Abstract: A computing device receives a first user input that includes user selection of a first data field of a data source from a schema information region of a user interface and placement of the first data field into a data visualization region of the user interface. When the first data field corresponds to a geographic data field, the computing device determines longitude and latitude information for data values of the first data field. The computing device generates a map data visualization corresponding to the first data field according to the determined longitude and latitude information. The map data visualization includes a first layer having a first set of data marks corresponding to the first data field. The computing device displays, in the data visualization region, the map data visualization including the first set of data marks.

Abstract: A method generates map visualizations with multiple map layers. A user selects a data source with geographic data. A device displays a data visualization user interface, including a schema information region with data fields, and shelf regions that defining characteristics for a data visualization. The user selects a first geographic data, and the user interface generates a map data visualization using coordinates associated with the first geographic data field. The visualization includes a first plurality of data marks in a first layer. The user selects a second geographic data field. In response, the user interface displays a new layer icon. Upon activation of the new layer icon by the second geographic data field, the user interface superimposes a second layer over the existing map data visualization to form an updated map data visualization. The second layer includes a second plurality of data marks corresponding to the second geographic data field.