Landscape Architect & Specifier News

AUG 2017

LASN is a photographically oriented, professional journal featuring topics of concern and state-of-the-art projects designed or influenced by registered Landscape Architects.

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The Treepedia Green View Index shows the tree canopy on city streetscapes. Boston (pictured) has a tree index score of 18.2 percent. The brown dots let planners (or anyone, for that matter) quickly glimpse where trees are lacking. Street Trees Index Cities that want to plant more trees along their streets have a new planning tool at their disposal. Treepedia http://senseable.mit.edu/ is an online resource/planning tool that uses millions of neighborhood photos from Google Street View to calculate the canopy coverage ("Green View Index") of cities around the world. The site is the brainchild of the MIT Senseable City Lab, and has been up since last December. It currently posts block-by- block tree maps of 19 cities. The site developed "a scaleable and universally applicable method by analyzing the amount of green perceived while walking down the street." Because Treepedia is using street views as the source of the tree count, as opposed to satellite imagery, its Green View Index does not take city parks into account, which skews the percentage of canopy coverage for such cities as Paris (8.8% street tree canopy) and New York City (13.5%), to mention two. Of the cities charted thus far, Singapore has the highest tree index score (29.3%), with Sydney and Vancouver coming in second at 25.9%. Of the six U.S. cities thus far mapped, Sacramento has the highest median index score (23.6%), followed by Seattle (20%), Miami (19.4%), Boston (18.2%) and Los Angeles (15.2%). By scrolling your mouse wheel, the site allows you to zoom in to take a closer look. There is also a city comparison button. 68 Landscape Architect and Specifier News I n f o r m a t i o n R e q u e s t # 5 7 5

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