Mercator projection (isometric cylindrical projection) is often used for topographic maps less than 500 thousand at sea. Lambert projection and Albers projection (isometric tangent cone projection) belonging to the same projection system are also used in most provincial maps and most maps of this scale in China.
Distribution of Climate Types in China
1, tropical monsoon climate.
Including southern Taiwan Province Province, Leizhou Peninsula and Hainan Island. Annual accumulated temperature >; =8000℃, the average temperature in Leng Yue is not lower than 16℃, the annual extreme minimum temperature is not lower than 5℃ on average for many years, and the extreme minimum temperature is generally not lower than 0℃, and there is no frost all year round.
2. Subtropical monsoon climate.
North China and South China belong to this type of climate. The annual accumulated temperature is between 4500-8000℃, and the average temperature in Leng Yue is -8-0℃, which is a transitional zone between subtropical zone and temperate zone, and the summer temperature is quite high (average temperature >; =25℃ for at least 6 days, that is, 30 days), and the temperature is quite low in winter.
3. Temperate monsoon climate.
Inner Mongolia and northern Xinjiang in China belong to this type of climate. The annual accumulated temperature is lower than 1600-3400℃, the average temperature in Leng Yue is -28-8℃, and the average temperature in summer is still above 22℃, but rarely exceeds 25℃.
4. Temperate continental climate.
The generalized temperate continental climate includes temperate desert climate, temperate grassland climate and sub-frigid coniferous forest climate. Include temperate desert climate and temperate grassland climate.