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[ugjka@ugjka tmp]$ sgpt "how are holes defined in geojson"
In GeoJSON, holes within polygons are defined using an array of linear rings. The first linear ring in the     
array represents the outer boundary of the polygon, and any subsequent linear rings represent holes within the 
polygon. Each linear ring is a closed line string that is defined by four or more positions, with the first and
last positions being equivalent.                                                                               

Here's an example of a GeoJSON polygon with a hole:                                                            

                                                                                                               
 {                                                                                                             
   "type": "Feature",                                                                                          
   "geometry": {                                                                                               
     "type": "Polygon",                                                                                        
     "coordinates": [                                                                                          
       [ // Outer boundary                                                                                     
         [100.0, 0.0],                                                                                         
         [101.0, 0.0],                                                                                         
         [101.0, 1.0],                                                                                         
         [100.0, 1.0],                                                                                         
         [100.0, 0.0]                                                                                          
       ],                                                                                                      
       [ // Hole                                                                                               
         [100.2, 0.2],                                                                                         
         [100.8, 0.2],                                                                                         
         [100.8, 0.8],                                                                                         
         [100.2, 0.8],                                                                                         
         [100.2, 0.2]                                                                                          
       ]                                                                                                       
     ]                                                                                                         
   },                                                                                                          
   "properties": {                                                                                             
     "name": "A polygon with a hole"                                                                           
   }                                                                                                           
 }                                                                                                             
                                                                                                               

In this example, the first array of coordinates defines the outer boundary of the polygon, and the second array
defines a hole within that polygon.