期刊
INTERNATIONAL JOURNAL OF APPLIED EARTH OBSERVATION AND GEOINFORMATION
卷 21, 期 -, 页码 568-576出版社
ELSEVIER
DOI: 10.1016/j.jag.2012.07.016
关键词
TerraSAR-X; SAR; Rice monitoring; Multi-temporal; Biomass estimation; Polarimetry
资金
- National Basic Research Program [973-2009CB118606]
- International Bureau of the German Federal Ministry of Research and Technology BMBF [CHN 08/051]
- Infoterra GmbH (Astrium GEO-Information Services)
- Sino-German Cooperative Nitrogen Management Project [MOST 2007DFA30850]
- GIS & RS group of the University of Cologne
- Qixing Research and Development Center in Heilongjiang
This study assesses the use of TerraSAR-X data for monitoring rice cultivation in the Sanjiang Plain in Heilongjiang Province, Northeast China. The main objective is the understanding of the coherent co-polarized X-band backscattering signature of rice at different phenological stages in order to retrieve growth status. For this, multi-temporal dual polarimetric TerraSAR-X High Resolution SpotLight data (HH/VV) as well as single polarized StripMap (VV) data were acquired over the test site. In conjunction with the satellite data acquisition, a ground truth field campaign was carried out. The backscattering coefficients at HH and VV of the observed fields were extracted on the different dates and analysed as a function of rice phenology to provide a physical interpretation for the co-polarized backscatter response in a temporal and spatial manner. Then, a correlation analysis was carried out between TerraSAR-X backscattering signal and rice biomass of stem, leaf and head to evaluate the relationship with different vertical layers within the rice vegetation. HH and VV signatures show two phases of backscatter increase, one at the beginning up to 46 days after transplanting and a second one from 80 days after transplanting onwards. The first increase is related to increasing double bounce reflection from the surface-stem interaction. Then, a decreasing trend of both polarizations can be observed due to signal attenuation by increasing leaf density. A second slight increase is observed during senescence. Correlation analysis showed a significant relationship with different vertical layers at different phenological stages which prove the physical interpretation of X-band backscatter of rice. The seasonal backscatter coefficient showed that X-band is highly sensitive to changes in size, orientation and density of the dominant elements in the upper canopy. (C) 2012 Elsevier B.V. All rights reserved.
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