The Swedish explorer Sven Hedin conducted 1893–1897, 1905-1909 and 1927-35 three expeditions which mapped big parts of Tibet. Hedin had a doctorate in geography and was a skilled cartoonist and writer who together with other participants in these expeditions carefully documented what they saw in Tibet from many different aspects during these expeditions. Hedin and his followers made surprisingly accurate and detailed maps of large parts of Tibet compiled extensive documentation of their observations. Hedins books and lectures about his expeditions made him a world-famous person in the years before the First World War.