# Value Error: pixel sizes are not equivalent - Carbon Model

**URL:** <https://community.naturalcapitalalliance.org/t/value-error-pixel-sizes-are-not-equivalent-carbon-model/2361>\
**Category:** Software Support\
**Tags:** carbon\
**Created:** [December 6, 2021, 8:43am UTC](https://community.naturalcapitalalliance.org/t/value-error-pixel-sizes-are-not-equivalent-carbon-model/2361 "2021-12-06T08:43:10Z")\
**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:** [December 6, 2021, 2:52pm UTC](https://community.naturalcapitalalliance.org/t/value-error-pixel-sizes-are-not-equivalent-carbon-model/2361/2 "2021-12-06T14:52:27Z")

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Hi @jorge , thanks for posting this issue.

It seems the Carbon model requires all the input rasters to be well-aligned with each other: they must all have the same pixel cell size and extent. You can do some pre-processing in GIS to ensure this. For example, in QGIS you can do this from the `Raster > Align Rasters` tool.

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