SrfViewshedShowRegion Values
| 
                                                     Enumeration  | 
                                                
                                                     Value  | 
                                                
                                                     Description  | 
                                            
| 
                                                     srfViewshedShowRegionHidden  | 
                                                
                                                     0  | 
                                                
                                                     Viewshed fill is applied to invisible regions  | 
                                            
| 
                                                     srfViewshedShowRegionVisible  | 
                                                
                                                     1  | 
                                                
                                                     Viewshed fill is applied to visible regions  |