Provenance

Image credits

Each picture carries a badge saying what kind of image it is. So far there are 33 historical images, 0 adapted and 2 schematic models. Licenses were checked on the holding institution's own page, linked from each entry.

Historical
A real historical image, unaltered apart from cropping and resizing.
Adapted
A historical image we edited. The entry says what we changed.
Schematic model
Drawn in code from cited measurements, such as the 3D ears.

All images

The base map

Coastlines, borders and rivers are from Natural Earth, which is in the public domain. The engraved look (water lines, hatching, paper and washes) is drawn by the site's own code and is not a historical map.