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In the UK our mapping agency has released a huge amount of their datasets to the public and commercial use for free.
Data is in vector and raster formats that AutoCAD Civil 3D can read.
I have been having a play with Panorama dataset which is height data in .asc format.
About 812 files for the whole of the UK and 130 million plus points.
So of course I have thrown them all into a point cloud for fun!
After a little wait I have one ISD file for the whole of the country.
Nice!
Jack Strongitharm