There are two types of catchment areas – Polygon and Single Point catchment areas – and the way to set up your file for those two types of catchment areas differ slightly.

Polygons:

Each set of Latitude and Longitude in a polygon represents the points that will make up the polygon.

Single Point:

This is the same way that you will set up the file for uploading custom POIs, with the only difference being uploading it as “Catchments” instead of “POIs” on the upload screen. To set the radius around your single point catchment areas, refer to How to customise the radius around my Single Point custom catchment areas.