I have a stream segment for which I am trying to find a buffer around with criteria as 5m of elevation. So for each straight line within a stream segment, I have found buffer (polygon) for it. Now I need to merge this buffers in such a way that they form a continuous single polygon i.e. without any gaps and overlaps between them. Is there any way in QGIS or any python code to achieve the same?

Stream Segment with buffer

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In the Processing toolbox u have a treatment called "buffer" u can try

Tick then the checkbox "dissolve result" and u will get one buffer only.

If your starting point was a line layer, the buffer(s) you're showing don't look like usual buffers (too angulous to be real buffer imho ...)

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