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MODELING SPATIAL TREE PATTERNS IN THE TAPAJóS FOREST USING INTERFEROMETRIC HEIGHT.pdf

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MODELING SPATIAL TREE PATTERNS IN THE TAPAJóS FOREST USING INTERFEROMETRIC HEIGHT

Revista Brasileira de Cartografia No 57/01, 2005. (ISSN 1808-0936) 1 MODELING SPATIAL TREE PATTERNS IN THE TAPAJóS FOREST USING INTERFEROMETRIC HEIGHT Till Neeff1,2 Gregory S. Biging3 Luciano V. Dutra1 Corina C. Freitas1 Jo?o R. dos Santos1 1Instituto Nacional de Pesquisas Espaciais - INPE Earth Observation Area - OBT Av. dos Astronautas, 1758; 12.227-010 S?o José dos Campos (SP); Brazil {dutra, corina}@dpi.inpe.br, jroberto@ltid.inpe.br 2University of Freiburg Biometry Department Tennenbacher Stra?e 4; 79085 Freiburg Brsg.; Germany tillneeff@fulbrightweb.org 3University of California at Berkeley Center for Assessment and Monitoring of Forest and Environmental Resources - CAMFER 227 Mulford Hall; Berkeley, CA 94720; USA biging@nature.berkeley.edu ABSTRACT The spatial distribution of very large trees in primary Amazon forest is extracted from a digital model of interferometric forest height by an approach of local maximum filtering. The spatial point patterns of very large trees are modeled by a series of Markov point process models. Spatial distribution is regular, and interaction decreases with distance; very large trees are shown to exert repulsive interaction with their neighboring very large trees. Keywords: InSAR, K-function, Local maximum filtering, Markov process, primary forest, spatial point pattern. RESUMO A distribui??o espacial de árvores muitas altas em florestas primárias na Amaz?nia é extraída de um modelo digital interferométrico da altura do dossel florestal, através de uma filtragem de máximas locais. Os padr?es pontuais espaciais de árvores muito altas s?o modelados por uma série de modelos de processos pontuais de Markov. As distribui??es espaciais s?o regulares, e as intera??es decrescem com a distancia; é mostrado que árvores muito altas exercem intera??es repulsivas com árvores vizinhas muito altas. Palavras chave: InSAR, fun??o K, filtragem de máximas loc