Quantificação da invasão e mapeamento de Acacia dealbata Link. por detecção remota
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2019-10-16
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Os impactos ecológicos, econômicos causados em Portugal pelas espécies invasoras são extremamente danosos aos ecossistemas terrestres. A espécie A. dealbata é considerada como provavelmente a planta mais agressiva em sistemas terrestres, sendo indicada como invasora pelo decreto-lei nº 92/2019. A pesquisa teve como objetivo detectar se houve redução, manutenção ou ganho de área ocupada por A. dealbta, a partir do estudo das características da cobertura do solo e à análise da dinâmica da ocupação florestal em Portugal Continental entre 1990 e 2018. A metodologia utilizada se baseou nas várias cartas de uso e ocupação do solo existente para Portugal Continental, nomeadamente: CLC1990, CLC2018 (CLC- Corine Land Cover http://www.dgterritorio.pt/dados_abertos/clc/) e COS1995, COS2015(COS - Carta de Ocupação do Solo http://www.dgterritorio.pt/dados_abertos/cos/). Os resultados evidenciam que a espécie A dealbata em expansão e a constituir manchas suficientemente grandes para terem dimensão para serem cartografadas. O processamento das imagens de satélite permitiu concluir que é possível identificar áreas ardidas e fazer a sua cartografia, permitiram também verificar que a identificação de manchas de Acacia dealbata é possível, embora ainda que a certeza de classificação seja elevada, a certeza de utilização é baixa uma vez que a espécie se confunde com pastagens e com mato rasteiro. No entanto, como existe cartografia de uso e ocupação do solo onde as manchas maiores estão referídas e os ortofotomapas disponíveis na internet (Google Earth, Bing Maps, etc.) permitem atualizar essa cartografia, pode-se usar essa cartografia como máscara e isolar apenas as manchas de Acacia dealbata, aumentando significativamente a certeza de utilização da classificação proveniente de imagens de satélite.
The ecological, economic impacts caused by invasive species in Portugal are extremely damaging to terrestrial ecosystems. The species A. dealbata is considered as probably the most aggressive plant in terrestrial systems, being indicated as invasive by decree-law nº 92/2019. The research aimed to detect whether there was a reduction, maintenance or gain in the area occupied by A. dealbta, based on the study of soil cover characteristics and the analysis of the dynamics of forest occupation in Mainland Portugal between 1990 and 2018. The methodology used was based on the various land use and occupation charts for mainland Portugal, namely: CLC1990, CLC2018 (CLC- Corine Land Cover http://www.dgterritorio.pt/dados_abertos/clc/) and COS1995, COS2015 (COS - and Occupation Letter http://www.dgterritorio.pt/dados_abertos/cos/). The results evidenced that the species A. dealbata is expanding and constituting spots large enough to be dimensioned to be mapped. The processing of satellite images allowed us to conclude that it is possible to identify burnt areas and make their cartography, also allowed to verify that the identification of Acacia dealbata stains is possible, although the certainty of classification is high, the certainty of use is low since the species is confused with pastures.However, as there is cartography of land use and occupation where the biggest spots are mentioned and the orthophotomaps available on the internet (Google Earth, Bing Maps, etc.) allow you to update this cartography, you can use this cartography as a mask and isolate only the spots of Acacia dealbata, significantly increasing the certainty of using the classification from satellite images.
The ecological, economic impacts caused by invasive species in Portugal are extremely damaging to terrestrial ecosystems. The species A. dealbata is considered as probably the most aggressive plant in terrestrial systems, being indicated as invasive by decree-law nº 92/2019. The research aimed to detect whether there was a reduction, maintenance or gain in the area occupied by A. dealbta, based on the study of soil cover characteristics and the analysis of the dynamics of forest occupation in Mainland Portugal between 1990 and 2018. The methodology used was based on the various land use and occupation charts for mainland Portugal, namely: CLC1990, CLC2018 (CLC- Corine Land Cover http://www.dgterritorio.pt/dados_abertos/clc/) and COS1995, COS2015 (COS - and Occupation Letter http://www.dgterritorio.pt/dados_abertos/cos/). The results evidenced that the species A. dealbata is expanding and constituting spots large enough to be dimensioned to be mapped. The processing of satellite images allowed us to conclude that it is possible to identify burnt areas and make their cartography, also allowed to verify that the identification of Acacia dealbata stains is possible, although the certainty of classification is high, the certainty of use is low since the species is confused with pastures.However, as there is cartography of land use and occupation where the biggest spots are mentioned and the orthophotomaps available on the internet (Google Earth, Bing Maps, etc.) allow you to update this cartography, you can use this cartography as a mask and isolate only the spots of Acacia dealbata, significantly increasing the certainty of using the classification from satellite images.
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Relatório de Pós-Doutoramento em Deteção Remota