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首页> 外文会议>Envisat and ERS Symposium >COMPARISON OF STEM VOLUME RETRIEVAL ACCURACY IN BOREAL FOREST USING MULTI-TEMPORAL ERS COHERENCE IMAGES
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COMPARISON OF STEM VOLUME RETRIEVAL ACCURACY IN BOREAL FOREST USING MULTI-TEMPORAL ERS COHERENCE IMAGES

机译：利用多时颞射门图像比较北方林林林部的茎体检索精度

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The availability of multi-temporal ERS one-day coherence images and extensive in situ data from test sites located in Sweden, Finland and Siberia has allowed a first assessment on the consistency of stem volume retrieval at stand level within the boreal zone. The test sites are characterised by different forest structure and ground properties. The coherence data had baselines up to 374 m. The relationship between coherence and stem volume measurements and the spread of the coherence measurements depended on the environmental conditions at and between image acquisitions, specific features of the test site (e.g. forest homogeneity, ground dielectric properties) and ground data accuracy. To retrieve stem volume the semi-empirical Interferometric Water Cloud Model, IWCM, was used and it was compared to a simple empirical model. The IWCM could describe the trend in the observations under all environmental and baseline conditions. The accuracy of stem volume retrieval depended on environmental conditions and forest stand structure as well as ground data. Frozen and stable weather conditions were most suitable for retrieval. Smaller errors were obtained at managed test sites. For natural forests the spread of the measurements affected the retrieval negatively. Multi-temporal combination of estimates from individual images could yield results comparable to in situ measurements for managed homogeneous forest stands.
机译：从位于瑞典的测试站点，芬兰和西伯利亚的测试站点的多颞ers的可用性，允许第一次评估北方区域内立体水平的茎体检索的一致性。测试部位的特征在于不同的森林结构和地面特性。相干数据具有高达374米的基线。相干性和茎体测量的关系和相干测量的扩散依赖于图像采集的环境条件，测试部位的特定特征（例如森林均匀性，地基介电性能）和地面数据精度之间的环境条件。为了检索杆体积，使用半经验干涉水云模型，IWCM，并将其与简单的经验模型进行比较。 IWCM可以描述所有环境和基线条件下的观察结果的趋势。茎体检索的准确性取决于环境条件和森林站结构以及地面数据。冷冻和稳定的天气条件最适合检索。在托管测试站点获得了较小的错误。对于天然森林，测量的传播影响了回归的负面影响。来自个别图像的估计的多时间组合可以产生与管理均质林部的原位测量相当的结果。

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