This is a comprehensive treatment of the subject by Dick Tennant looking at the cartography of French, Portuguese and British cartographers.   Maps in the Peninsular War   

The BCMH and the Friends of the Lines of Torres Vedras (FLTV) hosted a one day Conference on the Lines at the Cavalry & Guards Club, 127 Piccadilly, Mayfair, London W1J 7PX on Saturday 21 October 2017. Conference Report Registration 9.30am Conference 10am to 5pm Speakers included:

The BCMH and the Friends of the Lines of Torres Vedras (FLTV) are hosting a one day Conference on the Lines at the Cavalry & Guards Club, 127 Piccadilly, Mayfair, London. Announcement at FLTV website Furrther details and booking to be announced shortly.