Birdoswald lidar

The Roman fort at Birdoswald on Hadrian's Wall sitting high above the steep-sided (and eroding) valley of the River Irthing. The wall itself attaches to the northern corners of the fort running eastwards to a mile-castle just before the steep descent to the river. The Vallum appears at the west of the plot with (intriguing) earthworks just to the north. Sky-view factor plot using EA 1m-centred data.

Maryport lidar

Lidar from the usual source (EA). Slope severity plot looking NE, showing the setting of the Roman fort at Maryport very well.

Here, looking in much the same direction, a sky-view-factor plot showing the impressive detail of the surviving earthworks. Excavations have been ongoing for a year or two. Plenty there to go at.

Caerwent

The smaller scale image doesn't really do this justice. This is extracted from Environment Agency 0.25m centred lidar survey data. Not much UK coverage at this scale, mostly very tightly focused on coastal zones and river valleys, but they do happen to have covered the site of Venta Silurum. The detail of the wall circuit and bastions, and of exposed Roman building foundations within the town, is quite amazing (for what is, essentially, an off-the-shelf product).

Here, the same expressed as a sky-view factor plot and viewed as a 3D model from the south-west.

Old Sarum

The Iron Age hillfort and later motte (and cathedral) at Old Sarum, just north of Salisbury, Wiltshire. Environment Agency 0.5m-centred data (this stuff is starting to get impressively detailed) expressed as a sky view factor map with colour ramp.

And the sky-view-factor plot viewed from the NW as a 3D model.