利用卫星测量冰雪范围，并计算出照射地面的日光值，最后绘制出上面的图像。
The maps were made by combining satellite measurements of snow and ice extent with calculations of the amount of sunlight reaching the ground during the season.
在过去的十年中，科学家利用卫星测量海洋的颜色，以确定浮游植物在全球的分布…
Physical processes, like ocean circulation and upwelling, help to regulate the distribution and abundance of the plants.
这颗卫星利用地面对激光的反射，让研究人员以极高的精度测量地形。
The satellite bounces laser light off the ground, allowing researchers to measure the terrain with extraordinary precision.
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