Adams hemisphere-in-a-square projection

{{Short description|Conformal map projection}}

{{one source |date=May 2024}}

File:Adams hemisphere in a square.JPG

File:Adams Doubly-Periodic with Tissot's Indicatrices of Distortion.svg

The Adams hemisphere-in-a-square is a conformal map projection for a hemisphere. It is a transverse version of the Peirce quincuncial projection, and is named after American cartographer Oscar S. Adams, who published it in 1925.{{citation|title=Cartographic Science: A Compendium of Map Projections, with Derivations|first=Donald|last=Fenna|publisher=CRC Press|year=2006|isbn=9780849381690|url=https://books.google.com/books?id=8LZeu8RxOIsC&pg=PA357|page=357}}. When it is used to represent the entire sphere it is known as the Adams doubly periodic projection. Like many conformal projections, conformality fails at certain points, in this case at the four corners.