LIDAR (LIght Distance And Ranging, also known as Airborne Laser Swath Mapping or ALSM) is a relatively new technology that employs an airborne scanning laser rangefinder to produce accurate topographic surveys of unparalleled detail. When combined with GIS, LIDAR data allows for detailed mapping of hydrology and analysis of elevation patters for planning and design. The digital output of LIDAR surveying is a Digital Terrain Model (DTM) or Digital Elevation Model (DEM).
- Some areas of the shoreline have been mapped using blue-green LIDAR, which is able to penetrate the water column and capture shall subsurface topography. This allows linkage of LIDAR topography to Bathymetry (usually based on sonar) to build continuous coastal DEMs.
- https://lidarportal.dnr.wa.gov/ - the new well funded WDNR portal will likely replace the UW lidar portal.
- https://pugetsoundlidar.ess.washington.edu/ - The UW portal was the home of Puget Sound LIDAR for many years.
- https://open.canada.ca/data/en/dataset/957782bf-847c-4644-a757-e383c0057995 in Canada LIDAR appears to be managed at the national government level through the CanElevation Series.