| The present paper, firstly, figures out the characteristics of experimental witheredvegetation including vegetation growth environment, material composition, andphonological phases through searching for related information. Secondly, on the basis ofcurrent polarized remote sensing detect ground targets, the typical grassland hay samplesfor laboratory is precisely measured by means of thermal infrared radiationmeter accordingto thermal infrared polarization detection mechanism. Meantime, in the process ofmeasurement, the thermal polarization of grassland hay in the hemispheres spacedistribution is detailed presented by changing the viewing angle, azimuth and polarizationstate, and combining hay thermal infrared polarization information in different bands withangle information of the grassland. The paper tries to qualitatively analyze thermal infraredpolarization properties of the typical grassland hay, explore the mechanism of thermalinfrared polarization characteristics of information extraction and eventually the paperaims to reach a conclusion by the emission characteristics and parameters. The specificexperiment can be presented that it combines with orthogonal experimental design,analyzes the observation factors that affect thermal infrared polarization remote sensing ofthe typical grassland hay ground in terms of quantitative method, explores the relationshipsamong properties affected, analyzes which factors are the evident one to affect theprosperities, and reaches the final conclusion which provides a theoretical basis forgrassland remote sensing observation. The purpose of the experiment is to discover moreinformation which is beneficial to identification classification of grassland quantitativeremote sensing and spatial structure inversion, carried by the effective combination withthermal infrared channels of multi-angle remote sensing, polarized remote sensing, andmulti-spectral remote sensing, to some extent, the experiment provides support for thedepth study of the grassland quantitative remote sensing.After accurate measurements and rigorous analysis, eventually some findings arediscovered: brightness of the grassland hay thermal infrared polarization radiationincreases according to the viewing angle; different viewing angle, and polarization, exhibitdifferent growth trends; removing the water and chlorophyll interference experimentalsamples, it indicates that the hay is not Lambertian, its degree of polarization of thethermal infrared is very low, and its characteristics have a relationship with its owncellulose content, launch capability, roughness; types of vegetation produce the mostsignificant impact on hay thermal infrared polarization properties, while azimuth does nothave much impact on thermal infrared polarization of grassland hay, not as good as theinteraction with the other two factors significantly; the best level of detection grassland hayis the viewing angle measurement when the azimuth is90°. |
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