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The National Oceanic and Atmospheric Administration (NOAA). Great for coastal regions/cites. Includes lidar coverage in certain areas.
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http://www.coast.noaa.gov/dataviewer/#app=b1ed&bda3-selectedIndex=1
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U.S. Geological Survey (USGS). Their earth explorer has a wide variety of data sets including satellite imagery, satellite radar (SRTM), and pockets of lidar coverage.
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Open Topography. Open lidar data.
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Vancouver
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San Francisco available through USGS.
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Surrey, British Columbia
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Toronto
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Washington, D.C.
- Intermap. Used by Mapbox for their terrain modelling (5m resolution, commercial license).