da Silva, Francisco Alves

Pinto, Luís Antônio de Araújo

English

Portal de Revistas do ICMBio (Instituto Chico Mendes de Conservação da Biodiversidade)

Temporal analysis of vegetation 
Biodiversidade Brasileira, 10(1): 78, 2020 Instituto Chico Mendes de Conservação da Biodiversidade 
 
 
78 
 
Temporal analysis of vegetation cover variation by fire action in 
Lábrea (AM) 
 
 
Luís Antônio de Araújo Pinto1*, Francisco Alves da Silva1 
 
 
1 Universidade do Estado do Amazonas (UEA), Mabaus, Brasil 
* e-mail: lpinto@uea.edu.br  
 
 
 
 
ABSTRACT – The present work aimed to analyze and quantify the areas of fire occurrence 
and the consequences of its action on vegetation, in the territory of Lábrea, southern region 
of the Amazonas state. Operational Land Imager (OLI) sensor scenes were used aboard the 
Landsat 8 satellite, from August and September of 2014 and 2015. These scenes were 
treated using remote sensing techniques, divided into two stages: (1) pre -processing 
(radiometric calibration, atmospheric correction, reflectance conversion and noise 
removal); (2) post-processing (vegetation index generation: Normalized Difference 
Vegetation Index - NDVI, Normalized Burn Index - NBR, image composition, 
interpretation, mapping, quantification and spectral behavior of vegetation). Heat source 
data from the Instituto Nacional de Pesquisas Espaciais (INPE) burn monitoring program 
were also used. The results demonstrated the high increase of hot spots in 2015, compared 
to 2014. The location with the highest concentration of hot spots was in the Assentamento 
Monte project. The use of NDVI and NBR vegetation indices showed the potential in the 
identification and mapping of burned areas. Comparison of hot spots with areas of effective 
burn demonstrated the inaccuracy of the location of the burn monitoring sensors. The total 
estimated burned areas in two different areas of the Lábrea municipality (AM) were 
1,174.37 ha and 12,761.26 ha in August and September 2014, respectively, and 22,403.86 
ha and 23,320.71 ha in August and September 2015, respectively. Through the spectral 
behavior of the vegetation it was noticed that the alteration of the surface reflectance after 
a burn, reflecting larger amount of energy in the red and blue bands. The results show that 
the largest amount of heat spots and burnt areas are in settlement project areas, and that the 
NBR vegetation index has the greatest potential to distinguish burnt areas from other 
vegetation types. The spectral response of the surface changes with burning events in which 
the red band showed higher sensitivity. 
 
Keywords: remote sensing, vegetation index, burning, spotlights heat 
 


Temporal analysis of vegetation cover variation by fire action in Lábrea (AM)

https://www.icmbio.gov.br/revistaeletronica/index.php/BioBR/article/download/1565/1076

Temporal analysis of vegetation cover variation by fire action in Lábrea (AM)

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