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

Abstract

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 determine the projection boundary of the crown of young apple tree in scientific way. A spatial variation temporal variation process of the scope of the shade of the apple tree can be gained by quantitative analysis. A spatial scale and the number of a shading object can be determined. The method to determine projection boundary of the crown of young apple tree is the basis of analog computation of the intensity of solar radiation under the apple tree.

Description

technical field [0001] The invention relates to the field of agriculture, in particular to a method for determining the projected boundary of the canopy of a single young apple tree. Background technique [0002] Agroforestry provides a new way of thinking and a new concept for the sustainable development of agriculture, and it has been widely promoted and applied in my country. Among them, the fruit farming intercropping system is the main agroforestry model and agricultural land use mode in the Loess Plateau. It plays an important role in coordinating the contradiction between agriculture and forestry land in the Loess Plateau, improving land use efficiency and increasing the income of local farmers. Effective ways and technical measures for recovery and reconstruction. [0003] However, due to the difficulty in determining the projected boundary of the fruit tree canopy, the intercropping system of fruit farmers has become a technical bottleneck in the practice of the co...

AI Technical Summary

Problems solved by technology

[0006] Moreover, the prior art also has the following disadvantages: (1) The tree crown model has a single shape, which is different from the actual tree shape, resulting in insufficient simulation accuracy

(2) There are many variables in the model, and there are problems of complex calculation and heavy workload

(3) Failure to realize the organic combination of spatial distribution and temporal dynamics of solar radiation under forests in the agroforestry system, and at the same time systematically simulate and analyze the projection dynamics of individual trees, resulting in continuous changes in projection, neighbor interference, and agroforestry. Applications such as system ecological environment simulation are limited

(4) Due to the obvious penumbra effect after sunrise and before sunset, the model has a large error in simulating the actual shadow during this period

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