TerraMatch User Guide

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Navigation: Tool Reference > Working with Tie Lines

Tie line types

There are different types of tie lines which can be created depending on the objects and features available in the laser data set. An overview of the tie line types is given in the following table and examples are shown below in another table.

Abbreviations
(G)CP - (ground) control point	h - heading	x - easting
ALS - airborne laser scanning data	r - roll	y - northing
MLS - mobile laser scanning data	p - pitch	z - elevation

Tie line type	Placement method	Possible locations	Added value for solving	Input data
Ground point	•manual	•end point of paint markings on the ground •circular objects on the ground	•h r p •xy z	•high point density ALS •MLS
Known xyz point Known xy point	•import from text file or selected vectors •automatic/manual	•CP on bright signal marker on dark hard surface (horizontal or vertical surface) •GCP on endpoints of paint markings on the ground •CP defined on target objects •Xyz point if reference lines are defined	•h r p •absolute xy z or xy	•high point density ALS •MLS •signal marker definition or target object definition •GCP text file or vector data
Known z point	•import from text file or selected vectors •manual	•GCP on the ground without known xy	•h r p •absolute z	•ALS •MLS •GCP text file or vector data
Xyz point	•automatic	•objects represented by grouped and classified points	•absolute xy z	•ALS •MLS
Xy point	•manual	•building corners •poles	•h •internal xy	•high point density ALS •MLS
Elevation point	•import from text file or selected vectors •half-automatic	•surfaces	•internal z	•ALS •MLS
Ground line	•manual	•along paint markings on the ground	•h r p •xy z	•high point density ALS •MLS
Plane point	•automatic search	•surfaces	•h r p •xy z	•high point density ALS •MLS
Section line •flat ground	•automatic search •manual	•flat, hard surfaces	•r •z	•ALS •MLS •flat ground classification
Section line •surface	•automatic search •manual	•surfaces	•h r p •z	•ALS
Section line •vertical walls	•automatic search •manual	•building walls •vertical poles	•h r p •xy z	•MLS
Known line	•import from text file •automatic/manual	•point on linear paint markings	•h •r p (ALS) •xy z	•high point density ALS •MLS
Cloud known XYZ	•automatic search	•several alternative environments. See Search cloud-to-cloud for details.	•absolute xy z	•ALS, MLS, UAV scanning systems •Reference point cloud
Cloud XYZ Cloud XY	•automatic search	•several alternative environments. See Search cloud-to-cloud for details.	•internal xy z or xy	•ALS, MLS, UAV scanning systems
Roof intersection line	•automatic search	•intersection of two roof surfaces	•h r p •xy z	•ALS •building classification

Examples
Known xyz or xy point	Known line
Known z point	Plane point
Ground point	Ground line
Section line - flat ground	Section line - surface
Section line - vertical wall	Roof intersection line
Xy point	Elevation point

Examples

Known xyz or xy point

tl_ex_signalmarker