Map formulae

The notes from the 1970s and 80s were originally intended for studying long-distance leys and landscape geometry on British Ordnance Survey maps.

• Simplified formulae for Ordnance Survey maps (1977)
• Maximum discrepancy between straight line and geodesic on OS maps (1985)
• Adjusting National Grid coordinates for ley-hunting (1986)
• Conversion between map (grid) coordinates and image coordinates
• Alternative formulae for the Transverse Mercator projection
• Length of meridian arc on an ellipsoid
• Converting isometric latitude to geographic latitude