Hi Oto, I have no idea what the Merge/Append column represents. The Geometry Source "order" is mentioned in the Descartes 2023 Help as follows: 3SM files can be composed of multiple sources of elevation and clip data. The order of the files in the list is important as the files are processed in order. So, if a certain area is to be clipped, then the clip definition should come after those data files. Regards, Ron
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