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Forest and Grassland Resources Research >

2022 , Vol. 0 >Issue 4: 119 - 125

DOI: https://doi.org/10.13466/j.cnki.lyzygl.2022.04.015

Technical Application

Forest canopy height inversion based on interferometric phase-coherence amplitude method and baseline selection

  • Hongbin LUO ,
  • Cairong YUE ,
  • Ning WANG
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  • College of Forestry,Southwest Forestry University,Kunming,650224,China

Received date: 2022-05-24

  Revised date: 2022-07-06

  Online published: 2022-10-13

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Abstract

Forest canopy height is an important parameter.In this paper,the phase-coherence amplitude method as the forest height inversion model based on airborne multi-baseline PolInSAR data acquired in the Gabonese Republic on the west coast of Central Africa,the RVoG three-stage method is used to calculate the forest canopy height in the phase difference part,and compared the differences of forest canopy height inversion results under four baseline selection methods of PROD,LINE,ECC and VAR.The results show that among the inversion results with four different baseline selections,the best inversion results are obtained using the LINE method for baseline selection with R2 of 0.746,RMSE with 7.715m,and BIAS with -3.412m,which are more satisfactory.The inversion accuracy of baseline selection using the PROD and ECC methods is slightly lower than that of the LINE method,and the difference between them is not significant.The R2 of the baseline selection inversion results using the ECC method is 0.732,RMSE is 7.918m,and BIAS is 0.139m,and the underestimation and overestimation in the inversion results are more obvious.The inversion results of baseline selection using the PROD method have an R2 of 0.720,RMSE of 8.099m,and BIAS of -4.056m,showing a slight overestimation overall.The inversion results of baseline selection by VAR method had the lowest accuracy among all methods,with R2 of -0.245,RMSE of 17.079m,and BIAS of 12.945m,and the overall underestimation was more serious,and serious underestimation occurred after the forest canopy height was greater than 10m.The findings suggest that multi-baseline PolInSAR can accurately and efficiently invert forest canopy height,but the baseline selection method has a significant effect on the results.

Key words： Phase-coherence amplitude method; RVoG three-stages method; PolInSAR; multiple baselines; baseline selection

Cite this article

Hongbin LUO , Cairong YUE , Ning WANG . Forest canopy height inversion based on interferometric phase-coherence amplitude method and baseline selection[J]. Forest and Grassland Resources Research, 2022 , 0(4) : 119 -125 . DOI: 10.13466/j.cnki.lyzygl.2022.04.015

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