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However , with appropriate selection of orbital parameters , adequate distribution of ground-station facilities , and improved raw data-storage capabilities on the spacecraft , these techniques provide essentially global coverage , allowing us to sample all major exposed seis-mic zones in the world . Space-based topographic data will enable us to acquire a basic description of features with broad spatial scales , such as entire drainage networks , that have been poorly served by the available data . It occurs in both indoor and outdoor plants , but is much more common indoors . Once the tree has rough and flaky mature bark , neither winter sun nor chewing animals can harm it , so tree guards will not be necessary . The stems , leaves , and buds can be affected by both diseases . Remove individual flowers as they fade by cutting them off behind the stem swelling at the base of each bloom . An essential piece of information that still eludes us , even in thoroughly studied and instrumented areas such as southern California , pertains to the correct prediction of the locations of future earthquakes . Neither the synoptic view nor controlled geometry of a space platform are attainable by airborne or ground techniques , while problems of air space restrictions disappear with a space platform . In principle , all three compo-nents of surface displacement could be obtained from space ; in practice , we are only likely to obtain at most two , if data from both the ascending and descending passes of the satellite are available . Cankers may appear along the stems and cause them to fall over . When purchasing an apple or pear tree , you should know both the scion and the rootstock you ’ re getting . Even marine seismic zones may be indirectly observable with the SAR technique , in the sense that geodetic observations in coastal regions experiencing seismic-cycle strain accumulation and release may help us understand subduction-zone earthquake processes . Water them well and trim off dead or damaged wood . When planting new materials , choose those which have resistance to powdery mildew , and space them far enough apart to allow good air circulation and adequate light . If only a few plants are affected , handpick and kill the adults ( e.g ., drop them into a pail of soapy water ) . Although it may be difficult to make yourself remove fruit , the quality of the apples or pears you will harvest in the fall will be greatly improved by thinning . For example , multiple images of the same area may allow discrimination of true volcanic deformation from atmospheric effects , the latter being highly variable in both space and time .