Detecção de quartzo e argilominerais para o monitoramento de degradação de terras a partir de dados do infravermelho termal do sensor aster

Abstract

In this work, ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer ) Thermal Infrared data (TIR -10 to 14 bands -8. 125-10.95μm) were used to map quartz and clay minerals in land degradation areas, in the southwestern portion of Rio Grande do Sul State, Brazil. This study area presents a specific land degradation process named arenizac ¸ão , which is related to erosion of arenitic rocks and formation of structured sandy soils. Such processes introduce several environmental damages such as increased erosion, reduction in soil fertility and decline of agricultural land use. Using ASTER/TIR data it was possible to replicate important diagnostic spectral features related to the SiO reststrahlen band from clay minerals and quartz. Mineral abundance maps were produced using spectral index and band ratio methods. The results show that ASTER/TIR data were able to map these minerals in the soil and to reveal the degree of mixtures among quartz, clay minerals and others land cover features. Areas simultaneously mapped as quartz-rich and with lower proportion of clay minerals indicate a wealth of sandy soils, scarce vegetation cover and excessive drainage, which leads to large nutrient losses. This approach allows a more precise and quantitative mapping of land degradation characteristics, with important implications to the study of its dynamics in tropical environments.

Identification of mineral components in tropical soils using reflectance spectroscopy and advanced spaceborne thermal emission and reflection radiometer (ASTER) data

“…This fact makes it harder to assess degraded soils in environmental systems, because this type of soil is associated with an intensely erosive processes and poor fertility. The use of ASTER Thermal Infrared bands (TIR -AST10/8.125 μm-AST14/10.95 μm) is highly efficient for this approach, due to its ability to reproduce the main quartz spectral diagnostic feature (reststrahlen bands -~8.2-9.3 μm) (Vicente & Souza Filho, 2010). However, ASTER/TIR's 90-m spatial resolution restricts our goals in this work.…”

Using the WRF Model to Refine NCEP CFSv2 Reanalysis Atmospheric Profile: A Southern Brazil Test Case

“…They are of great significance to the studies of climate, hydrology, geology, ecology, agronomy, and natural disasters (Vicente & Souza Filho, 2010;Anderson et al, 2012;Huo et al, 2015;Gallego-Elvira et al, 2016;Sobrino et al, 2016;Cheng & Kustas, 2019;Nill et al, 2019;Roy et al, 2020).…”

Emissividade dos atributos do solo via sensores terrestres e de satélite

“…Algumas pesquisas recentes revelaram o potencial desta região para a determinação do teor de areia em áreas degradadas e textura do soloEisele et al, 2015;Wang et al, 2015;Müller et al, 2016). No entanto, há poucos relatos de quantificação de atributos com dados de Ɛ, principalmente com dados de satélite, que mostrem valores e feições da Ɛ de objetos presentes em áreas agrícolas tropicais(Vicente e Filho, 2010). Dessa forma, o sensor ASTER mostra-se importante na avaliação de atributos do solo.…”