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在分析应用遥感资料监测土壤水分的方法及其可行性的基础上,介绍了表观热惯量法监测土壤水分的基本原理和具体实施步骤。通过实测资料的验证表明,此种方法在0~20cm的土层内具有较高的精度,而在30cm以下的深度应用此法其精度有所降低。同传统的水分监测方法相比,表观热惯量法监测土壤水分具有方便、快捷、多时相等特点;同其他遥感方法相比,该方法应用简单,成本低,无需过多的气象数据支持即可完成对大面积土壤水分变化的监测,但仅适用于裸土或低植被覆盖的条件。
Based on the analysis of the methods of monitoring soil moisture using remote sensing data and its feasibility, the basic principle and specific implementation steps of monitoring soil moisture by apparent thermal inertia method are introduced. The verification of the measured data shows that this method has higher accuracy in the soil layer of 0 ~ 20cm, while the accuracy of this method is reduced when the depth is less than 30cm. Compared with the traditional water monitoring methods, the apparent thermal inertia method has the advantages of convenient, fast and long-term monitoring of soil moisture. Compared with other remote sensing methods, the method has the advantages of simple application, low cost and no need of excessive meteorological data support Complete monitoring of large-area changes in soil moisture, but only for bare soil or low vegetation cover conditions.