ITHCWY: Robert Ellison's Blog

San Francisco Street Tree Datalapse

San Francisco Street Tree Datalapse

A datalapse video of San Francisco street trees:

City elevation contours and street tree database  from DataSF. I included all trees with a latitude, longitude and known planting date. On the visualization trees grow over 25 years to a generally exaggerated 25 meters radius. Each species of tree is assigned a random color.

Trees at Lands End

Trees at Lands End

Rain falling through trees at Lands End, San Francisco.

Save Mount Davidson

Save Mount Davidson

I just learned that San Francisco's Recreation and Parks department plans to cut down thousands of healthy trees because they are non-native. I really don't understand this nativist movement. At one point San Francisco was part of Gondwanaland. A while before that it was a sea of super-heated plasma. We need more trees even if they were originally Australian. It's a city of transplants anyway.

San Francisco Forrest Alliance seems to be the main hub to try and shut this down. If you live here and like trees please do something. 

Here's a letter I just sent to my Supervisor:

Dear Supervisor Yee,

I am writing to voice my opposition to the plan by the Recreation and Parks Department’s Natural Areas Program to cut down 1,600 trees on Mount Davidson. I have lived in San Francisco for over sixteen years and in your district for a little over two. I regularly walk my dog and take my children to Mount Davidson. We greatly value this park for its views and forest.

Beyond Mount Davidson specifically I am horrified by the thought of felling thousands of healthy trees because they are considered to be non-native. The mission of Recreation and Parks should not be to return San Francisco to its original state. As a taxpayer and homeowner I expect to see a focus on the needs of residents and a management plan that preserves our forested areas rather than denuding them.

Maybe some of the NAP budget could be diverted to fixing up the dilapidated West Portal playground or to pay for maintenance of neighborhood trees rather than their current plan?

Yours faithfully,

Robert Ellison