This page describes how to use the desktop mobile mapping extension “Trajectory”.
The “Trajectory” (previously “Trajectory Adjustment”) extensions makes it possible to apply measured ground control points to correct a well defined segment of your mobile mapping run to improve its absolute accuracy.
Main Toolbar > Extensions > Trajectory Adjustment
A well defined segment of a run can be adjusted or removed. An adjustment is calculated using all available measured ground control points. Removing or adjusting segments will affect all resources. A quick preview can be processed, but to actual adjustment of the entire run requires consolidation.
To use the “Trajectory” extension following conditions are required :
Following color codes are used to indicate the segment status :
File menu drop-down
Create a new segment, open, and close or delete the opened segment via the file menu drop-down icon.
Select on map
Define segment start and end point on the Map 2D.
On clicking this button the according map function will be activated. Two clicks along the trajectory will define start and end point. Once one end point is known a temporary red segment indication will appear when hovering above the run trajectory. When the other segment end is defined the “Select on map” function will be deactivated.
On defining the segment on map the map 2D zoom and context menu function retain available, see MapCanvas
Select in graph
Restarting the selection of an existing segment will replace this segment and remove all processed preview data.
Length and GCP's
The segment length (meters) and the number of measured ground control points within the segment are displayed (measured GCP's relevant for segment / total number of GCP's in run)
Once the opened segment is defined you can decided to “Adjust” or “Remove” the segment.
The options “Process Preview”, “Adjustment in” and “Adjustment Out” are only relevant when you “Adjust” the segment.
Only if the “Process Preview” option is checked the image and point cloud point segment count will calculated and displayed below the progress bar.
Graph
(Click on image to enlarge)
Navigation:
GCP's
Flag GCP's to display the Mobile Mapping Ground Control Points on the trajectory graph.
Hit points
Select segment
Click the “Select” button to select a segment on the graph: