Tableau Maps - Custom shapes / polygon - Basics
To draw custom shapes in Tableau, you have to first understand how the custom shapes works within tableau.
Image-1 : Polygon shapes in Tableau
1. Each shape is a polygon.
2. Each point_id links to a co-ordinate( i.e lattitude,longitude).
3. The point_id value is used to tell tableau the order (or path) in which the polygon has to be drawn.
4. So in the above example SatisticalArea = "area-1" has more than 1 shape and see how the polygon_IDs are different and for each polygon_ID the point_id are in a sequential order.
This how a sample data looks like
Attached is the result from tableau (just has custom shape of few areas)
Here is an working Example - Ven_Custom_Shapes_Example