I was impressed with 5.5 when it overlayed 2 complex polygon sets that I
knew would have failed in previous versions, with the dreaded "regions too
complex" message. I fairly quickly discovered however that it still has its
limitations, beyond as certain point it still just fails. It doesn't give
you an error message, it just doesn't do anything.
You could try copying them both into a base table, and trying htere, rather
than in the cosmetic layer. I don't know if this will work, but I have
noticed the buffering function sometimes seems to be more successful if I
don't use the cosmetic layer, but rather save the results straight into a
table.
The only solution regarding complex datasets for me has been to work in
grids, and the speed at which Vertical Mapper can create grids, maipulate
them, and contour them back into vectors is impressive. Inevitably, some
resolution is lost.
If you want to work in vectors, it seems the only answer is to buy something
better than a desktop GIS.
On another matter, why would you want to hold the mouse button down over a
table in the layer control dialogue box and press esc at the same time
anyway? It's a shame that MI crashes when you do this, but I can't see
myself being too disadvantaged by this.
Regards
Peter Walsh
Dames & Moore
email: [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
Ph. +61 (2) 9955 7772
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> -----Original Message-----
> From: Humphrey, Ben [mailto:[EMAIL PROTECTED]]
> Sent: Friday, 20 August 1999 6:45
> To: '[EMAIL PROTECTED]'
> Subject: MI trouble combining complex polygons
>
>
> I have been attempting to combine complex polygons of
> telecommunications
> coverages using MapInfo 5.5 on a Win NT machine with 128 Mb RAM. The
> results of the combination procedures I have been trying
> (which usually take
> 1-2) hours are just a copy of one of the coverages I tried to
> combine. The
> methods I have been trying are:
>
> Combining from two separate layers-
> 1.Select the polygon in one layer, set as editable and as a target
> 2.Select the polygon in the other layer as click Objects>Combine
>
> Combining from one layer-
> 1.Copy polygons from both coverages to the cosmetic layer
> 2.Query>Select All from Cosmetic Layer
> 3.Objects>Combine
>
> To reiterate, the result is not the intended combination, but
> merely a copy
> of one of the two layers i tried to combine.
>
> Any suggestions?
>
> Ben Humphrey
> VoiceStream Wireless
> Tel 425-653-4605
>
>
>
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