Who changed geography by creating maps showing the earth as a Sphere?

The ancient Greek philosopher and mathematician Ptolemy significantly changed geography by creating maps that depicted the Earth as a sphere in his work "Geographia." His maps, which incorporated a coordinate system, influenced cartography for centuries and shaped the understanding of the Earth's geography in both the Islamic world and medieval Europe. Ptolemy’s representations laid the groundwork for later explorers and mapmakers, further advancing geographical knowledge.