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Registro Completo |
Biblioteca(s): |
Embrapa Solos. |
Data corrente: |
18/04/2019 |
Data da última atualização: |
08/11/2019 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
WALDNER, F.; BELLEMANS, N.; HOCHMAN, Z.; NEWBY, T.; ABELLEYRA, D. de; VERÓN, S. R.; BARTALEV, S.; LAVRENIUK, M.; KUSSUL, N.; LE MAIRE, G.; SIMÕES, M.; SKAKUN, S.; DEFOURNY, P. |
Afiliação: |
FRANÇOIS WALDNER, CSIRO AGRICULTURE & FOOD, AUSTRALIA; NICOLAS BELLEMANS, UNIVERSITE CATHOLIQUE DE LOUVAIN, BELGIUM; ZVI HOCHMAN, CSIRO AGRICULTURE & FOOD, AUSTRALIA; TERENCE NEWBY, AGRICULTURAL RESEARCH COUNCIL, SOUTH AFRICA; DIEGO DE ABELLEYRA, INSTITUTO DE CLIMA Y AGUA, INSTITUTO NACIONAL DE TECNOLOGIA AGROPECUARIA, ARGENTINA; SANTIAGO R. VERÓN, INSTITUTO DE CLIMA Y AGUA, INSTITUTO NACIONAL DE TECNOLOGÍA AGROPECUARIA, ARGENTINA; SERGEY BARTALEV, SPACE RESEARCH INSTITUTE OF RUSSIAN ACADEMY OF SCIENCES, RUSSIA; MYKOLA LAVRENIUK, SPACE RESEARCH INSTITUTE NAS AND SSA, UKRAINE; NATALIIA KUSSUL, SPACE RESEARCH INSTITUTE NAS AND SSA, UKRAINE; GUERRIC LE MAIRE, CIRAD / ECO &SOLS / UNIV MONTPELLIER, FRANCE; MARGARETH GONCALVES SIMOES, CNPS; SERGII SKAKUN, DEPARTMENT OF GEOGRAPHICAL SCIENCES, UNIVERSITY OF MARYLAND, USA; PIERRE DEFOURNY, UNIVERSITÉ CATHOLIQUE DE LOUVAIN, BELGIUM. |
Título: |
Roadside collection of training data for cropland mapping is viable when environmental and management gradients are surveyed. |
Ano de publicação: |
2019 |
Fonte/Imprenta: |
International Journal of Applied Earth Observation and Geoinformation, v. 80, p. 82-93, Aug. 2019. |
DOI: |
10.1016/j.jag.2019.01.002 |
Idioma: |
Inglês |
Conteúdo: |
Cropland maps derived from satellite imagery have become a common source of information to estimate food production, support land use policies, and measure the environmental impacts of agriculture. Cropland classification models are typically calibrated with data collected from roadside surveys which enable the sampling of large areas at a relatively low cost. However, there is a risk of providing biased data as environmental and management gradients may not be fully captured from road networks, thereby violating the assumption of representativeness of calibration data. Despite being widely adopted, the potential biases of roadside sampling have so far not been thoroughly addressed. In this study, we looked for evidence of these biases by comparing three sampling strategies: Random sampling, Roadside sampling, and Transect sampling - a spatially constrained variant of Roadside sampling. In these three strategies, non-cropland data are randomly distributed as they can be photo-interpreted. Based on reference maps at 30 m in four study sites, we followed a Monte Carlo approach to generate multiple realizations of each sampling strategy for ten sample sizes. The effect of the sampling strategy was then assessed in terms of representativeness of the data set collected and accuracy of the resulting maps. Results showed that data sets obtained from Roadside sampling were significantly less representative than those obtained from Random sampling but the resulting maps were only marginally less accurate (2% difference). Transect sampling captured systematically less variability than Random or Roadside sampling which led to differences in accuracy as large as 15%. The effect of sample size on accuracy varied across sites but generally leveled off after reaching 3000 pixels. Augmenting the size of Transect samples improved the classification accuracy but not sufficiently to match the performance of the other sampling strategies. Finally, we found that Random and Roadside training sets with similar representativeness yield comparable accuracy. Therefore, we conclude that roadside sampling can be a viable source of training data for cropland mapping if the range of environmental and management gradients is surveyed. This underlines the importance of survey planning to identify those routes that capture most variability. MenosCropland maps derived from satellite imagery have become a common source of information to estimate food production, support land use policies, and measure the environmental impacts of agriculture. Cropland classification models are typically calibrated with data collected from roadside surveys which enable the sampling of large areas at a relatively low cost. However, there is a risk of providing biased data as environmental and management gradients may not be fully captured from road networks, thereby violating the assumption of representativeness of calibration data. Despite being widely adopted, the potential biases of roadside sampling have so far not been thoroughly addressed. In this study, we looked for evidence of these biases by comparing three sampling strategies: Random sampling, Roadside sampling, and Transect sampling - a spatially constrained variant of Roadside sampling. In these three strategies, non-cropland data are randomly distributed as they can be photo-interpreted. Based on reference maps at 30 m in four study sites, we followed a Monte Carlo approach to generate multiple realizations of each sampling strategy for ten sample sizes. The effect of the sampling strategy was then assessed in terms of representativeness of the data set collected and accuracy of the resulting maps. Results showed that data sets obtained from Roadside sampling were significantly less representative than those obtained from Random sampling but the resulting maps were only mar... Mostrar Tudo |
Thesagro: |
Agricultura; Agricultura de Precisão; Amostragem; Tamanho. |
Thesaurus Nal: |
Accuracy; Agriculture; Classification; Samplers; Sampling. |
Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
Marc: |
LEADER 03464naa a2200385 a 4500 001 2108335 005 2019-11-08 008 2019 bl uuuu u00u1 u #d 024 7 $a10.1016/j.jag.2019.01.002$2DOI 100 1 $aWALDNER, F. 245 $aRoadside collection of training data for cropland mapping is viable when environmental and management gradients are surveyed.$h[electronic resource] 260 $c2019 520 $aCropland maps derived from satellite imagery have become a common source of information to estimate food production, support land use policies, and measure the environmental impacts of agriculture. Cropland classification models are typically calibrated with data collected from roadside surveys which enable the sampling of large areas at a relatively low cost. However, there is a risk of providing biased data as environmental and management gradients may not be fully captured from road networks, thereby violating the assumption of representativeness of calibration data. Despite being widely adopted, the potential biases of roadside sampling have so far not been thoroughly addressed. In this study, we looked for evidence of these biases by comparing three sampling strategies: Random sampling, Roadside sampling, and Transect sampling - a spatially constrained variant of Roadside sampling. In these three strategies, non-cropland data are randomly distributed as they can be photo-interpreted. Based on reference maps at 30 m in four study sites, we followed a Monte Carlo approach to generate multiple realizations of each sampling strategy for ten sample sizes. The effect of the sampling strategy was then assessed in terms of representativeness of the data set collected and accuracy of the resulting maps. Results showed that data sets obtained from Roadside sampling were significantly less representative than those obtained from Random sampling but the resulting maps were only marginally less accurate (2% difference). Transect sampling captured systematically less variability than Random or Roadside sampling which led to differences in accuracy as large as 15%. The effect of sample size on accuracy varied across sites but generally leveled off after reaching 3000 pixels. Augmenting the size of Transect samples improved the classification accuracy but not sufficiently to match the performance of the other sampling strategies. Finally, we found that Random and Roadside training sets with similar representativeness yield comparable accuracy. Therefore, we conclude that roadside sampling can be a viable source of training data for cropland mapping if the range of environmental and management gradients is surveyed. This underlines the importance of survey planning to identify those routes that capture most variability. 650 $aAccuracy 650 $aAgriculture 650 $aClassification 650 $aSamplers 650 $aSampling 650 $aAgricultura 650 $aAgricultura de Precisão 650 $aAmostragem 650 $aTamanho 700 1 $aBELLEMANS, N. 700 1 $aHOCHMAN, Z. 700 1 $aNEWBY, T. 700 1 $aABELLEYRA, D. de 700 1 $aVERÓN, S. R. 700 1 $aBARTALEV, S. 700 1 $aLAVRENIUK, M. 700 1 $aKUSSUL, N. 700 1 $aLE MAIRE, G. 700 1 $aSIMÕES, M. 700 1 $aSKAKUN, S. 700 1 $aDEFOURNY, P. 773 $tInternational Journal of Applied Earth Observation and Geoinformation$gv. 80, p. 82-93, Aug. 2019.
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Embrapa Solos (CNPS) |
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Biblioteca(s): |
Embrapa Clima Temperado. |
Data corrente: |
06/10/2017 |
Data da última atualização: |
24/04/2018 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Circulação/Nível: |
A - 2 |
Autoria: |
GROTH, M. Z.; LOECK, A. E.; NORNBERG, S. D.; BERNARDI, D.; NAVA, D. E. |
Afiliação: |
MZ GROTH; AE LOECK; SD NORNBERG; D BERNARDI; DORI EDSON NAVA, CPACT. |
Título: |
Biology and Thermal Requirements of Fopius arisanus (Sonan, 1932) (Hymenoptera: Braconidae) Reared on Ceratitis capitata Eggs (Wiedemann) (Diptera: Tephritidae). |
Ano de publicação: |
2017 |
Fonte/Imprenta: |
Neotropical Entomology, v. 46, p. 554-560, 2017. |
DOI: |
DOI 10.1007/s13744-017-0528-9 |
Idioma: |
Inglês |
Conteúdo: |
Fopius arisanus (Sonan) é um parasitóide solitário de ovos e as larvas do primeiro instar de Tephritidae. Devido à ocorrência de Ceratitis capitata (Wiedemann) em várias regiões e sob várias condições climáticas, este estudo teve como objetivo avaliar o efeito de diferentes temperaturas no desenvolvimento embrionário (ovo-adulto) e determinar os requisitos térmicos e o número de gerações anuais F. arisanus em ovos de C. capitata. |
Palavras-Chave: |
Degree-days; Development; Egg parasitoid; Fruit fly. |
Thesagro: |
Ceratitis Capitata. |
Thesaurus NAL: |
biological control; Braconidae; Fopius arisanus. |
Categoria do assunto: |
-- |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/164743/1/Dori-Biology-Neotrop-Entomol.pdf
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Marc: |
LEADER 01315naa a2200277 a 4500 001 2076850 005 2018-04-24 008 2017 bl uuuu u00u1 u #d 024 7 $aDOI 10.1007/s13744-017-0528-9$2DOI 100 1 $aGROTH, M. Z. 245 $aBiology and Thermal Requirements of Fopius arisanus (Sonan, 1932) (Hymenoptera$bBraconidae) Reared on Ceratitis capitata Eggs (Wiedemann) (Diptera: Tephritidae).$h[electronic resource] 260 $c2017 520 $aFopius arisanus (Sonan) é um parasitóide solitário de ovos e as larvas do primeiro instar de Tephritidae. Devido à ocorrência de Ceratitis capitata (Wiedemann) em várias regiões e sob várias condições climáticas, este estudo teve como objetivo avaliar o efeito de diferentes temperaturas no desenvolvimento embrionário (ovo-adulto) e determinar os requisitos térmicos e o número de gerações anuais F. arisanus em ovos de C. capitata. 650 $abiological control 650 $aBraconidae 650 $aFopius arisanus 650 $aCeratitis Capitata 653 $aDegree-days 653 $aDevelopment 653 $aEgg parasitoid 653 $aFruit fly 700 1 $aLOECK, A. E. 700 1 $aNORNBERG, S. D. 700 1 $aBERNARDI, D. 700 1 $aNAVA, D. E. 773 $tNeotropical Entomology$gv. 46, p. 554-560, 2017.
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