8. Interactively digitize areas of interest within the image pair, which are used to extract DTMs. Exclusion areas, such as lakes and buildings, can also be defined. This is an optional step. By default, the software uses the overlap area for each image pair defined as the area of interest for the output DTM.
9. Define the DTM extraction strategy parameters for the areas of interest. The strategy parameters govern the operation of the automatic DTM extraction process. This is an optional step. If you do not define your own parameters, the software uses the default strategy parameters.