## DEM Preview Tool ##
The DEM preview tool mainly checks the constructed TIN by constructing a temporary DEM of the local point cloud.Activate the section editing module, click "Start Editing" in the menu bar, and this function is available after "TIN" is generated.

#### Usage ####
(1) Click "DEM Preview" in the menu bar, a dialog box will pop up:

<div align=center>
<img src="../../ScreenShot/en/Profile/DEMPreview.png" alt="trajectory" style='margin-left:24%;'/>
</div>

(2) Draw a polygon in the section window or TIN window, double-click the mouse button to end the drawing; right click to cancel and redraw. After double-clicking, the DEM will be displayed overlaid with the point cloud.

###### Parameter Settings ######
- **Scale (default 1:500)**: Supports four large scales from 1:500 to 1:5000.
- **Grid size (meters) (default "2")**: The resolution at which the DEM is generated.

| Scale   | Grid Size |
|:-------:|:---------:|
| 1:500   | 0.5       |
| 1:1000  | 1         |
| 1:2000  | 2         |