Google Earth Engine（GEE）——影像集合的限制使用

limit(max, property, ascending)

Limit a collection to the specified number of elements, optionally sorting them by a specified property first.将一个集合限制为指定数量的元素，可以选择先按指定的属性进行排序。

Returns the limited collection.

Arguments:

this:collection (Collection):

The Collection instance.

max (Number):

The number to limit the collection to.

property (String, optional):

The property to sort by, if sorting.

ascending (Boolean, optional):

Whether to sort in ascending or descending order. The default is true (ascending).

Returns: Collection

size()

Returns the number of elements in the collection.

Arguments:

this:collection (FeatureCollection):

The collection to count.

Returns: Integer

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