Hi Erin,
try to use Voronoi polygons instead of convex hull (provided that the number of points is not too high).
Then you can use our RegMan (region manager, TRIAL version available for download from www.terris.sk).
The RegMan's "Dissolve module" (check also Split module) can be used to join neigbouring regions based on a common item. In contrast to MapInfo Combine objects using Column function, it joins only neigbouring regions and thus bypasses the necessity to disintegrate the joined regions afterwards.
If you don't need this, just make a query for "number 1" and use MI's function combine. Similarly you have to do this also for "number 2".
Finally, if you need only convex hull region you can cut voronoi regions with convex hull one.
Another solution, provided that your grid points are regularly distributed (matrix of the points and number of the points is high), you can use Grid Analyser "Point to grid" function (be sure to input correct minimum bounding coordinates and grid cell size!!!). Then through GA's "Export module" export this grid into MI's table regions. Then follow above mentioned way how to merge regions with same value.
Hope, it helps you. If any problem occurs and/or need more help and information, please mail be back.
Regards Stefan Majtan
************************************************************************** TERRIS GIS Applications Development Grid Analyser - raster GIS for native MapInfo grid
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On Wed, 16 Jun 2004 09:34:13 -0400, Erin Rubio <[EMAIL PROTECTED]> wrote:
Hi, All,
I have a grid of points that cover the extents of a polygon. Based on a number (1 or 2) I've assigned to each point, I'd like to split the underlying polygon into 2 regions. (Note: all of the 1s are on one side and all of the 2s are on another, so there'll be no overlap. I hope.)
I was thinking of using convex hull to create polygons around my 2 sets of points, and using them to split the underlying polygon, but it seems there will always be a gap left between the two convex hulls.
Is there a way I can split this polygon with no gaps?
(I could make small celled grid across the area, assign my 1s and 2s to the cells and do it that way, but the process takes too long for my needs, since some of the polygons are large and I need the cells small enough to avoid having the split look pixelated...)
Thanks in advance for your help, Erin Rubio
Spatial Insights, Inc. 7635 Leesburg Pike, Falls Church, VA 22043 tel: 703.891.1008 fax: 703.891.1007 sales: 800.347.5291 www.spatialinsights.com [EMAIL PROTECTED]
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