Description: Using 2015 aerial photography, GeoTerra provided a photogrammetric based (imagery) update of the impervious surface datausing the most efficient method. A visual review of the area is performed comparing 2012 and 2015 imagery for impervious surface changes. New impervious surface areas will be collected and merged seamlessly as possible with the existing data set. No updates were performed for original data where no impervious surface change has occurred since the last update.
Copyright Text: King County Aerial Photo Project, GeoTerra, City of Mercer Island