A DTM folder is needed to process data with MAJA to match the geographical extent of the corresponding L1C input product. When using startmaja, the creation of the folder in Maja-format is automatically attempted. For this the repRAW and repGSW directories in your folders.txt file need to be set.
If you wish to prepare the DTM prior to launch startmaja (eg. for network access constraints), you may use the dtmcreation tool:
TODO: add an example here