Hello
I would like to create nicely filled polygon maps with my data, but unfortunately every Polygon is filled with a color even if there is no data available for that specific region (see Bad.jpg). I would rather like to have something like in (see good.png), where areas with no data are not filled at all (white or blank). Thanks!
Best Regards,
Alex
Oct 9, 2015 8:45 PM
This is contrary to my normal experience with Tableau. Tableau does not plot data where none exists. Can you attach a packaged workbook (.twbx) illustrating your problem? See Anonymize your Tableau Package Data for Sharing if applicable.
Oct 10, 2015 6:34 PM
First, let's understand why Tableau plotted the areas on the map in the first place. You say "there is no data," but in fact there is data - there is a set of coordinates defining the polygon. That is data for that polygon, so it is mapped.
The field you have on color ([Size]) is from a different data source, and for that particular field, in the secondary data source, there is no data, so that field appears as NULL. To remove all the polygons with a [Size] = NULL, just drop SUM([Size]) on the filters shelf, select Special, and "non-null values." Your view will now look like your "good" image.
I hope that helps.
Oct 13, 2015 8:24 AM
Because your follow-up question was unrelated to the original question, I branched it to a new thread.
bl