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I have been trying to use the mosaic tool in ArcMAP to merge several GeoTIFFs together, using BLEND as Mosaic Operator and LAST as Mosaic Colormap Mode. I placed all files that I want to merge in the same folder, and also copied the first one as a target file.

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That way, I had 8 folders that needed to be mosaiced. For the first two I had little issues, but with all other the program kept giving me an error message.

I tried various things, nothing worked.

How can I resolve this error?

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  • Do all the rasters has the same (number of bands and pixel depth)? please check this link
    – Moh
    Commented Apr 5, 2018 at 14:32
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    Yes, they all have the same number of bands and pixel depth. However, thank you for the link. I never used the "mosaic to new raster" - tool, only the "mosaic" - tool. I don't know what the difference is...
    – Djro33
    Commented Apr 5, 2018 at 14:46

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I think the issue is with the dash (-) in the target file name before the Copy.tif in ####_#### - Copy.tif. You need to change that to underscore (_).

Also as commented by User2009, you have another tool that enables you to mosaic to a new raster instead of an existing raster. However, you need to make sure that the pixel depth of the output mosaic raster data is similar to the input raster data.

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  • That was also something I thought initially, so I changed it. But it didn't work. And for the two folders where it did work, they also had a file with a "- Copy" in its name. But I will try out the other tool and see if it changes anything.
    – Djro33
    Commented Apr 6, 2018 at 10:30

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