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One measurement of phase change based on two successive images constitutes only one component of the three-dimensional surface displacement vector , specifically the compo-nent projected onto the spacecraft-pixel vector . The good news , however , is that the main differences between grocery store pears and those we can grow here are size and fresh fruit keeping ability . The growth habit is round-headed and spreading . It begins early in the spring when the shoots are about six inches tall . Prune out and destroy any part of the plant that is dead or dying . Beginning in the fourth year , prune out the oldest wood annually in early spring before growth begins . Care must be taken in observing that symptom development is consistent with Botrytis infection . The degree to which vegetation affects the determination of soil moisture depends upon the wavelength , the mass and water content of vegetation , and the vegetation 's structural characteristics as it influences its scattering properties . If the bark temperature gets above freezing , water in the conductive tissue under the bark becomes liquid and begins to flow through the cells . When the ground color begins to change from green to a greenish yellow color , the apple is starting to ripen . Because the effect of orientation errors depends in part on look direction , and because many points on the Earth 's surface will be measured at least once by each system , the systematic errors in the two measurements will be largely independent . Maintain good sanitation practices to prevent problems and to help detect an iris borer problem when it first begins . Wind carries these spores to young leaves , causing more infection . The living and dead biomass in both above and below-ground storage pools constitutes a major terrestrial store of carbon . As with the roughness case , the effect of vegetation on the active microwave sensing of soil moisture is greatly dependent upon the instrument incidence angle , frequency , and polarization . The annual climatological probability of a nadir cloud-free line of sight ( CPncflos ) for laser altimetry or stereo-optical imaging depends on latitude and season .