Measuring method of outdoor typical ground feature pBRDF under different weather conditions

Abstract

The invention provides a measuring method of outdoor typical ground feature pBRDF (Polarization bidirectional reflection distribution function) under different weather conditions. The method comprisesthe following steps of under the unblocked conditions, obtaining polarization information of a typical ground feature by using a polarization imaging detection system; under the condition of completing blocking the direct sun light, obtaining the polarization information again by using the polarization imaging detection system; subtracting the polarization information of the typical ground feature measured in the two times to obtain the polarization light Stokes vector obtained by the ground feature reflection direct sun light and the sky scattering light; respectively measuring the distancebetween a blocking article and the detection system and the posture and the size of the shielding article; measuring the aerosol optical thickness and the ground direct radiation degree by using a heliograph; selecting an atmosphere model parameter by combining the local weather conditions; inputting the atmosphere model parameter into a radiation transmission model to obtain sky scattering lightpolarization information; selecting the proper typical ground feature parameter model; combining the blocking article position to calculate the Stokes vector of the blocked part generated by the ground feature reflecting sky scattering light; subtracting the part caused by the sky scattering light from the measured Stokes vector; finally, through the comparison to a standard plate, solving the typical ground feature surface real pBRDF value. The influence of the sky scattering light on the measurement of the typical ground feature pBRDF value measurement is obviously reduced; the measurement precision of the outdoor typical ground feature pBRDF in complicated weather is improved.

Description

technical field [0001] The invention relates to a method for measuring pBRDF of typical outdoor ground objects under different weather conditions in near-earth remote sensing, in particular to an atmospheric effect correction method combining a radiation transfer model and an artificial occlusion method. Background technique [0002] The polarization of light refers to the phenomenon that the vibration direction of the light wave vector loses symmetry with respect to the propagation direction of Guangde in the process of light propagation. The polarization characteristic of light is a physical quantity that can characterize the essential characteristics of an object. For targets on the earth's surface and in the atmosphere, in the process of reflecting or emitting electromagnetic waves, polarization characteristics determined by their own properties will be generated. Therefore, studying the polarization characteristics of light provides a new kind of information for the det...

AI Technical Summary

Problems solved by technology

[0008] The problem solved by the technology of the present invention is: aiming at the problem that the existing technology is not applicable under complex weather conditions, combined with the advantages of the sky light polarization state model and the traditional shading method, to provide an outdoor typical ground object suitable for various weather conditions The measurement method of pBRDF improves the accuracy of measuring pBRDF of typical ground features under complex weather

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