transform/georeference raster that already projects on the fly

[CatherynRyan]

Hello,

I'm working with Mars raster data; my basemaps are HiRISE and CTX raster images projected to Mars_Equirectangular (the standard used for Martian geomatics). I have a raster image imported from ENVI that already has all of its georeferencing included, so when it gets added to my map it projects on the fly. Problem is, it's a few (10s-100s) meters off from where it should be based on the HiRISE images below it. How can I transform or re-georeference it to the lower image?

[DanPatterson_Retired]

Normally one would reply with ... 'its a datum shift problem' ... but I doubt that applies in this case (unless it does!?!)

Alternately, is there some possibility that the extents are based on something else, like cell centers versus cell corners?  And of course this assumes that everything is indeed in the same coordinate system.