> For the complete documentation index, see [llms.txt](https://docs.marpledata.com/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.marpledata.com/docs/marple-insight/user-manuals/analysis/dataset-modes/merge.md). # Merge If you have a recording that is split across multiple datasets, you can merge those datasets so that all of their signals are available together in a single dataset.

Data from weather station and flight instruments merged into one view

### Enable merge When you visualise multiple datasets, choose Merge in the dialog that pops up. You can also switch to Merge at any time from the Datasets dialog at the bottom left of your tab. In the signal list, you will now see the signals of all merged datasets together, grouped per dataset. ### Select which datasets to merge Open the Organise datasets dialog by clicking the Organise datasets button in the Datasets dialog, or by pressing the `i` key. In Merge mode, each dataset has a checkbox in front of it. Tick the datasets you want to include in the merge, or untick them to leave them out. Use the checkbox in the header to select or deselect all datasets at once. When multiple datasets contain a signal with the same name only the signal from the first dataset is kept. Consider using [Signal Aliasing](/docs/marple-db/datastreams/signal-aliasing.md) to prevent this.

### Align merged datasets * **First timestamp**: the original start time of the dataset. * **Auto-align:** automatically offset relative-time datasets so they line up with absolute-time datasets. * **Delta offset:** additional offset in seconds to shift a dataset earlier or later. You can use the distance between the two cursors to visually set this offset * **Result first timestamp:** the start time of the dataset after all offsets are applied. These controls help you make sure signals from different datasets are aligned in time before visualising them.