Actually, when you register an image, you are definining an affine transformation that
is applied to all of the
vector layers so they match up with the raster image. So, what you've experienced is
"correct", at least
according to the way MI Pro works. What I'd like to know is how MI Pro handles
multiple images with different
registrations, say for tiling purposes. It sure would make more sense for the
transformation to be applied to the
raster, not the vector layers.
Gary.
Gerald Kornelson wrote:
> I recently received an air photo of our entire city in .jpg format. It was rotated
>about 20 degrees off from
> tru north-south.
>
> I opened it in MI, registered it so that the error indicators seemed very close, and
>saved it.
>
> If I open it and any other MI table (ie. image as a "backdrop") the whole bunch is
>off by the same +/- 20
> degrees. The vector map is rotated to match the correct location on the raster
>instead of the
> raster being rotated into correct UTM coordinates. Doesn't matter which I open
>first, vector or raster.
> Isn't the first table supposed to control the projection of the map?
>
> I took the image into Photo Editor and rotated it about 20 degrees. It looks OK,
>but I cannot be sure
> that the actual rotation is correct.
>
> Isn't registering a raster supposed to "re-orient" the raster so it displays the
>raster pixels in the location
> that were assigned during the registration process?
>
> Any ideas?
>
> Gerald Kornelson
> City of Winnipeg
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