Selecting the DTM Extraction icon displays the DTM Extraction dialog. Selecting a cell within the DTM column of the LPS Project Manager CellArray also displays the DTM Extraction dialog if a DTM has not already been extracted. A third way to access the DTM Extraction option is from the Process menu. Color cells are used to identify completion of a process. A DTM cell element is green when a DTM exists and overlaps the corresponding reference image. A DTM cell element is red when a DTM does not exist or overlap for the corresponding reference image