Have a look at demofuzz on directionsmag ftp site. * define a set of 'origin' points * define a set of 'target' points * define a distance function graphically (let say a ramp from 0 to 50 km, then zero; or a gate function from 0 to 50 km , depending on your needs) * if you need orientation from 'origin' points, define an angular function, like a ramp from 0 to 360 ? * apply both functions simultaneously * to find clusters, apply a gate distance function (mean clusters radius to be defined) defining 'origin' and 'target' points as your whole set of points (or only those 'gated' at 50 km in the previous step.
Not this straightforward, but fun and unusual tool to use ... Eric. > -----Message d'origine----- > De : jelena puzic [mailto:[EMAIL PROTECTED]] > Envoye : mercredi 1 mai 2002 05:49 > A : [EMAIL PROTECTED] > Objet : MI-L Cor. 50 km clusters of point data > > > > Sorry about that - the message wasn't attached in the previous email. > > Hello Group Does anyone have an elegant way to find "clusters" of > point data within a certain distance buffer zone? I have a point > table and wish to highlight all points within 50km of any other > point in the same table. I have seen some solutions to this > involving two tables...(the table could be copied here...) > > Thank you so much - your help is very much appreciated. > > JP > > > > --------------------------------- > Post your ad for FREE! Yahoo! Canada Personals > --------------------------------------------------------------------- List hosting provided by Directions Magazine | www.directionsmag.com | To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
