| 1. Identificação | |
| Tipo de Referência | Resumo em Evento (Conference Proceedings) |
| Site | mtc-m16d.sid.inpe.br |
| Código do Detentor | isadg {BR SPINPE} ibi 8JMKD3MGPCW/3DT298S |
| Identificador | 8JMKD3MGP7W/3888865 |
| Repositório | sid.inpe.br/mtc-m19/2010/09.09.19.26 |
| Repositório de Metadados | sid.inpe.br/mtc-m19/2010/09.09.19.26.54 |
| Última Atualização dos Metadados | 2021:01.03.02.13.55 (UTC) administrator |
| Chave Secundária | INPE--PRE/ |
| Chave de Citação | CeballosRodr:2010:ClClSa |
| Título | Cloud Classification in Satellite Imagery applied to Assessment of Sunshine Duration and Global Solar Radiation  |
| Ano | 2010 |
| Data de Acesso | 06 maio 2024 |
| Tipo Secundário | PRE CI |
| 2. Contextualização | |
| Autor | 1 Ceballos, Juan Carlos 2 Rodrigues, Marcos Lima |
| Grupo | 1 DSA-CPT-INPE-MCT-BR 2 DSA-CPT-INPE-MCT-BR |
| Afiliação | 1 Instituto Nacional de Pesquisas Espaciais (INPE) 2 Instituto Nacional de Pesquisas Espaciais (INPE) |
| Endereço de e-Mail do Autor | 1 juanc_ceballos@yahoo.com.br 2 marcos.rodrigues@cptec.inpe.br |
| Nome do Evento | The Meeting of the Americas. |
| Localização do Evento | Foz do Iguaçu, BR |
| Data | 08-12 aug 2010 |
| Título do Livro | Abstracts |
| Histórico (UTC) | 2012-01-12 11:42:56 :: valdirene -> administrator :: 2010 2021-01-03 02:13:55 :: administrator -> simone :: 2010 |
| 3. Conteúdo e estrutura | |
| É a matriz ou uma cópia? | é a matriz |
| Estágio do Conteúdo | concluido |
| Transferível | 1 |
| Tipo do Conteúdo | External Contribution |
| Palavras-Chave | Cloud/radiation interaction radiation transmission and scattering radiative processes remote sensing |
| Resumo | Geostationary satellites perform high-frequency observation of VIS reflectance. The so-called cloud index CI is estimated as CI= (L - Lmin)/(Lmax - Lmin) = (R - Rmin)/(Rmax - Rmin). L is radiance and R is reflectance (assuming isotropic outgoing radiance); min and max refer to extreme values expected in VIS channel. The index is an estimate of effective cloud cover; Rmin is easily assessed by cloud masking, but definition of Rmax is not so clearly stated in literature. Value CI < 1 is meaningful only in Cu-covered scenes (CI=1 in other cloud cover situations), so identification of cloud-type is a previous step for CI assessment. For cloud classification four variables (available in GOES and Meteosat) were used: VIS R, brightness temperature Tb in 10.7µm window, and textures XV and XT defined as R and Tb standard deviation in a 3x3-pixel set. Dynamical clustering by minimal Euclidean distance defined a set of N=32 reference centroids; identification of cloud-type versus centroid was made by visual nephanalysis. This set provides the reference for image classification (see operational results at http: //satelite.cptec.inpe.br). Distribution function F(R) of cumulative frequencies of reflectance for different cloud-types shows that Rmax= 0.465 may be adopted as transition value between Cu- and St-type pixels. The same result is found for different regions in South America, suggesting an easy way of assessing Cloud Index (being CI=1 for Rmax>0.465). Values (1-CI) are taken as clear-sky time fraction during interval between two images. Daily integration provides fairly good results for sunshine, shown by comparison with heliograph data. For solar radiation assessment, CPTEC model GL (http: //satelite.cptec.inpe.br/radiacao/) splits solar spectrum in a UV+VIS band (only stratospheric ozone depletion is considered and radiative transfer within troposphere is conservative) and a solar IR band (where transmittance by cloud is negligible and direct beam is affected mainly by H2O and CO2 depletion). Global radiation (GL) in UV+VIS band is only a matter of energy balance, while GL in solar IR is mainly related to direct beam weighted with clear-sky fraction (1-CI). Recent comparisons of monthly mean of GL model x Brazilian network (about 400 stations) were made in Feb. 2010. GOES 12 imagery calibration induces mean deviation of only +10 W.m-2. Conclusion: cloud cover estimated through Cloud Index CI provides clear and valuable information for sunshine duration and solar energy assessments. |
| Área | MET |
| Arranjo | urlib.net > BDMCI > Fonds > Produção anterior à 2021 > DIDSA > Cloud Classification in... |
| Conteúdo da Pasta doc | não têm arquivos |
| Conteúdo da Pasta source | não têm arquivos |
| Conteúdo da Pasta agreement | não têm arquivos |
| 4. Condições de acesso e uso | |
| Idioma | en |
| Grupo de Usuários | valdirene administrator |
| Visibilidade | shown |
| Permissão de Leitura | deny from all and allow from 150.163 |
| Permissão de Atualização | não transferida |
| 5. Fontes relacionadas | |
| Repositório Espelho | sid.inpe.br/mtc-m19@80/2009/08.21.17.02.53 |
| Unidades Imediatamente Superiores | 8JMKD3MGPCW/43SRC6S |
| Acervo Hospedeiro | sid.inpe.br/mtc-m19@80/2009/08.21.17.02 |
| 6. Notas | |
| Campos Vazios | archivingpolicy archivist callnumber copyholder copyright creatorhistory descriptionlevel dissemination doi e-mailaddress edition editor format isbn issn label lineage mark nextedition notes numberoffiles numberofvolumes orcid organization pages parameterlist parentrepositories previousedition previouslowerunit progress project publisher publisheraddress readergroup resumeid rightsholder schedulinginformation secondarydate secondarymark serieseditor session shorttitle size sponsor subject targetfile tertiarymark tertiarytype type url versiontype volume |
| 7. Controle da descrição | |
| e-Mail (login) | simone |
| atualizar | |