PROBLEM TO BE SOLVED: To provide a tree crown measuring implement capable of easily measuring a tree crown by facilitating measurement of a distance from a trunk to the tip of a branch.SOLUTION: The tree crown measuring implement 100 includes: a cylindrical body 200 a cross line 201 perpendicular to the axis of the cylindrical body 200 and disposed at one end of the cylindrical body 200 in such a way that the crossing point P is aligned with the axis a weight 202 suspended from the cross line 201 a mirror 204 housed at the other end of the cylindrical body 200 in such a state as inclined at about 45 degrees to the axis of the cylindrical body 200 and an inspection hole 205 bored in the side periphery of the cylindrical body for viewing the scene on the one end side reflected by the mirror 204. A position vertically under a prescribed part of a target branch for measurement to be observed from the inspection hole 205 can be fixed by aligning the weight 202 with the crossing point of the cross line 201.COPYRIGHT: (C)2012,JPO&INPIT【課題】幹から枝の先端までの距離測定を容易化し、簡便な樹冠測定を実現する樹冠測定具を提供すること【解決手段】 筒体200と、筒体200の一端に、筒体200の軸に垂直であって交差点Pを軸に一致させて配した十字線体201と、十字線体201から下垂させた重り202と、筒体200の他端に、筒体200の軸と略45度に傾けて内装させた鏡体204と、鏡体204により反射された前記一端側の光景を見るために筒体側周にあけた覗き窓205と、を具備し、覗き窓205から観測される測定対象の枝の所定箇所の鉛直下の位置を、重り202と十字線体201の交差点とを一致させることにより確定可能にしたことを特徴とする樹冠測定具100。【選択図】図1
