Análise temporal da vegetação na região do nordeste através de dados EVI do MODIS

Ciencia Florestal

Mileide de Holanda Formigoni¹ 

[1] UFSM

关键词: sensoriamento remoto;    índices de vegetação;    biomas;   

DOI  :  10.5902/198050982740

学科分类：农业科学（综合）

来源: Universidade Federal de Santa Maria * Centro de Pesquisas Florestais

【 摘 要 】

The Brazilian Northeast (NEB) region presents different vegetation types that are important to maintain this ecosystem. With remote sensing techniques it is possible to analyze variations in vegetation community and alterations in vegetation phenology. The main objective of this work is to evaluate the temporal behavior of the Enhanced Vegetation Index (EVI) from Moderate Resolution Imaging Spectroradiometer (MODIS) of different vegetation types in the NEB over the period ranging from February/2000 to July/2006. The study area was a transect of 1,550,000 km² (IBGE, 2004) at latitude -6º41’24” enclosed at the NEB region. A map of Brazil (1:5,000,000 scale, from Brazilian Institute of Geography and Statistics, IBGE) was used to characterize the vegetation types. A total of 144 cloud-free EVI images with spatial resolution of 250 m were acquired from National Aeronautics and Space Administration (NASA). The results showed that: i) EVI data were sensible to the vegetation types; ii) amazon vegetation presented lesser variation in the multi-temporal EVI, however with greater values; iii) Caatinga vegetation presented greater EVI values variation.

【 授权许可】

CC BY-NC