Forest Height Inversion by Combining Single-Baseline TanDEM-X InSAR Data with External DTM Data
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Title: | Forest Height Inversion by Combining Single-Baseline TanDEM-X InSAR Data with External DTM Data |
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Authors: | He, Wenjie | Zhu, Jianjun | Lopez-Sanchez, Juan M. | Gómez, Cristina | Fu, Haiqiang | Xie, Qinghua |
Research Group/s: | Señales, Sistemas y Telecomunicación |
Center, Department or Service: | Universidad de Alicante. Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal | Universidad de Alicante. Instituto Universitario de Investigación Informática |
Keywords: | TanDEM-X | Forest canopy height | SAR interferometry (InSAR) |
Issue Date: | 27-Nov-2023 |
Publisher: | MDPI |
Citation: | He W, Zhu J, Lopez-Sanchez JM, Gómez C, Fu H, Xie Q. Forest Height Inversion by Combining Single-Baseline TanDEM-X InSAR Data with External DTM Data. Remote Sensing. 2023; 15(23):5517. https://doi.org/10.3390/rs15235517 |
Abstract: | Forest canopy height estimation is essential for forest management and biomass estimation. In this study, we aimed to evaluate the capacity of TanDEM-X interferometric synthetic aperture radar (InSAR) data to estimate canopy height with the assistance of an external digital terrain model (DTM). A ground-to-volume ratio estimation model was proposed so that the canopy height could be precisely estimated from the random-volume-over-ground (RVoG) model. We also refined the RVoG inversion process with the relationship between the estimated penetration depth (PD) and the phase center height (PCH). The proposed method was tested by TanDEM-X InSAR data acquired over relatively homogenous coniferous forests (Teruel test site) and coniferous as well as broadleaved forests (La Rioja test site) in Spain. Comparing the TanDEM-X-derived height with the LiDAR-derived height at plots of size 50 m × 50 m, the root-mean-square error (RMSE) was 1.71 m (R2 = 0.88) in coniferous forests of Teruel and 1.97 m (R2 = 0.90) in La Rioja. To demonstrate the advantage of the proposed method, existing methods based on ignoring ground scattering contribution, fixing extinction, and assisting with simulated spaceborne LiDAR data were compared. The impacts of penetration and terrain slope on the RVoG inversion were also evaluated. The results show that when a DTM is available, the proposed method has the optimal performance on forest height estimation. |
Sponsor: | This work was supported in part by the National Natural Science Foundation of China under Grant 41820104005, Grant 42030112, and Grant 41904004, Hunan Natural Science Foundation under Grant 2021JJ30808, and in part by the Spanish Ministry of Science and Innovation, Agencia Estatal de Investigacion, under Projects PID2020-117303GB-C22/AEI/10.13039/501100011033 and PROWARM (PID2020-118444GA-I00/AEI/10.13039/501100011033). |
URI: | http://hdl.handle.net/10045/138982 |
ISSN: | 2072-4292 |
DOI: | 10.3390/rs15235517 |
Language: | eng |
Type: | info:eu-repo/semantics/article |
Rights: | © 2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
Peer Review: | si |
Publisher version: | https://doi.org/10.3390/rs15235517 |
Appears in Collections: | INV - SST - Artículos de Revistas |
Files in This Item:
File | Description | Size | Format | |
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He_etal_2023_RemoteSens.pdf | 9,78 MB | Adobe PDF | Open Preview | |
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