Of course Mi loves mixed bags. The segregation of different object types in
different layers cannot be justified by MI capability of handling and
displaying them, by far. But I have found 3 reasons to promote segregation.
It may have something to do with the non-graphic part of the table: most
often, different object types correspond to different realities that are
best described by different variables. Forcing every object type to carry
exactly the same set of variables may be counter-productive and segregation
would be justified.
Do not forget that mixed bags will have some constraints on possible
treatment based on object information. e.g. updating a column with the area
of the objects can be done on sets of closed objects only, if not kaboom.
But this can be avoided by updating selections containing only the right
objects.
Finally, segregation is the only way to control effectively the visibility
of overlapping objects (given the fact that MI display order cannot be
controlled), but it might not be based on type only; smaller closed objects
might be on a higher layer than larger closed objects that would occult
them.
Jacques PARIS
e-mail [EMAIL PROTECTED]
For MapInfo support, see the Paris PC Consult enr. site at
http://www.total.net/~rparis/gisproducts.htm
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On
Behalf Of CDR Group
Sent: September 15, 2000 8:25 AM
To: [EMAIL PROTECTED]; Michel Larue
Subject: Re: MI Creating points
Michel
I was interested in your comment that mixing polygons and points
in the same table is not either a good idea, and is even forbidden in
Arcview.
A major factor in choosing Mapinfo for us, was that it DOES have the
flexibility
to store points, lines, polygons and text objects in the same database....
AND to have a variety of symbols, linestyles and fills to depict 'types' of
record.
Hopefully, Gilbert has a solution to his 'create points' problem by now.
Perhaps you could comment or discuss with other listers on this issue??.
Regards
John Ievers
Fuel starved in the UK
(Petrol blockades just lifting now - for those not aware!!)
-----Original Message-----
From: Michel Larue <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
Date: 15 September 2000 13:03
Subject: Re: MI Creating points
>Dear Gilbert,
>
>It is because MapInfo can have only one object attached to one record, and
>the object is already there, it is your polyon. In fact mixing polygons and
>points is not either a good idea, and is even forbidden in Arcview. So I
>suggest that you save a copy of your polygon table with another name, open
>this table, update your columns with centroidX and centroidY, remove the
>polygons and create points.
>
>Have Fun
>
>Michel Larue
>
>At 11:51 14/09/00 -0400, you wrote:
>>Could someone help me with the Create points command from the Table menu?
>>
>>I have a polygon table which is editable, I created 2 new columns in the
>>associated browser that I filled with the X and Y coordinates of the
>>polygon's centroid. Then I'm using the Create points command to get that
>>central point feature for each polygon. I get no error message, but no
>>points either. Why this?
>>
>>_________________________________________
>>
>>Yves Gilbert
>>Agent de recherche/Research Officer
>>
>>
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