Pixel-Level Transformers in Remote Sensing: A Canopy Height Case Study

2026-09-29

AI Summary

This study addresses the performance limitations and high computational overhead of Transformers in remote sensing pixel-level regression caused by patch-size constraints. Focusing on medium-resolution satellite imagery, we propose a tree height prediction framework based on pixel-level attention. Methodologically, a pixel-wise Transformer architecture is combined with efficient attention variants and hyperparameter tuning strategies to effectively balance accuracy and efficiency. Experimental results demonstrate that pixel-level attention significantly outperforms large-patch schemes, with the proposed model surpassing conventional methods. This research provides practical architectural design guidelines for remote sensing pixel-level tasks such as biomass estimation, achieving an optimal trade-off between prediction quality and computational resources.

Abstract

Predicting canopy height from medium-resolution satellite imagery is a common and scalable approach for assessing the condition of the world's forests, which play a crucial role in climate change mitigation. While Transformer-based architectures have shown strong performance in many domains, their straightforward application to dense (i.e., pixel-level) regression tasks often yields suboptimal results. In particular, the patch size has a crucial impact on the model performance. In this work, we consider pixel-level attention schemes and show that the resulting models generally outperform those relying on larger patch sizes. However, pixel-level attention can be a prohibitively resource-intensive operation. For this reason, we conduct an extensive experimental study using efficient attention variants to identify favorable trade-offs between prediction quality and resource requirements, facilitating the practical deployment of the proposed models. In addition, we perform a comprehensive comparison with several well-established models in the field and show that, with suitable hyperparameter choices, Transformer-based architectures can outperform competing approaches. Our findings provide practical guidance for designing models for pixel-level regression tasks on medium-resolution satellite imagery, including canopy height and biomass estimation, soil moisture mapping, and yield forecasting.

Problem

• Canopy Height Prediction
• Pixel-Level Regression
• Transformer
• Remote Sensing
• Efficient Attention

Innovation

• Pixel-Level Attention
• Efficient Transformers
• Canopy Height Estimation
• Dense Regression
• Remote Sensing