The Orthophoto Wetlands and Streams datalayers comprise a polygon coverage and a line coverage. They are registered to, and tiled by, the Orthophoto Quad Library . In ARC, the corrected coverages are then mapjoined and clipped by the boundary of a State Plane Coordinate grid cell which represents a 4 kilometer by 4 kilometer orthophoto sheet. An AAT exists in the Wetlands polygon coverage.
All arcs represent streams.
These datalayers are being developed by DEP GIS group. The datalayers are currently under development. Data production is complete in the Wachusett, Ware, Quabbin, Shawsheen, North Coastal, Ipswich, Merrimack, Parker, Cape Cod and Islands basins. A large part of the Metro Boston area and Buzzards Bay basin are also complete. Production of additional wetlands data is underway in the southeastern part of the state.