[CANUFNET] Cities that successfully increased tree canopy?

[Grace Golightly]

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.
>
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>
>
>
> Jeremy Cantor
>
> Director
>
> Geospatial Services
>
>
> M: 970.648.0630
>
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>
>
> 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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