> I have run into a strange problem where sometimes if the moon is just
right
> and there is a pending deadline, layers don't display correctly. If I
open
> a simple map where the land, rivers and coastline are the only layers
being
> used, the coastline would normally be coincidental with the edge of the
> land (as one would hope). However, in a complex workspace that has taken
> FOREVER to build those exact same layers are screwed up and the coast line
> is offset from the edge of the land. Why? Plz help.
When layers that should line up on't line up, it is often due to their being
in
different projections *based upon different datums*. When layers line up in
some maps but not in others, it is usually due to the fact that the
intrinsic
projection of one of the layers is based upon a spherical Earth (i.e. not
based
upon any datum).
MapInfo treats layers using a spherical Earth differently: When mixed with
any *one* other layer based upon a datum, it pretends the first layer is the
other datum. Things line up with no problem.
When mixed with *more than one* other datum, MapInfo has to choose one of
the datums upon which to pretend to base the spherical layer.
So, I would guess that one or two of the three layers you mention is based
on
a spherical Earth, and the others are based upon a datum, and the projection
of your Map window based upon a different datum.
Another possibility is that the Map window's projection is spherical and
your three layers' projections are based upon two or more datums.
Hope this helps
Spencer
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