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Looks like a standard tree outline.
No one wants to place all those logs.
Worldeditors: select the points at the corners.
Figure out the data value of the leaves you want to have.
Regular:0
Redwood:1
Birch:2
Jungle:3
Then type /treeize #
Using the proper number.
If anyone does this while selecting anything aside from logs, the results will be disastrous. Especially if it is something large like an entire city.
Hope this makes trees easier for you builders.
NOTE: To undo the entire command, you will need to use /undo 3