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I am trying to georeference an image base on another *.tif, after rectifying i still have my Image as unknown spatial reference.

Does somebody know how I can fix it?

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    @Martin - That's a legit answer. Please make this comment an answer.
    – Jakub Sisak GeoGraphics
    Commented Nov 27, 2014 at 14:09
  • So, found it. Define projection is in Arctoolbox.
    – Bahar.B
    Commented Nov 27, 2014 at 14:57

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Georeferencing is a process where you define which coordinates your image covers. It'll write in the coordinate system of the data frame. Therefore, it does not specify which coordinate system you use, only which coordinates it covers.

The tool Define projection (under Data Management --> Projections and transformations) can be used on both vector and raster files to specify the coordinate system it is already in.

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