297mm*420mm. According to the specifications of the landscape map, the frame size of a3 is 297mm * 420mm, the frame size of binding edge is 25mm, the opposite side is 10mm, and the top and bottom are 10mm. Landscape Cartography is a textbook of the national "Twelfth Five-Year" vocational education planning, edited by Wu Liwei and Lu Dan, and published by Higher Education Press, 20 15. This textbook is not only suitable for landscaping and landscape technology majors in secondary vocational schools, but also can be used as a training textbook for the landscape industry and a self-study book for on-the-job employees.