Strip Align for MMS - Step by Step Tutorial

1. Identify the Misalignment. Review the LAS Layer to detect where the misalignment occurs.
 

2. Create the Trajectory (Flight) Lines. You can create flight lines in one of the following ways:

• By time, for example, using Auto Create Flight Lines,  creating a flight line every 100 seconds.
   

  

• Manually, creating flight lines as needed. For example, one trajectory line for the outbound path and another for the return path. To create manual flight lines:
  • Select the first and last point of the trajectory line.
  • Press Manual Flight Lines.

Tip: If it is difficult to identify the first and last points of a flight line: Enable the Trajectory Points layer. Right-click the Trajectory Points layer and select Feature Analyst. Select a group of points; all selected points will be highlighted. Adjust the selection to identify where the flight line starts and ends. You can also hold Ctrl to select two specific points instead of identifying them visually in the map view.

3. Perform Post-Processing. Run post-processing (or geocoding). After this step, the flight lines will be visible.
 

4. Copy the LAS_PP (Post-Processing) Layer. Right click --> Copy Layer (name exaple LAS_PP_Copy)

5. Go to TOC → LAS Files tab and ensure that LAS_PP_Copy is set as the active layer.

6. Select the Reference LAS File. Identify which LAS file will be used as the reference:

Tip: The use of ground control points (GCPs) is very helpful for determining which layer should be used as the reference (fixed).

• In the LAS layer, keep only the reference LAS file.
• Remove all other LAS files.

7. Now the LAS_PP_Copy layer now contains only the reference LAS file.

8. Open Strip Align and configure:

• Select LAS_PP_Copy as Use & Fixed.
• Select LAS_PP as Use.

This configuration ensures that Strip Align moves all points to align with the reference layer.

9. Run the Strip Align process to complete the alignment.