Left-click to add the polygon vertex. double- click to finish the selection. Right-click to Back One Point or Clear Selection before finish. Unlike Polygon Selection tool, you cannot select an area that exceeds the data range.

Left-click to start the Lasso Selection, move to add one point, and double-click to finish the selection. Right-click to Back One Point or Clear Selection before finish. Unlike Lasso Selection tool, you cannot select an area that exceeds the data range.

Left-click to add the polygon vertex. double- click to finish the selection. Right-click to Back One Point or Clear Selection before finish. You can select the area that exceeds the data range.

Draw closed areas interactively with the mouse, set parameters, and click the Add button to complete the addition. - **Elevation of Selected Points**: Project the selected area onto the same elevation plane. Users can manually input or activate the selection button to pick points in the scene for elevation settings. The default is the elevation of the last drawn point. - **Minimum Elevation**: Set the elevation of pixels within the range to the elevation corresponding to the lowest point. ### Linear Breakline ###

Draw a polyline interactively with the mouse, set parameters, and click the Add button to complete the addition.

• Change Elevation: Default is unchecked. Whether to change the elevation of the points along the line.
  • Starting Elevation: Define the starting elevation value. Users can manually input or activate the selection button to pick points in the scene for elevation settings.
  • Ending Elevation: Define the ending elevation value. Users can manually input or activate the selection button to pick points in the scene for elevation settings.

Breaklines of Gradual River

Draw two riverbanks interactively with the mouse, set parameters, and click the Add button to complete the addition.

• Starting Elevation: Define the starting elevation value of the river. The default is the elevation of the starting point of the second riverbank. Users can manually input or activate the selection button to pick points in the scene for elevation settings.
• Ending Elevation: Define the ending elevation value of the river. The default is the elevation of the endpoint of the second riverbank. Users can manually input or activate the selection button to pick points in the scene for elevation settings.

Shp Selection

For a specific range, the existing 2D SHP format vector file can be imported, and the polygon is identified by the software as the editing area.

Flatten Height

Click this button, or right-click to select Flatten Height. You can set elevations for selected area range models to specified elevation values for rivers or waters that have the same altitude.

• Flatten Height(meter): Set the elevation value. The default value is the average of the elevation values of the vertices of the selected region.

The schematic diagram is as follows, the left image is the original data, and the right image is the edited version.

Smooth Height

Click this button, or right-click to select Smooth Height, which can smooth the selected area range model. Using image mean smoothing to process the model in the selected region point by point, it is suitable for smoothing DEM to generate smooth contour lines.

• Kernel Size (default value is "5"): The size of the mean filter kernel, it can only be odd.

The schematic diagram is shown below. The left figure shows the original data, and the right figure shows the effect after editing.

Repair No Data

Click this button, or right-click to select Repair No Data. Use bilinear interpolation to calculate the elevation value of NO Data values in the area.

The schematic diagram is shown below. The left figure shows the original data, and the right figure shows the effect after editing.

Repair Height by Variance

Click this button, or right-click to select Repair Height by Variance. It is used to repair the noise caused by noise, according to the variance of its elevation value with the neighborhood point to determine whether it is a noise. Bilinear interpolation is used to calculate the elevation of the noise point.

• Elevation Variance Threshold(the default value is 10): The elevation variance threshold is used to determine whether it is a noise.

The schematic diagram is shown below. The left figure shows the original data, and the right figure shows the effect after editing.

Repair Height

Click this button, or right-click to select Repair Height. It is used to repair the elevation in the specified range. The bilinear interpolation method is used to calculate the elevation of the parameter conditions.

• Grid point type: This parameter defines the range of grid point to be processed and may constrain the processing scope.
  • All grids(default): All selected areas will be repaired.
  • Elevation Range: Only grids with elevation values within the minimum and maximum values are repaired. The default values for the maximum and minimum values are the maximum and minimum elevation values for the vertices of the selected area.
  • Internal No Data Value: Only the non-valued areas are repaired.

The schematic diagram is shown below. The left figure shows the original data, and the right figure shows the effect after editing.

Delete Height

Click this button, or right-click to select Delete Height. Delete the selected point elevation point.

Save DEM

Save the edited result to LiModel file.

Cancel DEM

Cancel editing, discard edit result, reload original file to display.

Exit

Click the exit button in the toolbar to exit LiModel editor. If the editing result is not saved, and click the Exit button or click the Edit button to finish the editing of the menu, the software will pop up the prompt window as shown below. Click Yes to save the editing result and exit. Click No to exit without saving the editing result. Click Cancel returns.