In Tableau 2018.2, spatial joins were added. What this means is, that you can join spatial fields from Esri Shapefiles, KML, GeoJSON, MapInfo Tables, Tableau Extracts, and SQL Server. In order to do so, you have to select the Intersects field from the join dropdown. For more information please read https://www.tableau.com/about/blog/2018/8/perform-advanced-spatial-analysis-spatial-join-now-available-tableau-92166.
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