This study uses a series of spatial indicators to visualize and quantify eight transit-oriented development (TOD) areas in Portland Oregon and the Silicon Valley in California. Specifically, the report uses a spatial-temporal analysis to measure transit usage, urban form and socio-demographic change prior and subsequent to the incorporation of light rail and transit-oriented development policies in these two regions. One area of focus is the consistency of the urban mobility infrastructure with pedestrian access to the transit stops because the capacity for transit users to walk to and from their transit point of entry is a critical component of the overall TOD concept. Three key techniques to visualize and quantify walkability are presented: street network classification, pedestrian catchment areas, and intersection intensities. The study also introduces the idea of impedance, which is incorporated into each of these measures presenting a refined method of analysis that distinguishes between an auto-oriented and pedestrian-oriented street network.
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