Presenting a great relevance to the urban environment, green areas comprise a point of balance between built and non-built environments. Society, which lives in areas considered urban, needs not only the basic infrastructure for its survival (such as sanitary, road, health and education infrastructures), i/t also lacks the connection with nature, free construction spaces and an ecologically balanced environment. The benefits of green areas in urban areas go beyond the ecological aspect; such as air filtration, dust and microorganisms retention, reducing noise, balance temperature, absorb part of the sun s rays, retain moisture in the soil, which avoids erosion, floods, providing regulation of the water cycle, shelter for fauna and exchange of gene flow between natural areas; they also act on the psychological well-being of the human being with biophilia, the need for man to pursue non-building areas. Non-building and green areas have the ability to explain the relationship between man and nature, that is, for the purposes of this study, the relationship among society, natural physical means, vegetation, rivers, seas and other elements. In order to support this scientific research, explanations about how the distribution of green areas happen in some cities, such as Rio de Janeiro (having the basis of research carried out by Data Rio - an entity owned by the City of Rio de Janeiro, in 2017) were analyzed ) and by developing and applying this methodology in a specific study having the city of Niterói in the metropolitan area of Rio de Janeiro, as a basis for the analysis of its quantitative and the assessment of green areas in the urban environment. Having the municipality of Rio de Janeiro as a first example, by assessing urban green areas in Brazilian municipalities - there was a huge difference in the volume and distribution of green areas by neighborhoods.