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                  ■ 12d Model sample case 
                   
 
Measuring the terrain of the lake bottom at intervals, coloring the sediments
(or the deep place), and displaying it on the bottom terrain. 
                   
                  
                    
                      
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                        -Green mesh | 
                        : | 
                        Terrain of shore and bottom | 
                       
                      
                         | 
                        -Blue area | 
                        : | 
                        Areas where sediments are piled up. 
Well-colored place shows more deposits. | 
                       
                      
                         | 
                        -Red area | 
                        : | 
                        Areas where sand is scraped. 
The deeper the color is, the more sand is scraped. | 
                       
                    
                   
 
The places to be colored are determined from the difference between the
terrain created from the previous result and that created from the current
result. | 
                 
              
             
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