Analysis of ICESat/GLAS waveform data for characterizing forests in a hilly region

International Symposium on Lidar and Radar Mapping Technologies Pub Date : 2011-10-24 DOI:10.1117/12.913959

C. Hilbert, C. Schmullius, M. Zink

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Abstract

ICESat/GLAS data for a temperate forest in a hilly region were analysed regarding the potential to retrieve maximum canopy height using a direct approach. The GLAS height was derived by calculating the range of the waveform Signal Begin and the Ground Peak. The comparison with an inventory data base and airborne lidar based heights revealed that the GLAS height overestimates the reference heights by on average 5 m and 7 m, respectively (Std=6 m and Std=5 m). The GLAS waveforms were further investigated regarding the canopy structure and the ground surface topography. It was found that the waveforms are most influenced by the ground surface topography. The topography clearly affects the waveform shape and therefore also the accuracy of the GLAS height estimation. Waveforms corresponding to footprints with a mean slope up to 10° have a high potential to derive tree height. The correlation between the GLAS and reference heights is still fair for waveforms of moderate slope 10-15°. Higher slopes clearly challenge the analysis of the waveform structure and the derivation of forest parameters.

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丘陵地区森林特征的ICESat/GLAS波形数据分析

对丘陵地区温带森林的ICESat/GLAS数据进行了分析，分析了使用直接方法获取最大冠层高度的可能性。通过计算波形信号起点和地峰的范围，推导出GLAS高度。通过与库存数据库和机载激光雷达高度的比较发现，GLAS高度比参考高度平均高估了5 m和7 m (Std=6 m和Std=5 m)，并进一步研究了GLAS波形对冠层结构和地表地形的影响。结果表明，波形受地表地形的影响最大。地形明显影响波形形状，因此也影响GLAS高度估计的准确性。与平均坡度高达10°的足迹相对应的波形具有很高的推导树高的潜力。对于中等坡度10-15°的波形，GLAS与参考高度之间的相关性仍然是公平的。较高的坡度显然对波形结构的分析和森林参数的推导提出了挑战。

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International Symposium on Lidar and Radar Mapping Technologies

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