I have two raster DEMs in same resolution I want to bring together. I was using the merge-function in SAGA, GRASS and QGIS but I always get the following result:
Where could the fault be?
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You should first mosaik the map tiles, then perform the reprojection. This will avoid the gaps unless they already exist in the original data.
Not enough rep to comment but I believe markusN is refering to running:
gdalbuildvrt OUTPUT.img.vrt DEM_1 DEM_2 DEM_N
FWIW, this is what I do in my workflow to avoid visible seams at tile boundaries.