Imaging Spectrometry and Vegetation Science

Kumar, Lalit; Schmidt, K.S.; Dury, S.; Skidmore, A.K.

doi:10.1007/978-0-306-47578-8_5

Cited by 164 publications

(204 citation statements)

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“…Forage composition, attributes, biomass and plant species and cultivars can be measured using field-portable instruments at ground level or from planes or satellites (Milton et al, 2009). This has been applied to pastures and rangelands (Kumar et al, 2001;Schellberg et al, 2008). For example, in temperate Australia 50% to 70% of the variance in growth rate of annual pastures could be predicted from satellite imagery (Hill et al, 2004;Donald et al, 2010) and accumulated pasture growth usefully estimated from sequential measurements.…”

Section: Evaluation Of Pasture Attributesmentioning

confidence: 99%

The importance of grasslands for animal production and other functions: a review on management and methodological progress in the tropics

Boval

Dixon

2012

Animal

175

106

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The global importance of grasslands is indicated by their extent; they comprise some 26% of total land area and 80% of agriculturally productive land. The majority of grasslands are located in tropical developing countries where they are particularly important to the livelihoods of some one billion poor peoples. Grasslands clearly provide the feed base for grazing livestock and thus numerous high-quality foods, but such livestock also provide products such as fertilizer, transport, traction, fibre and leather. In addition, grasslands provide important services and roles including as water catchments, biodiversity reserves, for cultural and recreational needs, and potentially a carbon sink to alleviate greenhouse gas emissions. Inevitably, such functions may conflict with management for production of livestock products. Much of the increasing global demand for meat and milk, particularly from developing countries, will have to be supplied from grassland ecosystems, and this will provide difficult challenges. Increased production of meat and milk generally requires increased intake of metabolizable energy, and thus increased voluntary intake and/or digestibility of diets selected by grazing animals. These will require more widespread and effective application of improved management. Strategies to improve productivity include fertilizer application, grazing management, greater use of crop by-products, legumes and supplements and manipulation of stocking rate and herbage allowance. However, it is often difficult to predict the efficiency and cost-effectiveness of such strategies, particularly in tropical developing country production systems. Evaluation and on-going adjustment of grazing systems require appropriate and reliable assessment criteria, but these are often lacking. A number of emerging technologies may contribute to timely low-cost acquisition of quantitative information to better understand the soil–pasture–animal interactions and animal management in grassland systems. Development of remote imaging of vegetation, global positioning technology, improved diet markers, near IR spectroscopy and modelling provide improved tools for knowledge-based decisions on the productivity constraints of grazing animals. Individual electronic identification of animals offers opportunities for precision management on an individual animal basis for improved productivity. Improved outcomes in the form of livestock products, services and/or other outcomes from grasslands should be possible, but clearly a diversity of solutions are needed for the vast range of environments and social circumstances of global grasslands.

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Section: Evaluation Of Pasture Attributesmentioning

confidence: 99%

The importance of grasslands for animal production and other functions: a review on management and methodological progress in the tropics

Boval

Dixon

2012

Animal

175

106

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“…They used four wavelength bands, centered at 670, 700, 740 and 780nm. Reflectance measurements at 670nm and 780nm are used to estimate the inflection point reflectance (Equation 1) and a linear interpolation procedure is applied between 700nm and 740nm to estimate the wavelength of the inflection point (Equation 2) [7] 2 780 670 …”

Section: Methodsmentioning

confidence: 99%

“…Hyperspectral remote sensor data can provide a significant enhancement of spectral measurement capabilities over conventional remote sensor systems that can be useful for the identification and subsequent modeling of terrestrial ecosystem characteristics [7][8] .…”

Section: Introductionmentioning

confidence: 99%

Hyperspectral Remote Sensing of Vegetation Using Red Edge Position Techniques

Shafri¹,

Salleh²,

Ghiyamat³

2006

American J. of Applied Sciences

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Two red edge position (REP) techniques, Linear and Lagrangian, were applied on hyperspectral data acquired from the HyMap sensor for a forested area in Thetford Forest, UK. Red edge positions of different vegetation covers were extracted with the two approaches from the hyperspectral data. Based on the estimated REPs, the Linear and Lagrangian interpolation methods were compared with ground reference image to analyse different vegetation types and ages. Experimental results of both interpolation techniques indicate that the wavelength and reflectance of REP for younger plants (higher chlorophyll content) shift towards longer wavelength and of higher reflectance in comparison with older plants (lower chlorophyll content).

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Section: Análise Discriminanteunclassified

“…Segundo Hair et al (2009) (FILELLA et al, 1995;KUMAR et al, 2001;ABDEL-RAHMAN et al, 2013). Folhas saudáveis apresentam uma feição de reflectância típica, centrada em 550 nm (região do verde), uma vez que a luz verde é absorvida em menores quantidades quando comparadas com a luz azul e vermelha, sendo a luz verde predominante em relação energia refletida e transmitida para esta faixa do espectro, sendo esse o motivo pelas plantas apresentarem a cor verde (KUMAR et al, 2001;PONZONI et al, 2012). No entanto, esta absorção é significante e aumenta com o incremento da concentração de clorofila na folha, que por sua vez é diretamente sensível a captação de nitrogênio pela planta (TERASHIMA et al, 2009 De acordo com , a reflectância na região do infravermelho próximo resulta da interação da energia incidente com a estrutura do mesófilo.…”

Section: Análise Discriminanteunclassified

Dados hiperespectrais de dossel e sua correlação com nitrogênio aplicado a cultura da cana-de-açúcar

Barros¹

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Imaging Spectrometry and Vegetation Science

Cited by 164 publications

References 0 publications

The importance of grasslands for animal production and other functions: a review on management and methodological progress in the tropics

The importance of grasslands for animal production and other functions: a review on management and methodological progress in the tropics

Hyperspectral Remote Sensing of Vegetation Using Red Edge Position Techniques

Dados hiperespectrais de dossel e sua correlação com nitrogênio aplicado a cultura da cana-de-açúcar

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