Requires a Strip Adjustment or Strip Align add-on license for LP360 Drone.

The Strip Adjustment feature is a module available in LP360 from v2023.2 to v2025.1.  It is only available within the TrueView workflow for drone data processed in LP360.  It supports TrueView and Microdrones sensors only.

If you are looking for a method and context for Strip Adjustment, please review the article on Strip Adjustment - Method and Context.

If you are looking for information on how to process multiple flights in Strip Adjustment, please review the article on Strip Adjustment - Processing Multiple Flights.

The module can be found on the TrueView Workflow toolbar.

Before using the Strip Adjustment, make sure you have a good initial orientation of strips, this means a good calibration of the system should have been done.  Then, proper boresight angles, lever arms, and potential latency should be known.  It is advised to use Strip Adjustment only when needed to improve the point cloud precision.

Pre-Requisite Steps

Strip Adjustment must be used within the TrueView workflow.  The tool can only be used after performing the following steps:

1. Import the cycle into LP360 Drone.
2. Process the trajectory using the Trajectory Processing wizard.
3. Generate flight lines. (Not applicable for Microdrones sensors.)
4. Create TrueView trajectories.
5. Perform Geocoding.

How to Perform Strip Adjustment

1. Open the module by clicking the Strip Adjustment button.

2. Select the flights to adjust from the Available Cycles list.

3. Set the Geocode options for Clip Angle, Clip Range, and Enable True Track using the same settings as you would for LiDAR Geocode.  Strip Alignment will use these values when re-geocoding the data with the corrected trajectory.
4. Set the image Processing options as necessary to Update EXIF Tags and (Re)Colorize the point cloud after Strip Adjustment corrects the trajectory.
5. Add a name to the Create New layer or chose to Append To and existing layer.
6. Press Submit StripAdjustment Job.  This will finalize the job creation and submit it to the Job Manager queue for processing.
7. Once the Strip Align job dispatches, other operations can be performed in the current project, the project can be closed to work on a different project or LP360 can be closed. Do not log-out of the workstation or shut-down while jobs are running. Any in progress jobs running on the workstation will be lost if it is shut down and there is not a way to restart jobs that are lost in this way. You can lock the workstation without affecting running jobs.  You can open the Job Manager to monitor the status of any job at any time.  
8. An email notification will be sent once the job has completed processing and is ready to be finished. Completing the job requires you to run a manual step in Job Manager.  Open the related project in LP360, if it is not already open, open Job Manager, select the related Ready Strip Adjustment job and then press Complete Job to finish the job and add the new strip adjusted LAS layer to your project.

Advanced Settings

The Strip Adjustment default settings are optimized for most general scenarios and work well on most projects. However, the tool also allows users to adjust certain settings for each flight based on specific needs or circumstances.  This is done through the Advanced Settings options and assumes the user has more experience and knowledge on the application of the tool.  The Advanced Setting include:

1. Input Reference File.
2. Advanced Parameters, Tie Points Mode.
3. Advanced Parameters, Time Frame.
4. Reset.

Input Reference File

In the Input Reference File section, the user has the option to use reference data for the adjustment.  The reference data will not be adjusted but will be used during the adjustment to fit the rest of the flight lines to it.  In this case the reference data serves as a "known good" surface.  The reference data needs to overlap with the data to be adjusted.

The reference files can be:

• A reference cycle: one or more cycles can be used as reference.
• A reference LAS layer: one or more LAS layers can be used as a reference.

Note that the cycle(s) selected in the input settings cannot also serve as a reference cycle and will not appear in the list.

Advanced Parameters

This section is for advanced users and should be modified with caution. Most user will not need to modify the parameters in this section.  Changing these settings will change how Strip Adjustment results are generated and may also affect the processing time.

Tie Points Mode

To estimate the trajectory correction, only a portion of the point cloud data is considered. The algorithm uses common points, which we refer to as Tie Points, seen by different passes/scans of the objects.  Not all observable Tie Points are needed; enough points to be representative of the trajectory errors is realized by subsampling the data.  There are two subsampling methods.  This parameter defines the one used:

Uniform Recommended mode.  Tie points are uniformly distributed through the terrain. This option should be used for non-flat terrains.  It is also recommended for high dynamic trajectory errors.

Normal Tie points are equally distributed on each terrain type with a different orientation.  This option should be used for terrains with a predominant direction where the variation of the orientation is relatively small.  It is also recommended for low dynamic trajectory errors.

Time Frame

This parameter defines the frequency of corrections generated for the trajectory.  The smaller this value, the higher the frequency of the correction.  The higher the correction, the more time consuming is the processing.  In general, the more dynamic the errors, the smaller the time frame parameter should be set.

Reset

The reset button will reset all the Strip Adjustment parameters to the default ones.

If you are looking for the method and context for Strip Adjustment, please review the article on Strip Adjustment Method and Context

If you are looking for how to process multiple flights in Strip Adjustment, please review the article on Strip Adjustment Processing Multiple flights

If you are looking for information on Flight Planning - LiDAR, please review the article on Flight Planning - LiDAR.