A system to update a data structure based on a plurality of parent data structures, where at least one of the plurality of parent data structures is associated with point data. Some embodiments may include reception of a notification to update from one of the plurality of parent data structures, determination that one or more of the plurality of parent data structures is updating, determination of whether a notification to update has been received from each of the one or more of the plurality of parent data structures, and, if the notification to update has been received from each of the one or more of the plurality of parent data structures, update of the data structure based on data of the one or more of the plurality of parent data structures.