# Grid Plane Surface
WARNING
GSA-Grasshopper plugin is pre-release and under active development, including further testing to be undertaken. It is provided "as-is" and you bear the risk of using it. Future versions may contain breaking changes. Any files, results, or other types of output information created using the plugin should not be relied upon without thorough and independent checking.
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# Description
A Grid Plane Surface is used by Grid Loads.
A grid plane defines the geometry of a surface, and the load behaviour of the grid plane is defined by a grid surface.
In Grasshopper, a Grid Plane Surface contains both the information of what in GSA is known as a Grid Plane and a Grid Surface
The Grasshopper plugin will automatically create a fitting Grid Plane Surface when using the Create Grid Point Load, Create Grid Line Load or Create Grid Area Load components.
Grid Plane Surfaces can also be created independently using the Create Grid Plane and Create Grid Surface components.
# Properties
 | Plane | Grid Plane | Grid Plane (Axis + Elevation) |
 | Integer | Grid Plane ID | Grid Plane ID |
 | Text | Grid Plane Name | Grid Plane Name |
 | Boolean | is Storey? | Grid Plane is Storey type |
| Plane | Axis | Grid Plane Axis as plane |
| Integer | Axis ID | Axis ID |
 | Unit Number Length | Elevation | Grid Plane Elevation |
| Unit Number Length | Grid Plane Tolerance Above | Grid Plane Tolerance Above (for Storey Type) |
| Unit Number Length | Grid Plane Tolerance Below | Grid Plane Tolerance Below (for Storey Type) |
| Integer | Grid Surface ID | Grid Surface ID |
| Text | Grid Surface Name | Grid Surface Name |
| Text | Elements | Elements that Grid Surface will try to expand load to |
| Text | Element Type | Grid Surface Element Type |
| Unit Number Length | Grid Surface Tolerance | Grid Surface Tolerance |
| Text | Span Type | Grid Surface Span Type |
 | Number | Span Direction | Grid Surface Span Direction |
| Text | Expansion Type | Grid Surface Expansion Type |
| Boolean | Simplified Tributary Area | Grid Surface Simplified Tributary Area |
Note: the above properties can be retrieved using the Grid Plane Surface Properties component