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Branches that have relatively wide crotch angles are also stronger and better able to support the weight of the crop . Hindrances to use of SAR systems have included : ( 1 ) difficulty of understanding the information content of the complex phase and amplitude information recorded in multifrequency , polarimetric SAR data ; ( 2 ) the lack of available , calibrated data over sites of interest ; ( 3 ) the lack of accessible computer software to exploit the information present in the data ; and ( 4 ) certain characteristics of SAR data , including relief displacement and image speckle . The first symptom of the disease is vein clearing , the loss of chlorophyll or green pigment in the leaf veins . Lost business was due to the reduced transportation infrastructure ( mainly bridge and freeway collapse ) and associated delays , closed buildings and factories , lost production , increased insurance rates , and the uncertainty and loss of confidence by the business community . We envision a global system in which SAR images will be acquired and interpreted on a time scale useful for forecasting eruptions , reducing loss of life and increasing our understanding of volcanic processes . Chapter outlines key science questions in the context of Mission to Planet Earth that can be addressed with SAR data . Branches that grow more vertically often break away from the tree under the weight of fruit . In addition , steep slopes facing away from the radar will either have a lower SNR , causing large errors in phase-difference determination , or will be in shadow , causing loss of data . Destruction of the lichen or other sparse plant life can lead to extensive damage to the ecosystem through promotion of soil erosion , loss of primary productivity , and destruction of the matted structure of the existing soil . Better spatial sampling will allow better resolution of short wave-length features of the deformation field .