====== Preferences of Crosswalk Detection ======

This page describes only the parameters and preferences of Crosswalk Detector. \\
Full documentation about semi-automatic detectors, see [[201:technology:3d_mapping:measurements|]].

{{orbitgis:how_to_find.png?25&nolink|}} Main Toolbar > Preferences > Detectors > Crosswalk Detector

{{  :201:desktop:preferences:preferences_detector_crosswalk_v1950.png  |}}

===== Algorithm =====

=== Search radius ===

The algorithm searches for high-intensity points in the space of which the width is indicated by this value around the coordinates indicated by the user.

=== Ground margin ===

Within this distance above the ground, the crosswalk will be detected. 

=== Stripe size and Space size ===

Fixed width of the crosswalk stripe and the distance between 2 consequent stripes.

=== Step 2D, Step angle and max angle ===

Starting from the first coordinate indicated by the user, the algorithm searches for the exact length of the crosswalk.
The Step 2D value indicates the length of the step to reposition the feature. The Step Angle is used to reposition the feature.

=== Context radius ===

{{:201:desktop:preferences:preferences_detector_crosswalk_example_v1950.png?500|}}

===== Output =====

=== Return stripes === 

Enable returning multi-feature consisting of separate polygons for each crosswalk stripe.\\

=== Default length === 

Stripe length used only for visualization during the measurement.