Abstract
Abstract. In this paper, the effects of coherence on forest height estimation by SINC model based on Tandem-X InSAR data were explored. First, different coherence calculation methods and different window sizes were used to obtain interferometric coherence images. Then, the forest heights were obtained based on SINC model. Finally, the estimated forest heights were validated against reference data from airborne LIDAR CHM (Canopy height model, CHM). The results showed that the coherence calculation algorithm affect the forest height inversion results with SINC model. The algorithm using only phase information for coherence calculation show better performance than the other one using both magnitude and phase information. Meanwhile, window size selecting for coherence calculation also affect the forest height estimation results. In this study, window size with 9 × 9 shows best agreement with the forest height extracted from LiDAR CHM. The R2 and RMSE are 0.656 and 3.54 m, respectively.
Highlights
Interferometric synthetic aperture Radar (InSAR) technology has the potential to extract the vertical structure information of the target
The other is based on coherent scattering model and coherence information to forest height inversion. The former needs the supporting of high-resolution DEM, which limits its use in large areas
We aim to explore the effects of coherence on forest height inversion with SINC model
Summary
Interferometric synthetic aperture Radar (InSAR) technology has the potential to extract the vertical structure information of the target. The other is based on coherent scattering model and coherence information to forest height inversion. The former needs the supporting of high-resolution DEM, which limits its use in large areas. Among the methods with coherent scattering model and coherence information, SINC model was approved a simple and reliable method for forest height inversion (Cloude, 2016). It is simplified from the RVoG (Random Volume over Ground) model. We aim to explore the effects of coherence on forest height inversion with SINC model. We explored the effect of the flat earth on forest height estimated by SINC model
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