Evaluation of MODIS-LAI products in the tropical dry secondary forest of Mata Seca, Minas Gerais, Brazil | Posted on:2014-10-11 | Degree:M.Sc | Type:Thesis | University:University of Alberta (Canada) | Candidate:Yamarte Loreto, Payri Alejandra | Full Text:PDF | GTID:2453390005494920 | Subject:Agriculture | Abstract/Summary: | | Leaf Area Index (LAI) advances scientific knowledge of the role of secondary forests in forest area conservation. MODIS-LAI products provide an alternative, efficient and cost-effective method for measuring LAI in Tropical Dry Forests (TDFs). The performance of MODIS-LAI satellite products in a TDF was studied as a function of successional stages by (1) estimating seasonal LAI variations compared to in situ LAI values (2) using dry season MODIS-LAI products to estimate Woody Area Index (WAI) (3) estimating phenology changes through comparisons to in situ data. The study demonstrates (1) MODIS-LAI product showed agreement with in situ values with increasing successional stage. (2) MODIS-LAI product showed best agreement to in situ WAI values in the intermediate successional stage. (3) TIMESAT analysis indicated that MODIS-LAI products detected start-of-season 1-2 weeks before in situ values and end-of-season 20-30 days after in situ values, indicating that MODIS-LAI product captures canopy leafing, but is not suitable for detecting senescence.;Keywords: Leaf Area Index, Validation, MODIS, Woody Area Index, Phenology, Tropical Secondary Forest Succession, Hemispherical Photography, LAI-2000,. | Keywords/Search Tags: | MODIS-LAI products, Secondary, Area index, Forest, Tropical, Dry | | Related items |
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