Please use this identifier to cite or link to this item: https://repositorio.inpa.gov.br/handle/1/17573
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dc.contributor.authorTreuhaft, Robert N.-
dc.contributor.authorGonçalves, Fábio Guimarães-
dc.contributor.authorSantos, João Roberto dos-
dc.contributor.authorKeller, Michael-
dc.contributor.authorPalace, Michael W.-
dc.contributor.authorMadsen, Søren Nørvang-
dc.contributor.authorSullivan, Franklin B.-
dc.contributor.authorGraça, Paulo Maurício Lima Alencastro de-
dc.date.accessioned2020-06-15T21:48:20Z-
dc.date.available2020-06-15T21:48:20Z-
dc.date.issued2015-
dc.identifier.urihttps://repositorio.inpa.gov.br/handle/1/17573-
dc.description.abstractThis letter reports the sensitivity of X-band interferometric synthetic aperture radar (InSAR) data from the first dual-spacecraft radar interferometer, TanDEM-X, to variations in tropical-forest aboveground biomass (AGB). It also reports the first tropical-forest AGB estimates from TanDEM-X data. Tropical forests account for about 50% of the world's forested biomass and play critical roles in the control of atmospheric carbon dioxide by emission through deforestation and uptake through forest growth. The TanDEM-X InSAR data used in this analysis were taken over the Tapajós National Forest, Pará, Brazil, where field measurements from 30 stands were acquired. The magnitude of the InSAR normalized complex correlation, which is called coherence, decreases by about 25% as AGB increases from 2 to 430\ \hbox{Mg-ha}^{-1}, suggesting more vertically distributed return-power profiles with increasing biomass. Comparison of InSAR coherences to those of small-spot (15 cm) lidar suggests that lidar penetrates deeper into the canopies than InSAR. Modeling InSAR profiles from InSAR coherence and lidar profiles yields an estimate of 0.29 dB/m for the X-band extinction coefficient relative to that of lidar. Forest AGB estimated from InSAR observations on 0.25-ha plots shows RMS scatters about the field-estimated AGB between 52 and 62\ \hbox{Mg-ha}^{-1}, which is between 29% and 35% of the average AGB of 179\ \hbox{Mg-ha}^{-1}, depending on the data analysis mode. The sensitivity and biomass-estimation performance suggest the potential of TanDEM-X observations to contribute to global tropical-forest biomass monitoring. © 2004-2012 IEEE.en
dc.language.isoenpt_BR
dc.relation.ispartofVolume 12, Número 2, Pags. 239-243pt_BR
dc.rightsRestrito*
dc.subjectAtmospheric Chemistryen
dc.subjectBiomassen
dc.subjectCarbon Dioxideen
dc.subjectDeforestationen
dc.subjectInterferometersen
dc.subjectOptical Radaren
dc.subjectSensitivity Analysisen
dc.subjectTropicsen
dc.subjectAboveground Biomassen
dc.subjectAtmospheric Carbon Dioxideen
dc.subjectBiomass Estimationen
dc.subjectBiomass Monitoringen
dc.subjectComplex Correlationen
dc.subjectExtinction Coefficientsen
dc.subjectInterferometric Synthetic Aperture Radarsen
dc.subjectTropical Foresten
dc.subjectSynthetic Aperture Radaren
dc.titleTropical-forest biomass estimation at X-band from the spaceborne tandem-X interferometeren
dc.typeArtigopt_BR
dc.identifier.doi10.1109/LGRS.2014.2334140-
dc.publisher.journalIEEE Geoscience and Remote Sensing Letterspt_BR
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