Description: Tree canopy was derived from 2016 NAIP, 2014 Orthoimagery, and 2013 LiDAR, high-resolution remotely sensed data. Object-based image analysis techniques (OBIA) were employed to extract potential tree canopy and trees using the best available remotely sensed and vector GIS datasets. OBIA systems work by grouping pixels into meaningful objects based on their spectral and spatial properties, while taking into account boundaries imposed by existing vector datasets. Within the OBIA environment a rule-based expert system was designed to effectively mimic the process of manual image analysis by incorporating the elements of image interpretation (color/tone, texture, pattern, location, size, and shape) into the classification process. A series of morphological procedures were employed to insure that the end product is both accurate and cartographically pleasing. Following the automated OBIA mapping a detailed manual review of the dataset was carried out at a scale of 1:2500 and all observable errors were corrected.
Service Item Id: 78f4c7a3fa8a4c2d8fa4902dd1550b4f
Copyright Text: University of Vermont Spatial Analysis Laboratory in collaboration with the Trust for Public Lands, the City of Cambridge and the City of Boston.