Sorry, Agustin and list, I lost Agustin's e-mail address.
> I have two lists:
> - list A are polylines (land cover boundaries)
> - list B are points (codes for the land cover characteristics, these
points
> are located in the same position as the centroids of polylines from list
A)
>
> I nee to select the polylines from attributes in the points list. I was
> using SQL, selecting the B.obj's that contain A.obj's with the desired
> attributes. The results: no element was selected. I believe no elements
were
> returned because polylines are "open" and not contain anything.
Is there anything that prevents you from converting polylines into regions?
If nothing stand in the way, convert polylines into regions and your SQL
will work.
Besides, in MapInfo, polylines have no centroid , only closed objects have
one. How can you then say that they are in the same positions as the points?
If your land cover regions are bounded by a set of polylines, that most
polylines are common boundaries for adjacent regions, then you would have to
structure your map as a set of regions before you can use calls addressing
regions (like in A.obj).
Hoping it helps.
Jacques Paris
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gis activity (MapInfo mainly)
http://www.total.net/~rparis/gisproducts.htm
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