I have a DEM of 5m pixel. I wonder is it okay to convert it to 2m pixel? How to do that using QGIS?
And what would happen to the original data, I mean the accuracy? Would it be reliable?
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You just right click the layer and choose
Export > Save As to do that in QGIS 3.x, define the extend as current layer extend and define resolution.
No problem resampling the image. But you can't increase the accuracy by increasing the resolution. Because the spatial resolution of the source DEM is 5m after all. In that case you just increase the number of pixels in the same area.