Remote sensing of drylands: An overview

Background

Drylands occupy roughly 41% of terrestrial ecosystems and support millions of people through agriculture, livestock production, and ecosystem services. These environments face challenges from climate change, land use transformation, and water scarcity, which alter vegetation structure, biodiversity, and soil processes. Despite harsh conditions, drylands sustain diverse flora and fauna, while also providing critical ecological functions (e.g., carbon sequestration, water regulation, nutrient cycling, etc). Remote sensing has emerged as an essential tool for understanding dryland dynamics by capturing landscape-scale information through satellites, aerial photography, and drone-based imagery.

Goals and Methods

This article synthesizes ecological knowledge and remote sensing applications to explain how technological advances improve the monitoring of dryland ecosystems. It integrates existing literature to provide a conceptual framework linking remote sensing techniques with ecological assessment and management, reviewing satellite platforms such as Landsat and Sentinel, aerial imagery archives, and drone technologies that enable fine-scale monitoring of vegetation structure, forage production, and land cover changes. This overview describes how sensors measure electromagnetic signals to quantify biomass, phenology, and ecological processes across multiple spatial scales.

Conclusions and Takeaways

Remote sensing offers opportunities to monitor ecological change, assess biodiversity patterns, and support restoration planning in drylands. Emerging drone technologies enhance spatial resolution and enable detailed analysis of vegetation structure and ecosystem dynamics. However, challenges remain in interpreting highly variable vegetation signals and integrating multi-scale data. For practitioners, this article highlights the importance of combining remote sensing with ecological knowledge to inform adaptive management, maintain ecosystem services, and achieve sustainable land use in dryland regions.