> Is there any way to create a thematic map with greater than 230
> values to
> shade?? A map I need to shade has 242 separate values and I
> cant see anyway
> to shade it with simplification.
Nope. No way with plain MapInfo Thematic Layers. This is a
hard-coded limit built into the Thematic mapping. I think it is
also related to the MapInfo limit of 240-or-so colors in a map
window.
The way to get around it is to use a combination of patterns and
colors. With 10 fill patterns and 230 colors, you get 2300
distinct combinations (but they get really hard to distinguish
and you will start violating common sense cartographic
principles). You can do this with Thematic mapping, but you have
to somehow break your single themes into multiple categories and
make one theme layer with patterns and the other with colors, and
show them together. This will make for a tricky legend too.
The other (better, but harder) way is to create a table of
look-up styles, and make as many as you like, using whatever
colors (up to 240 or so) and patterns. Assign the same code to
these that you will use for your "theme", and then update the pen
and brush styles in your actual table with those of the look-up
table. You'll need to use some MapBasic functions to do the
update, so take a look at the MapBasic Reference in your 5.0
manaul, or get Jacques Paris' excellent little guide to the
MapBasic window. This technique makes permanent style changes,
but it's very effective.
- Bill Thoen
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