I did not find a straight answer such as the double thematic on regions
combining patterns and colors. I found two work-arounds each one with its
own draw back.
1 - a/ make a "color" thematic with "name" using a circle as a symbol.
b/ make a "size" thematic with "canopy" using a tramsparent circle as
symbol.
note: make sure that the size corresponding to the smallest canopy is not
smaller than the colored symbol.
2 - a/ convert points to circles of sizes proportionate to canopy radius. In
the MapBasic Window write and run
set coordsys table your_table
set distance units "unit_used_in_canopy"
update your_table set obj=createcircle(centroidx(obj),centroidy(obj),size)
b/ make a color thematic of these objects.
note: you may find safer to work on a copy of your original table.
I would love to hear there is a "better" way for doing it.
Jacques Paris
e-mail alternate
[EMAIL PROTECTED] [EMAIL PROTECTED]
paris PC Consult (mainly MapInfo app.)
www.total.net/~rparis/gisproducts.htm
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of Gabor Vasarhelyi
Sent: June 4, 2000 10:42 PM
To: '[EMAIL PROTECTED]'
Subject: MI Thematic mapping by name and numerical value
Dear listers,
I wish to thematically map trees by their scientific name and by their
canopy radius.
Currently the data is in the form of circles representing trees. All of
these are uniform in radius.
These have a name and canopy radius fields. When I attempt to colour by
species (individual thematic) and size by radius(using graduated thematic)
I only get the size changing but the colours don't. They do but I can't
merge the two variables.
Any ideas?
Can I resize the existing circles by the canopy field permanently?
And then colour them in a later process.
Cheers and thanks
Gabor Vasarhelyi
Environmental Resources Management Australia (ERM) Pty Ltd
Ph. 9906 1666
Fax 9906 5375
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