ABSTRACT

United States ................................................................................................. 218 8.3 Methods ........................................................................................................ 219

8.3.1 Approaches to Estimating the Extent of Irrigated Urban Vegetation ......................................................................................... 219

8.3.2 Remote Sensing Approach ................................................................220 8.3.3 Housing Data Approach ................................................................... 221

8.4 Results and Discussion ................................................................................. 227 8.4.1 Total Turfgrass Area ......................................................................... 227 8.4.2 Urban Irrigated Area ........................................................................ 231 8.4.3 Recent Growth Trends of Turfgrass Area vs. Irrigated

Cropland Area ................................................................................... 233 8.5 Conclusion .................................................................................................... 233 Acknowledgments ..................................................................................................234 References ..............................................................................................................234

Monitoring of irrigated areas is of critical importance for ensuring global food security and managing the sustainable use of freshwater resources. As such, mapping efforts in irrigated areas have traditionally focused on agricultural irrigated areas