The contours were created by first digitising the 1900 survey by Murray & Pullar. I'm fortunate to own a copy, but it can be viewed freely online
. Digitising, TIN interpolation, contour creation / smoothing were
all performed in QGIS
. 3D Spatial data is created by the Qgis2threejs plugin
. Lake outlines are from the UK Lakes Portal
, which contains OS data © Crown copyright and database right (2016).