What is study of Maps called as ?

Cartography

The answer is Cartography.

Cartography is the study and practice of making maps. It is a discipline that combines science, aesthetics, and technique to create a visual representation of Earth or a portion of Earth. Cartographers use a variety of methods to collect and analyze data, including surveying, remote sensing, and GIS. They then use this data to create maps that are accurate, useful, and aesthetically pleasing.

Carpolology is the study of fruits and seeds. Cryptology is the study of codes and ciphers. Mapology is not a real word.