| 1. Identificação | |
| Tipo de Referência | Artigo em Revista Científica (Journal Article) |
| Site | plutao.sid.inpe.br |
| Código do Detentor | isadg {BR SPINPE} ibi 8JMKD3MGPCW/3DT298S |
| Identificador | J8LNKAN8RW/37RDRJ3 |
| Repositório | dpi.inpe.br/plutao@80/2010/07.11.14.04.40 (acesso restrito) |
| Última Atualização | 2010:09.14.12.15.25 (UTC) marciana |
| Repositório de Metadados | dpi.inpe.br/plutao@80/2010/07.11.14.04.41 |
| Última Atualização dos Metadados | 2018:06.05.00.02.15 (UTC) administrator |
| Chave Secundária | INPE--PRE/ |
| DOI | 10.1016/j.jag.2010.06.004 |
| ISSN | 1569-8432 |
| Rótulo | lattes: 5926113161758766 1 BreunigGalvFormEpip:2010:CaStBr |
| Chave de Citação | BreunigGalvFormEpip:2011:CaStBr |
| Título | Directional effects on NDVI and LAI retrievals from MODIS: A case study in Brazil with soybean  |
| Ano | 2011 |
| Mês | Feb |
| Data de Acesso | 10 maio 2024 |
| Tipo de Trabalho | journal article |
| Tipo Secundário | PRE PI |
| Número de Arquivos | 1 |
| Tamanho | 761 KiB |
| 2. Contextualização | |
| Autor | 1 Breunig, Fábio Marcelo 2 Galvão, Lênio Soares 3 Formaggio, Antônio Roberto 4 Epiphanio, José Carlos Neves |
| Identificador de Curriculo | 1 2 8JMKD3MGP5W/3C9JHLF 3 8JMKD3MGP5W/3C9JGJQ 4 8JMKD3MGP5W/3C9JHGM |
| Grupo | 1 DSR-OBT-INPE-MCT-BR 2 DSR-OBT-INPE-MCT-BR 3 DSR-OBT-INPE-MCT-BR 4 DSR-OBT-INPE-MCT-BR |
| Afiliação | 1 Instituto Nacional de Pesquisas Espaciais (INPE) 2 Instituto Nacional de Pesquisas Espaciais (INPE) 3 Instituto Nacional de Pesquisas Espaciais (INPE) 4 Instituto Nacional de Pesquisas Espaciais (INPE) |
| Endereço de e-Mail do Autor | 1 fabiobreunig@gmail.com |
| Endereço de e-Mail | fabiobreunig@gmail.com |
| Revista | International Journal of Applied Earth Observation and Geoinformation |
| Volume | 13 |
| Número | 1 |
| Páginas | 34-42 |
| Nota Secundária | A2_GEOCIÊNCIAS B4_GEOGRAFIA |
| Histórico (UTC) | 2010-07-12 14:42:39 :: lattes -> marciana :: 2010 2010-11-12 10:29:46 :: marciana -> administrator :: 2010 2010-12-08 15:25:20 :: administrator -> marciana :: 2010 2011-07-28 18:06:22 :: marciana -> administrator :: 2010 -> 2011 2011-08-26 18:40:21 :: administrator -> marciana :: 2011 2011-11-03 14:02:26 :: marciana -> administrator :: 2011 2011-11-09 17:30:04 :: administrator -> marciana :: 2011 2011-12-06 17:23:04 :: marciana -> administrator :: 2011 2016-06-04 01:08:45 :: administrator -> marciana :: 2011 2016-10-14 14:34:43 :: marciana -> administrator :: 2011 2018-06-05 00:02:15 :: administrator -> marciana :: 2011 |
| 3. Conteúdo e estrutura | |
| É a matriz ou uma cópia? | é a matriz |
| Estágio do Conteúdo | concluido |
| Transferível | 1 |
| Tipo do Conteúdo | External Contribution |
| Tipo de Versão | publisher |
| Palavras-Chave | MODIS LAI Soybean Viewing geometry NDVI LEAF-AREA INDEX REMOTELY-SENSED DATA VEGETATION INDEXES YIELD ESTIMATION ABSORBED PAR CROP YIELD PRODUCTS FRACTION MODEL REFLECTANCE |
| Resumo | The Moderate Resolution Imaging Spectroradiometer (MODIS) is largely used to estimate Leaf Area Index (LAI) using radiative transfer modeling (the main algorithm). When this algorithm fails for a pixel, which frequently occurs over Brazilian soybean areas, an empirical model (the backup algorithm) based on the relationship between the Normalized Difference Vegetation Index (NDVI) and LAI is utilized. The objective of this study is to evaluate directional effects on NDVI and subsequent LAI estimates using global (biome 3) and local empirical models, as a function of the soybean development in two growing seasons (20042005 and 20052006). The local model was derived from the pixels that had LAI values retrieved from the main algorithm. In order to keep the reproductive stage for a given cultivar as a constant factor while varying the viewing geometry, pairs of MODIS images acquired in close dates from opposite directions (backscattering and forward scattering) were selected. Linear regression relationships between the NDVI values calculated from these two directions were evaluated for different view angles (025°; 2545°; 4560°) and development stages (<45; 4590; >90 days after planting). Impacts on LAI retrievals were analyzed. Results showed higher reflectance values in backscattering direction due to the predominance of sunlit soybean canopy components towards the sensor and higher NDVI values in forward scattering direction due to stronger shadow effects in the red waveband. NDVI differences between the two directions were statistically significant for view angles larger than 25°. The main algorithm for LAI estimation failed in the two growing seasons with gradual crop development. As a result, up to 94% of the pixels had LAI values calculated from the backup algorithm at the peak of canopy closure. Most of the pixels selected to compose the 8-day MODIS LAI product came from the forward scattering view because it displayed larger LAI values than the backscattering. Directional effects on the subsequent LAI retrievals were stronger at the peak of the soybean development (NDVI values between 0.70 and 0.85). When the global empirical model was used, LAI differences up to 3.2 for consecutive days and opposite viewing directions were observed. Such differences were reduced to values up to 1.5 with the local model. Because of the predominance of LAI retrievals from the MODIS backup algorithm during the Brazilian soybean development, care is necessary if one considers using these data in agronomic growing/yield models. |
| Área | SRE |
| Arranjo | urlib.net > BDMCI > Fonds > Produção anterior à 2021 > DIDSR > Directional effects on... |
| Conteúdo da Pasta doc | acessar |
| Conteúdo da Pasta source | não têm arquivos |
| Conteúdo da Pasta agreement | não têm arquivos |
| 4. Condições de acesso e uso | |
| Idioma | en |
| Arquivo Alvo | lenio.pdf |
| Grupo de Usuários | administrator lattes marciana |
| Grupo de Leitores | administrator marciana |
| Visibilidade | shown |
| Política de Arquivamento | denypublisher denyfinaldraft |
| Permissão de Leitura | deny from all and allow from 150.163 |
| Permissão de Atualização | não transferida |
| 5. Fontes relacionadas | |
| Unidades Imediatamente Superiores | 8JMKD3MGPCW/3ER446E |
| Lista de Itens Citando | sid.inpe.br/mtc-m21/2012/07.13.14.51.46 3 |
| URL (dados não confiáveis) | http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6X2F-50GKCG4-1&_user=10&_coverDate=07/08/2010&_alid=1394850111&_rdoc=1&_fmt=high&_orig=search&_cdi=7269&_sort=r&_docanchor=&view=c&_ct=6&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md |
| Divulgação | WEBSCI; PORTALCAPES; MGA. |
| Acervo Hospedeiro | dpi.inpe.br/plutao@80/2008/08.19.15.01 |
| 6. Notas | |
| Campos Vazios | alternatejournal archivist callnumber copyholder copyright creatorhistory descriptionlevel format isbn lineage mark mirrorrepository nextedition notes orcid parameterlist parentrepositories previousedition previouslowerunit progress project rightsholder schedulinginformation secondarydate session shorttitle sponsor subject tertiarymark tertiarytype |
| 7. Controle da descrição | |
| e-Mail (login) | marciana |
| atualizar | |