Sandy water bottom BRDF (Bidirectional Reflectance Distribution Function) model based on Hapke model

Abstract

The invention relates to a sandy water bottom BRDF (Bidirectional Reflectance Distribution Function) model based on a Hapke model. The sandy water bottom BRDF model based on the Hapke model comprises the following steps: calculating the single scattering albedo of soil particulate matters and the asymmetry factors of a scattering phase function based on a Mie scattering model; inputting the single scattering albedo and the asymmetry factors of the scattering phase functions which are obtained through Mie scattering calculation, set hot spot widths and hot spot heights into the Hapke model, and calculating so as to obtain the bidirectional reflectivity of bare soil; giving the concentrations of water body components (chlorophyll a, inorganic suspended matters and yellow matters), a water depth, a sun incidence zenith angle and a water bottom albedo so as to construct an optical shallow water body biological optical model; and coupling the Hapke model and the optical shallow water body biological optical model so as to form the sandy water bottom BRDF model. The sandy water bottom BRDF model has the advantages that the accurate descriptions for sandy water bottom direction reflection characteristics are realized under the conditions of different water depths, water quality, water bottom roughness, albedos and sun incidence elevating angles and are the precondition and foundation for realizing the accurate remote sensing inversion of water depths and water environmental parameters in an optical shallow water zone.

Description

(1) Technical field [0001] The invention relates to a sandy underwater BRDF model based on a Hapke model, belongs to the field of optical remote sensing, and has great significance in the research and quantitative application of water color remote sensing technology. (2) Background technology [0002] The substrate types of large natural water bodies (including oceans, lakes, rivers, and reservoirs, etc.) are mainly divided into: sandy type, silt type, aquatic plant type, coral reef type and a mixture of the above types. Compared with other bottom types, the sandy bottom has strong reflection characteristics, which has a significant impact on optical shallow water remote sensing signals. Therefore, scientific understanding of the two-way reflection characteristics of sandy bottom is of great significance for accurate inversion of shallow ocean water quality and water depth remote sensing inversion. [0003] Dichroic reflection is a basic macroscopic phenomenon of objects re...

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Problems solved by technology

This is mainly due to the fact that there are many factors that affect the directionality of the ocean spectrum, and it is difficult to measure in situ at sea. The wind and waves, the shadow of the hull and equipment, and the incident light conditions can all cause large errors, and it is difficult to measure accurately through experiments.

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