RE: [MI-L] How to find the "Centre-of-Gravity" of a Region

[Jakob Lanstorp]

>>Besides, why is such a placement of the centroid better than the default   If you have a odd shaped object you might want to display the label within the largest area of that object.                                         -----------------                                       |                | |--------------------------------------                | |--------------------------------------                |                                       |                |                                       ----------------- The "ASCII" object above will have a centroid in the 'pipe' and not in center of the largest area. One way of calculating the new centroid is by use of Vertical Mapper descriped by Russell Lawley: http://lists.directionsmag.com/discussion/read.php?f=7&i=41713&t=41285 I have used it as an exercise in a VM class and it always ends up in a big mess....... >>Stephen, you do not state your reason for recalculating the centroid.   /Jakob From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Lars I. Nielsen (GisPro) Sent: Saturday, October 14, 2006 5:24 PM To: Marsh, Stephen Cc: mapinfo-l@lists.directionsmag.com Subject: Re: [MI-L] How to find the "Centre-of-Gravity" of a Region Hi Stephen, MapInfo's centroid is not just the center of the MBR. Correct centroids also need to appear inside a region object. So a "center of gravity / mass" calculation may not yield a correct centroid placement, but one that's outside the region, which may lead to problems when using the data in MapInfo. Just think of a circular donut, where the center of mass will lie in the middle of the spoke hole, i.e. outside the ring region. Besides, why is such a placement of the centroid better than the default ? Best regards / Med venlig hilsen Lars I. Nielsen GisPro Marsh, Stephen wrote: HI All,   Does anybody know how to find the “Centre-of-Gravity” of a region using MapInfo? The centriod location is based on the ‘Minimum Bounds Rectangle’ approach, so the centriod location is not the centre-of-gravity of the region. Also, the centriod can be moved for presentation purposes etc. This means that the coordinate extractor tool does not work for my purposes.   Any help in this matter will be greatly appreciated!!   Many thanks,   Stephen   ========================================================= NOTICE - This communication may contain confidential and privileged information that is for the sole use of the intended recipient. Any viewing, copying or distribution of, or reliance on this message by unintended recipients is strictly prohibited. If you have received this message in error, please notify us immediately by replying to the message and deleting it from your computer. ========================================================= _______________________________________________ MapInfo-L mailing list MapInfo-L@lists.directionsmag.com http://www.directionsmag.com/mailman/listinfo/mapinfo-l

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