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I can't run a Maximum Likelihood Classification because an Error 000885 says my input signature file does not have a file extension but it actually does as you can see in the picture.

What am I doing wrong?

enter image description here

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I'd try placing that .gsg file outside of the GDB. –  Paul Jul 24 at 20:12
    
Thanks Paul! It looks like that was the problem. –  Tiana Jul 24 at 20:43
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Rather than close this question I think we can turn it into a valuable Q&A for a common error message. –  PolyGeo Jul 24 at 22:07
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I think if @Paul turned that comment into an answer with a little expansion along the lines of file geodatabases are not folders to be used as such with regular files (I've seen people store mxds among other things in them) it would be a good Q&A. The root issue is what I believe to be a common misunderstanding that while Windows sees it as a folder, it really isn't an Arc doesn't see it the same way (rather as a database). –  Chris W Jul 24 at 22:13

1 Answer 1

up vote 7 down vote accepted

As troubleshot by @Paul, the error message is being triggered because you have placed your *.gsg file inside of a file geodatabase folder (*.gdb).

It seems like the Maximum Likelihood Classification tool is getting confused by this.

However, the error can be easily avoided by ensuring that your *.gsg file is NOT inside of a file geodatabase folder (*.gdb).

There may be many other situations where the same or similar errors can be triggered so some advice offered here by @ChrisW etc is that although a file geodatabase (*.gdb) is a Windows folder it is unwise to store anything that is not part of a file geodatabase inside of its folder.

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+1 and much better than the 2 lines I would have strung together. –  Paul Jul 24 at 22:20

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