Using the Viewshed Tool - MapInfo_Pro_Advanced - 2023

To use the Viewshed Analysis tool:

1. On the RASTER tab, in the Operations group, click Raster Operations and then click Viewshed to open the Viewshed dialog box.
2. Select a grid file for viewshed analysis from the Input File field.
3. Select the required viewshed origin from the Viewshed Mode drop-down list. The Viewshed Mode is the location from which the line of sight is to be calculated. There are two options:
   • Single Point
   • Multiple Points (.TAB)
4. Click More Options and select the Use Sweep Azimuth check-box. This check-box is cleared by default. If you select it, the Sweep Azimuth and the Sweep Angle fields appear.
5. Select the Smooth check-box if you want to apply Gaussian smoothing filter to the resultant grid. Specify the width of the kernel to be used for Gaussian smoothing in the Filter Width field.
6. Select the viewshed classification from the Value Classification drop-down list.
7. Select the Use Complex Calculation check-box if you want to calculate either the height the cell should be raised to make it just visible from the viewpoint, or the height that the viewing points should be lowered in order to become just visible from the grid cell.
8. select the Null cells outside viewshed radii check-box if you want to set all cells outside viewpoint or tower maximum radius to null.
9. Select the Clip to viewshed radii bounds check-box if you want to clip the output raster to MBR of viewshed radii.
10. Select the Create Classified Raster check-box if you want to create a classified output raster.
11. In the Output field, select a location to save the output grid to.
12. Select the Display check-box to display the viewshed generated by a single or multiple point objects on the map window.
13. Click Process to start creating viewshed for a single or multiple points on the input grid.