Google Earth Engine（GEE）——计算1990-2020年森林损失量面积并导出表格
这次实验的目标是1990-2020年几个矢量集合当中的森林损失量，用到的函数：ee.Reducer.frequencyHistogram()Returns a Reducer that returns a (weighted) frequency table of its inputs.返回一个返回其输入的（加权）频率表的Reducer。forEachBand(image)Creates a Reducer by combining a copy of the given reducer for
