I've found a number of references on Mapinfo-L to both of my questions but
not an exact answer.
1. I have a table of line objects (2 node lines not polylines). The lines
represent the movement of a storm centre. In most cases, the lines have a
length but occasionally, the start and end points are the same... storm is
stationary. I am doing an SQL 'intersects' query that attempts to find all
lines that touch or move into a closed region.
Select * from LineTable, RegionTable where LineTable.Obj intersects
RegionTable.Obj into Selection
The selection works well and gives the desired results most of the time.
However, occasionally a few stray lines from outside the region are included
in the selection... in all cases, those lines are the zero length ones. I
have tried changing those lines to points... the selection will correctly
exclude the points. Is there a problem here with the zero-length line and
Mapinfo 5.0?
2. Can one change the centroids of the lines above from the centre of the
line to the start? I would like the autolabels to lie at the beginning of
the lines.
Thankyou
Lorne
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