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The 1-foot contours were produced in ESRI Shapefile and AutoCAD DWG formats, with the ESRI Shapefiles being produced in block/regional coverages and with the AutoCAD files being produced in tiled format (mirroring the same size and naming convention as the 3-inch ortho-imagery produced in 2011). The contours were referenced to the Ohio State Plane Coordinate System, Ohio South Zone and with units in US Survey Feet. The horizontal datum referenced is NAD83 (1995) and the vertical datum referenced is NAVD88. The AutoCAD file naming convention is as follows: bsxxxyyy (Ohio South Zone); Please note that xxx and yyy represent the easting and northing coordinates (respectively) in state plane feet. File size of each AutoCAD file varies. Ownership of the data products resides with Columbus, Franklin County and the state of Ohio. 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