Castro, Maria Patrícia Pereira

da Silva, Eduardo Arouche

da Silva, Rennato Oliveira

de Oliveira, Kamilla Andrade

Oliveira, Ana Karla da Silva

Silva, Carlos Augusto Alves Cardoso

Sousa, Washington da Silva

English

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

Spectral response of temperature 
Biodiversidade Brasileira, 10(1): 81, 2020 Instituto Chico Mendes de Conservação da Biodiversidade 
 
 
81 
 
Spectral response of temperature and vegetation in regions with an 
incidence of hotspots in a river basin, case study 
 
 
Carlos Augusto Alves Cardoso Silva1*; Kamilla Andrade de Oliveira1; Rennato Oliveira da Silva1; 
Ana Karla da Silva Oliveira1; Eduardo Arouche da Silva1; Maria Patrícia Pereira Castro1; 
Washington da Silva Sousa1 
 
 
1 Universidade Federal do Maranhão (UFMA), Maranhão, Brasil 
*e-mail: carlosaugusto8435@gmail.com  
 
 
 
 
ABSTRACT – Fires significantly alter the vegetation cover, directly influencing the 
temperature of the soil surface, with vegetation being a natural regulator of the temperature 
of the environment. Thus, the objective was to evaluate in areas with higher incidence of 
hotspots the relationship between soil temperature and the Normalized Difference 
Vegetation Index (NDVI) of the Itapecuru River watershed, State of Maranhão. The study 
area is located in the centre-east of the state of Maranhão, between the coordinates 2° 51' 
to 6° 56' S and 43° 2' to 43° 58' W and an area of 52,972.1 km². The data used in relation 
to hotspots were obtained from the platform of the Burning Program - INPE, the NOAA-
12 and ATSR satellites. To calculate the NDVI and soil temperature, scenes from the 
Landsat satellite, TM/5 sensor were used, with band 4 (near infrared) and band 3 (red) for 
the NDVI results and band 6 for the calculation of the soil surface temperature. During the 
period from August 1, 2000 to October 31, 2000, 794 hotspots were detected in the basin 
area, being distributed: 336, 314, 154, 76 and 32 hotspots in areas of 25,488.804 km², 
22,622.331 km², 2,162.415 km², 2,236.902 km² and 461.648 km², respectively. The NDVI 
of the total area was calculated and ranged from 0.976 (high vegetation index) to -0.896 
(low vegetation index). In 39.28% of the total area, the highest vegetation indices were 
registered, with values between 0.976 and 0.47. While in 0.4058%, the lowest indexes were 
found, between -0.184 and -0,896. In relation to temperature, values ranging from 10ºC to 
15ºC were found for lower temperatures and 26ºC to 39ºC for higher temperatures, 
corresponding to 0.8462% and 38.631%, respectively, of the total area, highlighting 
temperatures between 22.2 and 26.3ºC in 53.25% of the basin area. A high visual similarity 
between temperature and NDVI was observed, i.e., in areas with lower vegetative index (-
0.184 to -0.896) the highest temperatures (26.4 °C to 39 °C) were observed. It was found 
that the temperature of the soil surface is directly related to the vegetation of the 
environment. 
 
Keywords: burning; deforestation; fire risk. 
 


Spectral response of temperature and vegetation in regions with an incidence of hotspots in a river basin, case study

https://www.icmbio.gov.br/revistaeletronica/index.php/BioBR/article/download/1569/1079

Spectral response of temperature and vegetation in regions with an incidence of hotspots in a river basin, case study

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