To train the model, he identified known locations of tree canopy using lidar data and NAIP imagery over California. Using that as ground truth, the model was trained to classify which pixels contain trees in the corresponding satellite images. The result is a machine-learning model that has learned to identify trees just using four-band high-resolution (~1 meter) satellite or aerial imagery—no lidar required! — Medium

After pothole gardeners and pavement crack fillers, the Guerilla Grafters are the next urban hacking collective that wants to make streets a better places for everyone. The collective sees grafting branches of fruit trees onto trees in the streets as an opportunity to provide free access to food to urbanites. The process of adding a small branch to an existing city tree is considered vandalism. However, that doesn’t stop the Guerilla Grafters [...]. — Pop-Up City

Megacities—those urban centers crammed with more than 10 million people—would be well served to double down on their arboreal assets, according to a new paper in the upcoming issue of the journal Ecological Modeling.

A team of researchers led by Theodore Endreny of SUNY’s College of Environmental Studies and Forestry sought to quantify how leafy infrastructure pays dividends in 10 chock-full cities—and the extent to which those benefits could compound if those urban areas planted more trees. — Citylab

CALIFORNIA WON’T BE throwing much shade this summer. It would need trees to do that. Last year almost 30 million trees died in the Golden State—and that number is expected to double or triple by the end of 2016. The high mortality rates come at a time when the state needs healthy forests most, with climate change looming always and a La Niña—El Niño’s dry hermana—on the way. — Wired

We all want our cities to be greener, but it is often quite hard to grow trees in a concrete environment. So, why not turn to waterfronts or lakes to place trees? Rotterdam will get its first ‘bobbing forest’ in 2016: a collection of twenty trees that are floating in the Rijnhaven, a downtown harbor basin. [...]

After experimenting with a sample tree last year, an entire floating forest of twenty trees is scheduled to be ‘planted’ on March 16, 2016. — popupcity.net

Completed in March of 2014, Kusukusu [...] is a marvelous feat of architecture, engineering and technology. Working with Hiroshi Nakamura of NAP Architects, the team came in and 3D-scanned hundreds of points on the tree. Based on that 3D data they then created a steel trellis that threaded through the tree, interlocking perfectly [...]. What’s amazing is that the treehouse in its entirety, never touches the tree. It’s completely self-standing so as to not harm the tree. — spoon-tamago.com

You don’t have to be religious to appreciate the Tree Church in Ohaupo, New Zealand. A heavenly 100-seat chapel set among a 3-acre landscaped garden, the church boasts walls made of living trees planted around an iron frame. In 2011, Barry Cox, who runs a tree relocating business, decided that his backyard was missing an old stone church like the ones he had studied and admired on travels to Europe. — Slate

The city of Melbourne assigned trees email addresses so citizens could report problems. Instead, people wrote thousands of love letters to their favorite trees. — theatlantic.com

In a new paper published Thursday, a team of researchers present a compelling case for why urban neighborhoods filled with trees are better for your physical health.

[...] they found that “having 10 more trees in a city block, on average, improves health perception in ways comparable to an increase in annual personal income of $10,000 and moving to a neighborhood with $10,000 higher median income or being 7 years younger.” — washingtonpost.com

To be recognized as a Great Tree, in New York City, is not just a matter of having the correct heritage or coming from the right family. [...]

For a person, achieving fame or prominence comes with both perks and pitfalls. But what are the advantages of being a celebrated tree? And what are the dangers? While humans have long venerated old and large trees, we've also cut them down and razed whole forests of their less superlative brethren. — atlasobscura.com

Though New York can sometimes seem like a drab warren of chain-link fence and oily pavement, the city actually has an impressive number of trees. On the streets alone [...] there were 592,130 at last reckoning, a leafy explosion you can now peruse in this great visualization of tree species.

Jill Hubley, a Brooklyn web developer whose last project involved mapping local chemical spills, made the chlorophyllous cartography with data from the 2005-2006 Street Tree Census. — citylab.com

The city estimates that some 4,500 of its total 10,750 sidewalk miles are in disrepair. According to a 2007 USC study, the city repaired a grand total of 64 miles of sidewalks, or 1.4 percent of damaged sidewalks, improving the city’s backlog to 72 years.

The reasons for this civic embarrassment go back even longer than 72 years. They are twofold. One is political, the other arboreal. — nextcity.org