Elliot Tinton <[EMAIL PROTECTED]> wrote:
> Hello List,
>
> I would like to be able to create a thematic map of different individual
> symbols based on a column of numbers and at the same time create
> another thematic map of different sized symbols based on another
> column of numbers. i.e. I want to plot circles or crosses depending
> on one column and I want to plot the circles/crosses big or small
> depending on another column. Is it possible to do these two things
> together ? I can do them both seperately but can't overlay the two maps
> as one obscures the other.
You can do this in plain old MapInfo fairly easily.
1. Make sure that the table you are basing this thematic map on
is in the MapWindow only ONCE (this isn't strictly necessary but
reduces confusion while you're adding the two thematic layers).
2. Next, create the circles/crosses thematic layer, the way you
normally would.
3. Finally, start creating the thematic layer based on the data you
want to vary the symbols' size by, but stop when you get to step 3.
This MUST be a "ranges" thematic map.
3a. In the Step 3 dialog box, click on the "styles.." button in the upper
right area of the dialog box. You will get the Styles dialog.
3b. You will notice a button in the lower part of the Styles dialog that
is labeled either "Options >>" or "Options <<".
If it's labeled "Options >>", click on it and the dialog box will widen
showing more controls. If it's labeled "Options <<" the other controls
are already there.
3c. One of these other controls is a group of radio buttons titled "Apply".
Your choices are "All Attributes", "Color", and "Size". If you choose
"Size", the point-size attributes for this thematic layer will be applied
to the theme layer below it. The rest of the symbol attributes wil be
ignored.
You wil probably also want to choose "size" in the gorup of radio
buttons titled "Auto Spread" (whose choices are "Color", "Size",
and "None").
Hope this helps
Spencer
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