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I have 2 rasters. The first one is a lidar which is clipped by a masked layer. (30.53mb, pixel size=1m,float32)

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The other is a local survey GEOTIFF. (75kb, pixel size=1m,float32)

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When I merge them, QGIS makes a "box" with no data values. This is the command:

GDAL command: gdal_merge.bat -a_nodata 0.0 -ot Float32 -of GTiff -o C:/Users/DELL/AppData/Local/Temp/processing_mciOFb/1182dffdfdad4287b941faacdf067b43/OUTPUT.tif --optfile C:/Users/DELL/AppData/Local/Temp/processing_mciOFb/268a4fe4705745a6817ebfd45e67ff3b/mergeInputFiles.txt

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What am I missing?

I have done these things for many times and my first time to experience this.

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The smaller raster was an output from the Raster Calculator and was not showing the correct extents (showing only positive results). The Raster Calculator produced a box/rectangular raster (including negative results).

This is the reason why there is a box when I merged the two rasters as it included the areas with negative values.

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