To create a buffer map in Tableau, you can follow these steps:

  1. Prepare your data: Make sure you have geographic data in your dataset, such as latitude and longitude coordinates or address information.
  2. Connect your data: Open Tableau and connect to your data source that contains the geographic information.
  3. Create a map: Drag and drop the geographic data fields (latitude/longitude or address) to the “Columns” and “Rows” shelves. Tableau will automatically recognize the data as geographic and display a map.
  4. Define the buffer distance: To create a buffer around specific points or areas on the map, you’ll need to define the buffer distance. This can be done by creating a parameter or using a calculated field. For example, you can create a parameter called “Buffer Distance” and set the desired distance value.
  5. Create the buffer: In Tableau, go to the “Analysis” menu and select “Create Calculated Field”. In the calculation editor, write a formula that uses the buffer distance parameter or calculated field to create the buffer. For example, the formula could be something like: “ST_Buffer([Geometry Field], [Buffer Distance])”, where [Geometry Field] represents the geographic field in your data.
  6. Add the buffer to the map: Drag and drop the calculated field containing the buffer calculation to the “Marks” card in Tableau. Choose the appropriate mark type, such as “Polygon” or “Circle”, and adjust the size, color, and other visual properties as desired.
  7. Customize the buffer appearance: You can further customize the appearance of the buffer by adjusting the transparency, border color, and other visual settings. Use the formatting options available in Tableau to make the buffer visually appealing.
  8. Analyze and interact with the buffer map: With the buffer map created, you can now analyze and interact with the data. You can filter, highlight, and drill down into specific areas within the buffer to gain insights from your data.

By following these steps, you can create a buffer map in Tableau to visualize and analyze geographic data with buffer zones.


The Data School
Author: The Data School