# Urban Cooling\_ T air calculate error

**URL:** https://community.naturalcapitalalliance.org/t/urban-cooling-t-air-calculate-error/1815
**Category:** Software Support
**Tags:** urban-cooling
**Created:** [April 5, 2021, 3:51am UTC](https://community.naturalcapitalalliance.org/t/urban-cooling-t-air-calculate-error/1815 "2021-04-05T03:51:48Z")
**Posts on this page:** 1
**Showing post:** 2

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### Author: ![dave](https://yyz1.discourse-cdn.com/flex031/user_avatar/community.naturalcapitalalliance.org/dave/32/70_2.png) [@dave](https://community.naturalcapitalalliance.org/u/dave)
#### Post date: [April 5, 2021, 1:54pm UTC](https://community.naturalcapitalalliance.org/t/urban-cooling-t-air-calculate-error/1815/2 "2021-04-05T13:54:43Z")

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Hi @zhongan.wang , I think the same issue just came up over here [Urban Cooling \_ nan values (new) - #8 by dave](https://community.naturalcapitalalliance.org/t/urban-cooling-nan-values-new/1810/8)

> [@Urban Cooling \_ nan values (new)](https://community.naturalcapitalalliance.org/t/urban-cooling-nan-values-new/1810/8):
>
> I think the critical thing here is that the extent of the LULC extends beyond the Area of Interest by at least the distance of the “max blending distance”. When this is not the case, the nodata values from the edges of the LULC seem to creep deep into the AOI during the convolution steps. (This is evident in nodata appearing in `intermediate/T_air.tif` ). I think we may be able to improve the model’s behavior there, but for now you found a good workaround by using a larger LULC.

Do you think this is the same problem?

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_[View the full topic](https://community.naturalcapitalalliance.org/t/urban-cooling-t-air-calculate-error/1815)._