Name: landcove

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Type: Raster Layer

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Description: High resolution land cover dataset for Cook County, IL. Seven land cover classes were mapped: (1) tree canopy, (2) grass/shrub, (3) bare earth, (4) water, (5) buildings, (6) roads, and (7) other paved surfaces. The minimum mapping unit for the delineation of features was set at Sixty-Four square feet. The primary sources used to derive this land cover layer were 2008 LiDAR data and 2010 NAIP imagery. Ancillary data sources included GIS data provided by Cook County or created by the UVM Spatial Analysis Laboratory. This land cover dataset is considered current as of Summer, 2010. Object-based image analysis techniques (OBIA) were employed to extract land cover information 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 1:3,000 and all observable errors were corrected.

Copyright Text: University of Vermont Spatial Analysis Laboratory in colaboration with the Chicago Metropolitan Agency for Planning, the Field Museum, and Cook County, IL.

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