Importing Trajectory Data – Prepare the Project

The trajectory files that you are loading should be in the *.out format. These will be converted to *.trj when the files are imported.

Note that adding a default file does NOT import your data. Similar to creating a Terrascan project you must still import your trajectory files

Importing Trajectory Data - SBET

Open the trajectory tool

Importing Trajectory Data - SBET

The file format should be set to SBET as a default.

You can choose your projection based on options you chose when defining your project projection.

The thin positions removes some of the data to create a smaller dataset. For this project we did not do that.

Displaying Trajectories

Create a trajectories layer in the level manager and set it as the active layer in the display menu

Displaying Trajectories

Choose the colouring option you would like to use and thin the positions if you would like (does not affect processing, only display)

Add lever arm allows you to account for the distance from the laser to the IMU. This dataset has already been corrected.

Creating Flightlines From Trajectories

Since we are trying to correct alignment errors in the flightlines, it is important to identify the various flightlines from the trajectory data.

Creating Flightlines From Trajectories -Automatically

The automatic method makes use of the time-stamp on each LiDAR point which is then related to the trajectory data.

Trajectory points can be filtered according to LiDAR points; keeps trajectory points only where LiDAR data exists.

To accomplish this select the Tools – Trajectories window to open “Split at laser gaps” window.

Keep the default settings. You don’t want the gap to

be too large or you could loose data.

Creating Flightlines From Trajectories -Automatically

Since we are trying to correct alignment errors in the flightlines, it is important to identify the various flightlines from the trajectory data.

Viewing/Editing Trajectories

To highlight a trajectory, select it in the trajectory dialogue and select show location.

Deleting Flightlines

To delete a flightline, select it, open the trajectory menu to select delete.

Renumbering Flightlines

To renumber you flightlines after deleting them go to tools –renumber trajectories. Select the number you would like the labelling to start at.

Flightline Information

If you want information about your trajectories use the edit menu to open the trajectory information dialogue. In this window you can set the quality which is important when “weighting” the flightlines during the terramatch process

Add Flightlines to Your Project

If you want to add each individual flightline into the main viewer, select it in the trajectory window and select Tools – Draw into design. To give eachflightline a different colour select flightlinecolours in the color by option