本次所用的函数:ee.ImageCollection
filter(filter)
Apply a filter to this collection.对这个集合应用一个过滤器。
Returns the filtered collection.
Arguments:
this:collection (Collection):
The Collection instance.
filter (Filter):
A filter to apply to this collection.
Returns: Collection
ee.Filter
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` O
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