In the real world, Urbano Monte’s 1587 map of the world exists as a series of 60 manuscript sheets designed to be assembled into a large world map—one that would be, at 10 feet square, the largest early world map known to exist.1 As the David Rumsey Map Collection explains, “the whole map was to be stuck on a wooden panel 5 and a half brachia square (about ten feet) so that it could be revolved around a central pivot or pin through the north pole.”
But with only two copies known to exist, that ain’t happening. So what the Rumsey Collection has done, with the copy they recently acquired via Barry Ruderman, is to do it virtually, creating a digital edition of the map as a single image (see above). The digital Monte map was apparently revealed at the Ruderman Conference last October (previously).
The Rumsey Collection’s blog post has lots of images of the individual sheets, and explains how digitizing the map explains Monte’s choice of projection:
Monte wanted to show the entire earth as close as possible to a three-dimensional sphere using a two-dimensional surface. His projection does just that, notwithstanding the distortions around the south pole. Those same distortions exist in the Mercator’s world map, and by their outsized prominence on Monte’s map they gave him a vast area to indulge in all the speculations about Antarctica that proliferated in geographical descriptions in the 16th century. While Mercator’s projection became standard in years to come due to its ability to accurately measure distance and bearing, Monte’s polar projection gave a better view of the relationships of the continents and oceans.
The Mercator version of Monte’s map is here. A Google Earth KMZ file of the map as a digital globe is here. For background on Monte’s map, see the accompanying essay by Katherine Parker, “A Mind at Work” (PDF). For more coverage, see All Over the Map’s blog post.