(Link to Metadata) The ElevationDEM_LKCHDEM data layer includes bathymetric data derived NOAA nautical charts. All points were digitized from the RF 40,000 scale NOAA charts for Lake Champlain. The original data released in 1992 did not include information from Mallets Bay north and from the Crown Point bridge south. VCGI added data for these missing areas in 2003 by taking points from the LCBP data bundle (LAKEBATH). VCGI also replaced the shoreline points in 2010 using the shoreline as defined in the VHDCARTO dataset.