杨树的树冠分枝较多，单独分枝于树冠上层时，容易造成过度分割，且杨树树冠

Poplar crown more branches, the canopy in the upper branch alone, likely to cause over-segmentation, and larger coverage of Crown, when two of overlapping individual tree, is likely to cause leakage points.

Poplar tree canopy branch more, separate branching in the upper layer of the tree canopy, easy to cause excessive division, and poplar canopy coverage is larger, when the two single wood overlap, easy to cause leakage.

There are many branches in the crown of poplars, when they are branched on the top of the crown alone, it is easy to cause over segmentation, and the coverage of the crown of poplars is large, when two single trees overlap and interlace, it is easy to cause missing points.<br>