I made a zoomable, draggable, 3D relief map of Stroud, using OS maps. (Right-click to pan, scroll-wheel to zoom, control-click to rotate.)

An Ordnance Survey map of the Five Valleys of Stroud, rendered in 3D with hills in high relief, viewed at an oblique angle

Sorry, reader: I didn’t make detailed notes about how I did it, and it was a while ago. The brief version, as I recall it, is:

It’s interesting to see what Stroud would look like with a sea level of 60 meters (not that any climate models suggest sea levels going that high):

The same Ordnance Survey map of the Five Valleys of Stroud as the previous one on this page, as if it were flooded with water to the 60m contour

I also made one for a local historian, showing the plan and height of now-demolished buildings in Badbrook (where the cinema complex currently stands):

A small section of the Badbrook area of Stroud, Victorian map, with 3D shapes of different heights projected onto it

And one for my parents when they were taking part in a community project to survey the historic landscape of Holmfirth (shows listed buildings, and trees)

A 3D relief map of Holmfirth, 3D boxes representing listed buildings, green cones representing trees