It was my understanding that vector coverages in different projections can
be mixed willy-nilly, technically speaking, within a map window, and each
would be reprojected on-the-fly to that windows projection as defined by the
raster base projection. In a discussion with technical support at a company
that supplies several MI add-ons, I was told I was mistaken. Rather, that
on-the-fly projection only correctly occurs if the various vectors are all
in lat/long. What? That makes on-the-fly projection a very limited
feature, indeed. The User's Guide only indicates on-the-fly reprojection to
be a problem in processing time, not in mapping.
Your clarification of this point will be greatly appreciated.
Drew
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Andrew Phillips, Ph.D.
Quaternary Geology Section
Illinois State Geological Survey
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