@Article{TreuhaftGSKPMSG:2015:TrBiEs,
author = "Treuhaft, Robert and Gon{\c{c}}alves, Fabio and Santos, Jo{\~a}o
Roberto dos and Keller, Michael and Palace, Michael and Madsen,
Soren N. and Sullivan, Franklin and Gra{\c{c}}a, Paulo M. L. A.",
affiliation = "{Jet Propulsion Laboratory} and {Woods Hole Research Center} and
{Instituto Nacional de Pesquisas Espaciais (INPE)} and
{International Institute of Tropical Forestry} and {University of
New Hampshire} and {Jet Propulsion Laboratory} and {University of
New Hampshire} and {Instituto Nacional de Pesquisas da
Amaz{\^o}nia}",
title = "Tropical-forest biomass estimation at x-band from the spaceborne
TanDEM-X interferometer",
journal = "IEEE Geoscience and Remote Sensing Letters",
year = "2015",
volume = "12",
number = "2",
pages = "239--243",
month = "Feb.",
keywords = "Biomass, interferometric synthetic aperture radar (InSAR), lidar,
tropical forest.",
abstract = "This 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 Tapajos National Forest, Par, 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 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
Mg-ha(-1), which is between 29% and 35% of the average AGB of 179
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.",
doi = "10.1109/LGRS.2014.2334140",
url = "http://dx.doi.org/10.1109/LGRS.2014.2334140",
issn = "1545-598X",
language = "en",
targetfile = "tropical forest.pdf",
urlaccessdate = "04 maio 2024"
}