Announcement: All noncommercial projects registered to use Earth Engine before
April 15, 2025 must
verify noncommercial eligibility to maintain Earth Engine access.
ee.ImageCollection.union
Stay organized with collections
Save and categorize content based on your preferences.
Merges all geometries in a given collection into one and returns a collection containing a single feature with only an ID of 'union_result' and a geometry.
| Usage | Returns | ImageCollection.union(maxError) | FeatureCollection |
| Argument | Type | Details | this: collection | FeatureCollection | The collection being merged. |
maxError | ErrorMargin, default: null | The maximum error allowed when performing any necessary reprojections. If not specified, defaults to the error margin requested from the output. |
Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.
Last updated 2023-10-06 UTC.
[null,null,["Last updated 2023-10-06 UTC."],[[["\u003cp\u003eCombines all geometries within a FeatureCollection into a single, unified geometry.\u003c/p\u003e\n"],["\u003cp\u003eReturns a new FeatureCollection containing one feature with the merged geometry, identified by 'union_result'.\u003c/p\u003e\n"],["\u003cp\u003eAccepts an optional \u003ccode\u003emaxError\u003c/code\u003e parameter to control the accuracy of reprojections during the merge process.\u003c/p\u003e\n"]]],[],null,["# ee.ImageCollection.union\n\nMerges all geometries in a given collection into one and returns a collection containing a single feature with only an ID of 'union_result' and a geometry.\n\n\u003cbr /\u003e\n\n| Usage | Returns |\n|---------------------------------------|-------------------|\n| ImageCollection.union`(`*maxError*`)` | FeatureCollection |\n\n| Argument | Type | Details |\n|--------------------|----------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------|\n| this: `collection` | FeatureCollection | The collection being merged. |\n| `maxError` | ErrorMargin, default: null | The maximum error allowed when performing any necessary reprojections. If not specified, defaults to the error margin requested from the output. |"]]