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dev:technology:3d_mapping:linear_referencing [2021/11/04 12:38]
jeroen [LRS for Measurements] 		— (current)
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-====== Linear Referencing ====== 
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-{{  :dev:technology:3d_mapping:linearreferencing_1900.jpg?nolink  |}} 
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-===== Concepts ===== 
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-Linear Reference Measure Option enables the option to select a vector line dataset Measure Attribute Formula for every measurement, identifying linear distance from the beginning of the closest reference line to the dropped position of the center of the measurement onto this line. 
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-===== LRS for Measurements ===== 
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-=== Source Vector Data === 
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-The LRS input can be either Line or Point vector dataset (.ovf, .ovt, or .shp) and needs to be added as a local resource into the Workspace. \\ 
-Point datasets must have the attribute ''GPStime'' or ''OrbitTimestamp'' to order consecutive points 
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-=== Activate === 
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-Activate 'Enable Linear Referencing' preference in the "Measure Options" group. 
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-If Linear Referencing is enabled, select 'Linear Referencing dataset' drop-down menu will appear on the Measure Sidebar, where all vector datasets of the correct type available in the dataset list will be shown. 
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-=== Measure === 
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-The center of the measurement will be dropped perpendicular to the closest line segment of the LRS dataset. If the LRS dataset is 2D, the closest 2D perpendicular distance is calculated. If the LRS dataset is 3D, 3D distances are calculated.  
-    * The dropped distance is shown as a pink line. 
-    * The Linear Referencing segment is shown as a green line. 
-    * Linear Referencing measurement results (LRef) are listed in the Measure Sidebar. 
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-===== LRS for Search and Geocode ===== 
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-=== Source Vector Data === 
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-The LRS input must be a line vector dataset (.ovf) and added into the Orbit installation directory, ''program/system/linear_reference'', prior to starting the application. 
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-=== Activate === 
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-=== Search === 
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-===== LRS with Clip Box ===== 
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-With Clip Box positioning slider and 'jumping distance' the clipping box can be easily moved along the linear referencing line if the Clip Box is defined (how to define clipping box, see [[dev:desktop:tools:clip|]]). 
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Last modified:: 2021/11/04 12:38