1. A method for analyzing building sensor data, the method comprising: receiving building sensor data for a building, the data comprising a plurality of values over time for a plurality of sensors; determining phase and magnitude values associated with one or more sensors of the plurality of sensors based on a spectral analysis technique applied to the building sensor data; and generating a visualization based on at least one of the phase or magnitude values associated with the plurality of sensors, the visualization comprising an overlay upon a building floorplan, the overlay depicting at least one of the phase or magnitude values associated with the plurality of sensors, the method performed by a building energy management system comprising one or more computing devices.