The data contained in these files contain hydrographic and topographic data collected by the CHARTS (Compact Hydrographic Airborne Rapid Total Survey) system along the Lake Erie coast of Pennsylvania and in Lake Michigan for the Manitou Islands, Grand Traverse Bay, and Little Traverse Bay. The Grand Traverse Bay and Little Traverse Bay data were processed at a later date than the Pennsylvania coast and Manitou Islands data. The U.S. Army Corps of Engineers collects and maintains LiDAR data including orthophotos in coastal areas of the United States and its territories. The Corps acquires this data in the course of performing its mission of flood control, navigation, environmental engineering, and support for the Army and others. This is a bare earth data set. It was bare-earthed by the NOAA Office for Coastal Management. Lake Erie (PA shoreline) dates of collection: 17-20 Aug 2007 Lake Michigan (Manitou Islands) dates of collection: 11-20 Sept 2007 Lake Michigan (Grand Traverse Bay and Little Traverse Bay) dates of collection: 10-18 Sept 2007 Original contact information: Contact Org: JALBTCX Title: Data Production Manager Phone: 228-252-1111 Email: shoals-info@sam.usace.army.mil This data set is an LAZ (compressed LAS) format file containing LIDAR point cloud data.