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This bacterial disease has the potential to spread quickly and damage — or even kill — unprotected trees . The transmitted radar signal is characterized by its amplitude , frequency , phase , polarization , and incidence angle , and the received signal will contain information on the properties of the scattering target that are sensitive to those quantities and their modulations or variations . SAR interferometry has the potential to provide the requisite data . Next , we examine existing or planned space systems that have the potential to generate topographic data , and suggest that all of these are weak in one or more key aspects for the generation of high-resolution global topographic data and , especially , surface change data . Come next spring , you can refer to your list or drawing to find the newest plants in your garden . He also writes regularly for the Times Literary Supplement on German issues , political and literary , with to date some fifty-five contributions . SAR interferometry has the potential to provide that data set . While the signal in this portion of the electromagnetic spectrum is sensitive to snow grain size and impurities , it is not sensitive to wetness and is sensitive to water equivalence only for shallow snow packs . SAR interferometry has the potential to warn of impending eruptions , mitigating the impact on lives and property . SAR interferometry has proven capable of detecting the grounding line that separates floating from grounded ice in Antarctica , and should be very sensitive to any changes ( Goldstein et al ., 1993 ; also see cover image ) . At bottom left , asphalt grafting compound is applied to a completed whip graft to prevent wood tissues from drying out . Since different radar frequencies and polarization combinations are sensitive to different layers of a forest canopy , it should be possible to use multiple channels of SAR data to estimate total above-ground biomass . The distribution of different vegetation species in coastal wetlands , especially estuaries , is highly sensitive to levels of tidal inundation .