Mapping techniques
We've touched on geographic visualization throughout the book. You've seen symbol maps and filled maps. Here, we'll examine an example using a custom geocoding technique and custom shapes to give some idea of what is possible.
Supplementing the standard geographic data
We saw in Chapter 1, Creating Your First Visualizations and Dashboard, that Tableau generates the Latitude and Longitude fields when the data source contains geographic fields, which Tableau can match with its internal geographic database. Fields such as country, state, zip code, MSA, and congressional district are contained in Tableau's internal geography.
However, if you have latitude and longitude in your dataset or are able to supplement your data source with ...
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