This page describes the desktop extension “Ghost Cleaning” for Mobile Mapping.
Main Toolbar > Manage > Ghost Cleaning
Ghosts : A ghost represents a collection of lidar points that should not be present in the point cloud. The best examples are moving objects, like cars or people that are recorded in several positions and appear as erroneous points.
Ghost cleaning: The process of removing unwanted objects from the point cloud. Orbit achieves this goal automatically inside a defined area, by creating a ground surface on the fly and removing all objects above that surface inside a fence. The Ghost cleaning extension only finds, calculates and selects the points that need to be removed, the actual removal of the objects requires Consolidation
Use the generic workflow for Point Cloud Based Extensions to define the source file.
The method for the range of interest is 'Area'.
Define the parameters that will be used in the automatic detection of ghosts.
Only available when the Ground Reference is set 'By DEM file'.
Only available when the Ground Reference is set 'By fixed ground height'.
Delegate to task manager
Allows to schedule a job to be run later by delegating it to the Task Manager.
Start Now
Start the ghost detection immediately. It will create separate .ops files for each project.
Manual Adjustment
Allows the manual editing of the points to be included in the selection, and as a result modifies the objects considered as a ghost.
By pressing “Manual Adjustment” the 3D Point Cloud Clipping tool is opened, which allows manual selection inside the point cloud.
Creates a temporary point cloud file necessary when the run is consolidated. Several projects can be used at once, the result will be an .opd file stored in the run's point cloud folder. The function is envisioned to be run only one time for all the projects. To run “Merge Projects” a second time, the previous .opd file must be deleted.
Start
Start the generation of the .opd file to be used in the Consolidation extension.
Show Fence
Choose to visualize the fence that is drawn or selected.
In the Ghost Cleaning Tab, all Projects are shown including the results and metadata. Standard operations like detaching and maximizing tab are available.