Method to determine projection boundary of the crown of young apple tree

The invention discloses a method to determine projection boundary of the crown of young apple tree. The shape of the crown of the young apple tree with normal growth is viewed as oval. The model of the projection boundary of the apple tree should be established in accordance with the actual geometric body features of the crown of the young apple tree. According to the geometric structure of the young apple tree, a tree-dimensional coordinate system of the projection of the crown is established. A vector equation of the incident ray of the sun is inferred. Coordinates of the projection at any point of the crown of tree can be solved by the vector equation of the incident ray of the sun. Spatial coordinates of the projection boundary of the crown of the apple tree at various times can be solved in combination of the motion law of the sun. Function of the projection boundary of the crown of the young apple tree can also be solved. The method to determine projection boundary of the crown of young apple tree can d