photogrammetry
noun
                                                                                                                            
                                                            pho·to·gram·me·try
                    
                                                                                                              
                                                                                                                                  ˌfō-tə-ˈgra-mə-trē 
                                                      
                                                          
            
                                
              
          
                                                      : the science of making reliable measurements by the use of photographs and especially aerial photographs (as in surveying)                                      
                
                    
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  Merriam-Webster unabridged




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