Cartography is the making and studying of maps. Maps are generally a way to visualise spatial information, but can also include other types of information, such as time, flora, fauna, objects and events.

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Good online sources for historical maps

I am looking for good online sources for historical maps, specifically the late medieval period (but other periods would be interesting as well). While there are many historical maps out there, few ...
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1answer
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What are the historical reasons for the conventional map orientation?

North is traditionally shown upwards in maps, although there isn't any physical reason for it - compass needles point parallel to magnetic field lines. Showing south as up would be just as legitimate. ...
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Why is Baja California often shown as an island on maps between 1500 and 1700?

Several maps done in the 16th & 17th Centuries show a huge island off the western coast of America. At its lower end, it looks a lot like baja california, but it is clearly an island, as opposed ...