Google Earth Engine（GEE）——利用sentinel2影像计算不同月份指定区域的MNDWI总和并用chart进行结果展示

利用sentinel2 影像计算指定区域内的MNDWI总和，这里主要是练习多个函数的应用，以及如何构建一个时间序列来查看不同月份的mndwi的总和。

函数：

ee.ImageCollection.fromImages(images)

Returns the image collection containing the given images.

Arguments:

images (List):

The images to include in the collection.

Returns: ImageCollection

ee.Filter.calendarRange(start, end, field)

Returns a filter that passes if the object's timestamp falls within the given range of a calendar field. The month, day_of_year, day_of_month, and day_of_week are 1-based. Times are assumed to be in UTC. Weeks are assumed to begin on Monday as day 1. If end < start then this tests for value >= start OR value <= end