Mapeamento da temperatura da superfície terrestre com uso do sensor AVHRR/NOAA

Abstract

Resumo -O objetivo deste trabalho foi avaliar a adequação do uso do sensor AVHRR/NOAA (Advanced Very High Resolution Radiometer/National Oceanic and Atmospheric Administration) para mapeamento da temperatura da superfície terrestre (TST) Termos para indexação: sensoriamento remoto, janela dividida, temperatura do ar, infravermelho, termal. were compared for the minimum LST estimation, using nocturnal and predawn images. Both emissivity and LST data were obtained by means of mathematical combinations of the visible, near-infrared and thermal detected radiation of the AVHRR/NOAA sensor. The AVHRR sensor is suitable for LST mapping for the overall conditions of soil coverage in Rio Grande do Sul, once the estimated LST, by the three tested methods, was close to the measured air temperature at the selected locations. Sobrino et al. was the most adequate method. Mapping land surface temperature using AVHRR/NOAA sensor

Multi-Temporal Patterns of Urban Heat Island as Response to Economic Growth Management

“…Next, LST is obtained by correcting the radiating surface temperature to the surface emissivity (ε), which is the ratio of the thermal energy radiated by the surface to the thermal energy radiated by a blackbody at the same temperature [40]. The accurate retrieval of LST from thermal spectral bands also requires an estimate of emissivity from surface coverage [41]. Surface emissivity is controlled by factors, such as water content, chemical composition, structure and roughness [42].…”

“…On the other hand, in the urban environment, non-evaporative and impervious surface areas not only play an important role in UHI formation [14] but also in heat generated by anthropogenic sources, such as traffic and industries [44]. This is because the emissivity of soils or sparsely vegetated areas is a function of soil moisture conditions and soil density [17,41,44,45]. The physical fundamentals for such a relation rely on the fact that for any surface material, certain internal properties, such as heat capacity, thermal conductivity and inertia, play important roles in governing the temperature of a body at equilibrium with its surroundings [46].…”

“…The LST obtained from satellite imagery is, strictly speaking, a measure of the "skin temperature" or surface radiometric energy (kinetic) emitted from the land surface and is related to the thermal infrared (TIR) radiation rather than air temperature [36,41], which is more commonly used in physiological studies [50].…”

Avaliação Da Temperatura De Superfície Continental (Tsc) E O Uso Da Terra Na Bacia Da Usina Hidrelétrica De Barra Dos Coqueiros (Go), Por Meio Do Sensoriamento Remoto (Continental Surface Temperature (Tsc) Assessment and the Use of Land in the Basin of the Hydroelectric Plant of Barra Dos Coqueiros (Go) by Means of Remote Sensing.)

“…A TSC é o fluxo de calor dado em função da energia que chega e sai do corpo, sendo de suma importância para o entendimento das interações entre a superfície terrestre e a atmosfera, que por meio de técnica radiométrica é determinada a partir da detecção da radiação de onda longa emitida na faixa do infravermelho (GUSSO, et al, 2007). Especificamente, o intervalo de 8 a 14 µm, é a faixa que permite a melhor transmissão da energia emitida da Terra que alcança o sensor na região do infravermelho termal do espectro eletromagnético.…”

“…Esta faixa é uma janela atmosférica que consiste na "[...] região onde ocorrem as menores interações da atmosfera com a radiação emitida ou refletida pela superfície da Terra. Sensores posicionados de maneira a detectar a radiação, nesta região do espectro eletromagnético, têm sido amplamente utilizados para determinação da TS" (GUSSO et al, 2007).…”