期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：1992
卷号：XXIX Part B2
页码：543-548
出版社：Copernicus Publications
摘要：Summary: This paper summarizes the results of work done by authors in the area of passive microwave soil moisture measurementsin Germany, Hungary, India, Italy, the USA and the USSR. A discussion is given on models of interconnection between spectrumof microwave radiation at millimeter, centimeter, and decimeter wavelength with parameters of soil and vegetation. A comparisonis undertaken to analyze the approches for describing the influence of different types of soil, soil bulk density, surface roughness,and temperature variations as well as crop type, biomass and canopy architecture at different stages of growth, leaf area index, andtemperature on microwave radiation of the soil/canopy system. Experimental data of sensitivity of microwave radiation to soilmoisture and some other mentioned above parameters are presented. A comparison is given between the experimental and thetheoretical data. Some attention is put on the dependencies of spectrum data of microwave radiation and the characteristics of soilmoisture profile on the rate of the data change during drying of the soil , and on the screening effect of vegetation at differentfrequencies. A description is presented of some of the main results obtained in several international experiments conducted duringthe last few years. Future steps and approaches in this area of passive microwave remote sensing as well as ideas and plans for newexperiments and instruments are presented as a subject for discussion.
