View the original community article here
Last tested: June 2021
This Help Center article explains how to make a topojson file to use in a map layer in Looker.
Remember: The property_key field is CASE SENSITIVE! A custom map layer may be set up and referenced correctly, but the map may display blank if property_key is case mismatched.
map_layer: my_neighborhood_layer {
file: "neighborhoods.topojson"
property_key: "neighborhood"
}
This content is subject to limited support.