I would experiment with the update column command (Table > Update column).
Choose the table to update as being the polygon table,
the table to get the data from as the site coverage;
the join criteria as being where the object in the polygon table contains
the object of the sites table (accessed by the join button),
the column to update as "Add a temporary column" and
the values as (Calculate) sum of the number of sitings of a species.
Then just do a dot density thematic on the
This processure does not change the data in your tables, but adds a
temporary column that is reproduced if you save a workspace. Thus change
the data in sites and the next time you open your workspace, it will show
the changes automatically.
You can also do this from thematic mapping by choosing
Then just do a dot density thematic on the polygon table, choose the option
join for the column in step 2, and choose the sites tables and sum the
number of values etc. as above.
Hope this helps
Robert
-----Original Message-----
From: Lavinia Irving [SMTP:[EMAIL PROTECTED]]
Sent: Wednesday, February 09, 2000 1:04 AM
To: [EMAIL PROTECTED]
Subject: MI Help needed for Ecological problem
I need to locate multiple data items into a single polygon. Mapinfo will
only allow a single data item to occupy a single polygon using create
thematic map. I want my data to exist in a polygon as a dot denstiy of
individual pieces of data. The data is butterfly recorded sightings at a
number of different sites where each species needs to be represented within
each polygon, representing site, in order to make the dataset useful. Can
someone help me with this?
<< File: ATT00006.htm >>
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