======== Rail detection ========

This video is about how to extract a semi-automatically object type Rails as a 3D line feature using the [[2210:products:3dm_feature_extraction|]]. \\
The extraction of the Rails will be saved to a pre-defined vector file.

{{ :2210:howtoguides:videos:rails_detection.mp4?nolink&850x478 |}}

==== Step by step ====

  - Open the pre-prepared Mobile Mapping run
  - Set 3D Hover Preferences
  - Measure rails
  - Create a preconfigured line vector file 
  - Set dataset to recordable
  - Save the rails measurements to the line vector file
  - Inspect attribute table 
  - //**Optional**// : modify the default parameters of rails detection under the //Detectors// settings 

==== Used Data ====

  * Dataset not available

==== Reference Documentation ====

  * [[2210:technology:3d_mapping:measurements_semi_automated|]] 
  * [[2210:desktop:map:3d_measurements|]] 
  * [[2210:desktop:preferences:3dhover|]]