Wetland aquatic vegetation canopy reflection modeling method based on photon mapping

Abstract

The invention relates to a wetland aquatic vegetation canopy reflection modeling method based on photon mapping. The method comprises the following steps that a three-dimensional scene of aquatic vegetation is constructed according to the shape structure, geometric parameters and other characteristics of simulated vegetation; coupling the water surface reflection model, the water body scattering model and the blade reflection and transmission model to set optical attributes of the scene; photons are emitted into the scene from the light source position, and a body photon graph and a global photon graph are constructed; sampling light is generated from the observation position, a visible point is generated, photon density estimation is carried out, and meanwhile, canopy reflectivity estimation is carried out; performing multi-round iteration on the two steps, and updating the radius of photon density estimation until a convergence result is achieved; the reflection spectrum characteristics and the reflection direction characteristics of the aquatic vegetation canopies are obtained. According to the method, a new model tool and a technical method are provided for remote sensing monitoring of physiological and biochemical parameters of aquatic vegetation canopies, and meanwhile, a scientific basis is provided for precise water and fertilizer regulation and management of aquatic crops and wetland ecological environment monitoring.

Description

[0001] (1) The technical field [0002] The invention relates to a method for modeling wetland aquatic vegetation canopy reflection based on photon mapping, belongs to the field of optical remote sensing, can be applied to the verification of other remote sensing models, and has important significance in wetland ecological research and crop quantitative monitoring application. (2) Background technology [0003] Aquatic vegetation is a common type of vegetation in agricultural production and natural ecology. Remote sensing modeling for three-dimensional aquatic vegetation plays a crucial role in the quantitative study of its radiation characteristics. Due to the existence of water bodies in the 3D aquatic vegetation scene, the process of radiation transfer in this scene has obvious changes compared with terrestrial vegetation, mainly due to the water-air interface and various impurity particles in the water body. Light will be reflected or refracted at the water-air interface. ...

AI Technical Summary

Problems solved by technology

The light will be reflected or refracted on the water-air interface. Since the water surface is not completely smooth in reality, it cannot be regarded as an ideal scattering or refracted phenomenon. In the water body, the light will interact with impurities, thus deflecting , causing the effect of volume scattering, which increases the complexity of remote sensing modeling of aquatic vegetation

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