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At that point , caterpillars have grown to about 1 to 2 inches in length . The recent Kobe earthquake in Japan hints at the magnitude of disaster when a large earthquake strikes an urban center . For these reasons , stereo-optical data would likely be acquired in a piecemeal fashion , slowly building up coverage from a variety of missions with different orbits , tracking accuracies , illumination conditions , and correspondingly different ground height accuracies . The varieties we purchase at the grocery store — ' Bartlett , ' ' Bosc , ' and the pricey Asian pears — are not hardy here . As discussed in more detail below , to measure surface displacement to this precision requires a relatively accurate a priori estimate of topography in the region and information on the position and orientation of the antennas during each image acquisition . Knowledge of antenna baseline length B and orientation implies accurate knowledge of the orbital parameters of the spacecraft and spacecraft orientation during each image acquisition . In severe cases , the layover and shadowing produced by mountainous terrain makes classification inappropriate for these regions unless azimuth and viewing geometry have been carefully considered in the SAR sampling strategy . For these reasons , it is necessary to acquire dense temporal and spatial sampling of crustal movements . Plant vines at the same depth as in the nursery . Snow and ice play important interactive roles in regional climates , because snow has a higher albedo than any other natural surface . We then discuss the potential of existing or planned SAR systems for these applications . Remove individual flowers as they fade by cutting them off behind the stem swelling at the base of each bloom .