http://hdl.handle.net/11422/28182 2026-04-23T23:34:04Z 2026-04-23T23:34:04Z Silva, Diego Vicente Sperle da http://hdl.handle.net/11422/28861 2026-03-15T03:00:15Z 2025-09-29T00:00:00Z

Title: Mapeamento de áreas susceptíveis à degradação no semiárido brasileiro no contexto de BIG EO DATA Author(s)/Inventor(s): Silva, Diego Vicente Sperle da Advisor: Cruz, Carla Bernadete Madureira Abstract: Environmental degradation in semi-arid regions represents one of the greatest challenges to ecological and socioeconomic sustainability on a global scale. In Brazil, the political semiarid region encompasses a significant portion of the national territory and concentrates a considerable population that is vulnerable to climate variability, water scarcity, and the anthropic impact in the local ecosystems. This dissertation aims to contribute to the analysis of susceptibility to land degradation in the Brazilian semiarid by integrating climatic and spectral data within a Big Earth Observation Data framework. The specific objectives are: (i) to automate the integration of spectral and climatic variables in Google Earth Engine through the creation of replicable codes based on time series; (ii) to develop a spatial model capable of mapping susceptibility to degradation using NDVI, LST, and accumulated precipitation; and (iii) to analyze the regional degradation scenario by integrating orbital data with meteorological station records. The adopted methodology is structured around three main axes: temporal analysis of MODIS (LST and NDVI) and CHIRPS variables; weighted overlay modeling in a GIS environment; and integration with historical temperature and precipitation series from INMET (1993–2024). The results revealed heterogeneous spatial patterns of susceptibility, with emphasis on three critical nuclei: northern Bahia, Angicos-Seridó, and the backlands of Ceará— areas consistent with previously identified desertification hotspots in the literature. The analysis of climate trends showed that over half of the meteorological stations analyzed exhibit both increasing mean temperatures and decreasing precipitation in recent decades, indicating a trend toward aridification. The use of remote sensing tools under a time-first paradigm proved effective in identifying temporal patterns of degradation, while the developed spatial model contributes to the diagnosis and continuous monitoring of the study area. The approach adopted advances methodological frameworks for the use of Big EO Data in Geography and provides technical support for the development of public policies aimed at mitigating environmental degradation in semiarid regions of Brazil and beyond. Publisher: Universidade Federal do Rio de Janeiro Type: Tese

2025-09-29T00:00:00Z Vaz, Julia Silva de Queiroz Lourenço http://hdl.handle.net/11422/28860 2026-03-15T03:00:15Z 2025-09-19T00:00:00Z

Title: Megalópole do sudeste brasileiro em construção? Regiões metropolitanas de Rio de Janeiro e São Paulo sob uma perspectiva espaço temporal Author(s)/Inventor(s): Vaz, Julia Silva de Queiroz Lourenço Advisor: Cruz, Carla Bernadete Madureira Abstract: In the 20th century, with the accelerated process of urbanization, large metropolises and megalopolises emerged, transforming cities into true global centers of information, people, and capital flows. The concentration of populations, economic activities, and social interactions in cities brings sustainability challenges such as housing, infrastructure, basic services, food security, health, and the environment (New Urban Agenda, UN-Habitat). In Brazil, most essential services are located in metropolitan areas, where the main urban challenges and opportunities are concentrated. In this context, the present research aims to understand land cover changes in the Rio–São Paulo axis. The analysis includes the expansion of the urban footprint, population growth, and the variation of forest fragments between 1985 and 2018. Data from MapBiomas, Geographic Information Systems (GIS), and sources such as IBGE were used to measure the gravitational pull between Brazil’s two largest metropolitan regions: Rio de Janeiro and São Paulo. The results indicate similar rates of population growth; however, there was a 4.85% loss of forest area in the São Paulo Metropolitan Region (RMSP) and a 5.3% gain in the Rio de Janeiro Metropolitan Region (RMRJ). Furthermore, an inverse relationship was observed between urban expansion and forest cover, demonstrating that urban growth often occurs at the expense of green areas. The analysis of gravitational attraction between the regions, using the center of mass method, revealed that RMSP exerts a stronger pull over RMRJ. The centers of mass of the metropolitan regions followed a northeast–southwest trajectory, while the unified center of mass shifted throughout the study period (1990–2018), reflecting the influence of public policies and socioeconomic events. In more recent years (2015–2018), there was a growing attraction of the urban footprint toward RMSP. This research contributes to the understanding of the formation of this complex urban nebula in Brazil, highlighting the interdependence and mutual attraction between the country’s two largest metropolises. Publisher: Universidade Federal do Rio de Janeiro Type: Tese

2025-09-19T00:00:00Z Lima , Sofia Siqueira http://hdl.handle.net/11422/28833 2026-03-13T03:00:13Z 2025-07-24T00:00:00Z

Title: O tempo atmosférico e o cotidiano laboral de entregadores por aplicativo Author(s)/Inventor(s): Lima , Sofia Siqueira Advisor: Fernandes, Nelson Ferreira Abstract: The platformization of labor has been reshaping sociospatial dynamics, labor relations, and modes of circulation within cities. App-based delivery workers labor for long hours under an algorithmic management system of informalized work, in which the costs of labor are borne by the workers themselves. As a result, the daily experience of high temperatures and intense rainfall events becomes yet another factor of exposure that further increases the vulnerability of platform workers. This dissertation aims to analyze the relationship between app-based delivery workers and the urban climate in the city of Rio de Janeiro, with an emphasis on climate risks associated with exposure to temperature and precipitation. We examine climate dynamics using both quantitative data from meteorological stations and qualitative methods that center the subjective experience of these impacts. Our qualitative approach includes interviews and digital ethnography conducted through participation in instant messaging groups of app-based couriers, as well as the collection of mobility data from a food delivery worker in Rio de Janeiro. This diverse set of data enabled us to analyze the labor routines at multiple scales: from the everyday lived experience to the ways in which companies continuously adapt algorithmic management strategies to intensify value extraction. The findings indicate that the delivery workers' daily schedules are affected by weather conditions, resulting in changes to mobility flows, wait times, and individual strategies to cope with heat and rain. The shifting of labor-related costs onto the workers increases their vulnerability to climate exposure, compelling them to develop coping strategies both individually and collectively. Climate risk is not merely a consequence of the precariousness of platform labor—it is a structural element in the ongoing process of informalization and erosion of workers’ rights. Thus, the materialization of climate risks in the daily lives of these workers is intrinsically linked to the processes of vulnerability and precarization imposed by digital platforms. Publisher: Universidade Federal do Rio de Janeiro Type: Dissertação

2025-07-24T00:00:00Z Ferreira, Tatiana de Sá Freire http://hdl.handle.net/11422/28832 2026-03-13T03:00:13Z 2025-06-27T00:00:00Z

Title: O mapeamento participativo como processo de visibilidade: o caso do quilombo Fazenda Santa Justina/Santa Izabel em Mangaratiba (RJ) Author(s)/Inventor(s): Ferreira, Tatiana de Sá Freire Advisor: Menezes, Paulo Márcio Leal de Abstract: Participatory Mapping is a methodological tool that enhances the visibility of the spatialities and territorialities of a group or community, where the mapped subjects become the authors of their own maps. By recording social markers, maps create a geographic framework that serves as both a reflective and awareness-raising tool about the place and lived space, both among individuals and in communication with external agents. Since the late 20th century, participatory mapping has been employed in urban planning projects and rural diagnostics. Academic research on the topic, across various fields of social and environmental sciences, often describes socio-environmental conflicts affecting traditional communities or uses the tool to document historical heritage. However, there are few accounts of the group’s involvement in the mapping process itself. The primary aim of this research was to analyze the role of participatory mapping in the affirmation of the Quilombo Fazenda Santa Justina/Santa Izabel within its territory. This quilombo is situated in the Costa Verde region of Rio de Janeiro, encompassing the grounds of two former plantations that once belonged to the family of comendador Breves, the largest trafficker of enslaved Africans in the 19th century. In 2019, the land is owned by a real estate company that threatens to expel around 70 families of family farmers who have resided there for generations. Organized as a quilombo-descendant community certified by the Palmares Cultural Foundation in 2016, they were undergoing a land titling process with INCRA at the time of this research. The research was conducted through field visits and participatory workshops, which culminated in the creation of the participatory map of the quilombo. To provide a clear understanding of the quilombo locations across the state, a survey of certified communities was conducted, and thematic maps were produced to spatialize the quilombos in the state as of 2021. The research results range from a geographic framework of the spatial distribution of Rio de Janeiro's communities to the spatiality of Mangaratiba's quilombolas, offering visibility at the local level, connecting with various public agents, from the municipal to the global scale. It is anticipated that the products generated will serve as educational tools in future research, community empowerment initiatives, and educational activities within the territories Publisher: Universidade Federal do Rio de Janeiro Type: Tese

2025-06-27T00:00:00Z