土壤是地球表面最广泛出露的地物之一。土壤的光谱反射特征除了取决于它本身的物理化学性质、有机质含量及颗粒大小之外,湿度是影响土壤光谱反射率的一个活跃的重要因素。由于土壤中水份含量的多寡对热量平衡、土壤温度、农业墒情均有重要意义,所以,用可见、近红外、热红外以及微波等遥感手段探测土壤含水量的研究日益广泛深入。 Soil is one of the most exposed features on the Earth’s surface. In addition to its own physico-chemical properties, organic matter content and particle size, the spectral reflectance of soil is an active and important factor affecting soil spectral reflectance. Because of the amount of water in the soil, it is of great significance to the balance of heat, the soil temperature and the agricultural moisture content. Therefore, the research on the detection of soil water content by visible, near-infrared, thermal infrared and microwave remote sensing is becoming more and more extensive.