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Clearance Checker
This page describes the Orbit desktop extension “Clearance Checker”.
Main Toolbar > Extract > Clearance Checker
Concepts
The Clearance checker extension calculates the lowest clearance of overhanging objects or constructions above a surface.
Source
Use the generic workflow for Point Cloud Based Extensions to define the source file.
The method for the range of interest is 'Path', 'Multiple Paths', 'Area' and 'Multiple Areas'.
Supplement, Group By
Select how the clearance obstructions are grouped by:
Clusters - For every area or path, the point cloud gets divided into clusters. For each cluster, the lowest clearance will be calculated.
Ranges - For every area or path, the lowest clearance will be calculated.
Ground Reference
Choose one of the below-described options to define the Ground Reference:
Point Cloud lowest Z - The lowest z-value of the point cloud.
Point Cloud Z below trajectory - The lowest z-value of the first point cloud cluster found below the trajectory.
Trajectory offset - Fixed vertical offset from the trajectory.
A trajectory needs to be defined in block Trajectory: a new path can be drawn or selected.
Vertical offset needs to be defined in parameters.
Fixed height - Fixed z-value defined in parameters.
Use paths - The source path(s) are used to set the ground reference.
Parameters
Generic concepts, see Preferences for Detectors
Some parameters are greyed out based on the options previously selected.
Results
The Hit count is the number of clearances found.
- Z range: Value of the clearance.
- #pnts: Number of points defining the ceiling of the clearance.
DEM files are added to the Dataset List by default and are saved in the corresponding folder (see above).
- Clearance
- Cluster_min_clearance
- Ground
- Pixel_z_range
Clearance Checker Tab
In the Clearance Checker Tab all Clearance Projects are shown including the results and metadata. Standard operations like detaching and maximizing tab are available.
