This map comes from Solstice: An Electronic Journal of Geography and Mathematics (Volume VII, Number 1, 1996) at the University of Michigan. Authors John Nystuen, Rhonda Ryznar, and Thomas Wagner utilized Landsat imagery to do an fascinating analysis of a greening Detroit, which was largely due to increased vacancy and natural regrowth on abandoned structures.
Figure 1. Landsat change image of Detroit showing changes in urban greenness from 1975 to 1992. Imagery and analysis are joint ventures between Environmental Research Institute of Michigan (ERIM) and The University of Michigan, College of Architecture and Urban Planning. Green areas show tracts with greenness increase; red areas with greenness decrease; black areas, no change. Change data derived from TM 1992 and MSS 1975 images of vegetation reflectance.