While partners provided latitude and longitude where each event occurred, the location where emissions are released to the atmosphere may dier by 10s of meters from the reported maintenance event location. For example, a well unloading may be reported by the wellhead location, while the venting of gas may occur at tanks on the wellpad. It was therefore important that all facilities had geospatial outlines, particularly for large well pads and midstream facilities. Events and plumes were both matched to facilities; any plume on a facility matches any event on the same facility if overight and event timing aligned.