The use of space to understand event distribution in epidemiology is not recent. Since the dawn of classical epidemiology, with the studies of Jhon Snow, space has been strongly identified as one of the main variables for sanitary analysis of the magnitude and transcendence of public health problems. The territory in which individuals live and work constitutes the locus where the social determinants of health (SDH) interact, in order to influence the dynamics of health events.

Territory mapping is a routine activity of nursing practice in Primary Health Care (PHC). The benefits of using geoprocessing in PHC have been reported in different regions of the world, namely: possibility of updating and analyzing epidemiological data in the form of maps; broader and more agile understanding of the population’s health problems; optimization of health professionals’ work process; assessment of the integrity of local surveillance programs; and identification of existing inequities in the territory for a better resource distribution(1Rebolledo EAS, Chiaravalloti-Neto F, Giatti LL. Experiencias, beneficios y desafíos del uso de geoprocesamiento para el desarrollo de la atención primaria de salud. Rev Panam Salud Publica [Internet]. 2018 [cited 2022 Feb 15];42:e153. Available from: https://www.scielosp.org/pdf/rpsp/2018.v42/e153/es
https://www.scielosp.org/pdf/rpsp/2018.v... ).

The covid-19 pandemic, caused by the severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2), has made explicit the need to prepare health systems around the world to follow the dynamics of spatial and temporal patterns of disease in a timely manner. In this context, strengthening health surveillance practices, incorporating the use of Geographic Information Systems (GIS) into epidemiological methods, is an excellent strategy for planning health actions and services with a focus on mitigating and controlling the disease in the territory.

Broadly speaking, GIS encompasses a fundamental and universally applicable set of tools to capture, transform, manage, analyze and present georeferenced information(2Maurelli MP, Pepe P, Montresor A, Mupfasoni D, Nocerino M, Morgoglione ME, et al. Development of a public geographical information system-based website to follow the impact of control activities of soil-transmitted helminths in endemic countries. Geospat Health [Internet]. 2021 [cited 2022 Feb 15];16(2):1049. Available from: https://geospatialhealth.net/index.php/gh/article/view/1049/1033
https://geospatialhealth.net/index.php/g... ). While conventional maps allow the observation of a finite set of data, GIS presents flexible digital cartography, as it allows the simultaneous visualization of health and contextual data(3Bergquist R, Rinaldi L. Covid-19: pandemonium in our time. Geospat Health [Internet]. 2020 [cited 2022 Feb 15];15:880. Available from: https://geospatialhealth.net/index.php/gh/article/view/880/857
https://geospatialhealth.net/index.php/g... ).

In view of this, investigations of an ecological nature have been important allies of scientific community and managers to assess the pandemic process. Although they do not allow the establishment of causality, these studies provide an accurate picture of the health situation, by pointing out high-risk spatial clusters, as well as raising hypotheses for the development of new research. In this way, the implementation of geoprocessing in studies of population aggregates can provide robust results on the covid-19 dynamics, magnitude and transcendence in Brazil and in the world.

Ecological studies conducted in northeastern Brazil showed important results on the spread(4Gomes DS, Andrade LA, Ribeiro CJN, Peixoto MVS, Lima SVMA, Duque AM, et al. Risk clusters of COVID-19 transmission in northeastern Brazil: prospective space-time modelling. Epidemiol Infect [Internet]. 2020 [cited 2022 Feb 15];148:e188. Available from: https://www.cambridge.org/core/journals/epidemiology-and-infection/article/risk-clusters-of-covid19-transmission-in-northeastern-brazil-prospective-spacetime-modelling/E87C8EDF8DF13485272A23F83145A0EA
https://www.cambridge.org/core/journals/... ) and mortality of covid-19(5Andrade LA, Paz WS, Lima AGCF, Araújo DC, Duque AM, Peixoto MVS, et al. Spatiotemporal pattern of covid-19-related mortality during the first year of the pandemic in Brazil: a population-based study in a region of high social vulnerability. Am J Trop Med Hyg [Internet]. 2022 [cited 2022 Feb 15];106(1):132-42. Available from: https://www.ajtmh.org/view/journals/tpmd/106/1/article-p132.xml
https://www.ajtmh.org/view/journals/tpmd... ) through spatial, temporal and spatial-temporal analysis techniques. The integration of these approaches makes it possible to analyze the pandemic process in a prospective and retrospective way, as well as measure the speed of spread and mortality of the disease, according to its growth trend.

Thus, we emphasize that, through the spatial regression technique, it is possible to propose explanatory models of the disease occurrence in space, considering contextual factors that make some populations more vulnerable to illness. Thus, we emphasize that these analysis tools allow high-impact associations between diseases and SDH, an essential aspect in scenarios of social inequities.

Given the relevance and applicability of this method, we believe that the use of geoprocessing in scientific investigations can be part of health education from the most elementary level (undergraduate degree), providing subsidies for these professionals to have expertise to strengthen epidemiological surveillance practices in health services. Thus, it is urgent to promote an agile and timely health system in the identification and resolution of health problems, considering the particularities of each population.

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