# Grid files
In the ICON world there are two grid file generators, one by DWD (described in the ICON tutorial) that produces Icosahedral grids. Those grids are published here: [DWD grids](http://icon-downloads.mpimet.mpg.de/dwd_grids.xml)

And one by MPI-M ([code](https://gitlab.dkrz.de/mpim-sw/grid-generator) ) which produces icosahedral and torus grid files. Those grids (icosahedron) are published here: [MPI-M grids](http://icon-downloads.mpimet.mpg.de/mpim_grids.xml)

The produced grid files have a couple of differences which range from different attributes to different units of some fields and are listed below;

| Field, attribute | DWD (sphere) | MPI-M (sphere) | MPI-M (Torus) | remark |
|:------------------------------------ |:-------------- |:-------------- | ------------- | ---------------- |
| dimensions:cell_delauney | y | missing | | not used in ICON |
| dimensions:vert_delauney | y | missing | | not used in ICON |
| dimensions: max_stored_decomposition | missing | y | | |
| variables: cell_are | unit:steradian | unit: m2 | | |
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