The Land Covers And Sea Environment Optical Characteristics Modeling And Experimental Measurement Verification

The research on modeling and measurement verification of the optical characteristics of the land covers and sea environment radiation and scattering have important theoretical significance and practical value in the fields of target detection and remote sensing.The radiation and scattering fields of the land covers and sea environment have two impacts on target detection: 1)The radiation and scattering fields of the land covers and sea environment as the noise of target detection will affect the signal-to-noise ratio of the target detection;2)The radiation and scattering field of the land covers and sea environment illuminate the target,which will increase the value of the target's radiation scattering field and improve the signal-to-noise ratio of the target detection.In terms of remote sensing of ground objects,the radiation and scattering characteristics of the terrestrial and sea environment are even more the source of remote sensing detection.The study of the radiation and scattering characteristics of the terrestrial and sea environment can be applied to the auxiliary design of remote sensing detectors,signal processing of remote sensing data,and classification recognition of remote sensing images and other fields.The main contents of this paper are: 1.Based on the sea spectrum model,the linear filtering method is used to complete the geometric modeling of the three-dimensional sea surface.Based on the Cox-Munk model,an anisotropic sea surface emissivity and BRDF model are established,and the variation with wind speed,wind direction,wavelength,incidence and scattering orientation are analyzed.The scattering and self-radiation characteristics of the sea surface to the sunlight and the Earth's atmospheric system radiation were studied.A low sea-level sea surface brightness imaging model was established.The contribution of the sea surface radiation brightness components and the law of sea surface brightness with the observation zenith angle and wind speed were analyzed.2.Based on the model of optical radiation and scattering characteristics of the low scale sea surface,based on the geometric structure of foam particles and foam layer,combined with the theory of equivalent medium layer,an infrared radiation and scattering model covering the foam sea surface is established.The changes of emissivity and BRDF with wind speed and observation zenith angle of foam-free sea surface,foam and foam-covered sea surface are analyzed.3.Using MODIS satellite data to study the radiation and scattering characteristics of the surface environment,Using MCD12C1 to analyze the distribution and proportion of global surface coverage types;using MOD11C1 products to establish a typical emissivity model of ground features;According to the MCD43C1 products and linear core-driven BRDF model,the BDRF model of typical features was obtained;Finally,the modeling of Lambertian and non-Lambertian surface spectral radiation/scattering models is completed.4.Based on the ocean background radiation characteristic test experiment and typical land covers scattering characteristic test experiment,the experimental data of the visible light band and the infrared band were separately calibrated,and the brightness distribution of the ocean,grassland and beach were statistically analyzed.Finally,combined with the meteorological data observed in the experiment,the radiation characteristics of the different land covers at different times were calculated,and they were in good agreement with the experimental results.