This dataset is a polygon representation of the significance of vegetation communities within the upper Derwent Estuary wetlands of Tasmania. It has been developed as a management tool and is derived from the Vegetation layer of the same project. Each polygon represents the significance of a single vegetation community based on the conservation status of that community. Vegetation communities were identified to a 1ha resolution or to 0.25ha where a threatened vegetation community was suspected. This dataset is one of three produced for the upper Derwent Estuary wetlands for the Derwent Estuary Program

This data set is derived from the Vegetation layer of the same project by allocation of the conservation priority (“significance”) given to each vegetation community based on its conservation status.

Position Accuracy: Supporting field data was collected with the assistance of a GPS receiver and hard copy maps of digitised vegetation communities. Orthoimages used in the mapping process were 1:24000 with accuracy generally in the order of ±2m (absolute accuracy ±5m in some place ). Attribute Accuracy: Attributes accurately reflect the conservation status of the underlying vegetation communities at the time of completion. Logical Consistency: The dataset has been checked for general topological errors with MapInfo 8.5 (all overlaps, gaps & self-intersections corrected). All objects are attributed with valid values. Completeness: COMPLETENESS OF COVERAGE The study area encompasses the wetlands in the upper Derwent River Estuary between Boyer and Bridgewater on the north side of the Derwent River and Sorell Creek and Granton on the south side of the River. The full extent of the wetlands has been mapped. All islands in the vicinity have also been mapped. COMPLETENESS OF CLASSIFICATION 100 percent Additional: Vegetation Community and Weed Mapping - Upper Derwent Estuary Wetlands September 2008, For Derwent Estuary Program, North Barker Ecosystem Services available from the Derwent Estuary Program.