植被不稳定，植被盖度受当年降水情况影响较大；
The vegetation is unstable and it's covering in a year highly determined by precipitation in the year.
这里的两张图像显示了2月1号到7号（乌拉圭）的降水情况。
可是到外面一看，您会发现明显不是这么回事，并且下面所示的程序将通过仅检测降水情况的特定阈值来修正此行为。
A quick look outside shows this is obviously not the case, and the program shown below will compensate for this behavior by only detecting precipitation events of a certain threshold.
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