A device may receive first data items and second data items that may have been output by sensor devices. The device may add, to a node in a data structure, at least some of the first data items. The device may divide the node to create subnodes that correspond to subregions of a geographic region. The device may add, to at least one of the subnodes, at least some of the second data items. The device may generate a probability of a first relationship, between the first data items and the second data items, based on determining subnodes that include a first data item and determining subnodes that exhibit a predefined second relationship with a second data item. The device may send, to another device, the probability of the first relationship to support location-based services.