Joins are used to combine elements from different collections (e.g.
ImageCollection or FeatureCollection) based on a condition
specified by an ee.Filter. The filter is constructed with arguments for
the properties in each collection that are related to each other. Specifically,
leftField specifies the property in the primary collection that is related
to the rightField in the secondary collection. The type of filter (e.g.
equals, greaterThanOrEquals, lessThan, etc.)
indicates the relationship between the fields. The type of join indicates one-to-many
or one-to-one relationships between the elements in the collections and how many matches
to retain. The output of a join is produced by join.apply() and will vary
according to the type of join.
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Last updated 2021-05-26 UTC.