How to enter such large state-owned surveying and mapping units as Land and Resources Bureau and Bureau of Surveying and Mapping?

If you don't have a background, unless you are a graduate of a famous school, and it happens that that unit needs your talents in this field now, you can only work as a contract worker and can't enter the formal establishment. In terms of welfare benefits, the difference between contract workers and regular workers in all parts of the country is basically half, so I can only wish you good luck!