To plot GeoJSON, select a single column of GeoJSON blobs, and select the "GeoJSON" checkbox from "Map Data Settings" in the "Series Settings" tab:
Periscope Data requires the value after the "Geometry" key, as seen in purple below, to be selected. Within the Geometry key, the types that are supported are: Polygon, Point, LineString and MultiPolygon.
,"coordinates": [-122.3894, 37.7519]
"name": "Periscope Data's Intergalactic Headquarters"
Additional columns can be selected to specify colors for distinct GeoJSON areas. Once a valid column has been added, it can be checked as the Segmentation value in the Series tab.
The resulting chart applies the specified color to each GeoJSON Area.