Try the Fuzz tool from the list.
Define and draw a distance dependant function that'll enable you to qualify
objects around your point(s).
Define one or more new columns in in your target(household) objects table.
Apply the distance function to this table, from your points location table.
The target table is now qualified in terms of shortest distance (straight
flight of course) from the nearest point. Use standard SQL to order your
target table from this qualified field, select fields while summing your
demographic variable (I know MI doesn't provide a running sum function, but
you still have trial and error method)
Note that you can define a differential function too, that could similarly
qualify your target's objects with social/income/proximity of collective
transport/proximity of a road, etc ... You could even add an angular
function to qualify in function of the location (if North South
transportation is globally easier than East West for example...) but it may
be overkill ...
The other way is to buy Vertical Mapper, that'll do a huff based analisys,
with powerfull tools and visualisation;
Last way is to work with MI buffers, but it's pretty difficult when dealing
with multiple points if your demographic table isn't regular and evenly
distributed in space, you may have weird results in this latter case. It
certainly is depending on what you're after ...
Eric.
-----Message d'origine-----
De: Kent Hargesheimer [SMTP:[EMAIL PROTECTED]]
Date: jeudi 16 septembre 1999 19:54
A: MapInfo-L
Objet: MI MapBasic Demographic Buffering Tool
Listers-
I have a retail client in need of a tool that will draw a buffer around a
point or set of points to capture a specified count of a demographic
variable (such as 100,000 people or households).
Does anyone have a MapBasic tool that does this?
Thanks,
Kent Hargesheimer
Senior Consultant
SRC - Extending the Reach of Micromarketing
603 Chadfield Way N.E.
Leesburg, VA 20176-4823
Tel 703.737.7739 Fax 703.737.7719
Website: http://www.extendthereach.com
SRC in Action: http://www.demographicsnow.com
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