# Model defined on edges or faces?

**URL:** <https://simpeg.discourse.group/t/model-defined-on-edges-or-faces/354>\
**Category:** Getting Started\
**Created:** [August 25, 2022, 5:10pm UTC](https://simpeg.discourse.group/t/model-defined-on-edges-or-faces/354 "2022-08-25T17:10:28Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![1apsus](https://avatars.discourse-cdn.com/v4/letter/1/b5ac83/32.png) [@1apsus](https://simpeg.discourse.group/u/1apsus)\
**Post date:** [August 25, 2022, 5:10pm UTC](https://simpeg.discourse.group/t/model-defined-on-edges-or-faces/354/1 "2022-08-25T17:10:28Z")

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Hello,

As far as I understood from SimPEG and geophysics inverse problem, the model are always scalar field built on cell centers (or nodes).  
Could it be possible to use the SimPEG framework with a model defined on edges or faces ?  
I didn’t manage to make it work so far…

Thank you guys !! 🤠