Disclosed are approaches for the centralized collection and sharing of “site-centric” data collected at least in part by one or more autonomous vehicles, regularly operating at an operating site, for utilization by the site owner/operator in the performance of its supervisory functions including but not limited to gaseous emissions detection such as methane detection at solid waste landfill sites. For certain such implementations, said collected data may be beyond (and at least partially unrelated to) data collected and/or utilized for other immediate operations performed by the autonomous vehicle such as, for example, actively detecting and mapping methane emissions by an autonomous vehicle that is otherwise performing vegetation management or other tasks unrelated to detecting gaseous emissions.