Marcus,
Yes it can be done.
It is just a case of defining a custom Affine projection to represent your non-earth
data. Essentially this describes transformation
parameters to get from real earth coordinates to your local coordinate system. Your
non-earth coordinate values will be the same, but
everything will now also plot in the correct position on the earths surface and can be
overlayed with real earth data.
What you need are the Affine parameters a,b,c,d,e,f for:
X' = Ax+By+C
Y' = Dx+Ey+F
or
X' = Cos(theta)*x+Sin(Theta)*y+c
Y' = -Sin(theta)*x+Cos(Theta)*y+f
where theta is the angle of the coordinate system, C is the offset in the x direction
and F the offset in the Y direction.
These can be used in a custom projection (in this case based on Australian Map Grid
50, datum AGD84):
"My Affine Projection", 3008, 13, 7, 117, 0, 0.9996, 500000, 10000000, 7, A, B, C, D,
E, F, Bounds Clause
Or with real numbers:
"My Affine Projection", 3008, 13, 7, 117, 0, 0.9996, 500000, 10000000, 7,
0.780100691704, 0.619057142912, -5308307.365,
-0.619057142912, 0.780100691704, -5516110.998, 0, 0, 500000, 500000
To help with the parameters my Affine calculator should be of use. It is an ActiveX
component, so you will need to use MS Internet
Explorer and also set your security settings to low:
http://members.iinet.net.au/~mose/prod03.html
Let me know if you need any further help.
Regards
Neil Moseley
Geodata Computing Services
mailto:[EMAIL PROTECTED]
http://members.iinet.net.au/~mose/
> I need to be able to define a nonearth projection so that vector data defined in
> that projection can be used with vector data defined in real earth projections.
>
> I DO NOT want to convert all of my nonearth projection data to real earth
> projections, as the data needs to stay in nonearth co-ordinates. Neither do I
> want to convert all of my real earth projection data to the nonearth datum. I
> want to use MapInfo's capability to convert the vector files' projection on the
> fly.
>
> In spite of MapInfo saying this cannot be done, I have seen it being done. If
> any user knows how I would be very pleased to hear from you!
>
> Regards,
>
> Marcus Flis
> Exploration Manager,
> Iron Ore Company of Canada,
> PO Box 1000,
> Labrador City,
> Newfoundland-Labrador,
> Canada, A2V 2L8.
> ph: (709) 944 8819
> Fax: (709) 944 8779
> email: [EMAIL PROTECTED]
>
>
>
>
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