Microwave Indices From Active And Passive Sensors For Remote Sensing Application

Past Research Has Comprehensively Assessed The Capabilities Of Satellite Sensors Operating At Microwave Frequencies, Both Active (sar, Scatterometers) And Passive (radiometers), For The Remote Sensing Of Earthrsquo;s Surface. Besides Brightness Temperature And Backscattering Coefficient, Microwave Indices, Defined As A Combination Of Data Collected At Different Frequencies And Polarizations, Revealed A Good Sensitivity To Hydrological Cycle Parameters Such As Surface Soil Moisture, Vegetation Water Content, And Snow Depth And Its Water Equivalent. The Differences Between Microwave Backscattering And Emission At More Frequencies And Polarizations Have Been Well Established In Relation To These Parameters, Enabling Operational Retrieval Algorithms Based On Microwave Indices To Be Developed.