Comparison of Polarized Spectral Characteristics Between Petroleum-Polluted Cropland Soil and Wetland Soil

Remote Sensing Technology is an important and useful method to monitor the Earth's surface by receiving the electromagnetic waves reflected or radiated from the targets, and optical and thermal remote sensing is the most common remote sensing methods. Polarization is a ubiquitous optical phenomenon which has commercial and technological applications. After decades of development, polarization remote sensing has become a widely applied technology in Earth observation. Depending on intensity information, traditional optical remote sensing has many disadvantages on target identification and information extraction, but it could be modified by appending polarization information to it, so that, the features and characteristics of the targets could be obtained from polarization information. Soil is a complex substance that plays an important role in the ecosystem. Hence itself is helpful to apply remote sensing on the soil to monitor the environment and treat pollution. Ideally, the soil do not obviously reflect or absorb electromagnetic waves in any range of wavelength, while the moisture, organic matters and roughness usually influences the spectrum characteristic of soil. According to recent studies, it is significant that petroleum an influences the polarized spectrum characteristics of the soil. Especially in the red and infrared spectral regions, the spectral response of petroleum is so pretty obvious, that the pollution on the Earth's surface could be detected by remote sensing of a wide range and multiple periods. In addition, it is reasonable for us to assume thatthe influence on viewing effect of petroleum might vary in different soil types. In this paper, the petroleum-polluted soils were respectively sampled from a wetland and a cropland in Zhenlai Petroleum Factory, located in Jilin Petroleum Field. By multiangle measurement, we managed to compare the polarized spectrum characteristics of each kind of soil sample and analyze the influences on them with quantitative and qualitative methods. The results suggest it is obvious the polarized spectrum characteristics of wetland soil differ from another one, because of the difference in moisture and structure, together with the existence of petroleum, for which the measured polarized reflectance value has a significant shift from the predicted polarized reflectance value.