Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Vegetation Structure Index (VSI): Retrieving Vegetation Structural Information from Multi-angular Satellite Remote Sensing

Version 1 : Received: 21 February 2021 / Approved: 22 February 2021 / Online: 22 February 2021 (12:40:14 CET)

How to cite: Sharma, R.C. Vegetation Structure Index (VSI): Retrieving Vegetation Structural Information from Multi-angular Satellite Remote Sensing. Preprints 2021, 2021020467 (doi: 10.20944/preprints202102.0467.v1). Sharma, R.C. Vegetation Structure Index (VSI): Retrieving Vegetation Structural Information from Multi-angular Satellite Remote Sensing. Preprints 2021, 2021020467 (doi: 10.20944/preprints202102.0467.v1).

Abstract

Utilization of Bidirectional Reflectance Distribution Function (BRDF) model parameters obtained from the multi-angular remote sensing is one of the approaches for the retrieval of vegetation structural information. In this research, the potential of multi-angular vegetation indices, formulated by the combination of multi-spectral reflectance from different view angles, for the retrieval of forest above ground biomass was assessed. This research was implemented in the New England region with the availability of a high quality forest inventory database. The multi-angular vegetation indices were generated by the simulation of the Moderate Resolution Imaging Spectroradiometer (MODIS) BRDF/Albedo Model Parameters Product (MCD43A1 Version 6) based BRDF parameters. The effects of seasonal (spring, summer, autumn, and winter) composites of the multi-angular vegetation indices on above ground biomass, angular relationship of the spectral reflectance with above ground biomass, and the interrelationships between the multi-angular vegetation indices were analyzed. Among the existing multi-angular vegetation indices, only the Nadir BRDF-adjusted NDVI ( and Hot-spot incorporated NDVI ( showed significant relationship (more than 50%) with the above ground biomass. This research proposed two more sensitive vegetation structural indices, Fore-scattering Back-scattering NDVI and Vegetation Structure Index (VSI). The Fore-scattering Back-scattering NDVI showed higher sensitivity (R2 = 0.62, RMSE = 52.46) towards the above ground biomass than existing multi-angular vegetation indices. Furthermore, the VSI performed in the most efficient way explaining 64% variation of the above ground biomass, suggesting that the right choice of the spectral channel and observation geometry should be considered for improving the estimates of the above ground biomass. In addition, the right choice of seasonal data (summer) was found to be important for estimating the forest biomass while other seasonal data were either insensitive or pointless. The promising results shown by the VSI suggest that it could be an appropriate candidate for monitoring vegetation structure from the multi-angular satellite remote sensing.

Subject Areas

Forests; Structure; Biomass; BRDF; MODIS; Multi-angular; NDVI (Fore-Back); Vegetation structure index

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