这是因为大面积雪盖的高反射特性（北半球的冬季，雪可覆盖到40％的陆地表面）。

This is because of the highly reflective nature of snow combined with its large surface coverage (snow can cover up to 40% of the Earth's land surface during the Northern Hemisphere winter).

youdao

根据遥感数据获得的雪盖消融曲线是输入到融雪径流模型中一个最重要的参数，云是影响积雪解译精度的主要因素。

The snow Cover Depletion Curve based on remote sensing is one of the most important parameters of snow-runoff simulation models. Cloud is the major factors that affect the accuracy of snow mapping.

youdao