基于窗函数的林区ICESat-GLAS波形数据消噪研究.pdfVIP

西北林学院学报 2016 ， 31(1) ， 214~220 Journal of Northwest Forestry University doi:10. 3969/j. issn. 1001-746 1. 2016. 01. 37 基于窗函数的林区 ICESat-GLAS 波形数据消噪研究 王爱娟，邢艳秋\邱赛，王志 (东北林业大学森林作业与环境研究中心，黑龙江哈尔滨 150040) 摘 要:在利用对地学激光测高系统(the Ice , Cloud and land Elevation-Geoscience Laser Altime- ter System)数据估测森林结构参数时，需对原始泼形进行去嗓处理，以提高估测精度。以吉林汪 清林区为例，提出了基于窗函数的林区 GLAS 数据消嗓方法，选取了 5 种窗函数对 GLAS 数据进 行消嗓并比较其消嗓精度。结果表明:窗函数对林区波形数据消嗓具有较好的效果，窗函数消嗓法 的信噪比 SNR 最高为 40.488 679 ，均方根误差 RMSE 最低为 0.000 335;GLAS 数据经窗函数消 嗓后能够合理地预测林区冠层高度，预测冠层高度与实测冠层高度的回归精度 r 从 O. 725 增至 0.820; 本研究所选的几种窗函数中布拉克曼窗函数的消嗓效果较好。结果说明了窗函数在对 IC­ ESat-GLAS 泼形数据消嗓中具有很大的应用潜力。 关键词:ICESAT/GLAS; 林区泼形;消嗓;窗函数 中图分类号:S77 1. 8 文章编号:1001-7461(2016)01-0214-07 文献标志码:A Denoising of Forest ICESat-GLAS Waveform Data Based on Window Function WANG Ai-juan ,XING Yan-qiu ,QIU Sai ,WANG Rui (Center for Forest Operations and Environment ,Northeast Forestry University , Harbin , Heilongjiang 150040 ,China) Abstract: To improve the accuracy of estimating forest parameters by ICESat-GLAS (the Ice ,Cloud ,and land Elevation-Geoscience Laser Altimeter System) waveform data ,the original waveform data needs to be denoised. In Wangqing forest area of Jinlin Province ,based on the window function ,methods of ICESat GLAS waveform data denoising were proposed in the paper ,and 5 window functions were carried out to de noise the GLAS waveforms and analyze the denoising accuracy accordingly. The results showed that ,the window function had a better effect on forest waveform data denoising ,and the highest average signal-to- noise was 40.488 679 ,and the lowest average root-mean-square error was O. 000 335. The GLAS data de- noised by window function