Use este identificador para citar ou linkar para este item: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1060359
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dc.contributor.authorEBERHARDT, I. D. R.pt_BR
dc.contributor.authorSCHULTZ, B.pt_BR
dc.contributor.authorRIZZI, R.pt_BR
dc.contributor.authorSANCHES, I. D.pt_BR
dc.contributor.authorFORMAGGIO, A. R.pt_BR
dc.contributor.authorATZBERGER, C.pt_BR
dc.contributor.authorMELLO, M. P.pt_BR
dc.contributor.authorIMMITZER, M.pt_BR
dc.contributor.authorTRABAQUINI, K.pt_BR
dc.contributor.authorLUIZ, A. J. B.pt_BR
dc.contributor.authorFOSCHIERA, W.pt_BR
dc.date.accessioned2017-01-10T11:11:11Zpt_BR
dc.date.available2017-01-10T11:11:11Zpt_BR
dc.date.created2017-01-10pt_BR
dc.date.issued2016pt_BR
dc.identifier.citationRemote Sensing, v. 8, n. 3, p. 1-14, 2016.pt_BR
dc.identifier.urihttp://www.alice.cnptia.embrapa.br/alice/handle/doc/1060359pt_BR
dc.descriptionAbstract: The potential of optical remote sensing data to identify, map and monitor croplands is well recognized. However, clouds strongly limit the usefulness of optical imagery for these applications. This paper aims at assessing cloud cover conditions over four states in the tropical and sub-tropical Center-South region of Brazil to guide the development of an appropriate agricultural monitoring system based on Landsat-like imagery. Cloudiness was assessed during overlapping four months periods to match the typical length of crop cycles in the study area. The percentage of clear sky occurrence was computed from the 1 km resolution MODIS Cloud Mask product (MOD35) considering 14 years of data between July 2000 and June 2014. Results showed high seasonality of cloud occurrence within the crop year with strong variations across the study area. The maximum seasonality was observed for the two states in the northern part of the study area (i.e., the ones closer to the Equator line), which also presented the lowest averaged values (15%) of clear sky occurrence during the main (summer) cropping period (November to February). In these locations, optical data faces severe constraints for mapping summer crops. On the other hand, relatively favorable conditions were found in the southern part of the study region. In the South, clear sky values of around 45% were found and no signi?cant clear sky seasonality was observed. Results underpin the challenges to implement an operational crop monitoring system based solely on optical remote sensing imagery in tropical and sub-tropical regions, in particular if short-cycle crops have to be monitored during the cloudy summer months. To cope with cloudiness issues, we recommend the use of new systems with higher repetition rates such as Sentinel-2. For local studies, Unmanned Aircraft Vehicles(UAVs) might be used to augment the observing capability. Multi-sensor approaches combining optical and microwave data can be another option. In cases where wall-to-wall maps are not mandatory, statistical sampling approaches might also be a suitable alternative for obtaining useful crop area information.pt_BR
dc.language.isoengeng
dc.rightsopenAccesseng
dc.subjectMonitoramento agrícolapt_BR
dc.subjectClear sky coveragept_BR
dc.subjectAgriculture monitoringpt_BR
dc.subjectCrop classificationpt_BR
dc.subjectMODISpt_BR
dc.subjectImagem de satélitept_BR
dc.subjectCloudinesspt_BR
dc.titleCloud cover assessment for operational crop monitoring systems in tropical areas.pt_BR
dc.typeArtigo de periódicopt_BR
dc.date.updated2017-03-02T11:11:11Zpt_BR
dc.subject.thesagroSensoriamento remotopt_BR
dc.subject.thesagroAgriculturapt_BR
dc.subject.thesagroNuvempt_BR
dc.subject.nalthesaurusRemote sensingpt_BR
riaa.ainfo.id1060359pt_BR
riaa.ainfo.lastupdate2017-03-02pt_BR
dc.contributor.institutionISAQUE DANIEL ROCHA EBERHARDT, UnB; BRUNO SCHULTZ, INPE; RODRIGO RIZZI, UFPel; IEDA DELÁRCO SANCHES, INPE; ANTONIO ROBERTO FORMAGGIO, INPE; CLEMENT ATZBERGER, University of Natural Resources and Life Sciences, Vienna; MARCIO PUPIN MELLO, The Boing Company; MARKUS IMMITZER, University of Natural Resources and Life Sciences, Vienna; KLEBER TRABAQUINI, Epagri; ALFREDO JOSE BARRETO LUIZ, CNPMA; WILLIAM FOSCHIERA, INPE.pt_BR
Aparece nas coleções:Artigo em periódico indexado (CNPMA)

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