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The original data layer, ConveyanceSystem, was created in 2011 by Geographic Technologies Group (GTG), the GIS consultants for the City of Unalaska. The GIS layer was created from an AutoCAD file. GTG converted the AutoCAD file into GIS and georeferenced it using monumentation set in Alaska State Plane Zone 10. Since its creation in 2011, the data has been updated and maintained by the City of Unalaska. In 2015, the ConveyanceSystem layer was broken down by sub-types to fit the LGIM schema. |