Cartography is the study of map making and cartographers are map makers. This culminated in a cadre of archaeologists, scientists, cartographers and engineers scouring northern Egypt. The maps of Ptolemy strongly influenced the cartographers of the Middle Ages. Several famous early cartographers also made use of the word Australia on maps. Henry did possess geographical curiosity, and employed cartographers. He produced maps from his studies of the work of other cartographers. Cartographers and seamen tried to demonstrate its reality. A few cartographers prefer south-up maps. Earlier lunar cartographers had given the feature different names. This site was later wrongly identified as the present Descanso Bay by British cartographers. During the time of New Netherland's colonization, the Dutch were the pre-eminent cartographers in Europe. The Greenwich prime meridian became the international standard reference for cartographers in 1884. Katara' derives its name from the common spelling used for 'Qatar' by ancient cartographers. They were regarded as Europe's finest cartographers. It has been in use by some cartographers since about 1850.