Raster image not matching spatial extent

Question

I'm trying to figure out why my raster image does not match its spatial extent. For example, the bottom-left corner of the image is supposed to be at (1033596, -526063) (see attachment "projection info"), but this point (green dot) does not line up with the bottom-left corner of the raster (see attachment "raster"). I've set the coordinate system of the data frame to that of the image (polar stereographic). Any help would be much appreciated.

projection info.png

raster.png

ScottStephenson · Answer

Ok, thanks Melita. I'll ask the creators of the data if they reprojected the image.

MelitaKennedy · Answer

Hmm, because of the rotation and jagged edges, it looks like it has been reprojected. Converting to polygon should lose the white area because it's probably no-data or 0 so not considered part of the polygon. It doesn't surprise me that the extents would be different.

Otherwise, I have no suggestions...but it is Friday at the end of a long week at almost 5pm.

ScottStephenson · Answer

If I understand you correctly, your suggestion might help diagnose the problem if I had projected the raster image from its original coordinate system. I haven't performed any projections on the image, so it's either in its original coordinate system, or it was projected by someone else before I received the image.

In attempting your solution, I noticed something interesting. I converted the image to polygon (raster to polygon, conversion toolbox), and the resulting polygon has the extent of the image as it is being displayed, rather than the extent shown in the image's source properties. Not sure if that sheds any light on the problem.