ArcGIS Pro 3.4 API Reference Guide
ArcGIS.Core.Data.Analyst3D Namespace / TinDataset Class / GetDataArea Method
Example Version

GetDataArea Method
Gets the data area of the TIN as a Z-aware polygon. This method must be called on the MCT. Use QueuedTask.Run.
Syntax
public Polygon GetDataArea()

Return Value

Exceptions
ExceptionDescription
A geodatabase-related exception has occurred.
This method or property must be called within the lambda passed to QueuedTask.Run
Remarks
The data area is defined as the boundary between those triangles that are marked as 'inside' and those marked as 'outside'. It is the same thing as the interpolation zone. The returned polygon is topologically simplified. This is done to ensure everything about the polygon is valid. A consequence is that some vertices may have been moved (snapped) slightly and therefore do not exactly match the corresponding TIN node positions.
Example
Get Data Area
var dataArea = tinDataset.GetDataArea();
Requirements

Target Platforms: Windows 11, Windows 10

ArcGIS Pro version: 3.2 or higher.
See Also