@InProceedings{AraujoNelChaTavCel:2013:ExDiDe,
               author = "Araujo, Raquel Fernandes de and Nelson, Bruce Walker and Chambers, 
                         Jeffrey Quintin and Tavares, Julia Valentim and Celes, Carlos 
                         Henrique Souza",
                title = "Extens{\~a}o e distribui{\c{c}}{\~a}o de derrubadas por vento 
                         na Amaz{\^o}nia, associados a uma {\'u}nica linha de 
                         instabilidade em janeiro de 2005",
            booktitle = "Anais...",
                 year = "2013",
               editor = "Epiphanio, Jos{\'e} Carlos Neves and Galv{\~a}o, L{\^e}nio 
                         Soares",
                pages = "3352--3357",
         organization = "Simp{\'o}sio Brasileiro de Sensoriamento Remoto, 16. (SBSR)",
            publisher = "Instituto Nacional de Pesquisas Espaciais (INPE)",
              address = "S{\~a}o Jos{\'e} dos Campos",
             abstract = "A large number of blowdowns occurred in Amazonia in mid-January of 
                         2005 when a squall line traversed 4.5 million km2 of forest, 
                         propagating from SW to NE. This paper describes the spatial 
                         distribution of forest damage across Amazonia for that event, 
                         considering disturbance patches > ~3 ha in size. Damage was found 
                         to be highly concentrated near Manaus, not widespread. 
                         Nonetheless, blowdowns attributed to this single squall line 
                         contributed over half of all annual blowdown area detected in 30 
                         samples across Amazonia for that year. Leaving a single Landsat 
                         scene out of the sample would cause a large difference in the 
                         estimate of total damage. Methods: In Landsat images, blowdowns 
                         associated with the January 2005 squall line exhibit a distinct 
                         geometry. They are either diffuse or have SW to NE directed 
                         lineaments. Thirty sample polygons were allocated across the 
                         Amazon region, each containing 15,000 km2 of continuous forest. 
                         These were visually inspected at 1:80,000 scale in Landsat TM RGB 
                         images (bands 5-4-3) from the 2005 dry season. All blowdown 
                         footprints <~1y old and >~3 ha were recognized by spectral pattern 
                         and geometry. After linear spectral unmixing with CLASLite, the 
                         disturbed pixels were identified within each blowdown by a 
                         threshold of the pure vegetation fraction (<85%) then summed 
                         within each 15,000 km2 sample. The percent of forest damaged and 
                         attributed to this single squall line was then interpolated 
                         between the 30 sample centroids.",
  conference-location = "Foz do Igua{\c{c}}u",
      conference-year = "13-18 abr. 2013",
                 isbn = "{978-85-17-00066-9 (Internet)} and {978-85-17-00065-2 (DVD)}",
                label = "775",
             language = "pt",
         organisation = "Instituto Nacional de Pesquisas Espaciais (INPE)",
                  ibi = "3ERPFQRTRW34M/3E7GFRR",
                  url = "http://urlib.net/ibi/3ERPFQRTRW34M/3E7GFRR",
           targetfile = "p0775.pdf",
                 type = "Floresta e Vegeta{\c{c}}{\~a}o",
        urlaccessdate = "10 maio 2024"
}