Maptitude - http://research.umbc.edu/~roswell/maptitude.html

Hi Marjorie and all:

Marjorie, I thought since we discussed some important topics that
might be of general interest I should summarize them and write them
to the list:

  Can't set a break point in a manual theme: True in a sense, but then
you can't really set anything automatic about a manual theme -- the
point of a manual theme is that you set everything manually.  One
strategy that might help you is to use the Theme Wizard to create a
basic theme that is close to what you want, then go back into the Theme
Wizard, click on the "Manual" button, and adjust the classes to better
suit your needs.

  Saving Themes: As discussed, there currently isn't a way to
manage themes in the way you're describing i.e copy them from one
map to another, one database to another, saving and restoring
them.  However, in your case there's a neat trick you can employ.
You have a county layer with eight or so fields of similar data
with similar ranges and distribution, and you want to make eight or
so separate maps, one for each field, each showing a color-theme
of one of the fields.  There's a way you can do this without
manually creating the same theme setting eight times.

  1. Create a Formula Field, and name it something generic, like
     "Color-Theme Field."

  2. Assume the eight fields you want to separately color-theme
     are called, creatively, "Field_1", "Field_2", "Field_3", etc.
     Enter as the Formula for the Formula Field simply:

      Field_1

     This will basically duplicate Field_1 under the name of the
     Formula Field "Color-Theme Field."

  3. Use the Color-Theme Wizard to create a color theme on the Formula
     Field "Color-Theme Field."

  4. Use the Save-As command to save 7 copies of your original map
     with your painstakingly created color-theme.

  5. Open up the second map copy and edit the Formula Field such that
     the formula is:

     Field_2

     instead of the original "Field_1".  This effectively replaces the
     contents of "Color-Theme Field" with the contents of Field_2

Repeat step 5 for the remaining copies.  In this way, the theme has
effectively been copied eight times to eight different maps, each on a 
different field.

-Philip Villars


Philip Villars             (617) 527-4700 / 5113 FAX
Manager of Technical Support Services
Caliper Corporation
1172 Beacon St.
Newton MA  02461

www: www.caliper.com
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