As Atlanta marks Earth Month, the role of trees in the city’s future is getting renewed attention. For many, Atlanta’s canopy is more than a defining feature of the skyline. It is part of what makes the city livable, recognizable, and deeply valued by the people who call it home.
For nearly two decades, Georgia Tech has been helping the city understand how to sustain that identity as it grows.
Through the Center for Urban Research and Analytics, Georgia Tech has led every comprehensive urban tree canopy assessment for Atlanta since 2008. The latest study, using 2023 satellite imagery and advanced classification methods, provides one of the most detailed looks yet at how land across the city is actually being used.
“This is simply a tool in their planning arsenal,” said Tony Giarrusso, the Georgia Tech researcher who has led each of these studies. “Before they started this work in 2008, everything was anecdotal. It was reactionary.”
Today, Atlanta has something very different: consistent, high-resolution, citywide land cover data that classifies land into tree canopy, non-tree vegetation, and non-vegetation. It is a shift from guesswork to measurement, and from reaction to planning.
Georgia Tech’s role in that shift reflects a broader relationship between the Institute and the city. In Atlanta, research does not stay theoretical. It is used by the city to make decisions.
That matters in a place where growth is constant, and competing priorities such as housing, development, and environmental health often intersect.
The goal of the canopy work is not to advocate for a specific outcome, but to provide clarity.
One of the key tools developed through the latest study is the Potential Planting Index, which identifies where trees could realistically be planted based on existing land conditions. Instead of broad, citywide targets, it allows planners to focus on what is physically possible and where interventions could have the greatest impact.
In addition to the report, Georgia Tech has made much of this work publicly accessible through interactive dashboards, StoryMaps, and geospatial tools that allow users to explore canopy data over time.
These platforms build on decades of research, with urban greenspace studies in Atlanta dating back to 1999, and are designed to give planners, policymakers, and the public a clearer understanding of how land is changing across the city.
But the research also reveals how easy it is to misread progress.
“It gives you a false sense of stability if you don’t understand the underlying land use,” Giarrusso said. “You might see canopy regrowth on paper, but that land could be cleared again tomorrow.”
In a fast-growing city like Atlanta, that scenario is not hypothetical.
“We saw a lot of properties where trees had regrown after initial clearing, but it was temporary and monoculture, low-quality canopy,” he said. “Several of those areas were re-cleared for construction.”
Those patterns, often described as “loss-gain-loss” cycles, can create the appearance of recovery without long-term change.
“Some of the properties were pipe farms, where land was cleared for development with infrastructure like water and sewer lines installed, but the construction never happened,” Giarrusso said. “In Atlanta, trees grow back quickly, and you see ‘canopy gain.’ But, it is usually temporary and is nowhere near the quality of the trees originally cleared.”
Without understanding how land is being used, those cycles can distort how progress is measured and how decisions are made.
That’s why Georgia Tech’s work goes beyond mapping. It connects canopy data to land use, giving city officials a more accurate picture of what is stable, what is temporary, and what is at risk. The research has been delivered to the City of Atlanta and has been used to inform ongoing discussions around zoning, development patterns, and updates to the city’s tree ordinance.
As the city continues to evaluate its next steps, the foundation for those decisions is already in place.
For Georgia Tech, that is the role it is meant to play: not to determine outcomes, but to ensure that when decisions are made, they are grounded in evidence.
It is a model of civic partnership that reflects Atlanta’s identity as a city of growth and change, one that increasingly relies on data to guide its evolution.
As Earth Day approaches, the canopy that defines Atlanta’s character remains a shared priority among communities, policymakers, and researchers alike. And while the future of that canopy will ultimately be shaped by the decisions ahead, one thing is already clear.
Atlanta is no longer guessing. It is planning.
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