Product: These lidar data are processed Classified LAS 1.4 files, formatted to 247 individual 1000 m x 1000 m tiles; used to create intensity images, land/water interface breaklines and topobathymetric DEMs as necessary. Geographic Extent: Potomac River and margins in Maryland, West Virginia, and Virginia, covering approximately 39.2 square miles. Dataset Description: The Maryland Potomac River Topobathymetric Lidar project called for the planning, acquisition, processing and derivative products of lidar data to be collected at a nominal pulse spacing (NPS) of 0.7 meter. Project specifications are based on the U.S. Geological Survey National Geospatial Program Base Lidar Specification, version 1.3. The data was developed based on a horizontal projection/datum of NAD83 (2011), Universal Transverse Mercator zone 18, meters and vertical datum of NAVD88 (GEOID12B), meters. Lidar data was delivered as processed Classified LAS 1.4 files, formatted to 247 individual 1000 m x 1000 m tiles, as tiled Intensity Imagery, and as tiled topobathymetric DEMs; all tiled to the same 1000 m x 1000 m schema. A merged topobathymetric DEM was also delivered. Ground Conditions: Lidar was collected in October 2019, while no snow was on the ground and rivers were at or below normal levels. In order to post process the lidar data to meet task order specifications and meet ASPRS vertical accuracy guidelines, Dewberry established a total of 39 checkpoints that were used to calibrate the lidar to known ground locations established the project area and assess the vertical accuracy of the data. This data set is an LAZ (compressed LAS) format file containing LIDAR point cloud data.