Study on Measurements of Spatial Scale Perception in Old City Streets and Alleys: Taking Sanyanjing Hutong and Zhuanta Hutong as Examples

The construction of streets and alleys in old cities corresponds to the behavior of folks living there, and the spatial scales arised from their construction rules generates the perception object of built environments in old cities, for example, the spatial scales of Beijing's hutongs constitute the core of perceiving the history and culture of the old city. With the improvement of preservation of Beijing's old city streets and alleys, to highlight and perpetuat the unique history and culture of the old city, the static maintenance to existing physical forms of the old city has been transfoomed to the dynamic renewal of street space, the control of spatial scales has thus become the basis for continuous dynamic renewal. Unlike directly quantifiable spatial dimensions, spatial scales which contain construction rules, are reflected in folk's subjective perception and have close relations with the speed of the perceiving subject's behavior; sinultaneously, spatial scales also have their constituent elements and rules. The leading part of the construction rules of spatial scales was focused, i.e., the measurement of the subjective perception for spatial scales was studied, and the perceived scales were restricted in the pedestrian environment of street construction. Based on that, two representative residential hutongs in the old city of Beijing were selected as research objects, and virtual reality experiments combined with psychological cognition were conducted on the platform of quantitative modeling through spatial data scanning and element extraction, in order to obtain the measurement for construction rules of spatial scales at walking speed.