The purpose of this project is to map and estimate temporal change in the tree canopy coverage in Orange County from 1986 to present. Moderate resolution Landsat images will be used to map tree cover using remote sensing techniques at approximately 10-year intervals: 1986, 1996, 2006 and 2016. Analysis of Landsat images will produce a measure of temporal change over four decades, and analysis of recent high-resolution imagery will accurately show present-day tree cover.