I've been having a strange problem with jagged edges appearing on the limb of Europa after the reprojection stage. This only happens in the image with the reseaus nulled out -- the mask image, which I'm propagating through the steps, does not show this behavior. This is documented in the images below.
The first image, below, is the input .calr2 image. This image has had the reseaus found and nulled out. It's also had spicelab, trim (5 pixels), voycal, wmatch, and jigsaw performed on it, and it's been tvdoctored to remove bad pixels.
The second image, below, is the result when the .calr2 image is run through planorth and geom to reproject it. The isis command used was planorth from=bl3.calr2 tfile=tfile.dat km=1.5 clat=-20 clon=132.2 then geom from=bl3.calr2 to=bl3.orth
Notice that strange jagged edges have appeared on the limb.
The third image, below, is the input masking image to the reprojection step. This image has had minimal processing -- it's had spicelab, findrx, and trim (5 pixels) run on it. The reseaus in this image have been located, but not nulled out.
The fourth image, below, is the result when the image above is reprojected using the same tfile as the first image. Note that the jagged edges do not result from this reprojection.
What's going on? My only theory at this point is that the nulled-out reseau on the limb in the first image above has somehow been propagated through by the reprojection process, and this has resulted in the jagged edges apparent in the second image above. Suggestions are welcome.