Maptitude - http://research.umbc.edu/~roswell/maptitude.html
Hello all,
Let me first rephrase what Peter was explaining, that there are two
ways of creating the dot-density for a field such as Population:
1. Create a number of dots based on the overall value of Population
in all areas, and spread the dots "fairly" over the entire map; or
2. For each area, create a number of dots corresponding to the
Population field for that area.
Maptitude uses method 1, MapInfo uses method 2. The problem with
method 2 is that the overall number of dots on the map can end up
being far off from the total population. As Lois pointed out, the
problem with method 1 is that a dot can appear in an area that by
itself doesn't meet the criteria for a dot.
You can argue for using one method or the other. I've been under
the impression that method 1 was implemented in Maptitude based on
cartographic principles, although I'll admit that this is not my
speciality.
If you really want to use method 2, there is an easy way to do this
with Maptitude, using formula fields:
Say you want one dot for every 1,000 people. Create a formula
field with the formula
r2i(Population / 1000)
Then create the dot-density theme using this field. Make sure you
select to do the dots "Manually at 1".
-Kjartan
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