In a second step a tree height specific filtering takes place. The algorithm creates again a sorted list of the remaining points. Starting of with the highest point of the list, a maximum possible crown diameter is calculated depending on the tree height. The used diameter can be scaled depending on local growing conditions or eucalyptus species. This circle defines the area where all data points need to be checked whether they belong to the tree, which will cause their elimination from the sorted list, or they are part of a neighbouring tree.