A description of the second-order spatial coherence based on the theory of spatial coherence wavelets is presented. Such description is performed in the classical context of optical fields and chaotic sources. The concepts of radiant and virtual point sources are introduced. This theory suggests that the second-order spatial coherence state of light can be described in terms of three layers of point sources; a strategy that can increase the performance of numerical algorithms. The modulation in coherence found is similar to that measured in Hanbury-Brown and Twiss effect for binary stars .