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首页> 外文期刊>International journal of remote sensing >Towards a detection of grassland cutting practices with dual polarimetric TerraSAR-X data
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Towards a detection of grassland cutting practices with dual polarimetric TerraSAR-X data

机译：利用双极化TerraSAR-X数据检测草原割草实践

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摘要

In this study, polarimetric synthetic aperture radar (SAR) parameters are analysed and compared with in situ measurements in order to develop a methodology for detecting cutting practices within grassland areas. The grasslands were monitored with TerraSAR-X radar imaging in dual polarization HH/VV mode and are located near the banks of the Kasari River, close to the Baltic Sea coast of Estonia. The parameters analysed include HH, VV, HH + VV, and HH- VV backscatter, HH/VV polarimetric coherence magnitude and phase, T_(12) polarimetric coherence magnitude and phase, and also dual polarimetric entropy, alpha, and alpha dominant parameters. Using these parameters derived from the dual polarimetric TerraSAR-X data set, it was virtually impossible to distinguish tall grass (height ＞30 cm) from short grass (height ＜30 cm). On the other hand, it proved feasible to detect areas where grass had been cut and left on the ground. Several parameters showed specific behaviour for the state of grassland and the most notable change was found in the dual polarimetric dominant scattering alpha angle. This angle changed from 10° to 25° after tall grass had been cut and left on the ground. This behaviour of the dominant scattering alpha angle can effectively be described using a particle scattering model for vegetation backscattering.
机译：在这项研究中，对极化合成孔径雷达（SAR）参数进行了分析，并与原位测量结果进行了比较，以便开发出一种方法来检测草原地区的伐木方法。用TerraSAR-X雷达成像以双极化HH / VV模式对草原进行了监测，这些草原位于卡萨里河河岸附近，靠近爱沙尼亚的波罗的海沿岸。分析的参数包括HH，VV，HH + VV和HH-VV反向散射，HH / VV极化相干幅度和相位，T_（12）极化相干幅度和相位，以及双极化熵，α和α主参数。使用源自双极化TerraSAR-X数据集的这些参数，实际上不可能区分高草（高度＞ 30 cm）和短草（高度＜30 cm）。另一方面，证明检测被割草并留在地面上的区域是可行的。几个参数显示了草地状态的特定行为，并且最显着的变化是在双极化主散射α角中。割掉高草并留在地面后，该角度从10°变为25°。可以使用用于植被反向散射的粒子散射模型有效地描述主散射α角的这种行为。

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  • 来源
    《International journal of remote sensing》 |2013年第22期|8081-8103|共23页
  • 作者

    Kaupo Voormansik; Thomas Jagdhuber; Aire Olesk; Irena Hajnsek; Konstantinos P. Papathanassiou;

  • 作者单位

    Institute of Physics, University of Tartu, Tartu 51010, Estonia,Tartu Observatory, 61602 Toravere, Tartumaa, Estonia;

    Microwaves and Radar Institute, German Aerospace Center (DLR),82230 Wessling, Germany;

    Institute of Physics, University of Tartu, Tartu 51010, Estonia,Tartu Observatory, 61602 Toravere, Tartumaa, Estonia;

    Microwaves and Radar Institute, German Aerospace Center (DLR),82230 Wessling, Germany,Institute of Environmental Engineering, ETH Zuerich, 8093 Zuerich,Switzerland;

    Microwaves and Radar Institute, German Aerospace Center (DLR),82230 Wessling, Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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