What is the contribution of the earth to mankind? Urgent! ! ! ! !

Judging from the relationship between resources and human beings, the relationship between environment and human beings, the population on the earth is limited in number: population = the area suitable for human habitation/the site needed by individuals for production and life. Expressed by the formula: X =S/s=aS. Where x is the population, s is the area suitable for human habitation, s is the site needed by each individual for production and life, and a= 1/s is a constant. The above formula X=aS can be called the law of population.

From the perspective of production and life, the space required for each individual's production and life is 1500 square meters. The upper limit of the earth's population can be calculated from the formula of population law X=aS, and the area suitable for human habitation and the site required for each individual's production and life on the earth are 1500 square meters.

Modern population census refers to the investigation and registration of the national population from house to house in accordance with unified items, unified forms and unified reporting methods within the unified time stipulated by the state. It is a large-scale social survey with strict organization and leadership, careful planning and scientific methods. The United States began to conduct a census from 1790, and was the first country to conduct a census.

There are 36 items in the United Nations census, including population migration, family, fertility rate, mortality rate, education, economy, housing and other characteristics. Some countries have more census items. For example, there are 65 items in US/KOOC-0/980, 69 items in Canada/KOOC-0/98/KOOC-0/,40 items in India/KOOC-0/98/KOOC-0/and 4 items in the Philippines/KOOC-0/.

Census information has legal effect. Its function can be summarized as the following three aspects: (1) formulating policies, allocating election places and drawing up construction plans. For example, the US Constitution stipulates that a census should be conducted every 10 years, so as to accurately allocate seats in the House of Representatives, and determine the number of state legislators and the federal government's funds for each state according to the population ratio. (2) It is used to study the regional distribution, fertility, death, growth, gender, age, urban and rural areas, occupation, culture and other characteristics of the population. (3) Decide on the supply of housing equipment, food, clothing, entertainment facilities, medicines, the layout of commercial outlets, the distribution of goods and labor, etc. Population size, distribution, age and gender information obtained through the census.

Census information is only a small part of the huge information family of digital earth. Digital Earth can integrate census information with other geospatial data. For example, population information is filed and managed by departments and administrative units, and it echoes the spatial characteristics of ground objects (such as ground object images) through the Internet. Through the digital earth, people can browse a series of electronic maps (such as topography, water system, land use, population distribution, etc. ) and the description of a country or region on the earth, to obtain detailed information about the population and its living space, including the total population, the ratio of male to female, education level, nationality, occupation, economy, education, commerce, health care, public welfare, employment, social insurance, etc. You can get detailed information, including photos, by visiting your home page.

Census information is widely used in population analysis and prediction. By interpreting high-resolution satellite images, scientists can obtain information about urban buildings and estimate the population of residential areas. The digital earth supported by satellite remote sensing, geographic information system and internet technology has strong analysis, evaluation and simulation capabilities. For example, scientists in pendleton, California, USA can simulate the effects of different population growth on biodiversity by collecting information such as topography, soil types, annual rainfall, vegetation, land use and land ownership. For another example, through the census data, we can simulate the dynamic growth, population distribution and migration of urban population. The immigration problem in large-scale projects such as the Three Gorges Project can be solved with the help of the network function, interoperability and geographic information system technology of the digital earth.