It appears to be the same as this functionality in Business Analyst<br><br><a href="http://www.esri.com/software/arcgis/extensions/businessanalyst/about/customer-market.html">http://www.esri.com/software/arcgis/extensions/businessanalyst/about/customer-market.html
</a><br><br>I thought this was done using some older version of Arcview, but i'm not very familiar with esri's offerings.<br><br>Will<br><br><div><span class="gmail_quote">On 7/5/06, <b class="gmail_sendername">Paul Ramsey
</b> <<a href="mailto:pramsey@refractions.net">pramsey@refractions.net</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
This wouldn't be in vanilla arcview, was it in Network Analyst? The top<br>80% of points by drive distance might yield this shape. Finding the<br>points would be straightforward, and then the hull building would be the<br>
hand-waving part.<br><br>P<br><br>William Andersen wrote:<br>> Paul, Steve,<br>><br>> Thanks for the quick replies, unfortunately it's pretty hard to tell<br>> from those images if they match.<br>><br>> I've done some more digging and it turns out that these shapes were
<br>> created in Arcview 3.x. The notes I have say...<br>><br>> > This approach selects a number of the outliers and joins the extreme<br>> points using elliptical arcs.<br>> > The arcs are all created in a direction moving out from the store.
<br>><br>> However, I dont see customer points at the discontinuities in the hulls,<br>> so it appears that the "extreme points" are perhaps interpolated.<br>><br>><br>> Will<br>><br>> On 7/5/06, *Paul Ramsey* <
<a href="mailto:pramsey@refractions.net">pramsey@refractions.net</a><br>> <mailto:<a href="mailto:pramsey@refractions.net">pramsey@refractions.net</a>>> wrote:<br>><br>> William,<br>><br>> It doesn't look like this is a standard algorithm, but more likely a
<br>> particular empirical technique provided by the particular software you<br>> were using. So substituting some other technique might yield a<br>> different shape entirely... do any of the techniques mentioned here
<br>> <<a href="http://www.geospatial-online.com/geospatialsolutions/article/articleDetail.jsp?id=1348">http://www.geospatial-online.com/geospatialsolutions/article/articleDetail.jsp?id=1348</a><br>> <
<a href="http://www.geospatial-online.com/geospatialsolutions/article/articleDetail.jsp?id=1348">http://www.geospatial-online.com/geospatialsolutions/article/articleDetail.jsp?id=1348</a>>><br>> sound like what was done to your data?
<br>><br>> Paul<br>><br>> William Andersen wrote:<br>> ><br>> > I'm fairly new to postgis, and working to automate a number of<br>> > processes.<br>> ><br>> > We are trying to compute market area polygons that look like the
<br>> > attached image. These were created by some older software.<br>> ><br>> ><br>> > They are referred to as Amoeba Hulls, and they contain 80% of a<br>> > store's customers. However I can't find any solid documentation that
<br>> > would allow me to reproduce them.<br>> ><br>> > Does anyone have any ideas how these shapes are created or an<br>> > alternate name that I might be able to google? Additionally, we may
<br>> > be in a position to finance the development of this feature.<br>> ><br>> _______________________________________________<br>> postgis-users mailing list<br>> <a href="mailto:postgis-users@postgis.refractions.net">
postgis-users@postgis.refractions.net</a><br>> <mailto:<a href="mailto:postgis-users@postgis.refractions.net">postgis-users@postgis.refractions.net</a>><br>> <a href="http://postgis.refractions.net/mailman/listinfo/postgis-users">
http://postgis.refractions.net/mailman/listinfo/postgis-users</a><br>><br>><br>><br>> ------------------------------------------------------------------------<br>><br>> _______________________________________________
<br>> postgis-users mailing list<br>> <a href="mailto:postgis-users@postgis.refractions.net">postgis-users@postgis.refractions.net</a><br>> <a href="http://postgis.refractions.net/mailman/listinfo/postgis-users">
http://postgis.refractions.net/mailman/listinfo/postgis-users</a><br><br>_______________________________________________<br>postgis-users mailing list<br><a href="mailto:postgis-users@postgis.refractions.net">postgis-users@postgis.refractions.net
</a><br><a href="http://postgis.refractions.net/mailman/listinfo/postgis-users">http://postgis.refractions.net/mailman/listinfo/postgis-users</a><br></blockquote></div><br>