====== Compare pointcloud to pointcloud comparison - v2 ======
This page describes how to execute pointcloud-based change detection leveraging Compare pointcloud to pointcloud v2 tool.

{{orbit_desktop:how_to_find.png?25&nolink  |}} Main Toolbar > Extract > Compare pointcloud to pointcloud - v2

===== Concepts =====

Compare pointcloud to pointcloud v2 compares two pointcloud covering a single scene and captured at different points in time. It automatically outputs pointclouds acting as a change-map.
  - Input:
    * Pointcloud A (opc format)
    * Pointcloud B (opc format)
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  - Output:
    * Changes added (opc)
    * Changes Removed (opc)
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===== Sidebar =====
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==== Source ====

Select the first pointcloud you want the comparison to be executed on.

==== Project ====

Each comparison job fits in a project. Open recent one to retrieve previous results or create a new one to launch a new comparison job.

==== Compare ====

Select the second pointcloud you want to use for comparison. It must be loaded in iTwin Capture Manage & Extract frame and highlighted in the left side bar before being added.

==== Options ====

  * Threshold: Minimum distance defining a change between pointcloud A & B. If not defined, value will be automatically set
  * Filter Threshold: Minimum distance filtering out identified changes. If not defined, value will be automatically set.
  * Points per change Min: Minimum number of points for a change to be considered. If not defined, value will be automatically set


==== Range of interest ====

  * Entire source: Compare pointclouds A and B on their entire extents
  * Area: Restrict the comparison area to a fence you draw on a map or an existing vector polygon


==== Start Now ====

Submit job to run pointcloud comparison.