ee.Feature.union

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Returns a feature containing the union of the geometries of two features.

UsageReturns
Feature.union(right, maxError, proj)Feature
ArgumentTypeDetails
this: leftElementThe feature containing the geometry used as the left operand of the operation. The properties of the result will be copied from this object.
rightElementThe feature containing the geometry used as the right operand of the operation. The properties of this object are ignored.
maxErrorErrorMargin, default: nullThe maximum amount of error tolerated when performing any necessary reprojection.
projProjection, default: nullThe projection in which to perform the operation. If not specified, the operation will be performed in a spherical coordinate system, and linear distances will be in meters on the sphere.