When maps’ transformative potential is brought into play by spatial design disciplines, maps and design cross over in a complex, creative, and productive relationship. This book chapter addresses this fertile terrain and uses recent research to discuss three distinct approaches to operative mapping in design: spatial mapping to reveal site opportunities based on graphic operations; temporal mapping to understand dynamic behaviour based on data gathering from events; and experiential mapping to expand urban visions based on subjective/collective citizen desires with crowdsourced data and citizen science experiments.