Maptitude - http://research.umbc.edu/~roswell/maptitude.html
Peter:
I believe that Louis' point is valid. While Maptitude
is trying to help by using the total aggregation as
a fair representation of the data, this does not
help the user on a more finite basis.
Perhaps there should be some basic dot density
theme which reflects the actual data value of each
individual area and not the total.
This will be a continual problem for our business. Can
you recommend any other solution. We really need
to use an actual dot density theme since based on
indiviudal values. We are using additional themes to
represent other data.
Anyone else had problem with this situation.
> -----Original Message-----
> From: Peter H. Van Demark [SMTP:[EMAIL PROTECTED]]
> Sent: Tuesday, March 27, 2001 5:10 PM
> To: Maptitude
> Subject: RE: [Maptitude] Dot Density Bug????
>
> Maptitude - http://research.umbc.edu/~roswell/maptitude.html
>
> Louis:
> >For my dot density map, I do not want Maptitude to take the total value
> to
> >determine the number of dots by the break point and then allow Maptitude
> to
> >allocate all of the points to the areas. Rather, I want a case by case
> dot
> >density map so a true representation of each individual area is shown,
> not
> >by the total area.
>
> Unless you have one dot=one unit, there has to be some rounding. The fewer
>
> units you have per dot, the easier it is to meet your requirements.
>
> >Also, based on allocating the dot density theme based on the total area,
> how
> >does the analyst interpret on a case-by-case
> >basis when viewing the actual placement of the dots (i.e., how is the
> actual
> >point placed based on the total value system). Is it based on centroid
> >weighting based on the value or how?
>
> Dots are placed randomly within the areas. You should not look at the
> placement of individual dots, but at the density of dots. If the map user
> starts counting dots, then a dot-density map is not the right method to
> present the data. Use another thematic mapping method, possibly along with
>
> labeling the areas with the count field.
>
> Peter
>
> ----------------------------------------------------------------
> Peter Van Demark
> Director of GIS Products and Training Phone: 617-527-4700
> Caliper Corporation Fax: 617-527-5113
> 1172 Beacon Street E-mail: [EMAIL PROTECTED]
> Newton MA 02461-9926 Web site: http://www.caliper.com
>
>
> ______________________________________________________________________
> To unsubscribe, write to [EMAIL PROTECTED]
______________________________________________________________________
To unsubscribe, write to [EMAIL PROTECTED]
