Boundary Strings Interactive
The Boundary Strings process will run automatically, provided that the DTMs/wireframes are selected in the display.
If you have not already selected them, you will prompted to do so by the Selection Assistant. Select the DTM/wireframe objects and click on the Accept Selection button (or right-click):
Alternatively, you can Digitise the required object/s using the button in the Selection Assistant toolbar. The Selection Assistant will close, providing access to the tools used to create the object.
If a Strings layer is not the active layer, you will be prompted to select the active layer:
A String file of the boundaries of the selected DTMs or wireframes is created: