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CPC......... G08B 13/00; G08B 21/22; G05B 15/02 the sensor. Data about an event detected at a first sensor is USPC............ 340/501, 566,505,539.26, 540, 541; compared with events detected at other sensors in order to 348/148,500, 164,461, 218.1, 584, identify correlated events from which connections between 348/E5. 024, E9. 055; 370/503: 455/4.56. 1 the sensor locations can be inferred and a building layout See application file for complete search history. generated. In some embodiments a threshold may be applied to the data in order to filter out false events. In some embodi