长期以来，研究植物的科学家采用卫星测量植被的新鲜指数，即观测植物反射阳光值，预测植物的状态。 植物新鲜指数的变化是季节性的。
Scientists who study plants and trees from space have long relied on satellite-derived measures of “greenness”—that is, observations of the amount of sunlight reflected by vegetation.
试验结果表明，在单对数坐标中土壤的微波反射损失随其圆锥指数增加而呈线性减少。
The results show a definite correlation between the microwave reflection loss and soil strength expressed in term of cone index.
主要指标水肿指数e和信号宽度W及反射图的形态特征。
Main Outcome Measures Edema index (e value), signal width value (w value) and features of reflectance pictures.
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