The soundscape is a critical component of an ecological community, and knowledge of natural ambient sound pressure levels is crucial to assessing impacts of noise. However, the spatial correlation of natural ambient sound pressure levels is largely unknown and a given measurement may not be representative of the locale. Much anthropogenic noise can be considered point or line sources; the spatial correlation of the resulting sound pressure levels can be completely described by directivity and the inverse square law in an isotropic medium. However, most natural sources (wind, birdsong, rain, insects, etc.) may be better described in aggregate as an irregular source with stochastic characteristics. Recently, a 9-day long study collected continuous audio data at 18 locations over a roughly 3.5 s km1 area in Rocky Mountain National Park. Analysis seeks to investigate the spatial variation of natural ambient sound pressure level measurements and the degree to which they are correlated across space. Results will suggest how sparsely an area can be measured as well as placement of a finite number of microphones to best observe the acoustical environment.