...
The upper part of the menu contains the project name and the name of the active folder.
The Selection Area part
Set parameters for the geometry of the area to select points within.
- Rectangle: Divide the area into cells and analyse the points which ara inside the cell. Normally the cell size will be a square.
...
- Circle: First collect all points into cells with half the size as the circle radius. Then sort on increasing or decreasing values and then start removing points within the given radius.
...