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When I import the .hgt srtm elevation data to QGIS, the each tiles(each .hgt files) stitches with with a break or contrast variance or something like this:

And it gets worst when rendering it with Qgis2threejs:

I tried it viewing with 3DEM, the data seems to be perfect in there. Please help me with this thing.

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    If you wan them to be view them as a single block you have either to build a virtual raster or merge them. The same goes for the variation in contrast – Gerardo Jimenez Nov 24 '16 at 18:43
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    Build a virtual raster - gis.stackexchange.com/q/177837/2856 – user2856 Nov 25 '16 at 3:04
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Apart from stitching the DEMs into a single file, you can apply the same styling to the SRTM files.

QGIS uses the 2% and 98% values of each tile for min and max (black and white) colour (or greyscale) interpolating, so each has a different colour ramp.

Applying the same style to all tiles will give you a contiguos look. You might have to expand min and max to cover all values.

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