# UAV multispectral sensing and data-driven modeling for precision onion yield prediction

## TL;DR

This study uses drones and machine learning to predict onion yields, showing that random forest models work best for accurate predictions.

## Contribution

The study introduces UAV-based multispectral sensing combined with machine learning for precise onion yield prediction in rainy-season crops.

## Key findings

- Random forest models outperformed others in predicting onion yields with high accuracy.
- UAV-derived multispectral data proved effective for capturing crop variability and predicting yields.
- Model performance varied by year, with 2024 data yielding better predictions than 2023.

## Abstract

The integration of unmanned aerial vehicle (UAV)-assisted remote sensing with the Internet of Things (IoT) and Internet of Everything (IoE) offers a robust platform for optimizing precision agriculture by capturing spatiotemporal variability in crop growth. In this context, the present study aimed to predict the bulb yield of rainy-season onion crops across four staggered planting dates using UAV-based multispectral imagery. Canopy reflectance mosaics acquired at key growth stages, along with vegetation indices (VIs), viz. NDVI, NDRE, SAVI, LAI, NORM2, and GNDVI, were extracted for yield modeling. Yield prediction models at three onion growth stages were developed and assessed using five machine learning algorithms: linear regression (lm), random forest (rf), support vector machine with radial kernel (svmRadial), gradient boosting (gbm), and elastic net regression (glmnet), with model training and evaluation performed using 10-fold cross-validation. Among these, random forest consistently outperformed the other models at all growth stages, showing promising results at the bulb development stage, with a training R2 = 0.944, RMSE = 1.919 t ha-1, MAE = 1.523 t ha−1, and a validation R² = 0.755, RMSE = 3.824 t ha−1, and MAE = 3.11 t ha−1. The support vector machine also demonstrated strong generalization (training R² = 0.787; validation R2 = 0.716), highlighting its predictive capability. Year-wise evaluation revealed notable interannual variability in model performance, with models trained on data from 2024 outperforming those from 2023. Overall, these results demonstrate the efficacy of UAV-derived multispectral sensing, combined with machine learning, as an effective, scalable, and timely approach for reliable onion yield prediction and decision support in rainy-season onion crops under varying agronomic conditions.