Parks and green space are an essential element to the quality of life for many people. A shift from the suburbs back to cities has placed greater emphasis on providing clean, safe and accessible park space. The Trust for Public Land has created a tool, ParkScore, to evaluate city park systems using three different measures: acreage, access and investment. The tool, which uses advanced GIS mapping, can be used by cities to identify areas in which they need to improve and as the basis for comparing themselves to others.