Hi Bill,
> I have two raster images which are both in WGS84, Zone 36S. One Landsat,
> the other an air photo.
I suppose you registered them on that projection manually.
Have you rectified both of them? In case you got pre-rectified raster
images (such as orthophoto images), you have no problem. Please be sure
every raw aerial photo is distorted.
You have to rectify each raster image on the projection when you overlay
more than two layers.
> When you overlay them (in the same Mapper Window) they appear to be
> compatible, but if you digitize in the cosmetic layer to get a shape
> outline, and then remove one of the layers/images you get a shift, such that
> there is no near coincidence.
I experienced exactly the same before when I was comparing time series
of aerial photos of being eroded shorelines. I digitized shorelines but
it was useless. Please prepare a rectification program. I bought an
add-on of MapInfo Pro, called "Rastools" from Tennessee USA. You can
know the detail of it at
http://home.earthlink.net/~maptools/maptools.html
Regards,
Hiko
Kazuhiko Yamashita
Fukuoka, Japan
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