| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 | 
                                    
                                    0%
                                 | 
| 1 | Earth | 960 | 
                                    
                                    80%
                                 | 
| 2 | Gravel | 72 | 
                                    
                                    6%
                                 | 
| 3 | Stone | 32 | 
                                    
                                    2.7%
                                 | 
| 4 | Muram | 0 | 
                                    
                                    0%
                                 | 
| 5 | Paved/ Tarred | 136 | 
                                    
                                    11.3%
                                 | 
| 6 | Concrete | 0 | 
                                    
                                    0%
                                 |