Zoning & Walkability Lab — Urban Land-Use Simulator

Paint a nine-by-nine city block with residential, commercial, industrial, green and heritage-cultural zones and watch three real planning metrics update live: a gravity-model walkability score (the same accessibility mathematics transportation planners use to judge whether homes sit within a comfortable walk of shops and parks), a Shannon-entropy mixed-use diversity index (a standard smart-growth measure of whether a neighbourhood mixes uses instead of segregating them into single-use districts), and a composite community well-being score that rewards walkable, diverse, green-adjacent development and penalises residential blocks placed too close to industrial noise and pollution. Adjust the walk-decay and green-space-weight sliders to see how planning priorities change which layouts score well, and use the random starter plan or full reset to explore how different urban design choices reshape the same city block.