: 257})] [JJJ010@ 2004-12-10 15:52:50: (-112.955, 45.8225) Properties: ( {Heading [real]: 255})] [JJJ010@ 2004-12-10 15:53:52: (-112.958, 45.8983) Properties: ( {Heading [real]: 256})] [JJJ010@ 2004-12-10 15:54:54: (-112.962, 45.9736) Properties: ( {Heading [real]: 255})] [JJJ010@ 2004-12-10 15:55:56: (-112.963, 46.0497) Properties: ( {Heading [real]: 257})] [JJJ010@ 2004-12-10 15:56:58: (-112.965, 46.1253) Properties: ( {Heading [real]: 256})] [JJJ010@ 2004-12-10 15:58:00: (-112.97, 46.215) Properties: ( {Heading [real]: 304})] [JJJ010@ 2004-12-10 15:59:02: (-112.973, 46.2908) Properties: ( {Heading [real]: 256})] [JJJ010@ 2004-12-10 16:00:04: (-112.973, 46.3686) Properties: ( {Heading [real]: 263})] [JJJ010@ 2004-12-10 16:01:06: (-112.977, 46.4481) Properties: ( {Heading [real]: 269})] [JJJ010@ 2004-12-10 16:02:08: (-112.98, 46.5233) Properties: ( {Heading [real]: 254})] [JJJ010@ 2004-12-10 16:03:10: (-112.982, 46.6003) Properties: ( {Heading [real]: 260})] [JJJ010@ 2004-12-10 16:04:12: (-112.986, 46.6764) Properties: ( {Heading [real]: 258})] [JJJ010@ 2004-12-10 16:05:14: (-112.989, 46.7619) Properties: ( {Heading [real]: 289})] [JJJ010@ 2004-12-10 16:07:18: (-112.994, 46.9122) Properties: ( {Heading [real]: 254})] [JJJ010@ 2004-12-10 16:08:21: (-112.997, 46.9878) Properties: ( {Heading [real]: 252})] [JJJ010@ 2004-12-10 16:09:23: (-112.999, 47.0633) Properties: ( {Heading [real]: 255})] [JJJ010@ 2004-12-10 16:10:25: (-113.003, 47.1539) Properties: ( {Heading [real]: 307})] [JJJ010@ 2004-12-10 16:11:27: (-113.006, 47.2294) Properties: ( {Heading [real]: 255})] [JJJ010@ 2004-12-10 16:12:29: (-113.025, 47.2992) Properties: ( {Heading [real]: 240})] [JJJ010@ 2004-12-10 16:13:31: (-113.109, 47.315) Properties: ( {Heading [real]: 200})] [JJJ010@ 2004-12-10 16:14:33: (-113.193, 47.3242) Properties: ( {Heading [real]: 195})] [JJJ010@ 2004-12-10 16:15:35: (-113.28, 47.3344) Properties: ( {Heading [real]: 202})] [JJJ010@ 2004-12-10 16:16:37: (-113.383, 47.3469) Properties: ( {Heading [real]: 240})] [JJJ010@ 2004-12-10 16:17:39: (-113.469, 47.3544) Properties: ( {Heading [real]: 199})] [JJJ010@ 2004-12-10 16:18:41: (-113.557, 47.36) Properties: ( {Heading [real]: 202})] [JJJ010@ 2004-12-10 16:19:43: (-113.642, 47.3656) Properties: ( {Heading [real]: 196})] [JJJ010@ 2004-12-10 16:20:45: (-113.685, 47.3128) Properties: ( {Heading [real]: 204})] [JJJ010@ 2004-12-10 16:21:47: (-113.682, 47.2422) Properties: ( {Heading [real]: 239})] [JJJ010@ 2004-12-10 16:22:49: (-113.678, 47.1578) Properties: ( {Heading [real]: 286})] [JJJ010@ 2004-12-10 16:23:51: (-113.675, 47.0861) Properties: ( {Heading [real]: 243})] [JJJ010@ 2004-12-10 16:24:53: (-113.671, 47.015) Properties: ( {Heading [real]: 241})] [JJJ010@ 2004-12-10 16:25:55: (-113.667, 46.9433) Properties: ( {Heading [real]: 243})] [JJJ010@ 2004-12-10 16:27:59: (-113.661, 46.8) Properties: ( {Heading [real]: 242})] [JJJ010@ 2004-12-10 16:29:01: (-113.656, 46.7125) Properties: ( {Heading [real]: 296})] [JJJ010@ 2004-12-10 16:30:03: (-113.653, 46.6422) Properties: ( {Heading [real]: 238})] [JJJ010@ 2004-12-10 16:31:05: (-113.649, 46.57) Properties: ( {Heading [real]: 244})] [JJJ010@ 2004-12-10 16:32:07: (-113.646, 46.4992) Properties: ( {Heading [real]: 240})] [JJJ010@ 2004-12-10 16:33:09: (-113.642, 46.4281) Properties: ( {Heading [real]: 241})] [JJJ010@ 2004-12-10 16:34:11: (-113.64, 46.3569) Properties: ( {Heading [real]: 241})] [JJJ010@ 2004-12-10 16:35:13: (-113.635, 46.2711) Properties: ( {Heading [real]: 290})] [JJJ010@ 2004-12-10 16:36:15: (-113.632, 46.2) Properties: ( {Heading [real]: 241})] [JJJ010@ 2004-12-10 16:37:17: (-113.63, 46.1219) Properties: ( {Heading [real]: 264})] [JJJ010@ 2004-12-10 16:38:19: (-113.626, 46.0506) Properties: ( {Heading [real]: 241})] [JJJ010@ 2004-12-10 16:39:21: (-113.623, 45.9797) Properties: ( {Heading [real]: 240})] [JJJ010@ 2004-12-10 16:40:24: (-113.619, 45.9078) Properties: ( {Heading [real]: 239})] [JJJ010@ 2004-12-10 16:41:26: (-113.616, 45.8356) Properties: ( {Heading [real]: 244})] [JJJ010@ 2004-12-10 16:42:28: (-113.612, 45.7631) Properties: ( {Heading [real]: 245})] [JJJ010@ 2004-12-10 16:43:27: (-113.608, 45.6769) Properties: ( {Heading [real]: 307})] [JJJ010@ 2004-12-10 16:44:32: (-113.556, 45.6172) Properties: ( {Heading [real]: 225})] [JJJ010@ 2004-12-10 16:45:34: (-113.477, 45.6708) Properties: ( {Heading [real]: 260})] [JJJ010@ 2004-12-10 16:46:36: (-113.401, 45.6414) Properties: ( {Heading [real]: 205})] [JJJ010@ 2004-12-10 16:47:38: (-113.329, 45.6028) Properties: ( {Heading [real]: 215})] [JJJ010@ 2004-12-10 16:48:40: (-113.215, 45.6303) Properties: ( {Heading [real]: 285})] [JJJ010@ 2004-12-10 16:49:42: (-113.072, 45.6603) Properties: ( {Heading [real]: 353})] [JJJ010@ 2004-12-10 16:50:44: (-112.951, 45.6878) Properties: ( {Heading [real]: 301})] [JJJ010@ 2004-12-10 16:51:46: (-112.83, 45.7164) Properties: ( {Heading [real]: 302})] [JJJ010@ 2004-12-10 16:52:48: (-112.706, 45.7422) Properties: ( {Heading [real]: 306})] [JJJ010@ 2004-12-10 16:53:50: (-112.584, 45.7708) Properties: ( {Heading [real]: 304})] [JJJ010@ 2004-12-10 16:54:52: (-112.459, 45.7972) Properties: ( {Heading [real]: 308})] [JJJ010@ 2004-12-10 16:55:54: (-112.335, 45.8244) Properties: ( {Heading [real]: 307})] [JJJ010@ 2004-12-10 16:56:56: (-112.187, 45.8569) Properties: ( {Heading [real]: 366})] [JJJ010@ 2004-12-10 16:57:58: (-112.065, 45.8853) Properties: ( {Heading [real]: 303})] [JJJ010@ 2004-12-10 16:59:00: (-111.94, 45.9106) Properties: ( {Heading [real]: 307})] [JJJ010@ 2004-12-10 17:00:02: (-111.816, 45.9392) Properties: ( {Heading [real]: 307})] [JJJ010@ 2004-12-10 17:01:04: (-111.692, 45.9661) Properties: ( {Heading [real]: 306})] [JJJ010@ 2004-12-10 17:02:06: (-111.568, 45.9936) Properties: ( {Heading [real]: 306})] [JJJ010@ 2004-12-10 17:03:08: (-111.442, 46.0231) Properties: ( {Heading [real]: 312})] [JJJ010@ 2004-12-10 17:04:10: (-111.291, 46.0558) Properties: ( {Heading [real]: 372})] [JJJ010@ 2004-12-10 17:05:12: (-111.165, 46.0853) Properties: ( {Heading [real]: 312})] [JJJ010@ 2004-12-10 17:07:17: (-111.071, 46.0042) Properties: ( {Heading [real]: 174})] [JJJ010@ 2004-12-10 17:08:19: (-110.966, 45.9964) Properties: ( {Heading [real]: 248})] [JJJ010@ 2004-12-10 17:16:35: (-110.918, 46.5919) Properties: ( {Heading [real]: 252})] [JJJ010@ 2004-12-10 17:17:37: (-110.918, 46.6658) Properties: ( {Heading [real]: 250})] [JJJ010@ 2004-12-10 17:18:39: (-110.919, 46.755) Properties: ( {Heading [real]: 302})] [JJJ010@ 2004-12-10 17:19:41: (-110.918, 46.8286) Properties: ( {Heading [real]: 249})] [JJJ010@ 2004-12-10 17:20:43: (-110.918, 46.9022) Properties: ( {Heading [real]: 249})] [JJJ010@ 2004-12-10 17:21:45: (-110.919, 46.9756) Properties: ( {Heading [real]: 248})] [JJJ010@ 2004-12-10 17:22:47: (-110.918, 47.0489) Properties: ( {Heading [real]: 248})] [JJJ010@ 2004-12-10 17:23:49: (-110.918, 47.1222) Properties: ( {Heading [real]: 248})] [JJJ010@ 2004-12-10 17:24:51: (-110.915, 47.2094) Properties: ( {Heading [real]: 295})] [JJJ010@ 2004-12-10 17:25:53: (-110.934, 47.2747) Properties: ( {Heading [real]: 225})] [JJJ010@ 2004-12-10 17:26:55: (-110.994, 47.2997) Properties: ( {Heading [real]: 161})] [JJJ010@ 2004-12-10 17:27:57: (-111.04, 47.245) Properties: ( {Heading [real]: 213})] [JJJ010@ 2004-12-10 17:28:59: (-111.041, 47.1714) Properties: ( {Heading [real]: 249})] [JJJ010@ 2004-12-10 17:30:02: (-111.043, 47.0975) Properties: ( {Heading [real]: 246})] [JJJ010@ 2004-12-10 17:31:04: (-111.041, 47.0106) Properties: ( {Heading [real]: 294})] [JJJ010@ 2004-12-10 17:32:06: (-111.043, 46.9372) Properties: ( {Heading [real]: 248})] [JJJ010@ 2004-12-10 17:33:08: (-111.043, 46.8642) Properties: ( {Heading [real]: 247})] [JJJ010@ 2004-12-10 17:34:10: (-111.044, 46.7908) Properties: ( {Heading [real]: 248})] [JJJ010@ 2004-12-10 17:35:12: (-111.043, 46.7167) Properties: ( {Heading [real]: 251})] [JJJ010@ 2004-12-10 17:36:14: (-111.039, 46.6444) Properties: ( {Heading [real]: 245})] [JJJ010@ 2004-12-10 17:37:16: (-111.039, 46.5558) Properties: ( {Heading [real]: 300})] [JJJ010@ 2004-12-10 17:38:19: (-111.039, 46.4817) Properties: ( {Heading [real]: 247})] [JJJ010@ 2004-12-10 17:39:20: (-111.041, 46.41) Properties: ( {Heading [real]: 247})] [JJJ010@ 2004-12-10 17:40:22: (-111.041, 46.3336) Properties: ( {Heading [real]: 258})] [JJJ010@ 2004-12-10 17:41:24: (-111.041, 46.2617) Properties: ( {Heading [real]: 243})] [JJJ010@ 2004-12-10 17:42:26: (-111.04, 46.1878) Properties: ( {Heading [real]: 250})] [JJJ010@ 2004-12-10 17:43:28: (-111.079, 46.1136) Properties: ( {Heading [real]: 267})] [JJJ010@ 2004-12-10 17:44:30: (-111.138, 46.0719) Properties: ( {Heading [real]: 197})] [JJJ010@ 2004-12-10 17:45:32: (-111.155, 46.1308) Properties: ( {Heading [real]: 203})] [JJJ010@ 2004-12-10 17:46:34: (-111.161, 46.2008) Properties: ( {Heading [real]: 237})] [JJJ010@ 2004-12-10 17:47:36: (-111.16, 46.275) Properties: ( {Heading [real]: 251})] [JJJ010@ 2004-12-10 17:48:38: (-111.16, 46.3489) Properties: ( {Heading [real]: 250})] [JJJ010@ 2004-12-10 17:49:40: (-111.162, 46.4378) Properties: ( {Heading [real]: 301})] [JJJ010@ 2004-12-10 17:50:42: (-111.16, 46.5083) Properties: ( {Heading [real]: 238})] [JJJ010@ 2004-12-10 17:51:44: (-111.161, 46.5806) Properties: ( {Heading [real]: 245})] [JJJ010@ 2004-12-10 17:52:46: (-111.161, 46.6517) Properties: ( {Heading [real]: 240})] [JJJ010@ 2004-12-10 17:53:48: (-111.163, 46.7253) Properties: ( {Heading [real]: 249})] [JJJ010@ 2004-12-10 17:54:50: (-111.163, 46.7989) Properties: ( {Heading [real]: 249})] [JJJ010@ 2004-12-10 17:55:52: (-111.162, 46.8892) Properties: ( {Heading [real]: 306})] [JJJ010@ 2004-12-10 17:56:54: (-111.162, 46.9636) Properties: ( {Heading [real]: 252})] [JJJ010@ 2004-12-10 17:57:56: (-111.163, 47.04) Properties: ( {Heading [real]: 258})] [JJJ010@ 2004-12-10 17:58:59: (-111.162, 47.1131) Properties: ( {Heading [real]: 243})] [JJJ010@ 2004-12-10 18:01:03: (-111.202, 47.2375) Properties: ( {Heading [real]: 215})] [JJJ010@ 2004-12-10 18:02:05: (-111.275, 47.1861) Properties: ( {Heading [real]: 242})] [JJJ010@ 2004-12-10 18:03:07: (-111.28, 47.1131) Properties: ( {Heading [real]: 247})] [JJJ010@ 2004-12-10 18:04:09: (-111.279, 47.0411) Properties: ( {Heading [real]: 244})] [JJJ010@ 2004-12-10 18:05:11: (-111.279, 46.9675) Properties: ( {Heading [real]: 249})] [JJJ010@ 2004-12-10 18:07:15: (-111.278, 46.8211) Properties: ( {Heading [real]: 248})] [JJJ010@ 2004-12-10 18:08:17: (-111.278, 46.7331) Properties: ( {Heading [real]: 298})] [JJJ010@ 2004-12-10 18:09:19: (-111.276, 46.6594) Properties: ( {Heading [real]: 249})] [JJJ010@ 2004-12-10 18:10:21: (-111.276, 46.5864) Properties: ( {Heading [real]: 247})] [JJJ010@ 2004-12-10 18:11:23: (-111.275, 46.5131) Properties: ( {Heading [real]: 248})] [JJJ010@ 2004-12-10 18:12:25: (-111.275, 46.4344) Properties: ( {Heading [real]: 266})] [JJJ010@ 2004-12-10 18:13:27: (-111.275, 46.3592) Properties: ( {Heading [real]: 254})] [JJJ010@ 2004-12-10 18:14:29: (-111.275, 46.2842) Properties: ( {Heading [real]: 254})] [JJJ010@ 2004-12-10 18:15:31: (-111.274, 46.1958) Properties: ( {Heading [real]: 299})] [JJJ010@ 2004-12-10 18:16:33: (-111.273, 46.1214) Properties: ( {Heading [real]: 252})] [JJJ010@ 2004-12-10 18:17:35: (-111.274, 46.0475) Properties: ( {Heading [real]: 250})] [JJJ010@ 2004-12-10 18:18:37: (-111.274, 45.9725) Properties: ( {Heading [real]: 254})] [JJJ010@ 2004-12-10 18:19:39: (-111.274, 45.8992) Properties: ( {Heading [real]: 248})] [JJJ010@ 2004-12-10 18:20:41: (-111.321, 45.8253) Properties: ( {Heading [real]: 273})] [JJJ010@ 2004-12-10 18:21:43: (-111.38, 45.8469) Properties: ( {Heading [real]: 157})] [JJJ010@ 2004-12-10 18:22:45: (-111.388, 45.9183) Properties: ( {Heading [real]: 242})] [JJJ010@ 2004-12-10 18:23:47: (-111.386, 45.9919) Properties: ( {Heading [real]: 249})] [JJJ010@ 2004-12-10 18:24:49: (-111.386, 46.0661) Properties: ( {Heading [real]: 251})] [JJJ010@ 2004-12-10 18:25:51: (-111.387, 46.14) Properties: ( {Heading [real]: 250})] [JJJ010@ 2004-12-10 18:26:53: (-111.388, 46.2131) Properties: ( {Heading [real]: 247})] [JJJ010@ 2004-12-10 18:27:55: (-111.387, 46.3017) Properties: ( {Heading [real]: 300})] [JJJ010@ 2004-12-10 18:28:58: (-111.389, 46.3775) Properties: ( {Heading [real]: 252})] [JJJ010@ 2004-12-10 18:30:00: (-111.388, 46.445) Properties: ( {Heading [real]: 228})] [JJJ010@ 2004-12-10 18:31:02: (-111.388, 46.5206) Properties: ( {Heading [real]: 256})] [JJJ010@ 2004-12-10 18:32:04: (-111.389, 46.61) Properties: ( {Heading [real]: 302})] [JJJ010@ 2004-12-10 18:33:06: (-111.389, 46.6844) Properties: ( {Heading [real]: 252})] [JJJ010@ 2004-12-10 18:34:08: (-111.391, 46.7603) Properties: ( {Heading [real]: 257})] [JJJ010@ 2004-12-10 18:35:10: (-111.391, 46.8347) Properties: ( {Heading [real]: 252})] [JJJ010@ 2004-12-10 18:36:12: (-111.392, 46.9081) Properties: ( {Heading [real]: 248})] [JJJ010@ 2004-12-10 18:37:14: (-111.393, 46.9819) Properties: ( {Heading [real]: 250})] [JJJ010@ 2004-12-10 18:38:16: (-111.393, 47.0717) Properties: ( {Heading [real]: 304})] [JJJ010@ 2004-12-10 18:39:18: (-111.393, 47.1461) Properties: ( {Heading [real]: 252})] [JJJ010@ 2004-12-10 18:40:20: (-111.428, 47.2106) Properties: ( {Heading [real]: 232})] [JJJ010@ 2004-12-10 18:41:22: (-111.491, 47.2411) Properties: ( {Heading [real]: 178})] [JJJ010@ 2004-12-10 18:42:24: (-111.518, 47.1778) Properties: ( {Heading [real]: 223})] [JJJ010@ 2004-12-10 18:43:26: (-111.516, 47.1044) Properties: ( {Heading [real]: 248})] [JJJ010@ 2004-12-10 18:44:28: (-111.515, 47.0175) Properties: ( {Heading [real]: 294})] [JJJ010@ 2004-12-10 18:45:30: (-111.517, 46.9467) Properties: ( {Heading [real]: 239})] [JJJ010@ 2004-12-10 18:46:32: (-111.515, 46.8753) Properties: ( {Heading [real]: 242})] [JJJ010@ 2004-12-10 18:47:34: (-111.514, 46.8036) Properties: ( {Heading [real]: 242})] [JJJ010@ 2004-12-10 18:48:36: (-111.514, 46.73) Properties: ( {Heading [real]: 249})] [JJJ010@ 2004-12-10 18:49:38: (-111.514, 46.6567) Properties: ( {Heading [real]: 248})] [JJJ010@ 2004-12-10 18:50:40: (-111.512, 46.5697) Properties: ( {Heading [real]: 294})] [JJJ010@ 2004-12-10 18:51:42: (-111.512, 46.4958) Properties: ( {Heading [real]: 250})] [JJJ010@ 2004-12-10 18:52:45: (-111.51, 46.4261) Properties: ( {Heading [real]: 232})] [JJJ010@ 2004-12-10 18:53:47: (-111.511, 46.3392) Properties: ( {Heading [real]: 294})] [JJJ010@ 2004-12-10 18:54:49: (-111.509, 46.2661) Properties: ( {Heading [real]: 247})] [JJJ010@ 2004-12-10 18:55:51: (-111.508, 46.1956) Properties: ( {Heading [real]: 238})] [JJJ010@ 2004-12-10 18:56:53: (-111.508, 46.1253) Properties: ( {Heading [real]: 238})] [JJJ010@ 2004-12-10 18:57:55: (-111.507, 46.0544) Properties: ( {Heading [real]: 240})] [JJJ010@ 2004-12-10 18:58:57: (-111.506, 45.9828) Properties: ( {Heading [real]: 242})] [JJJ010@ 2004-12-10 18:59:59: (-111.506, 45.8958) Properties: ( {Heading [real]: 294})] [JJJ010@ 2004-12-10 19:01:01: (-111.508, 45.8228) Properties: ( {Heading [real]: 247})] [JJJ010@ 2004-12-10 19:02:03: (-111.509, 45.7442) Properties: ( {Heading [real]: 266})] [JJJ010@ 2004-12-10 19:03:05: (-111.549, 45.6875) Properties: ( {Heading [real]: 214})] [JJJ010@ 2004-12-10 19:04:07: (-111.612, 45.7292) Properties: ( {Heading [real]: 205})] [JJJ010@ 2004-12-10 19:05:09: (-111.678, 45.6767) Properties: ( {Heading [real]: 236})] [JJJ010@ 2004-12-10 19:07:13: (-111.687, 45.8181) Properties: ( {Heading [real]: 239})] [JJJ010@ 2004-12-10 19:08:15: (-111.671, 45.8961) Properties: ( {Heading [real]: 267})] [JJJ010@ 2004-12-10 19:09:17: (-111.656, 45.9742) Properties: ( {Heading [real]: 267})] [JJJ010@ 2004-12-10 19:10:19: (-111.642, 46.0519) Properties: ( {Heading [real]: 265})] [JJJ010@ 2004-12-10 19:11:31: (-111.627, 46.1319) Properties: ( {Heading [real]: 235})] [JJJ010@ 2004-12-10 19:12:23: (-111.612, 46.2117) Properties: ( {Heading [real]: 325})] [JJJ010@ 2004-12-10 19:13:25: (-111.594, 46.3067) Properties: ( {Heading [real]: 324})] [JJJ010@ 2004-12-10 19:14:27: (-111.578, 46.3881) Properties: ( {Heading [real]: 278})] [JJJ010@ 2004-12-10 19:15:29: (-111.563, 46.4728) Properties: ( {Heading [real]: 289})] [JJJ010@ 2004-12-10 19:16:31: (-111.547, 46.5531) Properties: ( {Heading [real]: 274})] [JJJ010@ 2004-12-10 19:17:34: (-111.532, 46.6314) Properties: ( {Heading [real]: 263})] [JJJ010@ 2004-12-10 19:18:36: (-111.518, 46.7078) Properties: ( {Heading [real]: 260})] [JJJ010@ 2004-12-10 19:19:38: (-111.504, 46.7814) Properties: ( {Heading [real]: 251})] [JJJ010@ 2004-12-10 19:20:40: (-111.488, 46.8686) Properties: ( {Heading [real]: 297})] [JJJ010@ 2004-12-10 19:21:42: (-111.476, 46.9367) Properties: ( {Heading [real]: 232})] [JJJ010@ 2004-12-10 19:22:44: (-111.463, 47.0064) Properties: ( {Heading [real]: 238})] [JJJ010@ 2004-12-10 19:23:46: (-111.448, 47.0764) Properties: ( {Heading [real]: 239})] [JJJ010@ 2004-12-10 19:24:48: (-111.436, 47.1408) Properties: ( {Heading [real]: 219})] [JJJ010@ 2004-12-10 19:25:50: (-111.425, 47.2042) Properties: ( {Heading [real]: 216})] [JJJ010@ 2004-12-10 19:26:52: (-111.41, 47.2781) Properties: ( {Heading [real]: 252})] [JJJ010@ 2004-12-10 19:27:54: (-111.397, 47.3389) Properties: ( {Heading [real]: 208})] [JJJ010@ 2004-12-10 19:28:56: (-111.387, 47.3947) Properties: ( {Heading [real]: 190})] [JJJ010@ 2004-12-10 19:29:58: (-111.362, 47.4414) Properties: ( {Heading [real]: 168})] [JJJ010@ 2004-12-10 19:31:00: (-111.319, 47.4808) Properties: ( {Heading [real]: 165})] [JJJ010@ 2004-12-10 19:32:02: (-111.337, 47.5011) Properties: ( {Heading [real]: 80})] [JJJ010@ 2004-12-10 19:33:04: (-111.371, 47.4781) Properties: ( {Heading [real]: 110})]

Here is an example of how to access specific information within a trajectory. We show how to get:

  1. Core data such as object_id

  2. Longitude and Latitude

  3. Custom columns such as ‘Heading’

print('Object_id: ' + traj[0][0].object_id)                     # Trajectory 0 in list, point 0 in trajectory
print('Latitude: ' + str(traj[0][0][1]))                        # Trajectory 0 in list, point 0 in trajectory, coordinate[1]
print('Heading: ' + str(traj[0][0].properties['Heading']))

Object_id: JJJ010
Latitude: 47.3697
Heading: 134.0

inFile.close()

The builder has multiple parameters that can be changed. For example, we can

  1. Change the minimum number of points needed to form a trajectory. (builder.minimum_length = 10)

  2. Change the minimum distance between points. (builder.separation_stance = 100)

  3. Change the minimum time between points. (builder.separation_time = datetime.timedelta(minutes=30))