Entering Control Points

[Anna Bee]

I am trying to register a roster image and when I add my control
points and click ok I get a message that says

"control points are in a straight line. Enter control points that are
more spread out."

I have points in all four corners and a few scattered in the middle.
What am I doing wrong?

[Spencer Simpson]

Set the projection (using the Projection... button) before you enter any
control points.
________________________________

Spencer

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[Anna Bee]

Thank you for your help on that. I went back and changed my
projection and I do not get the message about my points being linear
but now I am having the same problem as I have when I don't register
the image. I can not get it to show up with any of my layers. Do you
have a quick fix for this? The book does not go into detail about all
of this.

Anna

On Apr 12, 11:48 am, "Spencer Simpson" <ssimp...@baltometro.org>
wrote:

[geomatics.ch]

Hi Anna,
did you check that in the layer control your raster is listed? Is
there a black or pink checkmark?
If the checkmark is black, try and right click in the map window and
Display all layers, to see if the projection and georeferencing are
correct.
If the checkmark is pink, you need to uncheck the display within zoom
option.
Let me know if it still doesn't work.
Isabella

[Spencer Simpson]

Isabella (Geomatics) answered this in a non-reply, but maybe a little more
explanation is necessary.

When you add a raster table to a map, MapInfo automatically sets the zoom
layering to some zoom range it calculates as 'reasonable'. The darn thing
always seems to insist on setting a zoom layering range that the map's
current zoom is outside of, meaning you can't see the image layer right
after you add it.

Go in to Layer Control and verify that the image table appears in the list
of layers. If the layer is currently hidden because of zoom layering, there
will be a pink checkbox. Double click on the layer name and uncheck the
"Display within zoom range" checkbox, or increase the max value to something
useful.

You can always "Zoom to layer" the image layer. If your control points'
coordinates are out of whack with respect to the projection, The image layer
will appear in one part of the world (add WORLD.TAB and look in the Atlantic
Ocean off the Niger delta), and the rest of your map layer will appear in
another (i.e. your zoom will be thousands of miles).