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As more people add pears to their gardens , this situation may change . If each pixel on the ground behaves the same for each observation , calculating the difference in the phases removes dependence on the scattering mechanism and gives a quantity dependent only on imaging geometry . Given that there are about 1,000 potentially active volcanoes in the world , it is not possible in the foreseeable future to monitor them all with ground-based methods . A cleft graft , bottom right , covered with asphalt grafting compound is used for topworking established apples and pear trees . This reduces the inoculum source and minimizes the possibility of infection .