Análise espaço-temporal do uso da terra em parte do semi-árido cearense

Andrade, Joachim; Oliveira, Teógenes Senna de

doi:10.1590/s0100-06832004000200018

Cited by 3 publications

(3 citation statements)

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Section: Methodsmentioning

confidence: 99%

“…The distance between areas ranged from 1.7 km (1 and 2) to 7.67 km (1 and 3). The areas have been previously used for extensive farming and can be classified as Caatinga vegetation (open, shrubby, dry forest) (Andrade & Oliveira 2004;Miles et al 2006). As found in other Caatinga regions, Fabaceae and Euphorbiaceae are the two most abundant groups (Santos & Melo 2010;Calixto & Drumond 2011).…”

Section: Study Area and Speciesmentioning

confidence: 99%

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Microsite abiotic conditions and juvenile response under three early successional shrub/tree species in a SEMI‐ARID region

et al. 2022

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In environments with water and nutrient constraints, some early successional shrub/tree species may promote facilitation by ameliorating the microclimate and increasing resource availability. We ask whether early successional semi‐arid shrub/tree species have facilitation effects for other woody species and if they do, which mechanisms are involved and how they affect the water status of juvenile plants. Three early successional woody species; Combretum leprosum, Cenostigma bracteosum and Mimosa tenuiflora, were chosen for investigation. The richness of regenerating woody species and their leaf water potential were used as response variables, while air and soil temperature, leaf area index, humidity and soil attributes were used as explanatory environmental variables. Species growing under the canopy of C. leprosum had better water status and growth at higher soil moisture and lower thermal and solar radiation stress, receiving a facilitative effect. The lower leaf area index, higher radiation and more negative soil water content under the canopy of C. bracteosum in comparison to C. leprosum may have a small negative effect on species richness. M. tenuiflora did not reduce environmental stress, and the species associated with it had low water potential, thus no increase in species richness was detected under its canopy. C. leprosum and C. bracteosum improve the environmental conditions under their canopies and provide favourable microsites for the establishment of other species. The positive effects may be generated by functional traits that modify microclimatic characteristics under the nurse species' canopy and lead to a higher water status of the juveniles growing under it.

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Section: Methodsmentioning

confidence: 99%

Section: Study Area and Speciesmentioning

confidence: 99%

Microsite abiotic conditions and juvenile response under three early successional shrub/tree species in a SEMI‐ARID region

et al. 2022

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“…Novas técnicas foram introduzidas para o mapeamento de uso e cobertura da terra, com o intuito de identificar os padrões e formas dos objetos geográficos em imagens de satélites. A diversidade de trabalhos com o emprego do sensoriamento remoto denotou o potencial das imagens ópticas nos estudos ambientais (AJAJ et al, 2017;ANDRADE;OLIVEIRA, 2004;AQUINO et al, 2012;CHEN et al, 2006;DRONOVA et al, 2012;ESTOQUE;MURAYAMA, 2015;PONZONI, 2009;RIBEIRO;ALBUQUERQUE, 2017;RUDORFF et al, 2007). Procedeu-se, com isso, uma riqueza de métodos de mapeamento de uso e cobertura da terra, com diversas aplicações e resultados.…”

Section: Materiais E Métodounclassified

Uso E Cobertura Da Terra E O Processo De Desertificação No Polo Regional De Jeremoabo-Bahia

Junior

Pereira

Lobão

et al. 2020

Rev. Geogr. (Recife, Online)

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No jogo de relações entre a sociedade e a natureza nas terras secas, a insustentabilidade ambiental das práticas, técnicas e tecnologias humanas configuram cenários de desertificação nas diferentes escalas espaciais, sejam locais, nacionais e regionais. Por meio desta pesquisa, analisou-se o uso e cobertura da terra como indicador ambiental de desertificação no polo regional de Jeremoabo, estado da Bahia. Construiu-se o mapa de uso e cobertura da terra pela interpretação de imagens LANDSAT-8, associada aos dados de campo. Alguns testes foram realizados para a definição das classes dos mapas, de acordo com os dados de campo, resolução da imagem, escala cartográfica do mapa e referências sobre o tema. A agropecuária é um fator da supressão das feições vegetais em favor da ampliação dos campos de agricultura e de pecuária, que se estendem em mais de 15,4 mil km2, com indicativos de deterioração da vegetação e do ambiente, observáveis na (re)classificação das feições vegetais, a partir do qualitativo antropizada, para apontar a pressão na biodiversidade. Os níveis acentuados de degradação equivalem às classes Solo Exposto e Superfície Erosiva Flúvio-pluvial, resultantes da supressão da cobertura vegetal sobre os Neossolos, altamente suscetíveis aos processos erosivos.

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Overview of Intercalibration of Satellite Instruments

Chander

Hewison

Fox

et al. 2013

IEEE Trans. Geosci. Remote Sensing

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139

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Intercalibration of satellite instruments is critical for detection and quantification of changes in the Earth's environment, weather forecasting, understanding climate processes, and monitoring climate and land cover change. These applications use data from many satellites; for the data to be interoperable, the instruments must be cross-calibrated. To meet the stringent needs of such applications, instruments must provide reliable, accurate, and consistent measurements over time. Robust techniques are required to ensure that observations from different instruments can be normalized to a common scale that the community agrees on. The long-term reliability of this process needs to be sustained in accordance with established reference standards and best practices. Furthermore, establishing physical meaning to the information through robust Système International d'unités traceable calibration and validation (Cal/Val) is essential to fully understand the parameters under observation. The processes of calibration, correction, stability monitoring, and quality assurance need to be underpinned and evidenced by comparison with "peer instruments" and, ideally, highly calibrated in-orbit reference instruments. Intercalibration between instruments is a central pillar of the Cal/Val strategies of many national and international satellite remote sensing organizations. Intercalibration techniques as outlined in this paper not only provide a practical means of identifying and correcting relative biases in radiometric calibration between instruments but also enable potential data gaps between measurement records in a critical time series to be bridged. Use of a robust set of internationally agreed upon and coordinated intercalibration techniques will lead to significant improvement in the consistency between satellite instruments and facilitate accurate monitoring of the Earth's climate at uncertainty levels needed to detect and attribute the mechanisms of change. This paper summarizes the state-of-the-art of postlaunch radiometric calibration of remote sensing satellite instruments through intercalibration.

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Análise espaço-temporal do uso da terra em parte do semi-árido cearense

Cited by 3 publications

References 0 publications

Microsite abiotic conditions and juvenile response under three early successional shrub/tree species in a SEMI‐ARID region

Microsite abiotic conditions and juvenile response under three early successional shrub/tree species in a SEMI‐ARID region

Uso E Cobertura Da Terra E O Processo De Desertificação No Polo Regional De Jeremoabo-Bahia

Overview of Intercalibration of Satellite Instruments

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