Using this option, you can import a MapInfo TAB containing point locations, and calculate the viewsheds from the points specified.
- Select Multiple Points (.TAB) from the Viewshed Origin drop-down list.
- Click Browse and select the MapInfo TAB file containing points.
- Type the height of the viewpoint in the View Point Height field or type a constant value.
- Type the height of the object being viewed in the Terrain Offset field or type a constant value.
- Type the viewshed radius in the Viewing Radius field or type a constant value.
- Apply a suitable earth curvature correction to allow the scaling of the earth’s radius to the correct units. Select a correction from the Earth Curvature drop-down list. Refer to Viewshed Dialog Box for more details.
- Select the grid unit from the Units drop-down list.