I'm willing to go out on a limb here...
My guess as to why Mapinfo rotates the vectors rather than the raster is
is based on two things:
1) Computational - it would be more resource intensive to rotate rasters
for the purposes of display. We'd really miss the ability to display
100mb of raster info quickly.
2) Raster Data Integrity - presumably(eek) your Raster data is oriented
to the north, an ortho photo or satellite image would to my
knowledge be oriented to the north. A raster drawing tool can be
used to approximate this.
I use non-earth projections as much as any MI user, and the assumption
in #2 annoys me as much as anyone. MI has chosen not to allow for
rotated Map Windows (or claims that the affine statement in the
projection definition allows for them), probably because of the
computational overhead.
Moral of the Story : Rate Rotatable Map Windows high on Steve Wallace's
MI Wish List voting that is coming soon!
Colin Anderson
______________________________ Reply Separator _________________________________
Subject: RE: MI Adding raster image rotates map!
Author: [EMAIL PROTECTED] (David Baker) at INTERNET
Date: 5/17/1999 9:30 PM
On 17 May 99, at 18:31, Perry Chris wrote:
> MapInfo skews and rotates vectors (lines, points, polygons) to match
> registered images.
Does this seem backwards to anyone else? Most people are going to have good
vector information, but
less people are going to have "good" raster information - there is always going
to be some angular error in
aerial photography, or stretch or skew in scanned images, so it's very unlikely
the raster data will be
"better" than the vector data....
Thanks for the pointers from people regarding software that works the correct
way - I'll check them out.
Hopefully future versions of MapInfo (if I can afford them) will allow my maps
to stay where they are without
trying to rotate them!
Dave
--
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| David Baker | [EMAIL PROTECTED] |
| Electronics Engineer | Kuala Lumpur, Malaysia |
|----------------------------------------------------|
| http://www.geocities.com/SiliconValley/Vista/8552/ |
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