Figure 4

Locations of the 29 selected parks in the urban region of Beijing, China.
All parks are located within the 5th loop (urban region), except for Xiaoyue Country Park. The Beijing municipal loop starts from the center (with an initial number of 2), moving outwards (the outermost number is 6). The base map is OpenStreetMap © OpenStreetMap contributors (URL: http://www.openstreetmap.org/export#m ap = 12/39.8602/116.3507&layers = H), The cartography in the OpenStreetMap map tiles is licensed under CC-BY-SA 2.0 (www.openstreetmap.org/copyright). And the map was processed by ArcGIS 10.2(URL: http://www.esri.com/).