I took a look at this after it was mentioned on Hacker News two weeks ago and ended up building this map of all the DSM 1m data:<p><a href="https:&#x2F;&#x2F;houseprices.io&#x2F;lab&#x2F;lidar&#x2F;map" rel="nofollow">https:&#x2F;&#x2F;houseprices.io&#x2F;lab&#x2F;lidar&#x2F;map</a><p>I&#x27;ve been quite fascinated to discover how many mysterious lumps and bumps are to be found all over the country, often with no apparent explanation in aerial photo maps, and to my great surprise I find myself cultivating an interest in armchair archaeology. I&#x27;ve stumbled across a few features which on further research have turned out to be sites of note, a couple of which were only discovered in recent years, which is quite exciting. Next mission is to discover something completely unknown. In fact I could do with some help interpreting some features if anyone here has any experience in this area.<p>Here&#x27;s a couple of well known sites:<p><a href="https:&#x2F;&#x2F;houseprices.io&#x2F;lab&#x2F;lidar&#x2F;map?ref=SU1224642189" rel="nofollow">https:&#x2F;&#x2F;houseprices.io&#x2F;lab&#x2F;lidar&#x2F;map?ref=SU1224642189</a> (Stonehenge)<p><a href="https:&#x2F;&#x2F;houseprices.io&#x2F;lab&#x2F;lidar&#x2F;map?ref=SU1025569962" rel="nofollow">https:&#x2F;&#x2F;houseprices.io&#x2F;lab&#x2F;lidar&#x2F;map?ref=SU1025569962</a> (Avebury)<p>A few of my &#x27;discoveries&#x27;:<p><a href="https:&#x2F;&#x2F;houseprices.io&#x2F;lab&#x2F;lidar&#x2F;map?ref=ST5895844810" rel="nofollow">https:&#x2F;&#x2F;houseprices.io&#x2F;lab&#x2F;lidar&#x2F;map?ref=ST5895844810</a> (Medieval and Iron Age&#x2F;Roman field systems near Croscombe, Somerset)<p><a href="https:&#x2F;&#x2F;houseprices.io&#x2F;lab&#x2F;lidar&#x2F;map?ref=NY7217242430" rel="nofollow">https:&#x2F;&#x2F;houseprices.io&#x2F;lab&#x2F;lidar&#x2F;map?ref=NY7217242430</a> (Potential henge near Alston, Cumbria)<p><a href="https:&#x2F;&#x2F;houseprices.io&#x2F;lab&#x2F;lidar&#x2F;map?ref=SX1025261066" rel="nofollow">https:&#x2F;&#x2F;houseprices.io&#x2F;lab&#x2F;lidar&#x2F;map?ref=SX1025261066</a> (Roman Fort near Restormel Castle, Cornwall)<p>A couple of things I&#x27;m not sure about:<p><a href="https:&#x2F;&#x2F;houseprices.io&#x2F;lab&#x2F;lidar&#x2F;map?ref=ST4580543091" rel="nofollow">https:&#x2F;&#x2F;houseprices.io&#x2F;lab&#x2F;lidar&#x2F;map?ref=ST4580543091</a><p><a href="https:&#x2F;&#x2F;houseprices.io&#x2F;lab&#x2F;lidar&#x2F;map?ref=TL2327777126" rel="nofollow">https:&#x2F;&#x2F;houseprices.io&#x2F;lab&#x2F;lidar&#x2F;map?ref=TL2327777126</a>