GEE（Google Earth Engine） ee.List.sequence、ee.image.toArray(axis)和协方差矩ee.Reducer.centeredCovariance()

方法1：

ee.List.sequence(start, end, step, count)

Generate a sequence of numbers from start to end (inclusive) in increments of step, or in count equally-spaced increments. If end is not specified it is computed from start + step * count, so at least one of end or count must be specified.

以 step 为增量或以 count 等距增量生成从开始到结束（包括）的数字序列。如果未指定结束，则从开始 + 步长 * 计数开始计算，因此必须至少指定结束或计数之一。

Arguments:

start (Number)

end (Number, default: null)

step (Number, default: 1)

count (Integer, default: null)

Returns: List

方法2：

ee.image.toArray(axis)

Concatenates pixels from each band into a single array per pixel. The result will be masked if any input bands are masked.

将每个波段的像素连