Prediction of plant diversity in grasslands using Sentinel-1 and -2 satellite image time series

Abstract

The prediction of grasslands plant diversity using satellite image time series is considered in this article. Fifteen months of freely available Sentinel optical and radar data were used to predict taxonomic and functional diversity at the pixel scale (10 m × 10 m) over a large geographical extent (40,000 km²). 415 field measurements were collected in 83 grasslands to train and validate several statistical learning methods. The objective was to link the satellite spectro-temporal data to the plant diversity indices. Among the several diversity indices tested, Simpson and Shannon indices were best predicted with a coefficient of determination around 0.4 using a Random Forest predictor and Sentinel-2 data. The use of Sentinel-1 data was not found to improve significantly the prediction accuracy. Using the Random Forest algorithm and the Sentinel-2 time series, the prediction of the Simpson index was performed. The resulting map highlights the intra-parcel variability and demonstrates the capacity of satellite image time series to monitor grasslands plant taxonomic diversity from an ecological viewpoint.

Plant phenotyping relevance

Sentinel-1/2時系列と統計学習により、草地の植物多様性指数を画素単位で推定・検証する方法が研究の中心であり、植物群落状態の定量的なフェノタイプ推定に該当する。

Code and data availability

The supplied blocks contain only the article's reference list and appendix result tables (histograms, R2 tables). No public phenotype dataset, imagery, author code, or trained model with an authors' deposit URL is described. Cited items (e.g., iota2 zenodo, OTB) are generic third-party tools, not paper-specific assets.

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