The contours were created by first digitising the 1903 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).
