CANOPY HEIGHT MODELS TO MONITOR AREAS UNDER DEGRADATION IN MIXED OMBROPHILE

ABSTRACT This research was aimed at providing a study of digital elevation models from Airborne Laser Scanner (ALS) data. The goal was to improve the forest monitoring, or more specifically, arboreal canopy monitoring, which contains the most elevated vegetation of the forest. It is also described a...

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Veröffentlicht in:Revista árvore 2016-10, Vol.40 (5), p.959-964
Hauptverfasser: Alixandrini Junior, Mauro José, Valadares, Josmar Oliveira, Loch, Carlos
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Sprache:eng
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Zusammenfassung:ABSTRACT This research was aimed at providing a study of digital elevation models from Airborne Laser Scanner (ALS) data. The goal was to improve the forest monitoring, or more specifically, arboreal canopy monitoring, which contains the most elevated vegetation of the forest. It is also described as the surface above the canopy top. The region of rain forest between the states of São Paulo and Paraná in Brazil was analyzed. The proposed method employs the ALS system that provides information related to different vegetative cover bedding, to analyze it and reach to estimate for the most elevated stage. The methodology is based on differentiating the identified surfaces in the original set of data. It uses these surfaces with a raster, which was obtained from an interpolation of different sets of points from the surfaces of interest. The raster structure, unlike vector data, allows for processes linked to the digital processing of images. It enables implementation of digital filters over the data. The method helped in reducing the influence of errors during classification and achieving the theoretical surface. The results revealed a coherent relationship with anthropogenic influence such as the introduction of exotic vegetation. We concluded that arboreal vegetation could be an index of conservation for environmental registration and licensing organizations. RESUMO A investigação foi conduzida para a análise da aplicação de modelos de superfície derivados de levantamentos de varredura laser aerotransportada contribuiriam para o monitoramento de florestas. O foco foi mais especificamente a análise do estrato arbóreo, que contém a parte mais elevada da vegetação de um dado tipo florestal, também descrito como superfície acima da copa dossel. É analisada uma região de Floresta ombrófila mista entre os estados de São Paulo e Paraná no Brasil. A proposta é utilizar o sistema ALS- Airborne Laser Scanner, que fornece informações ligadas a diferentes estratos da cobertura vegetal, para analisar o comportamento e alcançar uma estimativa para a altura do estrado mais elevado. A metodologia elaborada baseia-se na diferenciação de superfícies identificadas no conjunto de dados originais e na utilização dessas superfícies com uma estrutura matricial "raster". Essa estrutura é obtida a partir da interpolação dos diferentes conjuntos de pontos das superfícies de interesse. A estrutura matricial, ao contrário da vetorial, permite o uso de processamento digital de imagens,
ISSN:0100-6762
1806-9088
0100-6762
DOI:10.1590/0100-67622016000500020