Determines how elements are assigned to elementgroups. The variable has three possible values:
The elements hold an election to choose the pixel that best represents the element as a whole. The element is placed in the elementgroups corresponding to the pixel's pixelgroups.
The element is placed in the elementgroups corresponding to all of the pixelgroups of any pixel within (or partially within) the element.
The element is placed in the elementgroups corresponding to the pixelgroups of the pixel in the center of the element.
Default: election