2DA V2.0                                                        
                                                                
           Corner1   Edge     Corner2   Height   Model          
0          sand      ****     sand      0        trd21_0000_1   
1          sand      ****     ****      0        trd21_0000_1    
2          chasm     ****     chasm     0        trd21_a08_01   
3          chasm     ****     sand      0        ztrd21_c02_01