====== Group points ======

Grouping points is essential to how it works with many tools ([[connect_ab|AB]] and [[connect_abc|ABC]] in particular). It increases the precision of statistically recorded points.

To group points, you need to :
  - Select the projects whose points you wish to group
  - Select a value for the point grouping radius. By default, this value is set to 2cm, which ensures optimum precision, taking RTK accuracy into account. **It is strongly recommended to leave this setting at 2cm**.

**Warning**: Changing this parameter may lead to robot guidance problems when traversing the map. The larger the parameter, the greater the inaccuracy of the final map.

{{ :en:cluster_filter.png?400 |}}

Once the first grouping has been performed by clicking on **GROUP**, it is possible to see whether the software has been able to group all the points or not.
In fact, the option will detect and highlight ungrouped points using a blue filter

{{ :en:cluster_filter_en.png?400 |}}

These ungrouped points can be cleaned up by zooming in on these highlighted areas, then using the **SELECT** button to frame the points you wish to remove with a polygonal selection, then using the **DELETE** button.

{{ :en:cluster_select.png?400 |}}

After each deletion, the points are grouped again to check that the cleaning is sufficient.
**It is necessary to carry out these actions for all points that you wish to group, and which are highlighted using the blue filter.**

If you wish to keep the group of highlighted points (U-turn area saved at the same time as the map, ...), you can clean the filters displayed:
  * Via the tool error filter cleaning option in the [[layers_dialog|menu for maps]]
  * Via the **CLEAR FILTER** button

Once all the points have been grouped, you can click on **CONTINUE** to carry out the rest of the actions.

The following actions are linked to the selected options:
  * [[connect_ab|AB / AB automatic]]
  * [[connect_abc|ABC / ABC automatic]]