Maptitude - http://research.umbc.edu/~roswell/maptitude.html
Thanks you, what a simple solution.
Louis
> -----Original Message-----
> From: Kjartan Stefansson [SMTP:[EMAIL PROTECTED]]
> Sent: Tuesday, March 27, 2001 6:38 PM
> To: [EMAIL PROTECTED]
> Subject: Re: [Maptitude] Dot Density Bug????
>
> 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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