DTM/DTM intersections

Task: Create an upper triangles surface of two DTMs

1. Click Reset graphics .
2. Open dump1.dtm in Graphics.
3. Open topo_dump1.dtm in Graphics.
4. Choose Surfaces > Clip or intersect DTMs > Upper triangles of 2 DTMs.
5. Enter the information as shown, and click Apply.



Note: The layer name cannot be the same as any of the current layers.

6. Follow the prompts highlighted on the Status bar.

Note: The image will be displayed in a different colour until the calculation function is deselected.

7. Press ESC.

The DTM is displayed.



8. Save the file as upper_surface.dtm.

Note: To see all of the steps performed in this task, run _11a_upper_triangles_of_2_dtms.tcl. You need to click Apply on any forms presented.

Task: Create a lower triangles surface of two DTMs

1. Click Reset graphics .
2. Open topo1.dtm in Graphics.
3. Open pit1.dtm in Graphics.
4. Choose Surfaces > Clip or intersect DTMs > Lower triangles of 2 DTMs.
5. Enter the information as shown, and click Apply.



6. Follow the prompts highlighted on the Status bar.

Note: The image will be displayed in a different colour while the function is running.

7. Press ESC.

The DTM with pit is displayed.



8. Save the file as lower_surface.dtm.

Note: To see all of the steps performed in this task, run _11b_lower_triangles_of_2DTMs.tcl. You need to click Apply on any forms presented.

Task: Create solid by intersecting two DTMs

1. Click Reset graphics .
2. Open topo1.dtm in Graphics.
3. Open pit1.dtm in Graphics.
4. Choose Surfaces > Clip or intersect DTMs > Create solid by intersecting 2 DTMs.
5. Enter the information as shown, and click Apply.



Note: The layer name cannot be the same as any of the current layers.

6. Follow the prompts highlighted on the Status bar.

Note: You must select the upper DTM (topography) first, followed by the lower DTM (pit). The image will be displayed in a different colour until the calculation function is deselected.

7. Press ESC.

The solid from the DTM intersection is displayed.



8. Save the file as pit_solid.dtm.
9. Choose Solids > Solids tools > Report volume of solids.
10. Enter the information as shown, and click Apply.



The solids object report log opens in your default text editor.

Note: To see all of the steps performed in this task, run _11c_create_solid_intersecting_2_dtms.tcl. You need to click Apply on any forms presented.