Jason, please either take off the extract and repost, or post the Excel worksheet. Then I'll take a look. But the answer is yes almost certainly.
Updated files with corrected polygon shapes.
I also noticed that Area 3 is within Area 9. I'm okay changing the color order to get it to display on top, but I am curious if is is possible to have a polygon with a hole cut out of it?
Jason, my count down clock for time allowed to spend on the forums just hit zero. (Not really, but I do have to get this Power Point out the door.) And since you're looking for that cut-out you're getting into Richard Leeke territory. But if he doesn't answer, I'll take a look at the end of the day.
You can't cut holes out of Tableau polygons, The only way to do that is with custom filled maps. The best you can do with polygons is overlay them, as you mention.
If you take a look at the viz embedded at the top of the Viz Talk Grow your own Filled Maps article (too hard to post a link from a phone) I've included a couple of tabs showing what you can do with polygons and what you can do with custom filled maps. It's in the tsunami zones example - that has a couple of extra tabs that show that.
Thanks Shawn and Richard.
I think I can settle with the overlapping polygon for now. I suppose I could define the outer polygon such that it "cuts" towards the center, goes around the interior "hole", and then follows the "cut" line back to the exterior.
Still struggling on how to get my custom polygon shapes (sub areas of province) to show up as a backdrop while also showing individual town data (services offered).
The layers would be from bottom to top: Tableau default map, my custom provincial divisions (filled map), my town point data (symbol map).
I can't seem to get a dual axis to work to display both a filled map and a symbol map at the same time. Hopefully my own WMS server isn't the only option?
The solution was provided by Tableau Tech Support.
1. Union the Polygon data with the Town Details data
2. Create a map with dual axis on the Latitude (one being a filled map of the polygons, and the other a "Automatic" showing the towns as circles). You then have to adjust the marks individually to format them.
Attached is an example.
00195986.twbx.zip 19.8 KB