TerraMatch User Guide
Find match vs. Tie Lines
There are two methods of strip adjustment in TerraMatch, Find Match and Tie Lines. The methods are compared in the following table.
Find Match |
Tie Lines |
|---|---|
Tool Find Match Tool Find Fluctuations |
Tool Find Tie Line Match |
Surface-to-surface matching |
Feature-to-feature matching |
Only one type of observation |
Several types of observations |
More time consuming adjustment |
Less time consuming adjustment |
New (better) observations for each iteration |
Old observations included for each iteration |
No manual observations |
Manual observations possible |
Input data |
|
•trajectories with time stamp •laser points linked to trajectories and classified into ground (and optional buildings) per strip •(optional) ground control points |
•trajectories with time stamp •tie lines derived from laser points, linked to trajectories by time stamp •(optional) ground control points |
Solvable parameters |
|
•easting, northing, elevations shifts •heading, roll, pitch shifts •mirror scale •easting, northing, elevations drifts •heading, roll, pitch drifts •fluctuating elevation |
•easting, northing, elevations shifts •heading, roll, pitch shifts •mirror scale •fluctuating easting/northing, elevation, heading, roll, pitch |
Observations |
|
•triangulated model from each strip surface •compares overlapping laser points and ground control points against this surface •translates observed difference and gradient to heading, roll, pitch, elevation difference |
•surface/section lines - follow direction of a surface •ground lines/points - located on paint markings •roof intersection lines - located at an intersection of two roof surfaces •known lines/points - located at known point locations |