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Wetland mapping in northern australia using sar

机译：湿地在澳大利亚北部使用sar映射

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The coastal environment of northern Australia is dominated by relatively unmodified wetlands. These ecosystems represent a unique challenge from a remote sensing perspective due to their inherent heterogeneity and strong seasonal variation. This paper focuses on the utility of multi-frequency polarimetric Synthetic Aperture Radar (SAR) data in mapping the vegetation of a tropical wetland. Radar backscatter at lower wavelengths interact with the grasses and sedges of the floodplain, whereas the longer wavelengths are attenuated by vegetation but preserve variation caused by soil characteristics. Radar's sensitivity to structural differences allows the discrimination of grasses and sedges. In contrast, remotely sensed data using optical wavelengths such as Landsat TM, SPOT XS data, and even colour aerial photographs, provide relatively little information in this environment. Classification results are presented using the backscatter intensities at three frequencies and the scattering mechanisms derived from the phase and correlation of co-polarised returns. It was concluded that SAR facilitates more detailed and accurate mapping of the ecologically important wetlands of northern Australia than previously possible with optical data. This is of particular importance in view of SAR's ability to monitor seasonal variations in this environment independent of cloud cover, which is ubiquitous for the wet season.
机译：澳大利亚北部的沿海环境由相对未经修饰的湿地主导。由于其固有的异质性和强大的季节性变化，这些生态系统代表了遥感视角的独特挑战。本文重点介绍了多频偏振合成孔径雷达（SAR）数据在映射热带湿地植被时的效用。雷达反向散射在较低波长下与泛洪叶的草和曲线相互作用，而较长的波长被植被衰减，但保持土壤特征引起的变化。雷达对结构差异的敏感性允许辨别草和淀粉。相反，使用诸如Landsat TM，Spot XS数据甚至彩色空中照片的光波长的远程感测数据在该环境中提供相对较少的信息。使用三个频率的反向散射强度以及衍生自共偏振返回的相位的散射机制来呈现分类结果。得出的结论是，SAR促进了澳大利亚北部的生态重要湿地的更加详细和准确的映射，而不是以前可能的光学数据。考虑到SAR监测这种环境中的季节变化的能力，这是特别重要的是，独立于云覆盖，这对于湿季节无处不在。

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