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The USGS liaisons are updating the United States Interagency Elevation Inventory (https://coast.noaa.gov/
This web service provides users with access to data including: topo LiDAR, shoreline data, bathymetric LiDAR, hydrographic surveys and much more – see the resource HERE
About the service:
The U.S. Interagency Elevation Inventory displays high-accuracy topographic and bathymetric data for the United States and its territories. The project is a collaborative effort of NOAA and the U.S. Geological Survey, with contributions from the Federal Emergency Management Agency, U.S. Department of Agriculture, and U.S. Army Corps of Engineers. This resource is a comprehensive, nationwide listing of known high-accuracy topographic data, including lidar and IfSAR, and bathymetric data, including NOAA hydrographic surveys, multibeam data, and bathymetric lidar.
The information provided for each elevation dataset includes many attributes such as vertical accuracy, point spacing, and date of collection. The last comprehensive update to the topographic portion of the inventory was completed in March 2015. However, many corrections and additions are made between comprehensive updates. Bathymetric data are current as of November 2012. These data are static snapshots of availability that will soon be replaced with a dynamic map service.