Since 1991, the computerized Census Sections (SC) have been the tool that responds to the need of Municipalities to prepare their own topographical plans for carrying out general censuses. The census section is the minimum survey unit, starting from which the higher-level territorial and administrative units (localities, sub-municipal areas, electoral districts plus possibly others) can be reconstructed by sum. The main characteristics of the census sections are shown below: each census section consists of a single body delimited by a closed broken line, normally formed by the lines that run along the center line of the linear geographic entities that identify the its perimeter; each census section must be completely contained within one and only one locality; the census sections must cover the entire municipal territory; the design of the sections must respect the sub-municipal subdivisions, where present; each census section was coded with a unique numerical code within each municipality.
