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I have two raster data. They must cover each other. My problem is, one of them doesen't have prj file, therefore I don't know what is the projection of this one. I can not cover this raster with the other one. Of course, I tried define projection function several times, but I don't know which projection should I use.

I use ArcMap 10.6.1

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Have you tried the Define Projection tool in ArcGIS? It doesn't modify anything to the original file, just updates the projection information!

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