Negative value in natural gas benefits and air quality benefits

[Stelios]

Hello, I am currently building Athenstreemap.gr for my city (Athens, Greece) as a thesis-project for my MSC (geoinformatics).
The site is in Greek, so it will be hard for you to understand it :P
When I choose statistics (above the map) I see that in some neighborhoods the value for natural gas benefits is negative.
Same for the air quality benefits, for fewer neighborhoods.
Why is this happening? I also see it in the resource summary models that it is negative.
Thanks,
Stelios Kalogridis

[Lee]

I'm not sure why you might be seeing such a relationship with air quality, but I have heard of such anomalies with energy use.

Specifically, in North America, it is well understood the right tree on the southwest side of your home can help reduce heating and cooling costs. However, if you were to plant an evergreen tree on the side of your house that receives full sun, you might be impeding the natural heating provided by the sun during the winter months. In this case, you might actually use more energy to heat your home in the winter, which could lead to negative values for the tree in this regard.

Whether or not this is common, well understood, or well documented, I'm not sure. Simply, I've seen the issue and this is how it's been explained in the past.

--
All the best,
Lee
ISA Certified Arborist MI-4148A
Registered Forester #46043

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[Stelios Kalogridis]

This is really strange though...

My region is Inland Valleys..

But how can it be possible for one itree gender to have for different DBH, for some negative and fore some positive value??
For example, in the Natural Gas Sheet, I see:

CEL OTHER

23,2

-12,7

-81,7

-36,0

98,8

218,4

302,9

349,5

330,1

Is there anything wrong with the Resource file??

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