Abstract: A method, apparatus and computer program product are provided to generate or modify information about a navigable area of an indoor space. In the context of a method, location data is received or determined for a plurality of location trace snippets associated with one or more mobile devices. Each location trace snippet of the plurality of location trace snippets respectively represents a plurality of respective locations of a respective mobile device within the indoor space over a respective limited period of time. The respective limited period of time associated with a location trace snippet may be defined based upon satisfaction of a trigger condition. Based on the location data for the plurality of location trace snippets, the method also generates or modifies information about one or more navigable areas of the indoor space.