The Great Lakes Aquatic Habitat Framework (GLAHF) contains two primary data resources: an aquatic habitat spatial framework and a database. GLAHF's spatial framework allows for the standardization of geospatial data to a hierarchically nested set of grid cells to be used as building blocks for informing management decisions and developing other spatial products such as aquatic habitat classification, nearshore assessment, and decisions support tools. The GLAHF spatial framework is a nested grid system starting with a 9km grid covering the entire Great Lakes Basin. The nested grid is divided into two zones--offshore and coastal--and can be considered at a broad scale or subdivided to accommodate finer scale data. GLAHF's spatial database is full of administrative, biological, environmental and chemical, geomorphology, hydrology, landscape, mechanical energy, and temperature energy data.