Papers by Maria do Carmo Nunes
SUMMARY Modern geospatial technologies applied to frontiers involve remote sensing data, namely s... more SUMMARY Modern geospatial technologies applied to frontiers involve remote sensing data, namely satellite imagery, orthophoto or orthoimages, global navigation technology (GPS/GNSS), as well as Geographical Information System (GIS) tools, which have been used during the last decade for boundary delimitation, demarcation or revision. This paper intends to present the case study of Guinea Bissau boundary which was the first African Portuguese colonies to settle its boundaries. It was delimitated by a Franco– Portuguese convention signed in Paris on May 12, 1886, and ratified later in Lisbon, on August 31, 1887. The demarcation was completed between 1900 and 1905 and recorded in memoranda prepared by the commissioners. For historical reasons Tropical Research Institute (IICT) concentrates a unique, vast and diverse amount of information concerning the borders of those countries. The scope of this research is to explore new methodologies and approaches to study frontiers, making use of ...
This case study focuses on borderlands located in Guinea Bissau, more specifically on the borderl... more This case study focuses on borderlands located in Guinea Bissau, more specifically on the borderland of Cape Roxo region, with a controversial geographic location which have been raising great interest and several disputes, mainly due to the lack of geographical information. This study intends to contribute to clarify the problem combining geographical information and multitemporal analysis to define the exact position of some boundary beacons.
Landscape Ecology, 2005
The purpose of this study is to investigate if, or under what conditions, fires select given land... more The purpose of this study is to investigate if, or under what conditions, fires select given land cover types for burning. If fires burn unselectively then the land cover composition (the proportional area of various land cover types) of individual fires should approximate the land cover composition available in their neighborhood. In this study we test this hypothesis by performing statistical analyses of a data set consisting of paired vectors with the proportions of land cover types present in burned areas and in their respective surroundings. The statistical methods employed (a permutation technique and the C max statistic) are commonly used in resource selection studies where data is subject to a unit-sum constraint. The results of the analysis of 506 fires that burned in Portugal in 1991 indicate that fires are selective, with small fires exhibiting stronger land cover preferences than large fires. According to the results of a multiple comparison analysis performed for small fires, there is a marked preference for shrubland followed by other forest cover types, while agriculture is clearly avoided. A similar analysis is performed to test if fire selectivity is related to the ecological region where it occurs. The results obtained in this study contribute to the discussion on the relative importance of fuels as a drivers of fire spread.
Atas das I Jornadas Lusófonas de Ciências e Tecnologias de Informação Geográfica
GOT - Geography and Spatial Planning Journal, 2014
This study aims to evaluate the road network's accessibility and to analyze land cover in borderl... more This study aims to evaluate the road network's accessibility and to analyze land cover in borderlands of Guinea Bissau, using techniques of remote sensing, Geographic Information Systems (GIS) and basic concepts of network analysis and was developed within the project "Geospatial Tools on Demarcation and Management of Guinea Bissau Boundary-GEOBOUND" 1. The analysis focuses on two regions where the boundary is, in part, demarcated by river valleys, one located in the northern sector with Senegal and another in the eastern sector with Guinea-Conakry. The results show that the road network and land cover have continuity between countries and also reveal a certain similarity, in each of the regions, in terms of cross-border accessibility, without the interference of the valleys.
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Papers by Maria do Carmo Nunes