====== Workflow on Bridge Clearance ======

This video is about automatically calculating bridge clearance on large scale pointcloud.
From raw input pointcloud, get individual minimum height value under each bridge featured in the pointcloud  \\

{{:recordings:tutorials:bridge_clearance.png?direct&900|}}

==== Step by step ====

  - Load your raw RGB mobile mapping pointcloud and optimize to OPC format if needed\\
     * {{:recordings:tutorials:bridge_clearance_000.png?direct&600|}}
  - Classify Roads and Bridges and extract Bridges as 3D-Objects
     * Set in Extract > AI-Detection and set in a New Project
     * Select your pointcloud
     * 3D-Segmentation
     * bentley-road-bridge-detector
     * Start
     * {{:recordings:tutorials:bridge_clearance002.png?direct&150|}} {{:recordings:tutorials:bridge_clearance003.png?direct&600|}}
  - Create bridges' footprints
     * Set in Tools > Create footprints
     * Extract bridges footprints (See documentation)
     * {{:recordings:tutorials:bridge_clearance004.png?direct&150|}}{{:recordings:tutorials:bridge_clearance005.png?direct&600|}}
  - Calculate bridge clearance for each bridge
     * Set in Extract > Clearance Checker and Set in a New Project
     * Select your raw RGB pointcloud
     * Method: Multiple Areas and select the footprints you previously extracted
     * Define settings as per your needs (see [[261:desktop_ext:clearance_checker|documentation]]) and and Start
  - Output
     * The output of this work is individual points
     * For each bridge: 1 point + minimal clearance available as an attribute that can be shared or exported to any GIS format
     * {{:recordings:tutorials:bridge_clearance007.png?direct&600|}}