# Grid 2D Representation and Grid 2D Set Representation

**URL:** <https://discourse.f2i-consulting.com/t/grid-2d-representation-and-grid-2d-set-representation/126>\
**Category:** FESAPI\
**Created:** [February 12, 2019, 5:51pm UTC](https://discourse.f2i-consulting.com/t/grid-2d-representation-and-grid-2d-set-representation/126 "2019-02-12T17:51:29Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![untereiner](https://discourse.f2i-consulting.com/user_avatar/discourse.f2i-consulting.com/untereiner/32/26_2.png) [@untereiner](https://discourse.f2i-consulting.com/u/untereiner)\
**Post date:** [February 12, 2019, 5:51pm UTC](https://discourse.f2i-consulting.com/t/grid-2d-representation-and-grid-2d-set-representation/126/1 "2019-02-12T17:51:30Z")

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Hi !

I do not understand how these representations work.  
When I use I/J Origin and Offset functions to reconstruct my dataset, I have a lot of Nan in the table of z values.  
Is it possible that my grid has a lot of “non enabled” faces/points (as an IJKGrid) ?  
It is possible to get rid of these “non enabled” cells ?

What is a SupportingRepresentation ? (I do not understand the [doc](http://docs.energistics.org/#RESQML/RESQML_TOPICS/RESQML-000-220-0-C-sv2010.html))  
Have all 2d grids a supporting representation ?

Thanks in advance

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**Author:** ![philippeVerney](https://discourse.f2i-consulting.com/user_avatar/discourse.f2i-consulting.com/philippeverney/32/29_2.png) [@philippeVerney](https://discourse.f2i-consulting.com/u/philippeVerney)\
**Post date:** [February 12, 2019, 6:31pm UTC](https://discourse.f2i-consulting.com/t/grid-2d-representation-and-grid-2d-set-representation/126/2 "2019-02-12T18:31:29Z")

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Hi Lionel,

- Grid 2D Set Representation is deprecated (at least in fesapi and resqml 2.2, it no more exists). This is the only easy answer

> [@untereiner](#):
>
> Is it possible that my grid has a lot of “non enabled” faces/points (as an IJKGrid) ?

Yes it is possible. Most of time, RESQML is flexible. You can imagine that you can get whatever someone wants to represent.

> [@untereiner](#):
>
> It is possible to get rid of these “non enabled” cells ?

I tend to think “yes” iff they follow a regular pattern. Otherwise no.

> [@untereiner](#):
>
> What is a SupportingRepresentation ?

Mainly, this is the description of the i and j dimensions of your 2d grid. This is not the Z values. Indeed, the Z values are defined in the (non supporting) representation.

> [@untereiner](#):
>
> Have all 2d grids a supporting representation ?

No. Again : Most of time, RESQML is flexible. You can imagine that you can get whatever someone wants to represent.  
Most of time yes because grid 2d representations wants to share a common definition of i and j dimensions : they just want to differ from their Z values.