Tree shade simulation and quantification method based on three-dimensional scene

The invention provides a tree shade simulation and quantification method based on a three-dimensional scene, and the method comprises the steps: simulating various urban garden three-dimensional scenes through a three-dimensional reconstruction technology, carrying out the type identification of a geographic entity model, calculating the geometric position parameter information of the sun at each moment in a year through an astronomical parameter method according to the geographic position, and carrying out the calculation. And utilizing a ray intersection algorithm to judge the shielding condition of the sun rays and the scene three-dimensional model, and if the sun rays are shielded by trees, generating tree shade. Correspondingly, the tree shade effect at any position and any moment can be simulated, and data such as the tree shade area and the tree shade coverage duration can be quantified. The method can more objectively and intuitively express the shading condition of the urban trees, provides technical