I have a directory with 370 tifs. I just found out that a few, an unknown number, have the projection undefined, but they draw aligned with the know projection tifs, so no mystery there. I thought I could loop through a list of tifs in the folder and set the definition on the files missing, similar to https://community.esri.com/thread/13078 but wondered if I should add an "if" to check if the image is one of the ones with projection undefined. But what would be that test? Do you think the test would speed up execution or not?