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FIGURE 14. Forest imaging results at different polarizations: (a) HH, (b) HV, (c) VH, and (d) VV.

Mean Tree Height = 10.0667 m
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FIGURE 15. Forest height inversion results: the (a) height of the scene and (b) height statistics.

by polarization crosstalk and amplitude imbalance, the
inversion forest-height values remain unchanged.
The result indicates that, when using the DEM differencing method with coherence optimization, the polarimetric distortions show no effect in the presence of noise.
After -20 dB of Gaussian white noise are added, that is,
JUNE 2020

IEEE GEOSCIENCE AND REMOTE SENSING MAGAZINE

N 2 0, the inversion result is shown in Figure 16(b): the
tree height is overestimated, and error is significantly increased. Comparing Figures 16(a) and (b), it can be seen
that polarimetric distortion and system noise together
cause forest-height detection errors, which is consistent
with (68).
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IEEE Geoscience and Remote Sensing Magazine - June 2020

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