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Remote Sensing Technology and Application  2022, Vol. 37 Issue (5): 1056-1070    DOI: 10.11873/j.issn.1004-0323.2022.5.1056
Accuracy Evaluation and Impact Analysis of GEDI Ground Elevation and Canopy Height
Zhihui Yuan1,2(),Sheng Nie2(),Hebing Zhang1,Cheng Wang2,Hongtao Wang1,Xiaohuan Xi2
1.School of Surveying and Land Information Engineering,Henan Polytechnic University,Jiaozuo 454100,China
2.Key Laboratory of Digital Earth Science,Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,China
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Accurate extraction of ground elevation and vegetation canopy height is of great significance for the study of topography, ecology and so on. The new generation of Global Ecosystem Dynamics Investigation (GEDI) launched in December 2018 provides an unprecedented opportunity for accurate extraction of ground elevation and vegetation canopy height over large areas. The purpose of this paper is to verify the accuracies of ground elevation and canopy height extracted by GEDI using airborne LiDAR data, and to explore the influence of geographic positioning error, terrain slope, aspect, vegetation cover, azimuth, acquisition time, beam type and vegetation type on the estimation accuracy. The results show that the estimation accuracies of ground elevation and canopy height can be significantly improved by correcting the geolocation error of GEDI data. The main factor that affects the extraction accuracy of canopy height is vegetation cover, followed by slope; while the extraction accuracy of ground elevation is significantly affected by the aspect and slope. Additionally, the results also indicated that the estimation accuracy is high when the vegetation cover is more than 25%, and the accuracies of ground elevation and canopy height are the highest in gentle slope area with slope 0~5°. Overall, this study will provide a basis for the screening and application of GEDI data.

Key words:  Space-borne LiDAR      GEDI      Ground elevation      Canopy height      Accuracy assessment     
Received:  09 June 2021      Published:  13 December 2022
ZTFLH:  P237  
Corresponding Authors:  Sheng Nie     E-mail:;
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Zhihui Yuan
Sheng Nie
Hebing Zhang
Cheng Wang
Hongtao Wang
Xiaohuan Xi

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Zhihui Yuan,Sheng Nie,Hebing Zhang,Cheng Wang,Hongtao Wang,Xiaohuan Xi. Accuracy Evaluation and Impact Analysis of GEDI Ground Elevation and Canopy Height. Remote Sensing Technology and Application, 2022, 37(5): 1056-1070.

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Fig.1  Study area and GEDI spot distribution map
Table 1  Parameter and path extraction of GEDI data products L2A and L2B
Table 2  Analysis table of different parameters corresponding to each experimental area
Fig.2  Scatter plot of GEDI canopy height and ground elevation estimation in each experimental area
Fig.3  RMSE changes of DTM and CHM before and after translation
Fig.4  Scatter plot of GEDI canopy height and ground elevation estimation in each experimental area after translation
Fig.5  Importance level ranking of canopy height and ground elevation
Fig.6  The order of importance level of canopy height and ground elevation in each experimental area
Fig.7  Variation of RMSE and R2 of DTM with different slopes
Fig.8  Variation of RMSE and R2 of CHM with different slopes
Fig.9  Variation of RMSE and R2 of DTM with different aspect
Fig.10  Variation of RMSE and R2 of CHM with different aspect
Fig.11  RMSE and R2 variation of DTM with different coverage
Fig.12  Variation of RMSE and R2 of CHM with different coverage
Fig.13  RMSE and R2 change diagram of DTM with different azimuth in NIWO experimental area
Fig.14  Variation of RMSE and R2 of CHM at different azimuth in NIWO experimental area
Fig.15  RMSE and R2 variation of DTM at different acquisition time
Fig.16  RMSE and R2 variation of CHM at different acquisition time
Fig.17  RMSE and R2 diagrams of DTM with different beam types
Fig.18  RMSE and R2 diagrams of CHM with different beam types
Fig.19  RMSE and R2 diagrams of DTM of different vegetation types
Fig.20  RMSE and R2 variation of CHM in different vegetation types
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