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Improving urban tree cover with Google Earth Engine

February 6, 2023
Improving urban tree cover with Google Earth Engine
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Whereas there was plenty of consideration given to wildfires, floods, and hurricanes, heat-related climate occasions are nonetheless understudied and underreported. Each summer season, warmth waves pose a significant risk to the well being of individuals and ecosystems. 83% of the North American inhabitants lives in cities, the place the city warmth island (UHI) impact results in greater native temperatures in comparison with surrounding rural areas. 

However not everybody dwelling in US cities experiences summer season warmth waves and concrete warmth islands equally. Communities with decrease incomes or individuals of shade usually tend to be impacted by excessive warmth occasions, each attributable to fewer inexperienced areas in city areas and never getting access to air-con. Whereas there have been many research which have make clear environmental inequities between neighborhoods of various revenue ranges, there was little evaluation of what it can take to offer all individuals with safety from extreme warmth.

In the summertime of 2019, TC Chakraborty, then a PhD candidate on the Yale College of the Setting, and Tanushree Biswas, then Spatial Information Scientist at The Nature Conservancy, California, met at one in every of our Geo for Good Summits. The summits deliver collectively policymakers, scientists, and different change-makers who use Google’s mapping instruments. They wished to share concepts of their areas of experience (city warmth and tree cowl, respectively) and discover a possible path to handle city local weather change inequities utilizing open instruments and a collection of datasets. Given the power of tree cowl to assist mitigate native warmth in cities, they puzzled how a lot house is definitely out there for timber in decrease revenue city neighborhoods.

If this out there house had been to be quantified, it might present estimates of a number of co-benefits of tree cowl past warmth mitigation, from carbon sequestration to air air pollution discount, to decreased power demand for cooling, to doable well being advantages. Chakraborty and Biswas believed that rising the tree cover on this out there house might present financial alternatives for inexperienced jobs in addition to extra equitable local weather options. Impressed by this shared imaginative and prescient, they joined forces to discover the feasibility of including timber to California’s cities. 

Three years later, in June 2022, Chakraborty, Biswas, and co-authors L.S. Campbell, B. Franklin, S.S. Parker, and M. Tukman revealed a paper to handle this problem. The research combines medium-to-high-resolution satellite tv for pc observations with census knowledge to calculate the possible space out there for city afforestation — planting new timber — for over 200 city clusters in California. The paper demonstrates a scientific method that leverages publicly out there knowledge on Google Earth Engine, Google’s planetary-scale platform for Earth science knowledge & evaluation, which is freed from cost for nonprofits, teachers, and analysis use circumstances. Outcomes from the research may be explored via a Earth Engine net software: Closing City Tree Cowl Inequity (CUTI).

California is essentially the most populated state in the USA, the fifth largest financial system on this planet and regularly impacted by warmth waves. This makes California a primary location to display approaches to strategically decreasing floor UHI (SUHI), which has the potential to positively influence thousands and thousands, particularly these susceptible to warmth threat. Chakraborty et al. (2022) discovered that underprivileged neighborhoods in California have 5.9% much less tree cowl (see Fig. 1 for an illustrative instance for Sacramento) and 1.7 °C greater summer season SUHI depth than extra prosperous neighborhoods. This disparity in tree cowl may be partially closed via focused city afforestation.



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