[CANUFNET] Cities that successfully increased tree canopy?

[Jeremy Cantor]

...and one more to add. Richmond Hill, Ontario had a 4.6% gain from
2010-2016. Sorry I left them off.

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Jeremy Cantor

Director

Geospatial Services


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On Mon, Dec 16, 2019 at 8:32 PM Grace Golightly <gragoli at gmail.com> wrote:

> Thanks for this breakdown, Jeremy. That's very helpful. I will look for
> more information on Washington DC's successful methods.
> Many thanks to everyone who replied to my question!
>
> Best wishes,
> Grace
>
> On Mon, Dec 16, 2019 at 3:49 PM Jeremy Cantor <jeremycantor at planitgeo.com>
> wrote:
>
>> Grace,
>>
>> As Ian said last week, we have seen a number of communities achieve a
>> gain in canopy in time spans ranging from 5 to 15 years:
>>
>>    - Washington, D.C.: +.9%
>>    - Snoqualmie, Washington: +2.4%
>>    - Colorado Springs, CO: +2.7%
>>    - Dallas, Texas: +3%
>>    - Mississauga, Ontario: +4.2%
>>    - Salem, Oregon: +5.3%
>>    - Shoreline, Washington: +6.4%
>>    - Windsor, Ontario: +7%
>>    - Mercer Island, Washington: +7.8%
>>    - Woodinville, Washington: +8.7%
>>
>> Many of these are either in locations/climates that are prime for tree
>> growth or are prairie developments where new housing adds trees that were
>> never there. In many other cities, especially in eastern North America,
>> growth in cities often involves clearing trees and declines in canopy
>> cover. Washington, D.C. is a great example of canopy growth due to
>> extensive local planning and planting efforts.
>>
>> <https://www.planitgeo.com/>
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>>
>>
>>
>>
>> Jeremy Cantor
>>
>> Director
>>
>> Geospatial Services
>>
>>
>> M: 970.648.0630
>>
>> P: 303.214.5067
>>
>>
>> On Fri, Dec 13, 2019 at 9:15 AM Ian Hanou <ianhanou at planitgeo.com> wrote:
>>
>>> Great question Grace. We've led 25-30 projects involving canopy cover
>>> change analysis. Projects tend to use imagery collected 5 to 10yrs apart
>>> between acquisition dates. Our study for Mississauga is the first one that
>>> comes to mind. They expected a loss in canopy due to EAB and the 2013 (?)
>>> ice storm, but had a 3-4% gain b/w 2007 and 2014. We used satellite imagery
>>> and object-based imaging (remote sensing) including a rigorous accuracy
>>> assessment protocol, and then secondarily used i-Tree Canopy to 1% SE or
>>> better. This approach validated the change (i.e. increase / gain) by using
>>> both methods by getting results within .5-1% of each other.
>>>
>>> Another factor of course is location and climate. I'm based in Denver
>>> where development generally adds canopy cover over time b/c it was
>>> naturally prairie before, similar to Calgary and Saskatoon. When we
>>> analyzed Milwaukee canopy cover on a study in 2015 working w/Dr. Rich
>>> Hauer, we used imagery from every decade starting in 1956 to present time
>>> and showed a gain in canopy (except when DED hit) b/c it was so agrarian
>>> before and canopy was quite low in the 1950's there.
>>>
>>> We've certainly had other projects in temperate climates result in
>>> moderate canopy increases ... Washington D.C., Kirkland, Washington, Salem,
>>> Oregon, etc. Loss is easier to detect whereas gains are more subtle,
>>> especially with shorter periods of time b/w assessments. I don't recall our
>>> results off-hand for a 2nd canopy study with Cambridge, Ontario last year
>>> but have cc'd Jeremy who can respond to that and possibly provide others.
>>> Jeremy is also working with Urban Forest Innovations on a study with
>>> Windsor, Ontario which includes canopy cover change so those results will
>>> be available in 2020.
>>>
>>> This presentation
>>> <https://www.trees.org.uk/Trees.org.uk/media/Trees-org.uk/Documents/Conference19/MonAM-2-Cecil-Konijnendijk.pdf>
>>> from Cecil Konijnendijk might be useful as well.
>>>
>>> Last note, at the 2018 Canadian UF Conference / IUFC we presented a
>>> poster on canopy change analysis (called "Liar, Liar, Your Maps on Fire").
>>> I'd be happy to dig up and send it to you.
>>>
>>> Happy to discuss further anytime -
>>> Ian
>>>
>>> On Fri, Dec 13, 2019 at 7:16 AM Grace Golightly via CANUFNET <
>>> canufnet at list.web.net> wrote:
>>>
>>>> Do you know of any cities (anywhere) that have managed to increase
>>>> their tree canopy?
>>>>
>>>> I understand that Oakville, ON has, and perhaps Melbourne, Australia.
>>>>
>>>> Do you know of any others? I would appreciate hearing about them.
>>>>
>>>> Many thanks,
>>>> Grace Golightly
>>>>
>>>
>>>
>>> --
>>>
>>>
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>>>
>>>
>>>
>>>
>>> Ian Hanou
>>>
>>> CEO and Founder
>>>
>>>
>>> M: 303.503.4846
>>>
>>> P: 303.214.5067
>>>
>>>
>>>
>>>
>>>
>>
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