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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 . Stem rot may also develop , producing water-soaked or blackened areas on the stem near the soil line . In less severe cases , the ancillary digital elevation data have been used to generate approximate corrections for terrain effects prior to classification . The goal in pruning fruit trees is to develop and maintain this conical form , always keeping the central leader the tallest and most vigorously growing shoot , and allowing the lowest branches to spread the widest . If environmental conditions are favorable for disease development , the fungus can spread through most of the root system within 7-10 days , causing death of the plant . Interferometric measurement capabilities uniquely provided by SAR are required to generate global topographic maps , to monitor surface topographic change , and to monitor glacier ice velocity and ocean features . Often , if all the flowers are left to develop into berries , berries will be small and late ripening and plants will have little new growth . It is important to note that differential interferometry requires a high-quality DEM before centimeter-level changes can be detected . This bacterial disease has the potential to spread quickly and damage — or even kill — unprotected trees . Thus , it will likely be necessary to use the three-pass approach with ERS-1 and ERS-2 for those observations to generate initial topographic data accurate enough for interferometric change detection . Put a little soil in the bottom of the container ; plant each bulb , making sure to spread the roots evenly . ( Note that the conservative performance estimates in Table 8.2 have not assumed this synergism nor any resulting reduction in systematic error due to platform orientation . Note that SAR interferometry meets all known requirements . Pack the soil firmly around the roots , then mulch the planting with 2 to 4 inches of sawdust , peat moss , or chopped straw . During the first three years of growth , allow four or five canes to develop per year , removing only weak or damaged wood . Spread the roots of bare-root stock , making sure none are bent . Flowers often fail to develop color , remain green and distorted , and seeds or fruit never develop .