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I'm wondering if it is possible to combine a LiDAR generated DTM on a 1m Scale with a Hillshade DTM on a 0,25m Scale to improve the level of detail of the LiDAR DTM. If possible how can this be done in QGIS?

Here are two samples:

1m LiDAR DTM enter image description here

0,25m Hillshade DTM enter image description here

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    Not really, as a hillshade is not a DTM (it contains no elevation values). You can overlay them (put hillshade on top and set opacity to 50%) or you can display the lidar DTM as a hillshade (QGIS layer properties, symbology, render type = hillshade). You could also have the lidar DTM in the map twice, first with hillshade symbology and 50% opacity and 2nd as elevation with a nice elevation colour ramp.
    – user2856
    Commented Jun 12 at 23:05
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    You can overlay the rasters with the DEM on top with blending mode Multiply to get this effect
    – Bera
    Commented Jun 13 at 5:24

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