%0 Conference Proceedings
%4 sid.inpe.br/marte2/2017/10.27.12.31.19
%2 sid.inpe.br/marte2/2017/10.27.12.31.20
%@isbn 978-85-17-00088-1
%F 59771
%T Relationships among slope, canopy height and vegetation greenness over coastal wet tropical forests in Australia and Brazil
%D 2017
%A Pinagé, Ekena Rangel,
%A Xie, Zunyi,
%A Scaranello, Marcos Augusto,
%A Ma, Xuanlong,
%A Longo, Marcos,
%A Santos, Maiza Nara dos,
%A Huete, Alfredo,
%@electronicmailaddress ekena.rangelpinage@student.uts.edu.au
%E Gherardi, Douglas Francisco Marcolino,
%E Aragão, Luiz Eduardo Oliveira e Cruz de,
%B Simpósio Brasileiro de Sensoriamento Remoto, 18 (SBSR)
%C Santos
%8 28-31 maio 2017
%I Instituto Nacional de Pesquisas Espaciais (INPE)
%J São José dos Campos
%P 1979-1986
%S Anais
%1 Instituto Nacional de Pesquisas Espaciais (INPE)
%X The factors that determine the occurrence, composition and structure of tropical forests and their functional responses to climate change are still not well understood. Remote sensing provides valuable tools for investigating these factors at multiple temporal and spatial scales. This paper aims to 1) explore the influence of topography on canopy height over complex terrain coastal tropical forest sites in Australia and Brazil; and 2) examine the relationship between vegetation greenness and canopy height at these forests. We used canopy height and terrain slope data derived from airborne lidar observations and Enhanced Vegetation Index (EVI) and Normalized Difference Vegetation Index (NDVI) from Landsat 8 imagery. Our results revealed different relationships between canopy heights and local topography. Over the Brazilian site, canopy height was significantly lower over flat slopes (0-10⁰), intermediate for gentle slopes (10-30⁰) and higher for steep slopes (>30⁰). Such relationship, however, was not observed over the Australian tropical forest site. Meanwhile, the Brazilian site showed significant differences in canopy greenness associated to different slope ranges, while the Australian site showed significant differences only for NDVI in two slope comparisons. We found no strong correlations between vegetation greenness and canopy height. Our results indicated site-specific relationships amongst canopy height, topography and VIs values, which might be attributed to distinct disturbance regimes and local environmental conditions, as well as bidirectional reflectance distribution function (BRDF) effects. Our findings thus highlight the influence of local context on the sensitivity of vegetation greenness to canopy structural properties.
%9 Floresta e outros tipos de vegetação
%@language en
%3 59771.pdf