I have used the Distance Calculator in MI Pro v7.8 and that gave the correct closest store location. But I'm wanting to assign some 58,000 customers to the closest store. The number of customers will vary depending on how many customers fall within that particular voronoi polygon, which is anywhere from zero and up.
The whole problem seems to be the voronoi for each store is not representing an area closest to that store for some reason. I'm creating voronoi polygons from over 15,000 points. Could that be the cause of the problem? Has anyone else had any similar problems? Thanks, Bob Peter Horsbøll Møller <[EMAIL PROTECTED]> on Wednesday, January 11, 2006 at 2:22 PM -0700 wrote: >Bob, > >That sounds kind of strange. The voronoi for each store should represent >the area closer to each store than to any other store - just as you >expect. >And therefore each customer should be within that voronoi that also >contains the store they are closest to. > >Have you tried using the DistanceCalculator, that came with MapInfo 7.8 - >or even the improved one for MapInfo 8.0 ? This tool will give you the >nearest x stores for each customer. x can be 1, 2 or as many as like. So >this would be another way of getting the result, you are looking for. > >The tool from MapInfo 8.0 the result will be represented as a line >between the customer and the store. I'm not sure if this also is the case >with the 7.8 tool > >Peter Horsbøll Møller >GIS Developer, MTM >Geographical Information & IT > >COWI A/S >Odensevej 95 >DK-5260 Odense S. >Denmark > >Tel +45 6311 4900 >Direct +45 6311 4908 >Mob +45 5156 1045 >Fax +45 6311 4949 >E-mail [EMAIL PROTECTED] >http://www.cowi.dk/gis > >-----Original Message----- >From: [EMAIL PROTECTED] >[mailto:[EMAIL PROTECTED] On Behalf Of Robert >DeRubeis >Sent: Wednesday, January 11, 2006 5:58 PM >To: mapinfo-l@lists.directionsmag.com >Subject: [MI-L] voronoi polgon > >List, > >I have 2 point tables, stores and customers. I would like to find all >the customers that are the closest distance to a particular store so I >can assign information from the store to those customers. I created a >voronoi polygon from the store points, then did a select statement where >customer points are within store voronoi polygon. > >My problem is that I noticed in certain cases that some customer points >fell into a store voronoi polygon, but was actually closer to another >store. I measured the distance in MI Pro Ver 7.8 and it was not a big >difference (8.19 instead of 7.78 miles), but wondered why the inaccuracy? > >Thanks, >Bob > > >_______________________________________________ >MapInfo-L mailing list >MapInfo-L@lists.directionsmag.com >http://www.directionsmag.com/mailman/listinfo/mapinfo-l _______________________________________________ MapInfo-L mailing list MapInfo-L@lists.directionsmag.com http://www.directionsmag.com/mailman/listinfo/mapinfo-l
