Análise quantitativa de parâmetros biofísicos de bacia hidrográfica obtidos por sensoriamento remoto

Abstract

Resumo -O objetivo deste trabalho foi avaliar quantitativamente os parâmetros biofísicos obtidos por sensoriamento remoto, para a área de abrangência da Bacia Hidrográfica do Rio Tapacurá Quantitative analysis of biophysical parameters of watershed by remote sensingAbstract -The objective of this work was to quantitatively evaluate the biophysical parameters, obtained by remote sensing, for the range area of the Tapacurá River Basin, in Pernambuco state, Brazil. Landsat 5-TM images of 7/10/1989, 7/6/2005, and 8/29/2007 were used. The images were registered with a polynomial geometric correction of first order. Radiometric calibration, reflectance, transmittance and planetary albedo were calculated and, subsequently, thematic maps of surface albedo, surface temperature and enhanced vegetation index (EVI) were generated. The surface albedo showed increasing average values between the 1989 and 2005 images, which indicates the urban territorial expansion. The image of 8/29/2007 showed the highest land surface temperature, followed by the temperatures showed in the images of 7/10/1989 and 7/6/2005, and the highest values were those of the urban networks. The 1989 image showed the highest average value for EVI, which indicates that there was a higher vegetation presence in that date.

Influence of urbanization on land surface temperature in Recife city

“…by the transformation of the gray level of each pixel in spectral radiance L λi (ALLEN et al, 2007;SILVA et al, 2008;OLIVEIRA et al, 2012): (2) in which: a and b are the minimum and maximum spectral radiances (Wm -2 sr -1 μm -1 ) and ND is the pixel intensity (whole number between 0 and 255). Its calibration coefficients and spectral irradiance in atmosphere top are shown in Table 1.…”

Thermo-hygrometric modeling using ENVI-met® software to an urban park in Cuiabá – Brazil

“…Changes in land use and cover, either for agricultural use or urbanization, increase the albedo and surface temperature and reduce vegetation indices and the surface radiation balance (OLIVEIRA et al, 2012;NASCIMENTO et al, 2014).…”

Análise Multitemporal Da Temperatura Superficial Do Município De Carlinda - Mato Grosso

“…Entretanto, de acordo Oliveira et al (2012) mensurações em escala regional, por meio de instrumentos convencionais, podem levar a necessidade de elevados esforços, necessitando assim de formas mais ágeis e eficientes para obtenção desse tipo de informação. Para tanto, o uso do sensoriamento remoto configura-se uma importante ferramenta de análise, permitindo em curto espaço de tempo a obtenção de vastas redes de dados.…”