{"__v":3,"_id":"5617bd3a26e3db230054fba4","category":{"__v":7,"_id":"54fdad6e660db63700c23b82","pages":["55fbef82af72eb0d0007df93","55fbf623e013770d008fcba8","5617bd3a26e3db230054fba4","5617c4a6f8c9632100ac74f5","561ed6fd0a04340d00d8a0b0","562156adf4e0352100cbf268","562a5c846049f20d0032520b"],"project":"54d0fd1d095c470d00d1646d","version":"54d0fd1e095c470d00d16470","sync":{"url":"","isSync":false},"reference":false,"createdAt":"2015-03-09T14:25:50.133Z","from_sync":false,"order":2,"slug":"api-reference","title":"API Reference"},"project":"54d0fd1d095c470d00d1646d","user":"54db5301eb78f13900cf108b","version":{"__v":20,"_id":"54d0fd1e095c470d00d16470","project":"54d0fd1d095c470d00d1646d","createdAt":"2015-02-03T16:53:50.090Z","releaseDate":"2015-02-03T16:53:50.090Z","categories":["54d0fd1e095c470d00d16471","54d8b5e68934140d00496544","54db6361c6a4d40d0034b8f7","54db638208ea010d00ab1fdd","54db639008ea010d00ab1fde","54db6547c6a4d40d0034b8fd","54db83482092743700ea6ee1","54db84afc6a4d40d0034b93c","54db8805c6a4d40d0034b93f","54db8de9c6a4d40d0034b961","54db931ac6a4d40d0034b96d","54e49219e4365521006fd9ee","54e74fcc652d7c1900cbe737","54e74ffd3c1e111700d05762","54e77e0a523b1b2f00e6f313","54e784affdabe62500fcddcf","54e784fa523b1b2f00e6f319","54e785de8ae8911900cd42c5","54fdad6e660db63700c23b82","54fdff31f7b1202100a25e06"],"is_deprecated":false,"is_hidden":false,"is_beta":false,"is_stable":true,"codename":"","version_clean":"1.0.0","version":"1.0"},"updates":[],"next":{"pages":[],"description":""},"createdAt":"2015-10-09T13:12:26.298Z","link_external":false,"link_url":"","githubsync":"","sync_unique":"","hidden":false,"api":{"results":{"codes":[]},"settings":"","auth":"required","params":[],"url":""},"isReference":false,"order":50,"body":"A request to union API will return a GeoJSON encoded geometry as result of a spatial union operation over the geometries from the selected document list. This document selection could be done by a spatial or relational filter. \n\nTo define the document list, first you must inform the collection from which the documents will be obtained and then you need to filter the desired documents. There are two ways to apply this filter. You can filter by using a GeoJSON (spatial filtering), or using a relational filter over a collection column (as the IN relational clause).\n\nThe return of union operation contains a geometry (GeoJSON) resulting from the union operation on the document list geometries, and optionally, additional information (relational data) from documents that have been processed.","excerpt":"","slug":"geometry-union","type":"basic","title":"Geometry Union"}
A request to union API will return a GeoJSON encoded geometry as result of a spatial union operation over the geometries from the selected document list. This document selection could be done by a spatial or relational filter. To define the document list, first you must inform the collection from which the documents will be obtained and then you need to filter the desired documents. There are two ways to apply this filter. You can filter by using a GeoJSON (spatial filtering), or using a relational filter over a collection column (as the IN relational clause). The return of union operation contains a geometry (GeoJSON) resulting from the union operation on the document list geometries, and optionally, additional information (relational data) from documents that have been processed.