https://community.esri.com/t5/geoprocessing-questions/raster-projection-defined-but-unknown-geographic/m-p/1022513#M25132 <P>When trying to mosaic two rasters, I noticed one had a projection but an unknown datum and therefore couldn't be mosaicked to the other. I attempted to define projection to what it should be and it definitely was not correct. Now, no matter what I do, I can't seem to define the correct projection and have it show up in the right place, and is now not even show ing up at all. Is there a way to fix this issue without having to recreate all of the rasters from scratch?</P> Tue, 02 Feb 2021 13:37:05 GMT KathleenHoenke 2021-02-02T13:37:05Z https://community.esri.com/t5/geoprocessing-questions/raster-projection-defined-but-unknown-geographic/m-p/1022513#M25132 <P>When trying to mosaic two rasters, I noticed one had a projection but an unknown datum and therefore couldn't be mosaicked to the other. I attempted to define projection to what it should be and it definitely was not correct. Now, no matter what I do, I can't seem to define the correct projection and have it show up in the right place, and is now not even show ing up at all. Is there a way to fix this issue without having to recreate all of the rasters from scratch?</P> Tue, 02 Feb 2021 13:37:05 GMT https://community.esri.com/t5/geoprocessing-questions/raster-projection-defined-but-unknown-geographic/m-p/1022513#M25132 KathleenHoenke 2021-02-02T13:37:05Z https://community.esri.com/t5/geoprocessing-questions/raster-projection-defined-but-unknown-geographic/m-p/1022541#M25133 <P>You have to define it back to what it was.</P><P>If the file was a *.tif, you could try deleting/renaming any file with the same name but different extension to (eg a *.tfw, *aux etc)</P> Tue, 02 Feb 2021 14:52:56 GMT https://community.esri.com/t5/geoprocessing-questions/raster-projection-defined-but-unknown-geographic/m-p/1022541#M25133 DanPatterson 2021-02-02T14:52:56Z