I've found an interesting resource for those interested in creating this map: "Medieval Woodcut Illustrations"
http://www.amazon.com/exec/obidos/tg/detail/-/0486404587/qid=1102567147/sr=8-1/ref=sr_8_xs_ap_i1_xgl14/103-1577093-5819843?v=glance&s=books&n=507846
It's clearly one of the inspirations the artists drew from in creating the map cover illo. Click through the "Look Through This Book" to see what I mean: very similar treatments of wall shading, doorways, etc. I have the book and some of the other city drawings are even more dead on.
http://www.amazon.com/exec/obidos/tg/detail/-/0486404587/qid=1102567147/sr=8-1/ref=sr_8_xs_ap_i1_xgl14/103-1577093-5819843?v=glance&s=books&n=507846
It's clearly one of the inspirations the artists drew from in creating the map cover illo. Click through the "Look Through This Book" to see what I mean: very similar treatments of wall shading, doorways, etc. I have the book and some of the other city drawings are even more dead on.