View from space of the city of Houston, Texas at night. The image depicts the roughly 100 kilometer (60 mile) east-west extent of the Houston metropolitan area. Houston proper is at image center, indicated by a "bull's-eye" of elliptical white to orange-lighted beltways and brightly lit white freeways radiating outwards from the central downtown area. Suburban and primarily residential urban land uses are indicated by both reddish-brown and gray-green lighted regions that reflect a higher proportion of tree cover and lower light density. Petroleum refineries along the Houston Ship Channel are identified by densely lit areas of golden yellow light.