====== Workflow on Semi - Automated Guardrail Detection ======

This page describes the workflow of feature extraction using the semi-automated Guardrail detector.  \\
For semi-automated measurements, see [[2110:technology:3d_mapping:measurements_semi_automated|]]. \\
Overview and concepts about semi-automatic detectors, see [[2110:technology:3d_mapping:measurements|]].\\
General concepts of Detectors Preferences, see [[2110:desktop:preferences:detectors|]].
===== Workflow =====
 
The process of detecting guardrails can be split into five main steps:
  - Raw input data interpretation
  - Create recordable linear dataset
  - Set unique parameters for guardrail detection
  - Detect representative guardrail
  - Detect guardrail for all input data


{{ :224:desktop_ext:automated_feature_extraction:guardrails.mp4?nolink&850x478 |}}

==== Interpret Data, Inspect Guardrails====

Each data set is unique and as such a new data interpretation is required.  
If you intend to save the upcoming detected guardrails, [[224:desktop:dataset:new_vector_dataset|]] with **spatial type as line**. You can choose //Guardrail// under Pre-set configuration to benefit from preconfigured attributes in the attribute table. 
Set the dataset to [[224:desktop:dataset:operations_indicators#recorded_dataset|recordable dataset]]= “red”. 

==== Set Parameters =====

**Enable linear reference measurements** under //[[224:desktop:preferences:index|Preferences Panel]], 3D Hover, Measure options//. Get the width and height of the guardrail by using the measure tools (use for example “//Free line//”). Set the parameters in the **Guardrail Detector** settings according to the above detected values (height and width). 

==== Run detection on Sample Area ====

Select the **Map 3D** and then in the [[224:desktop_ext:slice_view| Slice view]] tab, select //Vertical slice by 2 coordinates// and hit start to select 2 points on your point cloud to create the slice. Adjust the slice to display the full extent of the Guardrails. 
Go to //Measure// and under //Line// select the **Guardrail with 1 point semi-automatic function. A yellow box** will appear in the slice view when guardrails weight and height **are set correctly**. Place the yellow box over the guardrails and click to start the detection/measurement. 

==== Run detection and handle results ====

**To automatically repeat this process, click on copy to feature to save the extracted feature in the line vector dataset** or enable "//Auto copy measurement to recorded dataset//" in the 3D Hover preferences. If needed, repeat the process by clicking on the end of the detected line. **Recreate a new detecting/measurement by clicking at the end of your last detected line** in the required region on your point cloud. 


**The results can be imported and used to create an Inventory theme** to further analyse the data using [[224:desktop_ext:asset_inventory:manage_themes|]] and [[224:desktop_ext:asset_inventory:verify_item|]].